Magnetic Zeolite Research Articles

A hierarchical porous Fe3O4-COOH@H-ZIF-67 composite as magnetic solid-phase extraction adsorbent for benzimidazole pesticides

A hierarchical porous structural magnetic zeolite imidazolate framework-67 composite (Fe3O4-COOH@H-ZIF-67) was prepared through directly mixing the H-ZIF-67 and glutaric anhydride functionalized Fe3O4 nanospheres, of which the H-ZIF-67 was synthesized through a double template pore size regulation method. The successful preparation of Fe3O4-COOH@H-ZIF-67 composite was confirmed based on the material characterization using different techniques. The prepared composite was applied in the efficient removal of four benzimidazole pesticides (BZDs) in water using magnetic solid-phase extraction (MSPE) process. The results of static and dynamic adsorption experiments indicate that the adsorption of BZDs on Fe3O4-COOH@H-ZIF-67 follow pseudo-second-order kinetics, the Langmuir model fitted well with the adsorption data (R2 are all higher than 0.9969), and the maximum adsorption capacity for BZDs are 7.44–31.11 mg/g. Meanwhile, the adsorption mechanism study indicate that both hydrogen bonding and coordination play important roles during the adsorption process of BZDs. Finally, the developed MSPE method was combined with HPLC analysis and applied in the removal of BZDs from simulated pesticides wastewater. The removal rate was 82.76–96.18 %, and the treated samples met the requirements of the maximum residue limits of CBZ in the national standard GB 21523–2008. In addition, the adsorbent can be used at least three times and the extraction efficiency changed within 3 % after being stored in dry atmosphere at room temperature for 90 days. The results of this work manifested that Fe3O4-COOH@H-ZIF-67 composite can be used for removal and analysis of BZDs in complex samples.

Design and characterisation of activated magnetic zeolite 4A from naturally occurring kaolin clay of Cameroonian origin for optimised dye removal by Fenton-like degradation

ABSTRACT The transformation of local clay material of Cameroonian origin into magnetic zeolite (Fe@Zeo-4A) for the degradation of acid-blue 90 in solution was investigate herein. The insertion of magnetic iron oxide particles into the zeolitic framework of Zeo-4A was achieved via hydrothermal synthesis. FT-IR spectroscopy, XRD and SEM confirmed the transformation of the clay into zeolite while EDX analysis and elemental mappings confirmed the presence of iron in the magnetic zeolite. Fe@Zeo-4A was strongly attracted to an external magnetic field. N2 adsorption-desorption studies revealed a considerable decrease in specific surface area and pore volume from the zeolite to the magnetic zeolite, suggesting the occupation of the pores of the zeolite by magnetite. The central composite design of the response surface methodology was used as optimisation approach for four parameters affecting the efficiency of degradation: solution pH, H2O2 concentration, initial dye concentration and time of stirring. ANOVA results revealed good correlation between the experimental and predicted results as well as the suitability of the linear regression model for describing the dye degradation process. An adjusted correlation coefficient of 85.17% was obtained for the dye degradation model. An optimal degradation percentage of 95.2% was obtained experimentally under optimal conditions of 7.6 for pH, 20 mg/L for dye concentration, 15.0 mol/L for [H2O2] and 15 min for time, in close agreement with a theoretical response of 96.6% predicted by the model. The magnetic zeolite was found to exhibit good stability over a wide pH range and lost only about 18% of its catalytic efficiency after five cycles of degradation experiments. Therefore, the novel magnetic zeolite-based material is an efficient Fenton catalyst for treating dye-contaminated wastewater.

Eco-friendly synthesis of magnetic zeolite A from red mud and coal gasification slag for the removal of Pb2+ and Cu2+

The issue of heavy metal pollutants has gained global attention, while the disposal of industrial wastes remains a critical environmental concern that requires urgent treatment. In this study, the successful synthesis of magnetic zeolite A (MZA) aimed at the Pb2+ and Cu2+ removal was accomplished by capitalizing on the synergetic interplay between the red mud (RM) and coal gasification slag (CGS) compositions. A reduction roasting reaction involving iron and carbon was innovatively integrated into the conventional alkali fusion-activation process of silicon-aluminum components. The physicochemical properties and preparation mechanism of MZA were characterized using various analytical techniques. Adsorption isotherms and kinetics were analyzed employing various well-known models, and the reusability of MZA was investigated. The result showed that hematite in RM was converted into magnetite and metallic iron during the alkali fusion-synchronous reduction roasting process, and the aluminosilicates from RM and CGS were transformed into zeolite A through a hydrothermal method. The Langmuir and pseudo-second order models well described the Pb2+ adsorption behavior, while the adsorption process of Cu2+ followed the Freundlich and Elovich models best. These results confirmed the successful synthesis of MZA with excellent adsorption performance and magnetic properties, thereby demonstrating the potential of RM and CGS in heavy metal removal through resource utilization.

Cytotoxicity and Genotoxicity Effects of a Magnetic Zeolite Composite in Daphnia magna (Straus, 1820).

Zeolite type 5A combined with the magnetic properties of maghemite nanoparticles facilitate the rapid absorption of heavy metals, which makes them an interesting proposal for the remediation of water contaminated with lead and arsenic. However, the physicochemical analysis related to concentration and size for the use of this magnetic zeolite composite (MZ0) in water bodies and the possible toxicological effects on aquatic fauna has not yet been carried out. The main objective of the research work is to determine lethal concentrations that cause damage to Daphnia magna based on LC50 tests, morphology, reproductive rate, and quantification of the expression of three genes closely involved in the morphological development of vital structures (Glass, NinaE, Pph13). To achieve this objective, populations of neonates and young individuals were used, and results showed that the LC50 for neonates was 11,314 mg L-1, while for young individuals, it was 0.0310 mg L-1. Damage to morphological development was evidenced by a decrease in eye size in neonates, an increase in eye size in young individuals, variations in the size of the caudal spine for both age groups, and slight increases in the heart size, body, and antenna for both age groups. The reproductive rate of neonates was not affected by the lower concentrations of MZ0, while in young individuals, the reproductive rate decreased by more than 50% from the minimum exposure concentration of MZ0. And for both ages, Glass gene expression levels decreased as the MZ0 concentration increased. Also, the MZ0 evidenced its affinity for the exoskeleton of D. magna, which was observed using both light microscopy and electron microscopy. It is concluded that MZ0 did not generate significant damage in the mortality, morphology, reproductive rate, or gene expression in D. magna at lower concentrations, demonstrating the importance of evaluating the possible impacts on different life stages of the cladoceran.

In-situ honeycomb spheres for enhanced enzyme immobilization and stability

This paper presents a promising heterogeneous biocatalyst-immobilized cellulase system, which can facilitate the targeted catalytic conversion of biomass to reducing sugars. Magnetic Zeolite Imidazole Framework-8/chitosan (Fe3O4/ZIF-8/CS, FZC) hybrid honeycomb microspheres were synthesized to immobilize cellulase using an in-situ growth strategy. The enhancement of immobilization efficiency induced by each constituent of the composite carrier was explored. This exploration was grounded in varying combinations of components within the honeycomb composite spheres, revealing the indispensability of ZIF-8. Through in-situ assembly, the composite material presents a microsphere with an internal honeycomb structure and multilevel pores. Effective immobilization, temperature-responsive conformational change, and cyclic stability were achieved due to the scaling effect of the channel, extensive specific surface area, and abundant amino group interactions enable immobilized enzymes to maintain excellent performance under challenging operating conditions, demonstrating an enhanced structure-performance relationship. With the obtained immobilized cellulase, we achieved a high load (461.67 mg/g) of cellulase and a significant reducing sugar yield (328.39 mg/g) from corncob waste. In addition, we investigated the enhancement effect of thermal activation on the immobilized enzyme activity of composite carrier. The results showed that the appropriate heat treatment was conducive to the activation of FZC immobilized enzyme with a reducing sugar yield 1.61 times higher than that of the control. The strategy provided in this study promotes the development of immobilized biocatalysts and provides a useful reference for the further design of biocatalytic systems.

Removal of Methyl Violet 2B and Direct Black 22 from Single and Binary System Using a Magnetic Zeolite/MgO/Starch/Fe3O4 Nanocomposite

This study focuses on the preparation and characterization of magnetic zeolite (FSM-Zeo) using starch, magnesium oxide, and Fe3O4. Various analyses, including BET, FTIR, SEM, EDS, XRD, Zeta potential, and VSM, were conducted to assess the properties of FSM-Zeo. The adsorption capacity of FSM-Zeo was investigated for methyl violet (MV-2B) and direct black 22 (DB-22) in both single and binary dye solutions. Key parameters such as adsorbent amount, initial dye concentration, contact time, temperature, initial pH, and ionic strength were examined in the single system. Kinetic and isotherm studies revealed that DB-22 and MV-2B adsorption followed the pseudo-second-order model. Moreover, Freundlich and Langmuir models were confirmed for MV-2B and DB-22 adsorption on FSM-Zeo, respectively. In the binary system, the presence of MV-2B enhanced the adsorption of DB-22, resulting in higher removal compared to the single dye solution. A synergistic effect was observed due to the interaction between DB-22 and MV-2B, promoting the adsorption of DB-22 on FSM-Zeo.

A novel and cost-effective synthesis of magnetic zeolite 4A using kaolinite and red mud for Sr(II) removal

A novel and cost-effective approach was successfully developed for synthesizing high-performance zeolite 4A encapsulating magnetic particles (magnetic zeolite 4A) using kaolinite and red mud as raw materials via one-step combined activation-reduction and subsequent hydrothermal synthesis. The concurrent reduction of iron compounds in red mud to magnetic particles mainly composed of Fe3O4 during the thermal activation of kaolinite eliminated the need for a distinct red mud reduction process, thereby streamlining the synthesis and maximizing efficiency. The resulting product comprised highly crystalline zeolite 4A encapsulating magnetic particles derived from the red mud, avoiding oxidation and corrosion of the magnetic material in acidic solutions. A series of magnetic zeolite 4A (MZ) were obtained by introducing varying percentages of red mud and kaolinite, and their morphological, structural, magnetic and adsorption properties were investigated. The BET specific surface area of the obtained MZ-20 is 13.6 m2/g. MZ-20 (red mud: kaolinite mass percentage is 20%) displayed the maximum adsorption capacity of 172 mg/g for Sr(II). Within 1 h, 96.4% of the Sr(II) was removed. The adsorption kinetics and isotherms followed the pseudo-second-order and Langmuir models, respectively. Using a mixed 0.1 M NaCl and 0.1 M HCl solution as eluent, the magnetic adsorbent maintained high desorption and regeneration ratios along with stable magnetic properties after four adsorption-desorption cycles. In summary, the MZ-20 adsorbent exhibited high adsorption capacity, recyclability and excellent magnetic properties, making it a decontamination candidate for removing Sr(II) from radioactive wastewater.

Vortex-blending matrix solid-phase dispersion and UPLC-Q-TOF/MS were proposed to extract and examine the urushiols from Toxicodendron vernicifluum bark

Toxicodendron vernicifluum bark has been used for many years as a component in foods and as a traditional herbal medication. Unfortunately, the presence of urushiols, which induce allergies, limits its application. This study used a vortex-blending matrix solid-phase dispersion microextraction technique to extract urushiols from Toxicodendron vernicifluum bark. HPLC was used to evaluate the amounts of the extracted urushiols (15:0, 15:1, 15:2, and 15:3). The modified magnetic adsorbent was prepared through an in situ coprecipitation method and characterized using a variety of techniques. The optimized extraction conditions are as follows: using magnetic Zeolite Socony Mobil-Five as an adsorbent, a 1:2 sample/adsorbent ratio, 2.5 min of vortex-blending time, 4 mL of 0.1% (V/V) trifluoroacetic acid-methanol as the elution solvent and 8 min of ultrasound time. There was good linearity and high repeatability in the method. Furthermore, the limits of detection for the urushiols ranged from 0.20 to 0.50 μg/mL. Under the optimized conditions, 50 compounds were identified by ultra high performance liquid chromatography and quadrupole time-of-flight mass spectrometry. These compounds included 8 phenolic acids, 9 monomeric urushiols, 11 urushiol dimers, 10 other components, and 11 flavonoids. The suggested approach, which has the advantages of few stages and high extraction efficiency over existing extraction procedures, is a potentially useful method for obtaining and evaluating urushiols in raw materials or extracts.

Adsorption and immobilization of phosphorus from water and sediments using a lanthanum-modified natural zeolite: Performance, mechanism and effect

The challenge of effectively controlling endogenous pollution and achieving phosphate recovery remains a hotspot worldwide. The development of a passivator with high adsorption capacity and superior passivating effect is crucial for effective implementation in controlling endogenous pollution. In this study, a lanthanum-modified natural zeolite (LZ) and a lanthanum-modified magnetic zeolite (LMZ) were synthesized using precipitation and hydrothermal methods. Additionally, characterization and incubation experiments were conducted to assess the adsorption and passivation effects of the material. The results showed that the LZ and LMZ had excellent phosphorus (P) adsorption and passivation capabilities. LZ and LMZ exhibited remarkable adsorption capacities of 122.7 and 109.17 mg/g, respectively, surpassing those of most lanthanum-modified materials. The characterization showed that inner sphere complexation and electrostatic attraction served as the primary mechanisms facilitating phosphate adsorption. Moreover, LZ and LMZ were also used as sediment passivators to immobilize P within sediments. The addition of LZ and LMZ could not only control the release of P in overlying water but also transform unstable iron-bound phosphorus (BD-P) and organoclastic phosphorus (Org-P) into stable aluminum-bound phosphorus (OH-P) and calcium-bound phosphorus (H-P). The application of both LZ and LMZ could effectively reduce various forms of Bio-P in the sediment, including algal-available phosphorus (Al-P), sodium bicarbonate extractable phosphorus (Olsen-P), water-soluble phosphorus (WA-P), and iron oxide extractable phosphorus (Fe-P). The amount of LZ and LMZ needed for fixed Fe-P in sediments could be quantitatively calculated within a certain range. Since LMZ could be recovered from water under the action of an applied magnetic field and had better effects on the potential active phosphorus (Mob-P) and Bio-P in the sediments, LMZ could have high potential for use as a passivator for internal pollution control.

Magnetic Zeolite: Synthesis and Copper Adsorption Followed by Magnetic Separation from Treated Water

Zeolites are widely used in diverse applications, including the removal of heavy metals from wastewater. However, separating fine-sized zeolite particles from treated water is often a challenge. In this work, a novel method utilizing a colloidal polyvinyl alcohol (PVA) solution to bind iron oxide nanoparticles to a Linde Type A (LTA) zeolite was used to synthesize magnetic zeolite. Different zeolite–iron oxide nanoparticle loadings (10:1, 10:0.5, and 10:0.1) were used in batch adsorption experiments to investigate adsorption capacities and kinetics for Cu removal from an aqueous solution. The results showed that the magnetic zeolite maintained much of its adsorbent properties while facilitating a simplified process design. Thus, the adsorption capacity of pure LTA zeolite was found to be 262 mg/g for magnetic zeolite, with a 10:1 ratio—151 mg/g; 10:0.5—154 mg/g; and 10:0.1—170 mg/g. Magnetic separation was subsequently employed to remove the magnetic zeolite from the treated solution.

Magnetic zeolite@β-cyclodextrin-gum Arabic nanocomposite for adsorptive removal of levofloxacin

This study reports the synthesis, characterisation, and application of magnetic zeolite@β-cyclodextrin-gum Arabic (MZ@β-CD-GA) adsorbent for adsorptive removal of levofloxacin (LEV). The kinetic studies confirmed that the adsorption of LEV was described by pseudo-second order and Elovich models. Furthermore, Langmuir and Sips isotherms confirmed a monolayer adsorption process. While the Dubinin-Radushkevich model confirmed that the mechanism was controlled by chemisorption (Ea > 20 kJ/mol). Furthermore, the maximum Langmuir adsorption capacity of MZ@β-CD-GA nanocomposite for sorption of LEV was 150 mg/g. The negative values of ΔG° and positive ΔH° suggested that the adsorption process was feasible, spontaneous, and endothermic. The applicability of MZ@β-CD-GA material was evaluated for the laboratory-scale treatment of real water samples spiked with known concentrations of LEV, and the removal efficiencies ranged from 89-97.8%. Findings from this study indicate that MZ@β-CD-GA material was commercially feasible and can be used as an alternative adsorbent in antibiotic decontamination.

Ultra-High Adsorption Capacity of Core-Shell-Derived Magnetic Zeolite Imidazolate Framework-67 as Adsorbent for Selective Extraction of Theophylline.

A core-shell-derived structural magnetic zeolite imidazolate framework-67 (Fe3O4-COOH@ZIF-67) nanocomposite was fabricated through a single-step coating of zeolite imidazolate framework-67 on glutaric anhydride-functionalized Fe3O4 nanosphere for the magnetic solid-phase extraction (MSPE) of theophylline (TP). The Fe3O4-COOH@ZIF-67 nanocomposite was characterized through scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectrometry, Fourier transform infrared spectroscopy, Zeta potential analysis, X-ray diffraction, Brunauer-Emmett-Teller, and vibrating sample magnetometer. The material has a high specific surface area and good magnetism, which maintains the regular dodecahedron structure of ZIF-67 without being destroyed by the addition of Fe3O4-COOH nanospheres. The Fe3O4-COOH@ZIF-67 can rapidly adsorb TP mainly through the strong coordination interaction between undercoordinated Co2+ on ZIF-67 and -NH from imidazole of TP. The adsorption and desorption conditions, such as the amount of adsorbent, adsorption time, pH value, and elution solvent, were optimized. The kinetics of TP adsorption on Fe3O4-COOH@ZIF-67 was found to follow pseudo-second-order kinetics. The Langmuir model fits the adsorption data well and the maximum adsorption capacity is 1764 mg/g. Finally, the developed MSPE-HPLC method was applied in the enrichment and analysis of TP in four tea samples and rabbit plasma. TP was not detected in oolong tea and rabbit plasma, and its contents in jasmine tea, black tea, and green tea are 5.80, 4.31, and 1.53 μg/g, respectively. The recoveries of spiked samples are between 74.41% and 86.07% with RSD in the range of 0.81-3.83%. The adsorption performance of Fe3O4-COOH@ZIF-67 nanocomposite was nearly unchanged after being stored at room temperature for at least 80 days and two consecutive adsorption-desorption cycles. The results demonstrate that Fe3O4-COOH@ZIF-67 nanocomposite is a promising magnetic adsorbent for the preconcentration of TP in complex samples.

Unravelling the role of the exchanged Ni amount in zeolites A and X for their thermal transformation into magnetic metal-ceramic nanocomposites

Magnetic zeolites with a Ni content of 4.80 and 6.20 wt%, were prepared by Ni-exchanging zeolites 4 A and 13×, respectively, and thermally treating the Ni-exchanged zeolites at 735–750 °C, under a reducing atmosphere. This thermal treatment gave rise to the formation of Ni0 nanoparticles dispersed in a ceramic matrix, which partially retained the zeolitic structure (about 50%). The obtained nanocomposites were fully characterized using atomic absorption spectrometry, X-rays powder diffraction (with synchrotron source) followed by Rietveld analysis, High-Resolution Transmission Electron Microscopy, N2 adsorption/desorption at −196 °C and magnetic measurements at both room temperature and low temperature. To highlight the effect of nickel content on the final properties of the nanocomposites, the features of the samples produced in this work were compared with the features of the nanocomposites obtained, in previous works, from the same zeolites loaded with a low (approx. 1%) and a high (approx. 15 wt%) Ni content.The most important result obtained here is that only by entering the intermediate Ni content of this work (4.80–6.20 wt%) it was possible to obtain real magnetic zeolites as the final product of the process. The low Ni content gave rise to a poor magnetic response, whereas the high Ni content resulted in the almost total destruction of the zeolite framework.

Preparation of Magnetic Zeolites for Medicinal Purposes

Preparation of Magnetic Zeolites for Medicinal Purposes

Synthesis of magnetic NaY zeolite for plasma proteomics application

Magnetically modified NaY zeolite has shown advantages in high-throughput and large-scale clinical plasma proteomic studies. In this study, magnetic NaY zeolite was prepared via an improved method, "layer by layer adhesion", using epoxy adhesive. The morphology, structure, and magnetic properties of magnetic NaY zeolite were characterized and tested by scanning electron microscope (SEM), fourier transform infrared spectrometer (FT-IR), X-ray diffractometer (XRD), and vibrating sample magnetometer (VSM), and using sodium dodecyl sulfonate-polyacrylamide gelelectrophoresis (SDS-PAGE) and liquid chromatography-tandem mass spectrometry (LC-MS) for plasma proteomics studies. The results showed that NaY zeolite was coated on the surface of Fe3O4 by epoxy adhesive, and such coating did not affect the surface properties of the magnetic zeolite. The saturation magnetization of magnetic NaY zeolite was measured as 9.964 emu g−1. Approximately 2929 proteins could be identified from plasma protein corona formed on magnetic NaY zeolite, reaching 97.6 % of the identification number of pure NaY zeolite. Furthermore, compared with NaY zeolite, the solid-liquid separation processes of magnetic zeolite during plasma proteomics studies were significantly reduced from half an hour to few minutes. Due to excellent plasma protein adsorption performance and rapid magnetic separation property, magnetic NaY zeolite is expected to become a powerful tool for the large-scale adsorption of low-abundant plasma proteins and high-throughput proteomic studies.

Feasible synthesis of magnetic zeolite from red mud and coal gangue: Preparation, transformation and application

A feasible synthesis of magnetic zeolite from the mixture of industrial solid wastes (red mud and coal gangue) was proposed. The preparation conditions, formation mechanism and adsorption performance of magnetic zeolite were investigated. Magnetic zeolite with uniform distribution of zeolite and magnetite could be successfully synthesized at the alkali reducing calcination conditions of n(Na:Al:Si) = 3.6:1:1, 600 °C, 1.5 h and the hydrothermal conditions of n(Na:H2O) = 2.8:1, 90 °C, 9 h. During this process, aluminosilicates in the mixture of red mud and coal gangue could be transformed into sodium-containing phases and zeolite A in turn; meanwhile, hematite in red mud could be reduced by carbon in coal gangue to transform into magnetite. The prepared magnetic zeolite showed excellent adsorption capacity and reusability for heavy metals. The maximum adsorption capacity for Cu2+, Cd2+ and Pb2+ reached 76.2, 92.2 and 178.4 mg/g, respectively, which could be attributed to the different ionic radius of heavy metals.

Solidification of cesium containing magnetic zeolite sorbent by spark plasma sintering

The possibility of effective solidification of spent sorbents containing radioactive cesium by spark plasma sintering (SPS) technology for their safe and long-term disposal was studied. The kinetics of consolidation spent sorbent based on magnetic zeolite after adsorption saturation with cesium (∼23 wt %) under SPS conditions in the range of 700–950 °C was carried out. The structural, elemental and phase composition changes during high-rate (minutes) heating of zeolite powder saturated with Cs+ ions was studied by SEM, EDX and XRD methods. As a result, ceramic samples with mineral-like structure of Fe-substituted pollucite CsFeSi2O6 were successfully obtained. It was determined that the optimal temperature of SPS consolidation was 900 °C, at which the formation of CsFeSi2O6 ceramics with a relative density of 91.2%, compressive strength of 497.6 MPa, Vickers microhardness of 1019 HV, rate of cesium leaching of 2.33 × 10−8 g/cm2 × day was reached. It was found that the mechanism of cesium diffusion from the volume of ceramics corresponded to flushing from the available surface of the sample, the lowest diffusion coefficient was 2.71 × 10−16 cm2/s, as well as the lowest penetration depth of the solution into the volume of ceramics was 1.04 × 10−5 cm. The adsorbents prepared by SPS up to 900 °C retained the magnetization, and at higher temperature the magnetization decreased, which was caused by phase and structural changes of ceramics. The characteristics of ceramic obtained from spent adsorbent complied with the requirements of GOST R 50926–96 and ISO 6961:1982 for solidified Cs-containing radioactive waste.

Immobilization of Dithizone on Magnetic Zeolite in Less Toxic Medium and its Application as Adsorbent Cd(II) Ion in Water

One of the most dangerous pollutants frequently found in environment are heavy metal ions. Industrial effluents especially those rich in heavy metals are potential pollution source for aquatic environment. In this study, magnetic modification of activated natural zeolite (MZ) was prepared and then used as host for immobilization of dithizone in less toxic alkaline medium. The obtained material, dithizone-immobilized magnetic zeolite (MZD) was applied as adsorbents for adsorption of heavy metal Cd (II) ion in water. The mechanism of interaction between the adsorbent and Cd (II) ion was studied by sequential desorption experiments of Cd (II) ion using different solvents. The adsorbents were characterized by FTIR and XRD to confirm the successful magnetization and immobilization of dithizone on the activated natural zeolite. Results of adsorption study shows that adsorption capacity of MZ and MZD adsorbents towards Cd (II) ion are 17.8 and 37.5 mg g-1, respectively. The adsorption of Cd (II) on both adsorbents is best described by pseudo 2nd order reaction and follow Langmuir isotherm adsorption model. Sequential desorption experiments has revealed that Cd (II) adsorption on MZ is dominated by electrostatic interaction while that on MZD is mostly occurred through complexation. The synthesized materials is promising to be used as adsorbent of heavy metals because it can magnetically be separated and selectively adsorbed heavy metals with higher capacity.

Adsorption removal of nitrate by a novel magnetic zeolite adsorbent (zeolite/γ-Fe2O3 nanocomposite) in solution

Adsorption removal of nitrate by a novel magnetic zeolite adsorbent (zeolite/γ-Fe2O3 nanocomposite) in solution

Surface Modification of Magnetic Nanoporous Silica with Carbon Based Materials for Enhancing Organic Dye Removal

The issue of wastewater from the dyeing industry entering the environment has significantly impacted both humans and other species. The dye blocks the photosynthesis process of aquatic plants and causes oxygen depletion in the marine environment. The dye is difficult to remove from wastewater due to their aromatic chemical structure. When the dye enters to human body, it can cause cancer, cell damage, and life-threatening conditions. Different methods have been investigated to remove the dye such as precipitation, photocatalytic, ion exchange, and membrane filtration. Those methods were difficult to apply on wide scale due to either their high cost or low efficiency. Adsorption is still an economical and effective method due to the cheap production cost and the reusability of the materials.Nanomaterials have great promises in improving many issues related to energy, catalysis, biomaterials, sensing applications and designing novel adsorbent materials [1-31]. Nanosize adsorbent materials have been utilized and great affinity for removing inorganic and organic species.In this study, we develop a new method of modifying and activating the magnetic zeolite Y, as a nanoporous adsorbent by utilizing cetyltrimethyl ammonium bromide (CTAB). We applied mechanochemical synthesis method to combine CTAB with magnetic zeolite Y. The composite was applied to adsorb methylene blue. The adsorbing efficiency was monitored by UV-Vis spectrophotometer. The study showed that at 500 mg/L, the composite adsorbed 12% of methylene blue. At 1000 mg/L and 5000 mg/L, the composite adsorbed 71% and 100% of methylene blue, respectively. References ME Mahmoud, MA Khalifa, YM El Wakeel, MS Header, TM Abdel-Fattah, Journal of Nuclear Materials 487, 13-22 (2017)C Huff, T Dushatinski, TM Abdel-Fattah, International Journal of Hydrogen Energy 42 (30), 18985-18990 (2017)M Stacey, C Osgood, BS Kalluri, W Cao, H Elsayed-Ali, T Abdel-Fattah, Biomedical Materials 6 (1), 011002 (2011)SE Mohmed Labeb, Abdel-Hamed Sakr, Moataz Soliman, Tarek M.Abdel-Fattah, Optical Materials 79, 331-335 (2018)ME Mahmoud, MM Osman, SB Ahmed, TM Abdel-Fattah, Chemical engineering journal 175, 84-94 (2011)TM Abdel-Fattah, ME Mahmoud, Chemical engineering journal 172 (1), 177-183 (2011)R Bhure, TM Abdel-Fattah, C Bonner, JC Hall, A Mahapatro, Journal of biomedical nanotechnology 6 (2), 117-128 (2010)TM Abdel-Fattah, D Loftis, A Mahapatro, Journal of biomedical nanotechnology 7 (6), 794-800 (2011)OH Elsayed-Ali, T Abdel-Fattah, HE Elsayed-Ali, Journal of hazardous materials 185 (2-3), 1550-1557 (2011)R Bhure, A Mahapatro, C Bonner, TM Abdel-Fattah, Materials Science and Engineering: C 33 (4), 2050-2058 (2013)BE Bishop, BA Savitzky, T Abdel-Fattah, Ecotoxicology and Environmental Safety 73 (4), 565-571 (2010)C Huff, JM Long, A Heyman, TM Abdel-Fattah, ACS Applied Energy Materials 1 (9), 4635-4640 (2018)TM Abdel-Fattah, EM Younes, G Namkoong, EM El-Maghraby, Synthetic Metals 209, 348-354 (2015)S Ebrahim, M Soliman, TM Abdel-Fattah, Journal of electronic materials 40 (9), 2033-2041 (2011)SH Lapidus, A Naik, A Wixtrom, NE Massa, V Ta Phuoc, L del Campo, Crystal growth & design 14 (1), 91-100 (2014)A Mahapatro, TD Matos Negrón, C Bonner, TM Abdel-Fattah, Journal of Biomaterials and Tissue Engineering 3 (2), 196-204 (2013)S Ebrahim, M Labeb, T Abdel-Fattah, M Soliman, Journal of Luminescence 182, 154-159 (2017)T Dushatinski, C Huff, TM Abdel-Fattah, Applied Surface Science 385, 282-288 (2016)ME Mahmoud, SS Haggag, MA Rafea, TM Abdel-Fattah, Polyhedron 28 (16), 3407-3414 (2009)C Huff, JM Long, A Aboulatta, A Heyman, TM Abdel-Fattah, ECS Journal of Solid State Science and Technology 6 (10), M115 (2017)A Wixtrom, J Buhler, T Abdel-Fattah, Journal of Chemical Education 91 (8), 1232-1235 (2014)ME Mahmoud, SS Haggag, TM Abdel-Fattah, Polyhedron 26 (14), 3956-3962 (2007)TM Abdel-Fattah, ME Mahmoud, MM Osmam, SB Ahmed, Journal of Environmental Science and health, part A 49 (9), 1064-1076 (2014)ME Mahmoud, TM Abdel-Fattah, MM Osman, SB Ahmed, Journal of Environmental Science and Health, Part A 47 (1), 130-141 (2012)C Huff, E Biehler, Q Quach, JM Long, TM Abdel-Fattah, Colloids and Surfaces A: Physicochemical and Engineering Aspects 610 (5), 125734 (2021)K Foe, G Namkoong, TM Abdel-Fattah, H Baumgart, MS Jeong, DS Lee, Thin solid films 534, 76-82 (2013)M Abdel-Fattah, A Wixtrom, K Zhang, W Cao, H Baumgart, ECS Journal of Solid State Science and Technology 3 (10), M61 (2014)C Huff, T Dushatinski, A Barzanji, N Abdel-Fattah, K Barzanji, ECS Journal of Solid State Science and Technology 6 (5), M69 (2017)TM Abdel-Fattah, B Bishop, Journal of Environmental Science and Health, Part A 39 (11-12), 2855-2866 (2014)Quach, E. Biehler, A. Elzamzami, C. Huff, J.M. Long, T.M. Abdel Fattah, Catalysts, 11, 118 (2021).E. Biehler, Q. Quach, C. Huff, T. M. Abdel-Fattah, Materials, 15, 2692 (2022).