Efficient Nanosorbent Research Articles

Effective capture of As(V) from water by a facile one step hydrothermal synthesized of 2-D bismuthene quantum dots nanosorbent

Arsenic species have been known for their toxic impact on human. Therefore, removal of such pollutant requires efficient and effective removal methodology from polluted water. In this study, bismuthene quantum dots (Bi-ene-QDs) were fabricated by a green and facile one pot-hydrothermal conversion reaction of Bi(NO3)3·5H2O. Bi-ene-QDs exhibited semi-spherical crystalline providing 6.0 nm 157.78 m2/g. Consequently, As(V) capturing by Bi-ene-QDs revealed optimum practical conditions at pH 3, interaction duration time 40 min and 10 mg Bi-ene-QDs dosage. The interaction of As(V) ions with Bi-ene-QDs were confirmed by the appearance of As-O stretching vibration. Moreover, Bi-ene-QDs achieved excellent adsorptive capture percentages of Arsenic ions from sea, tap and wastewater providing 94.61, 95.21 and 94.38% from contaminated samples with 5 mg L−1 Arsenic ions. Therefore, Bi-ene-QDs can be categorized as an unprecedented and efficient nanosorbent for the successful removal of Arsenic ions pollution from various wastewater matrices with > 90.0% efficiency.

RGO-MoO3 Nanocomposite for superior methylene blue removal by adsorption and photocatalysis

Efficient MoO3 and rGO (0.5,1,2 wt.%)-MoO3 nanosorbent was prepared by facile hydrothermal method. X-ray diffraction (XRD) and Raman spectroscopy techniques confirms the orthorhombic phase. Remarkably in 10 ppm MB dye, complete removal was observed for 1:3, 1:5, 1:3.3, 1:3 (mass of catalyst: volume of dye solution) ratio for pure, 0.5 wt.%, 1 wt.%, 2 wt.% rGO-MoO3 nanocomposite, by merely stirring for one hour without any light exposure. The adsorption mechanism was examined in detail using different models including Langmuir isotherm and Pseudo second-order kinetic model. The composite sample, rGO (0.5 wt.%)-MoO3 is the most efficient nanosorbent whereas rGO (2 wt.%)-MoO3 showed the least adsorption. rGO (2 wt.%)-MoO3 was further used for time dependent study in the presence of UV and in the dark. The presence of UV enhances removal due to the combined effect of adsorption and photocatalysis. Scavenger studies were performed to analyze the mechanism of photocatalysis.

Fe3O4@nitrogen-doped carbon core-double shell nanotubes as a novel and efficient nanosorbent for ultrasonic assisted dispersive magnetic solid phase extraction of heterocyclic pesticides from environmental soil and water samples.

Fe3O4@nitrogen-doped carbon core-double shell nanotubes (Fe3O4@N-C C-DSNTs) were successfully synthesized and applied as a novel nanosorbent in ultrasonic assisted dispersive magnetic solid phase extraction (UA-DMSPE) of tribenuron-methyl, fenpyroximate, and iprodione. Subsequently, corona discharge ion mobility spectrometry (CD-IMS) was employed for the detection of the extracted analytes. Effective parameters on theextraction recovery percentage (ER%) were systematically investigated and optimized. Under optimal conditions, UA-DMSPE-CD-IMS demonstrated remarkable linearity in different ranges within 1.0 - 700 ng mL-1 with correlation coefficients exceeding 0.993, repeatability values below 6.9%, limits of detection ranging from 0.30 to 0.90 ng mL-1, high preconcentration factors (418 - 435), and ER%values (83 - 87%). The potential of the proposed method was further demonstrated by effectively determining the targeted pesticides in various environmental soil and water samples, exhibiting relative recoveries in the range 92.1 - 102%.

Effective adsorption of amoxicillin by using UIO-66@ Cr-MIL-101 nanohybrid: isotherm, kinetic, thermodynamic, and optimization by central composite design

In this research, the amoxicillin (AMX) removal was studied on a prepared nanosorbent from MOFs. The aim of this research work is to prepare nanohybrids based on metal–organic frameworks (MOFs) as an efficient nanosorbent for the absorption of amoxicillin drug. In this study, UIO-66 nanoparticles (UIO-66 NPs) were prepared from Zirconium (Zr) metal and 1,4-benzene dicarboxylic acid (BDC). Then UIO-66@Cr-MIL-101 nanohybrid was synthesized by hydrothermal method. Structural and physicochemical properties of nanohybrid UIO-66@Cr-MIL-101 were characterized by different analyses such as X-ray diffraction analysis (XRD), fourier transform infrared spectrometer (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), therapeutic goods administration (TGA), and Brunauer–Emmett–Teller (BET). The effect of four fundamental variables effective on adsorption was optimized by the central composite response surface methodology (CCRSM). This parameters including loading percentage of Cr-MIL-101 NPs (10–30%), initial concentration of AMX (20–140 mg L−1), contact time (20–60 min), and pH (20–10). The removal percentage (Re%) of AMX equal to 99.50% was obtained under the following conditions: The loading value of 20% Wt%, the initial concentration of AMX 80 mg L−1, contact time 20 min, and pH = 6. Also, the experimental data were investigated with famous kinetic models and isotherms, and it was observed that AMX removal by nanohybrid is correlated with the PSO kinetic model and Langmuir isotherm.

Application of oxidized multi-walled carbon nanotubes and zeolite nanoparticles for simultaneous preconcentration of codeine and tramadol in saliva prior to HPLC determination

In this work, a dispersive micro-solid phase extraction technique along with high-performance liquid chromatography-UV detection was developed for simultaneous preconcentraion and determination of trace levels of codeine and tramadol in human saliva. This method is based on the adsorption of codeine and tramadol on a mixture of oxidized multi-walled carbon nanotubes and zeolite Y nanoparticles with 1:1 ratio as an efficient nanosorbent. Various analytical parameters influencing the adsorption step including the amount of adsorbent, the pH of the sample solution, the temperature, the stirring rate, the contact time of the sample solution, and the adsorption capacity were investigated. Based on the results, 10 mg adsorbent, sample solutions with pH = 7.6, temperature of 25 °C, stirring rate 750 rpm and contact time 15 min, in the adsorption step shows the best results for both drugs. Then the effective parameters on the analyte desorption stage such as the type of desorption solution, pH of the desorption solution, desorption time and desorption volume were investigated. Studies have shown that water/methanol (50:50 v/v) as desorption solution, pH = 2.0, desorption time of 5 min and desorption volume of 2 ml gives the best results.Chromatographic separation was performed on a RP-Shim-pack CLC-ODS-C18 column (250 mm × 4.6 mm, 5 µm) with isocratic mode. The mobile phase contained of acetonitrile:phosphate buffer (18:82, v/v) at pH = 4.5 and the flow rate was 1 ml.min−1. The wavelength of UV detector was adjusted at 210 nm and 198 nm for codeine and tramadol, respectively.Under optimum conditions, the extraction efficiencies of 98.5% and 99.2% were achieved for codeine and tramadol respectively. Enrichment factor of 13, detection limit of 0.3 μg L−1, relative standard deviation of 4.07 for codeine; and an enrichment factor of 15, a detection limit of 0.15 μg L−1, and standard deviation of 2.06 for tramadol were calculated. The linear range of the procedure for each drug was 1.0 to 1000 μg L−1. This method was successfully applied for the analysis of codeine and tramadol in saliva samples.

Heterogeneous adsorbent based on CeZrO2 nanoparticles doped magnetic graphene oxide used for vortex assisted magnetic dispersive solid phase extraction of erythromycin in chicken

A simple, fast, and efficient method of vortex assisted magnetic dispersive solid phase extraction for separation and pre-concentration of erythromycin in chicken samples prior to high LC-UV determination has been developed. The novel heterogeneous CeZrO2 nanoparticles doped magnetic graphene oxide, for use as an efficient nanosorbent, was synthetised and applied for the adsorption of erythromycin. The synthetised nanosorbent was characterised using both Fourier-transform infra-red (FT-IR) and energy dispersive X-Ray (EDX) spectroscopy together with field emission scanning electron microscopy-EDX. To obtain the best extraction condition and maximum extraction efficiency of erythromycin, the effect of important parameters including pH, amount of sorbent, vortexing time, ionic strength, sample volume, and desorption conditions were investigated. At optimum conditions, a linear range of 0.25–300 µg kg−1, LOD (S/N = 3) of 0.079 µg kg−1, and LOQ (S/N = 10) of 0.270 µg kg−1 were obtained. The precision of the method was established as having an RSD (%) at 100 µg kg−1 of erythromycin for seven replicates of 2.6% and 3.2% for the intra-day and the inter-day, respectively. Recoveries over 94.0% confirmed a high capability of the proposed method for separation and determination of erythromycin residues in chicken being one of the most important animal products.

Coordinate Organic Polymer-Based Nanopores Carbons as an Efficient Nano-Sorbent for Phenol Removal Using the Response Surface Methodology

Coordinate Organic Polymer-Based Nanopores Carbons as an Efficient Nano-Sorbent for Phenol Removal Using the Response Surface Methodology

Improved solid phase extraction for selective and efficient quantification of sunset yellow in different food samples using a novel molecularly imprinted polymer reinforced by Fe3O4@UiO-66-NH2

The overuse of synthetic dyes in food products has gradually increased in recent years, resulting food safety and human health has become a global issue. An innovative design of a magnetic molecularly imprinted polymer (Fe3O4@UiO-66-NH2@MIP) for efficient, fast, and selective determination of sunset yellow (SY) from different food products was described in this study. The absorption properties of Fe3O4@UiO-66-NH2@MIP were elucidated by adsorption kinetics, isotherms, reusability, and selectivity experiments. Because of the incorporation of porous Fe3O4@UiO-66-NH2nanocomposite into molecularly imprinted polymer an efficient nanosorbent with a short equilibrium time, a high adsorption capacity, and a good imprinting factor was finally obtained. The porous Fe3O4@UiO-66-NH2@MIP are also used for quantification of the SY. Under optimal conditions, good linearity (R2 0.9964) in the range of 1.0–120 mg L−1 and a low limit of detection (0.41 mg L−1) was observed with satisfactory recoveries (92.50–106.1%) and excellent reusability (RSD ≤ 6.6% after 12 cycles).

Characterization and application of new efficient nanosorbent Fe2O3 prepared by a modified low-temperature urea method

Characterization and application of new efficient nanosorbent Fe2O3 prepared by a modified low-temperature urea method

Gelatin/sodium triphosphate hydrogel electrospun nanofiber mat as a novel nanosorbent for microextraction in packed syringe of La3+ and Tb3+ ions prior to their determination by ICP-OES

In the present study, the novel gelatin/sodium triphosphate hydrogel nanofiber mat (GT/STP HNFM) was fabricated using the electrospinning strategy. Owing to the formation of ionic complex between STP and GT, the water stability of synthesized nanofiber increased, thereafter, the synthesized water-insoluble nanofiber was applied as a novel nanosorbent in microextraction in packed syringe (MEPS) method, using for the preconcentration of La3+ and Tb3+ in environmental and industrial water samples to the detection of them by an inductively coupled plasma optical emission spectroscopy (ICP-OES). The characterization of nanosorbent was performed and the effect of main parameters on adsorption performance were investigated. Under the optimum condition, the method showed a good linearity ranging from 1 to 500 ng mL−1 with a correlation coefficient superior to 0.998. Additionally, the low detection limits (0.1–0.2 ng mL−1) revealed good sensitivity of the proposed method. Finally, the MESP-ICP-OES method was applied for the determination of La3+ and Tb3+ in environmental and industrial water samples with relative recoveries (RRs) ranging from 85 to 102% and relative standard deviations (RSDs) lower than 2.7%. The outcome of this study revealed an effective method for the extraction and recovery of La3+ and Tb3+ from aqueous solutions using a non-toxic, inexpensive, and efficient nanosorbent.

A comparative study of micro- and nano-structured di-nuclear Co(II) complex, designed to produce efficient nano-sorbent of Co3O4 applicable in the removal of Pb2+

A di-nuclear inorganic complex, formulated as [Co2(H2O)5(pdc)2]·2H2O (1) that pdc2− is pyridine-2,6-dicarboxylato has been synthesized under hydrothermal condition and sonochemical irradiation. Depending on the synthetic conditions, different morphology has been obtained for complex 1. Complex 1 hydrothermal (hc) which obtained as single crystal is a micro-structured compound and was characterized by single crystal X-ray diffraction. Complex 1 ultrasound (uc) is a nano-structured compound and obtained as precipitate. Structural comparison of hc and uc by Fourier-transform infrared spectroscopy (FT-IR), powder X-ray diffraction, and scanning electron microscopy (SEM) revealed that both synthesized complexes have the same structure with different particles size and morphology. In this study, a new synthetic route has been developed to prepare Co3O4 nanoparticles for environmental catalytic applications. Effective sorbents Co3O4-hc and Co3O4-uc were prepared by thermolysis of dinuclear cobalt complexes and characterized by FT-IR, SEM, XRD, and Brunauer–Emmett–Teller specific surface area. Co3O4-hc and Co3O4-uc were used as nano-sorbents for the removal Pb(II) from aqueous solution. Detailed sorption studies showed that both synthetic sorbents are valuable to remove Pb(II) from wastewater. The effective catalytic performance of the as-prepared sorbents can be attributed to the physicochemical features of synthetic catalysts, such as mesoporous nature, homogenous dispersion of the active phase, small particle size and high surface area. The effects of contact time, pH, Pb(II) and adsorbent dosage to remove Pb(II) were investigated. Maximum adsorption percent of Co3O4-hc and Co3O4-uc at room temperature were found to be 90 and 92.2%, respectively. The selectivity of the as-prepared catalysts toward metal ions Pb(II), Co(II), Cr(III), Cu(II), Fe(II), Hg(II), Mn(II) and Ni(II) exhibited that Co3O4 catalysts have the highest selectivity toward Pb(II). Also, the synthetic catalysts Co3O4-hc and Co3O4-uc showed an excellent cycling performance for Pb(II) removal up to 85.3 and 83.4% recovery over five cycles.

Using three-dimensional poly (vinyl alcohol)/sodium hexametaphosphate nanofiber as a non-toxic and efficient nanosorbent for extraction and recovery of Lanthanide ions from aqueous solutions

In the present study, the novel poly (vinyl alcohol)/sodium hexametaphosphate hydrogel electrospun nanofiber (PVA/SHMP HENF) with three-dimensional structure was fabricated by electrospinning strategy in one step. The crosslinking reaction was performed by thermal treatment using citric acid (CA) as a crosslinking agent. The full swelling in water nanofiber with high pH stability, nanofibrous and porous morphology showed remarkable adsorption capacity for La 3+ , Tb 3+ , and Nd 3+ . The quantification of Lanthanides ions (Ln 3+ ) was performed by inductively coupled plasma optical emission spectroscopy (ICP-OES). The morphology, porosity, and structure of electrospun nanofiber were surveyed and the possible mechanism for adsorption of Ln 3+ on the surface of the adsorbent was predicted. The effect of contact time, solution pH and initial concentration on adsorption capacity has been evaluated systematically. At pH 6, the adsorption performance was fitted well with the Langmuir isothermal and Pseudo-second order models, and the maximum adsorption capacity for La 3+ , Tb 3+ and Nd 3+ were 181.82, 243.90, 217.39 mg g −1 , respectively. The recovery of elements from adsorbent was performed by HCl 2 M. The outcome of this study suggested a non-toxic, economical, stable, efficient and novel adsorbent with three dimensional structure for the extraction and recovery of Ln 3+ from aqueous solutions. • The novel PVA/SHMP HENF was fabricated in a green solvent successfully. • The nanofiber was synthesized from a single fluid by electrospinning technique. • The hydrogel nanofiber with a 3D structure showed a high absorption capacity for Ln 3+ . • PVA/SHMP HENF was suggested as a highly efficient and recyclable adsorbent.

Remediation of Co/Zn ions and their 60Co/65Zn radioactive nuclides from aqueous solutions by acid activated nanobentonite

In this work, nanobentonite clay has been activated with H2SO4 to produce (A-NBent) nanosorbent to increase its adsorption efficiency toward divalent Co/Zn and their radionuclides60Co/65Zn via batch and column techniques. A-NBent was characterized by the FT-IR, TGA, XRD, SEM, and HR-TEM studies. The HR-TEM analysis confirmed particle size in the range between 11.37–19.78 nm. The adsorptive efficiency of A-NBent was evaluated by divergent parameters as pH, reaction time, solid amount and ionic concentration to obtain the perfect conditions. The adsorption isotherms and kinetic studies were investigated via different models and the kinetic of adsorption process was favorable by the pseudo-second order model. A-NBent nanosorbent exhibited the highest ion capacities at pH 6–7 and reaction time 20−30 min for Co/Zn ions. It was concluded that A-NBent behaved as an efficient nanosorbent for Co/Zn ions from aqueous solution, with maxima removal 125.27 mg/g for Co and 142.18 mg/g for Zn. This behavior is referred to the high surface area of A-NBent nanosorbent (349.2 m²/g) and high number of the activated sites resulted by the activation process with H2SO4. Finally, the packed micro-column system with A-NBent nanosorbent was applied for remediation of 60Co/65Zn from nuclear wastewater and the recovery values were concluded > 90 %.

Application of Co3O4 nanoparticles as an efficient nano-sorbent for solid-phase extraction of zinc(II) ions

In this research, a solid-phase extraction (SPE) method based on application of cobalt oxide nanoparticles (Co3O4 NPs) as a novel nano-sorbent was developed for preconcentration and extraction of zinc(II) ions from various real samples followed by flame atomic absorption spectrometric (FAAS) detection. Co3O4 NPs were simply synthesized via a thermal treatment of cobalt hydroxide after a precipitation method, and its structure and morphological properties were studied by Fourier transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. The effect of various parameters influencing the extraction recovery of Zn(II) ion such as extraction time, pH, amount of the nano-sorbent, sample volume and elution conditions were studied and optimized. Applying optimum conditions for SPE procedure, the limit of detection was 0.25 ng mL‒1 and the calibration graph was linear in the concentration range of 0.4‒32 ng mL‒1 with a correlation coefficient of 0.9951. The method intra- and inter-day precisions, calculated by performing five replicates at the concentration level of 20 ng mL‒1, were obtained 2.3% and 2.6%, respectively. The applicability of the developed SPE-FAAS method was evaluated by its application for measuring zinc concentration in various samples including tap water, river water, well water, milk and powder milk samples, and the relative recoveries were obtained in the range of 94.5‒103.5% for the spiked samples.

Electrospun acrylonitrile butadiene styrene nanofiber film as an efficient nanosorbent for head space thin film microextraction of polycyclic aromatic hydrocarbons from water and urine samples

In the present study, acrylonitrile butadiene styrene (ABS) nanofiber film was fabricated on the aluminum foil via a one-step and facile electrospinning strategy. Thereafter, the fabricated film was utilized as a novel and efficient nanosorbent for headspace thin film microextraction (HS-TFME) of polycyclic aromatic hydrocarbons (PAHs). Some properties of the prepared nanofiber film like morphology, chemical structure, stability, wettability, and extraction efficiency were investigated systematically. The fabricated nanofiber films showed a large ratio of surface to volume, high stability, good hydrophobicity and porous fibrous structure; hence an excellent extraction performance has been achieved. The π-π and hydrophobic interactions play crucial roles in the tendency of PAHs towards fabricated nanosorbent. The effective parameters on the adsorption performance of the developed headspace thin film microextraction-gas chromatography-mass spectroscopy (HS-TFME-GC-MS) method were optimized. At the optimized conditions of the proposed method, a broad linearity range with high coefficient of determination (R2≥0.998) was obtained and the limit of detections (LODs) were in the range of 0.08–0.2 ng mL−1 for six PAHs. The developed HS-TFME-GC-MS method has been applied for the measurement of PAHs in drinking and industrial water samples and urine samples of a smoker and also a non-smoker with satisfactory recoveries in the range of 83–98%, with relative standard deviations (RSDs) lower than 8.8%. The proposed HS-TFME-GC-MS method demonstrated to be a sensitive, efficient, uncomplicated, cost-effective and rapid approach, which can be introduced to analyze trace amounts of PAHs in various samples.

Molybdenum Trioxide: Efficient Nanosorbent for Removal of Methylene Blue Dye from Aqueous Solutions.

Nano Molybdenum trioxide (α-MoO3) was synthesized in an easy and efficient approach. The removal of methylene blue (MB) in aqueous solutions was studied using this material. The effects of various experimental parameters, for example contact time, pH, temperature and initial MB concentration on removal capacity were explored. The removal of MB was significantly affected by pH and temperature and higher values resulted in increase of removal capacity of MB. The removal efficiency of Methylene blue was 100% at pH = 11 for initial dye concentrations lower than 150 ppm, with a maximum removal capacity of 152 mg/g of MB as gathered from Langmuir model. By comparing the kinetic models (pseudo first-order, pseudo second-order and intraparticle diffusion model) at various conditions, it has been found that the pseudo second-order kinetic model correlates with the experimental data well. The thermodynamic study indicated that the removal was endothermic, spontaneous and favorable. The thermal regeneration studies indicated that the removal efficiency (99%) was maintained after four cycles of use. Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM) confirmed the presence of the MB dye on the α-MoO3 nanoparticles after adsorption and regeneration. The α-MoO3 nanosorbent showed excellent removal efficiency before and after regeneration, suggesting that it can be used as a promising adsorbent for removing Methylene blue dye from wastewater.

A poly(4-nitroaniline)/poly(vinyl alcohol) electrospun nanofiber as an efficient nanosorbent for solid phase microextraction of diazinon and chlorpyrifos from water and juice samples.

4-Nitroaniline was electropolymerized in a weakly alkaline medium, and the resulting poly(4-nitroaniline) (P4-NA)) was used to fabricate - by electrospinning - a nanofiber consisting of P4-NA and poly(vinyl alcohol) (PVA). ThePVA fractionwas then dissolved in hot water and this causes the porosity of electrospun nanofiber to be largely enhanced. The resulting nanofiber was utilized as a sorbent for solid phase microextraction of the model organophosphorus pesticides diazinon and chloropyrifos from aqueous media. The extracted analytes were then analyzed by corona discharge ion mobility spectrometry (CD-IMS). Under the optimized conditions, the limits of detection (at S/N = 3; for n = 10) are 0.4 and 0.6ngmL-1 for diazinon and chloropyrifos, respectively. The relative standard deviations at the levels of 25, 50 and 100ngmL-1 (for n = 3) ranged from 4.0-12.3% (both intra-day and inter-day). Eventually, the method was used to analyze different water samples, including spiked drinking water, sea water, lagoon water, and groundwater sample in the proximity of rice fields, and in two juice samples. Recoveries ranged between 82 and 102%. Graphical abstract An electrospun nanofiber consisting of highly porous poly(4-nitroaniline) was synthesized and used as a sorbent for solid phase microextraction of diazinon and chlorpyrifos from water and juice samples prior to quantitation bycorona discharge ion mobility spectrometry.

Crossed mixture‐process design for optimization of simultaneous adsorption of Tartrazine and Indigo carmine dyes by cobalt hydroxide nanosorbent

AbstractThe present paper focused on the removal of Tartrazine and indigo carmine from aqueous solutions by cobalt hydroxide nanosorbent. This novel and efficient nanosorbent were successfully used to remove two anionic dyes from aqueous solutions in single and binary systems. The characterization of sorbent was carried out with scanning electron microscopy micrographs, X‐ray diffraction, and Fourier transform infrared spectroscopy analysis. The simplex‐lattice mixture design was employed for optimization of adsorption process. The effective factors on adsorption such as pH, m (amount of sorbent), and C (initial concentrations of dyes) were considered using crossed mixture‐process design. The proposed quadratic model resulted from the mixture design approach fitted very well to the experimental data. Isotherm modeling and kinetic investigations showed that sips, modified sips, and pseudo‐second‐order models describe both the adsorption equilibrium and kinetic behavior well, respectively.

A new nano-sorbent for fast and efficient removal of heavy metals from aqueous solutions based on modification of magnetic mesoporous silica nanospheres

In the present study, a new and efficient nanosorbent for the fast removal of heavy metal ions was prepared. The proposed nanosorbent was fabricated using Fe3O4 magnetic core shelled by mesoporous silica, and cetyltrimethylammonium bromide (CTAB) as surfactant template through a sol-gel process. The magnetic nanomaterial was further modified with bis(3-triethoxysilylpropyl)tetrasulfide (MSCMNPs-S4). The final nanosphers were characterized by FT-IR, XRD, TGA, BET, SEM, TEM, DLS, VSM, EDX, and UV–Vis. The potential of the resultant mesoporous magnetite nanomaterials was investigated as a convenient and effective adsorbent for the removal of toxic heavy metal ions from aqueous solutions in a batch system. The effect of essential parameters on the removal efficiency including initial pH of sample solution, adsorbent amount, metal ion concentration, contact time and type and quantity of the eluent on the adsorption characteristics of the MSCMNPs-S4 were studied. Under the optimized conditions, the proposed nanosorbent exhibited high adsorption capacity of 303.03, 256.41 and 270.27mgg−1 and maximum removal percentages of 98.8%, 96.4%, 95.7% for Hg(II), Pd(II) and Pb(II) ions, respectively. The mechanism of the adsorbtion was found to be in good agreement with the Langmuir isotherm model. Furthermore, the reusability investigation indicated that the MSCMNPs-S4 could be used frequently at least for five cycles without any significant loss in its performance.

Fast sono assisted ferrofluid mediated silver super – Adsorption over magnesium ferrite-copper sulfide chalcogenide with the aid of multivariate optimization

This research focuses on the development of a fast ultrasonic assisted ferrofluid mediated methodology to obtain the optimum conditions for silver adsorption from aqueous solutions. For this purpose magnesium ferrite-copper sulfide chalcogenide was synthesized and employed as an efficient nanosorbent. The sorbent was characterized with energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD) and vibrational sample magnetometry (VSM) techniques. For obtaining the optimal operating conditions of silver adsorption, response surface methodology (RSM) was used. Tests were performed by Box-Behnken design (BBD). The value of optimum conditions for silver adsorption include pH=2.5, adsorbent dosage=10.0mg, sonicating time=1min and ionic strength=2.2%. According optimum conditions, percentage of removal should be 99.34%. With replication of similar experiment (n=6) average percentage of 100±0.95% was obtained for Ag+ adsorption which shows good agreement between predicted and experimental results. Silver ion adsorption follow Langmuir model with maximum sorption capacity of 2113mgg−1. Ultrasonic power helped to prepare ferrofluid and demonstrated that had an important role in better dispersing of it in solution and efficient adsorption of analyte.