Nano Sorbent Research Articles

Ponceau 4R elimination from fruit juice: An integrated optimization strategy utilizing artificial neural networks, least squares, and chitosan-nickel ferrite Nano Sorbent

The goal of present work is to examine the efficiency of aminated-chitosan/NiFe2O4 nanoparticles (AmCs/NiFe2O4 NPs) produced for removing Ponceau 4R (P4R) from fruit juice through an adsorption process. The resulting nanoparticles were characterized using various techniques. The modeling of results was done using least squares (LS) and Radial basis function-artificial neural network (RBF-ANN). The optimum removal of P4R (91.43 %) was obtained at the following optimum conditions: pH 4.47, adsorbent dosage 0.047 g/L, contact time approximately 57.78 min, and initial concentration P4R 26.89 mg/L. The highest adsorption capacity (qm) was found to be 208.33 mg g−1. The P4R adsorption mostly followed the Freundlich and pseudo-second-order isotherm kinetic models. Both LS-based models and RBF-ANN provided good predictions for independent variables. The dye elimination efficacy for juice samples were approximately 90.34 %. Therefore, based on the obtained results, it can be claimed that the prepared AmCs/NiFe2O4 NPs can be used to remove P4R.

Fabrication and Application of RuO2@Co3O4 Nano Sorbent to Eradicate Cobalt ions (II) from Synthetic Wastewater

Fabrication and Application of RuO2@Co3O4 Nano Sorbent to Eradicate Cobalt ions (II) from Synthetic Wastewater

Utilization of efficient Al2O3@g-C3N4 nano sorbent for eliminated Ni (II) ions from polluted water

Toxic metals in water systems pose a global health risk. Thus, multifunctional water monitoring and treatment materials are indispensable. Nickel ions, a frequent heavy metal pollutant, affect ecosystem function. However, developing affordable, functional materials for efficient heavy metal removal remains problematic. This study investigates the utilization of Al2O3@g-C3N4 (AlCN) nanosorbent for adsorbing Ni (II) ions from aqueous solutions. The physicochemical analyses verify the creation of an AlCN nanosorbent with a mean size of 31.25 nm crystals and a specific surface area of 58 m2/g. Batch adsorption experiments were conducted to examine the impact of pH, initial Ni (II) concentration, and adsorbent dose on the efficiency of Ni (II) removal using the synthesized (AlCN) nanosorbent. Adding Al2O3 to g-C3N4 nanosheets increased the adsorption capacity to a maximum of 410 mg/g under ideal conditions, as demonstrated by the results. Ni (II) ions adsorption kinetics on AlCN nanosorbents follow the pseudo-second-order kinetic model with an R2 value of 0.99, surpassing the Elovich pseudo-first model. The adsorption isotherm results show that the Langmuir model fits the experimental data better than the Freundlich and Temkin models, indicating a monolayer adsorption process for the AlCN nanosorbent. In addition, the AlCN exhibited multi-elemental adsorption ability and good recyclability. These findings can nominate the fabricated composite as a candidate for water treatment.

Synthesis of nano magnetic chitosan modified with acrylamide schiff’s base for simultaneous removal of Cu(II) and Co(II) from waste water samples

ABSTRACT A magnetic nano sorbent based on the functionalization of magnetic chitosan with acrylamide was synthesized for Cu(II) and Co(II) removal from wastewater samples. To characterize the magnetic nano sorbent, they have been applied from Fourier transform infrared spectroscopic analysis (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The effective parameters of Cu(II) and Co(II) adsorption on magnetic nano sorbent such as pH of the solution, adsorbent dose, contact time and sample volume, were optimized. Also, the effective parameters on Cu(II) and Co(II) desorption conditions (type and volume of elution solvent) were optimized. The isotherms and kinetics models for the adsorption of Cu(II) and Co(II) on the magnetic nano sorbent were studied. The data were well-fitted with the Langmuir isotherm and pseudo-second-order model. The maximum adsorption capacities for Cu(II) and Co(II) were 165.4 and 159.9 mg g-1, respectively. Also, the thermodynamic parameters were studied. Application of magnetic nano sorbent for 4 times of use was acceptable. For the real samples, the percentage of recovery was higher than 97% and RSD (%) was between 1.4% and 2.7%. Finally, the magnetic nano sorbent exhibited high performance in removing the Cu(II) and Co(II) from wastewater samples.

Tracking the Adsorptive properties of modified nano calcium silicate/CuO composite for Cs(I) and Co(II) uptake from waste stream

Nano calcium silicate modified by copper oxide (CSC) has been prepared as a new sorbent material. The prepared nano sorbent was characterized by applied different analytical techniques as FTIR and SEM as well as thermal analysis (TG/DSC). The Adsorption process for cesium and cobalt ions was executed considering notable parameters such as effect of initial pH, impact of shaking time as well as initial concentration of each ion, and finally the effect of temperature. The obtained results have been revealing that the adsorption process of the studied ions was remarkably get better using CSC. The monolayer capacities of CSC for Cs(I) and Co(II) in binary system were 83.67 and 103.18 mg/g respectively. The kinetic studies exposed that the adsorption process followed nonlinear pseudo-first-order model. The isothermal studies show that the extended Langmuir model is more applicable than Freundlich model for binary system adsorption process. The maximum value of desorption for the Co (II) and Cs(I) is 97.5% and 73.5 utilized 0.1 M of nitric acid. This indicated that CSC can be regenerated and reused for further adsorption of Co (II) and Cs(I) from wastewater.

A novel removal of Ni2+ ions from water solutions using dispersive solid-phase extraction method with nano Fe3O4/chitosan-acrylamide hydrogel.

The effluent release containing heavy metals as Ni2+ ions has drastic risks to both the natural environment and human health. In this research, the nano Fe3O4/chitosan-acrylamide hydrogel was prepared as a novel nano sorbent for dispersive solid-phase extraction of Ni2+ ions and applied to the water sample solution. The pH, amount and type of elution solvent, the extraction time, etc. were optimized to improve the efficiency of the proposed method. Analytical parameters such as concentration factor and relative standard deviation (%) were achieved as 33.3 and 1.8%, respectively. The capacity in equilibrium sorption was calculated at 22.54 mg g-1. Furthermore, to estimate the adsorption mode, Freundlich, Langmuir, and Temkin models were fitted with experimental isotherm data. Besides, to check the basic process of the metal adsorption mechanism, pseudo-first-order, pseudo-second-order, and Roginsky-Zeldovich models were investigated and the results were fitted with the pseudo-second-order model. The value of change in entropy (⊿S) obtained is -65.24 (J(mol K)-1). Negative values of change in enthalpy, ⊿H in (kJ mol-1) is -24.45 (kJ mol-1) which indicates both physical and chemical adsorptions involved in the process of adsorption. Finally, the nano Fe3O4/chitosan-acrylamide hydrogel exhibited high performance to remove the Ni2+ ions from water sample solution.

Modeling sunset yellow removal from fruit juice samples by a novel chitosan-nickel ferrite nano sorbent

Analysis of food additives is highly significant in the food industry and directly related to human health. This investigation into the removal efficiency of sunset yellow as an azo dye in fruit juices using Chitosan-nickel ferrite nanoparticles (Cs@NiFe2O4 NPs). The nanoparticles were synthesized and characterized using various techniques. The effective parameters for removing sunset yellow were optimized using the response surface methodology (RSM) based on the central composite design (CCD). Under the optimum conditions, the highest removal efficiency (94.90%) was obtained for the initial dye concentration of 26.48 mg L−1 at a pH of 3.87, a reaction time of 67.62 min, and a nanoparticle dose of 0.038 g L−1. The pseudo-second-order kinetic model had a better fit for experimental data (R2 = 0.98) than the other kinetic models. The equilibrium adsorption process followed the Freundlich isotherm model with a maximum adsorption capacity of 212.766 mg g−1. The dye removal efficiency achieved for industrial and traditional fruit juice samples (91.75% and 93.24%), respectively, confirmed the method's performance, feasibility, and efficiency. The dye adsorption efficiency showed no significant decrease after five recycling, indicating that the sorbent has suitable stability in practical applications. variousThe synthesized nanoparticles can be suggested as an efficient sorbent to remove the sunset yellow dye from food products.

Highly effective elimination of tetracycline and ciprofloxacin antibiotics from synthetic wastewater by novel magnetic P2W18O62/MIL-101 (Fe)/NiFe2O4 nanocomposite

In this study, a novel magnetic nano sorbent P2W18O62/Fe-MIL-101/NiF2O4 was synthesized in the laboratory setting and was effectively employed for the removal of tetracycline (TC) and Ciprofloxacin (CIP) from water. Several investigations were conducted to substantiate these outcomes such as vibrating sample magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, X-ray diffraction (XRD) and BET analysis. The research established that nanoadsorbent has a surface area of 67.54 m2/g and adsorption capacities of 243.90 mg/g for TC and 596.54 mg/g for CIP. Factors impacting the adsorption process (solution pH, drug concentration, adsorbent dosage, contact time, and temperature) were investigated using the Box-Behnken design (BBD) in response surface methodology (RSM). The optimal values for obtaining the highest removal of the studied drugs were pH of 10, Contact time of 10 min for CIP and 20 min for TC, Drug concentration 75 mg/L, and Nanoadsorbent mass 0.04 g/L. These optimal values resulted in a removal efficiency of 100% for CIP and 90% for TC were achieved. The Langmuir isotherm and pseudo-second-order (PSO) with (R2 = 0.999) and (R2 = 0.999 for TC and 0.998 for CIP) were the best isotherms and kinetic models in the description of the observed data, respectively. The adsorption process demonstrated chemisorption behavior, characterized by adsorption energies of 16.92 kJ/mol for TC and 11.2 kJ/mol for CIP. Thermodynamic assessments revealed an endothermic and spontaneous nature of the adsorption process with elevated temperatures correlating with increased adsorption. The magnetic properties of P2W18O62/Fe-MIL-101/NiFO nanoadsorbent facilitated easy separation post-adsorption. The adsorbent displayed consistent performance over five cycles, maintaining its chemical composition and structural integrity, as validated by XRD, SEM, and VSM analyses before and after reuse. The interaction mechanism between P2W18O62/Fe-MIL-101/NiFO and TC/CIP encompassed electrostatic interactions, p-p interactions, hydrogen bonding, and pore filling. As a result, MOF-based magnetic nanoadsorbent can be used as a suitable adsorbent for TC and CIP removal from aqueous solutions.

Sources of Antibiotic Contamination in Wastewater and Approaches to Their Removal—An Overview

In the practice of medicine, antibiotics are extremely important and are employed in the treatment of infections. A lot of antibiotics are consumed by humans and excreted via urine and feces into sewage systems and treatment plants. These are considered to be non-biodegradable, and over the years they accumulate in the aquatic environment. The presence of antibiotics in water resources causes the emergence of antibiotic-resistant bacteria, posing a serious threat to the health of human beings. Water bodies must be adequately treated before being discharged to prevent the spread of antibiotic resistance. In the present article, the sources of antibiotics and strategies used for their effective removal, such as ultrafiltration, microfiltration, nanofiltration, membranous biological reactor treatment, Advanced Oxidation Process (AOP), Reverse Osmosis (RO) and Nano sorbents, are discussed. Conventional wastewater treatment plants are not able to eliminate antibiotics deposition/resistance genes effectively and efficiently. In this regard, the adsorption method is the most effective way of removing antibiotics from wastewater from various sources.

Evaluation of tetracycline removal by magnetic metal organic framework from aqueous solutions: Adsorption isotherm, kinetics, thermodynamics, and Box-Behnken design optimization

In our current research, an intriguing magnetic nano sorbent Fe3O4@Zr-MOF was synthesized in the lab. We used this adsorbent for successfully removing tetracycline (TC) from water. We performed a number of experiments and studies to further support this, including the following: vibrating sample magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller surface area (BET). Our studies have determined that the Fe3O4@Zr-MOF boasts a considerable surface area of 868 m2/g with the highest adsorption capacity (qmax) of 942.12 mg/g. Study the factors that effect on adsorption process such as pH, TC concentration, adsorbent dose, and temperature. The adsorption isotherm was fitted to the Langmuir equation, whereas the kinetic isotherm to the pseudo-second-order equation. The adsorption process was chemisorption as well as the adsorption energy was 20 kJ/mol. Adsorption thermodynamics indicated that the adsorption process was both endothermic and spontaneous. As temperatures increased, the amounts of materials absorbed also increased. The Fe3O4@Zr-MOF has magnetic properties as it easily to remove from the solution after adsorption process. The adsorbent was used for five cycles with high efficiency and without change in the chemical composition as well as the XRD was the same before and after reusability. The mechanism of the interaction between Fe3O4@Zr-MOF and TC was expected on: Electrostatic interaction, π-π interaction, hydrogen bonding, and pore filling. The adsorption results were optimized using Box Behnken-design (BBD).

Raw fruit juice processing wastewater treatment using electrochemical coagulation followed by synthesis of CuO Nano sorbents using leaf extract

Stainless steel and aluminium electrode was utilized inside batch electro chemicals coagulations (BECCs) using current densities (CD) for the treatment of fruit juice processing wastewater (FJPW). During ECC, ~65-70% color removal and COD removal of ~55-60% was observed for CD 260 A/m2 at 75 min electrolysis time for both 4SS (four stainless steel) and 4Al (four aluminium) electrodes. In general, 4SS and 4Al electrodes had less influence on FJPW for all CDs. Therefore, to improve the quality of treatment of leftover color and COD by BECC treatment, the batch adsorption studies were conducted as secondary treatment by synthesis of CuO nanoparticles using Carica papaya, Centella asiatica (CA), Ocimum sanctum and 1:1:1 mixture of leaves. An effect of several operating parameters like adsorbent dose, pH, and contact duration on leftover color and COD removal was studied for optimal conditions to treat FJPW. The results showed that ~70% color and ~65% Chemical Oxygen Demand elimination at an optimal condition for adsorbent dosages 0.60 g/L, at pH 8.0 to 8.5 and contact time 40 min for CA and 1:1:1 mixture of leaves. Altogether, BECC - nanosorption, a dual treatment, effectively treated FJPW wastewater with clean water reclamations of up to 90%.

Carbon nanotubes/metal-organic framework based magnetic dispersive micro-solid phase extraction for the determination of triazole fungicides in wastewater and soil samples

In this research, the magnetic dispersive micro solid phase extraction (M−D-µ-SPE) method was used for pre-concentration and trace detection of triazole fungicides in agricultural wastewater and soil samples. The nano sorbent used for M−D-µ-SPE is based on a magnetic carbon nanotubes/Cu-based MOF (M−MWCNT−Cu−BDC) nanocomposite, which was synthesized and characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, vibrating-sample magnetometer, and Nitrogen adsorption-desorption analysis. The effective parameters on the extraction performance were optimized, and under the optimized conditions (pH value: 7.0; the amount of sorbent: 30 mg; extraction time: 30 min; desorbing agent: ethanol; the volume of desorbing solvent: 500 μL and desorption time: 5 min), the limits of detection (LOD) was 0.45 ng mL−1, and the linear range was 1.50 to 750 ng mL−1 with a correlation coefficient higher than 0.993. The repeatability (RSD%) of the method for five replicates ranged from 2.8 to 5.5%. High recoveries (91–94%) and excellent preconcentration factor (PF = 91–94) were also obtained. Finally, this method was applied to determine triazole fungicides in agricultural wastewater and soil samples.

Thermodynamics, kinetics and isothermal studies of tartrazine adsorption onto microcline/MWCNTs nanocomposite and the regeneration potentials

The quest for a cheap, effective, and eco-friendly wastewater treatment technique that is free of secondary toxic byproducts, calls for the fabrication of a nature-friendly adsorbent with a robust capacity to decontaminate polluted water sources and be recycled. To this end, we report the fabrication of novel nanocomposite (KMCM) from microcline (KMC) and multiwall carbon nanotubes (MWCNTs). The adsorbents (KMC and KMCM) were characterized using XRD, BET, SEM, TGA and FTIR. The novel and low-cost nano sorbent were designed for the elimination of tartrazine (Tatz) from wastewater. The adsorption of Tatz onto KMC and KMCM was influenced by adsorbent dose, initial Tatz concentration, contact time and solution pH. Experimental data acquired from the equilibrium studies were well addressed by the Langmuir isotherm model. The maximum uptake capacity of 37.96 mg g−1 and 67.17 mg g−1 were estimated for KMC and KMCM. The kinetics for the adsorption of Tatz onto KMC and KMCM was best expressed by pseudo-second-order and Elovich models. The thermodynamic parameters revealed that the uptake of Tatz onto KMC and KMCM was an endothermic (ΔH: KMC = 35.0 kJ mol−1 and KMCM = 42.91 kJ mol−1), entropy-driven (ΔS: KMC = 177.6 J K−1 mol−1 and KMCM = 214.2 J K−1 mol−1) and spontaneous process. Meanwhile, KMCM demonstrated good reusability potential and superior adsorption efficiency when compared to other adsorbents.

Natural polymer Nicandra physaloides (L.) Gaertn seed gum mediated assembly of hydroxyapatite assembly as versatile sponge for water pollution control

Uranium-containing wastewater has sparked worries about environmental sustainability on a worldwide scale, which has increased the demand for efficient adsorbent materials for contamination cleanup. A composite gel-freeze-drying technique was utilized to create the hydroxyapatite/Nicandra physaloides (L.) Gaertn seeds gum aerogel (NPG-HAP) adsorbent materials, combining the large contact area of three-dimensional materials with the effective adsorption features of nano sorbent materials. The structure and morphologies of NPG-HAP aerogels have used a range of techniques, including scanning electron microscopy (SEM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and others. The average pore sizes of NPG-HAP were 15.87 nm before uranium adsorption and 12.18 nm afterward, concerning specific surface areas of 31.91 m2/g and 4.04 m2/g, respectively. The Langmuir isotherm determined that NPG-HAP aerogel could theoretically adsorb uranium at a maximum rate of 828.75 mg/g. The sorption capacity of NPG-HAP was spontaneous and adhered to a quasi-secondary kinetic model, according to thermodynamic and kinetic measurements. The findings demonstrated that the synthetic NPG-HAP aerogel can be employed as a successful and promising adsorbent for the removal of dyes from wastewater uranium.

Development of electrospun nanofibers based on Poly (vinyl alcohol) for thin film solid-phase microextraction of antidepressant drugs in biological samples

Today, antidepressants are widely used and it is important to determine their trace amounts due to harmful consequences. Here, a new nano sorbent was reported for the simultaneous extraction and determination of three types of antidepressant drugs (Clomipramine (CLO), Clozapine (CLZ), and Trimipramine (TRP) by the thin-film solid-phase micro-extraction (TFME-μSPE) method followed by the Gas Chromatography-flame ionization detector (GC-FID) analysis. So, the compound poly (vinyl alcohol) (PVA)/citric acid(CA)/β-cyclodextrin/Bi2S3@g-C3N4 nano sorbent was constructed by electrospinning technique. Then, nano sorbent was studied to optimize the many parameters impacting the extraction performance. Electrospun nanofiber has a large surface area, high porosity, and homogeneous morphology with a uniform bead-free structure. In optimal conditions, the limits of detection and quantification were calculated to be 0.15–0.03 ng mL−1 and 0.5–0.1 ng mL−1, respectively. The dynamic linear range (DLR) was in the range of 0.1 to 1000 ng mL−1 for CLO and CLZ, and 0.5 to 1000 ng mL−1 for TRP with correlation coefficients (R2) of 0.999. The relative standard deviations (RSDs) were achieved in the range of 4.9–6.8% (intra-day, n = 4) and 5.4–7.9% (inter-day, n = 3) in the period of 3 days. Finally, the capability of the method was evaluated to simultaneously measure trace amounts of antidepressants aqueous sample with desirable extraction efficiency (78 to 95%).

WATER RECLAMATION THROUGH NANOREMEDIATION & BIOREMEDIATION: A WEAL AGAINST CONVENTIONAL CHEMICAL TECHNIQUES

Worldwide unprecedented challenge has been posed due to socio- economical-demographic and environmental transitions. These threats mainly sprout from rapid pace in modernization and advancement of technologies for economic escalation and raising live standards. These however is a bane since over the years there are instances of loss of considerable biodiversity, risks in public health, aggravation of already existing health issues, decline of soil salinity and to add to the plight there is water scarcity that mainly had resulted due to imbalance in the potable water available and its demand. Climate change, indiscriminate efflux of contaminants encompassing household to industrial waste water has profound effects on the standards of water quality. To cope with this situation there should be judicious planning leading to recycling the waste water in a more convenient way over prevalent robust technologies. The focus lies on the participation of nano-based materials that have been revered highly for their large surface to volume ratio and are efficient candidates for solid waste recovery. Nanomaterials both metallic non-metallic and polymeric materials have been the subject of interest for their diligent participation as catalyst, nano sorbents. Besides the participation of natural materials and benevolent biological components in bioremediation of waste water has been discussed herein.

Application of encapsulated and immobilized nano zero-valent iron for iron removal from roof-harvested rainwater

Abstract Rainwater harvesting is a viable option for dealing with the global challenge of increasing water scarcity, but heavy metal contamination often prevents it from being widely used for drinking water purposes. Harvested rainwater collected from galvanized iron (GI) and tile roofs containing iron concentration of 0.46 and 0.38 mg/L respectively, were treated by two nano sorbents, CaCO3-nZVI and PUF/CaCO3-nZVI with the intention of making the iron concentration conform to drinking quality standards. The nano sorbents were synthesized and characterized using BET (Brunauer-–Emmett–Teller surface area), SEM-EDX (Scanning Electron Microscopy-Energy-Dispersive X-ray spectroscopy, and FTIR (Fourier Transform Infrared Spectroscopy). CaCO3-nZVI achieved iron removal efficacy of 88.69% and 89.21% for harvested rainwater from GI sheet roof and tiled roof respectively and the efficiency increased to 95.65% and 95.78% when treated with PUF/CaCO3-nZVI. In addition, the nano sorbents were found to have appreciable removal efficiency for other metals (Pb, Mn, Zn, Cu, Cd and Cr) present in the collected rainwater. The use of FTIR and EDX to characterise spent nano sorbents divulged that the iron was removed through sorption process. This study thus explored the potential of CaCO3-nZVI and PUF/CaCO3-nZVI for treating heavy metal contamination in roof-harvested rainwater.

Removal of Cd (II) Ions from Water Solutions Using Dispersive Solid-Phase Extraction Method with 2-aminopyridine/graphene Oxide Nano-Plates

Background: The effluent release containing heavy metals as Cd (II) ions has drastic risks to both the natural environment and human health. In this research, a novel nano sorbent from the pyridine derivative was prepared for dispersive solid-phase extraction of Cd (II) ions. Methods: Graphene oxide (GrO) was chemically modified by a 2-aminopyridine group (2Ap) through a multistep procedure. The affection of adsorbent amount, pH, temperature, equilibrium time on its sorption with Gr2Ap adsorbent was studied and Gr2Ap adsorbent displayed a high ability to adsorb Cd (II) at pH=6. Furthermore, to inquire about the adsorption isotherms of metal ions sorption mechanism, the model of Freundlich and Langmuir was fitted to empirical isotherm data. Besides, to inspect the basic process of the metal sorption mechanism pseudo-first and second-order kinetic, and Roginsky-Zeldovich types were compatible with adsorption kinetic results. Results: The concentration factor and limit of detection for Cd (II) were 12.5 and 1.84 µg/L, respectively. According to the value of the correlation coefficient factor, that the Gr2Ap adsorbent exhibits the highest ability to adsorb Cd (II) ions (22.54 mg/g) at pH=6. The pseudo-second-order pattern of Cd (II) adsorption fits best with the kinetic result. Conclusion: The Gr2Ap exhibited a high potential for removing the heavy metal ions from aqueous samples. Besides, the current research was shown an efficient, easy, inexpensive, and selectable method for evaluating the Cd (II) ions in several samples of water and wastewater.

Environmental remediation of selenium using surface modified carbon nano tubes - Characterization, influence of variables, equilibrium and kinetic analysis

Selenium is targeted as a priority pollutant to be removed due to its high toxicity level and lethal effects. In this research, a novel nano sorbent was fabricated using ionic liquid on multiwalled carbon nanotubes (IL-MCNT) and employed for Selenium remediation from aqueous media. Besides solution pH, nanocomposite dosage, the initial selenium concentration, temperature and sorption time were also examined as operating variables. At optimal pH 2.0, 96% of the selenium was removed with maximum efficiency with 100 mg/L of IL-MCNT at 308 K, 45 min of contact time, and 110 g of IL-MCNT dosage. From kinetic studies, it appears that the Langmuir isotherm fits the observed data (R2 > 0.9813), supporting the hypothesis that monolayer attachment occurs. The Langmuir isotherm parameters are evaluated as qm = 125 mg/g and KL = 0.172 L/mg. As a result of testing several kinetic models, the pseudo-second-order model was the most suitable for experimental data (R2 > 0.9746). Scanning Electron Microscopy images, FTIR spectra, and thermogravimetric study were used to examine the synthesized nanomaterial.

Comparative Evaluation of Different Surface Coatings of Fe3O4-Based Magnetic Nano Sorbent for Applications in the Nucleic Acids Extraction.

Nucleic acid extraction and purification are crucial steps in sample preparation for multiple diagnostic procedures. Routine methodologies of DNA isolation require benchtop equipment (e.g., centrifuges) and labor-intensive steps. Magnetic nanoparticles (MNPs) as solid-phase sorbents could simplify this procedure. A wide range of surface coatings employs various molecular interactions between dsDNA and magnetic nano-sorbents. However, a reliable, comparative evaluation of their performance is complex. In this work, selected Fe3O4 modifications, i.e., polyethyleneimine, gold, silica, and graphene derivatives, were comprehensively evaluated for applications in dsDNA extraction. A family of single batch nanoparticles was compared in terms of morphology (STEM), composition (ICP-MS/MS and elemental analysis), surface coating (UV-Vis, TGA, FTIR), and MNP charge (ζ-potential). ICP-MS/MS was also used to unify MNPs concentration allowing a reliable assessment of individual coatings on DNA extraction. Moreover, studies on adsorption medium (monovalent vs. divalent ions) and extraction buffer composition were carried out. As a result, essential relationships between nanoparticle coatings and DNA adsorption efficiencies have been noticed. Fe3O4@PEI MNPs turned out to be the most efficient nano sorbents. The optimized composition of the extraction buffer (medium containing 0.1 mM EDTA) helped avoid problems with Fe3+ stripping, which improved the validity of the spectroscopic determination of DNA recovery.