Personal Research Database

Full Text: 2010\Sep Sci Tec45, 277.pdf

Abstract: Competitive adsorption of Ag⁺, Pb²⁺, Ni²⁺, and Cd-2 ions on vermiuculite in a binary, ternary, and quaternary mixture was investigated in batch experiments. The effects of the presence of Ag⁺, Ni²⁺, and Cd²⁺ ions on the adsorption of Pb²⁺ ions were investigated in terms of the equilibrium isotherm. Experimental results indicated that Pb²⁺ ions always favorably adsorbed on vermiculite over Ag⁺, Ni²⁺, and Cd²⁺ ions. The adsorption equilibrium data of Pb²⁺ ions better fitted the Langmuir model than the Freundlich model. The results showed that the pseudo-second-order kinetics model was in good agreement with the experimental results for all metal ions, and the adsorption rate among the metal ions followed Ag⁺ > Pb²⁺ > Ni²⁺ > Cd²⁺. The desorption and regenration study indicated that vermiculite can be used repeatedly and be suitable for the design of a continuous process.

Keywords: Adsorption, Adsorption Equilibrium, Adsorption Rate, Aqueous-Solutions, Batch, Batch Experiments, Cadmium, Carbon, Cd²⁺, Competitive Adsorption, Cu²⁺, Data, Design, Desorption, Equilibrium, Equilibrium Isotherm, Experimental, Experiments, Fly-Ash, Freundlich, Freundlich Model, Hydroxyaluminosilicate-Montmorillonite Complexes, Ions, Isotherm, Kinetics, Kinetics Model, Langmuir, Langmuir Model, Lead, Metal, Metal Ion, Metal Ions, Metal Removal, Model, Ni²⁺, Pb²⁺, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Sorption, Vermiculite, Waste-Water

? Tayyebi, A., Khanchi, A., Ghofrani, M.B. and Outokesh, M. (2010), synthesis and characterization of a bentonite-alginate microspherical adsorbent for removal of uranyl ions from aqueous solutions. Separation Science and Technology, 45 (2), 288-298.

Full Text: 2010\Sep Sci Tec45, 288.pdf

Abstract: A novel microspherical adsorbent for the removal of uranium from aqueous solutions was developed by immobilizing of natural bentonite in the polymeric matrix of calcium alginate. Different uptake properties of the prepared microspheres were examined using batch, stirred and column methods. The adsorbent showed high affinity toward uranium ions, especially at pHs above 3. Major uptake mechanisms included ion exchange, chelating of the (UO₂)²⁺ ions to the -OH groups of alginate, and surface complexation with bentonite. Surprisingly, the capacity of microspheres was higher than both its constituents, revealing that a synergetic effect occurs. Adsorption kinetics was controlled by slow chemical reaction of UO₂²⁺ ions with bentonite, and it obeyed a shrinking core model. Also a pseudo-second order chemical reaction fairly fitted the kinetics data. The synthesized microsphrese, in addition to cost efficiency, showed a relatively good column performance and high durability and reusability.

Keywords: Adsorbent, Adsorption, Adsorption Kinetics, Alginate, Alginate Microspheres, Aqueous Solutions, Batch, Bentonite, Biopolymer, Biosorption, Calcium, Calcium Alginate, Capacity, Characterization, Chemical, Column, Complexation, Cost, Cost-Efficiency, Data, Efficiency, Equilibrium, Exchange, Extraction, Ion Exchange, Ion-Exchange, Ions, Kinetics, Matrix, Mechanisms, Methods, Microspheres, Model, Natural, Performance, Phosphoric-Acid, Polymeric, Pseudo Second Order, Pseudo-Second Order, Pseudo-Second-Order, Removal, Reusability, Selectivity, Solutions, Sorption, Surface, Surface Complexation, Synergetic Effect, Synthesis, Trivalent, UO₂²⁺, Uptake, Uranium

? Chang, C.C., Huang, Y.H. and Chen, H.T. (2010), Adsorption thermodynamic and kinetic studies of fluoride aqueous solution treated with waste iron oxide. Separation Science and Technology, 45 (3), 370-379.

Full Text: 2010\Sep Sci Tec45, 370.pdf

Abstract: This study uses a waste iron oxide material (BT3), which is a by-product of the fluidized-bed Fenton reaction (FBR-Fenton), for the treatment of a fluoride (F^-) solution. The purpose of this study is to investigate a low-cost sorbent as a replacement for the current costly methods of removing fluoride from wastewater. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) are used to characterize the BT3. Contact time, F^- concentration (from 0.75 to 6mmol L^-1), and temperature (from 303 to 323K) are used as operation parameters to treat the fluoride. The highest F^- adsorption capacity of the BT3 adsorbent was determined to be 1.17mmol g-1 (22.2mg g^-1) for a 6mmol L^-1 initial F^- concentration at pH 3.9±0.2 and 303±1K. Adsorption data were well described by the Langmuir model, and the thermodynamic constants of the adsorption process, Gº, Hº, and Sº, were evaluated as -1.63kJ mol^-1 (at 303K), -1.75kJ mol^-1, and -52.4J mol^-1 K^-1, respectively. Additionally, a pseudo-second-order rate model was adopted to describe the kinetics of adsorption. BT3 could be regenerated with NaOH, and the regeneration efficiency reached 95.1% when the concentration of NaOH was 0.05mol L^-1.

Keywords: Activated Alumina, Adsorbent, Adsorption, Adsorption Capacity, Capacity, Catalytic-Oxidation, Coated Sand, Concentration, Data, Donnan Dialysis, Drinking-Water, Efficiency, Electron Microscopy, Equilibrium, F, Fenton, Fluidized Bed, Fluidized-Bed Reactor, Fluoride, Ions, Iron, Iron Oxide, Iron-Oxide, Kinetic, Kinetics, Kinetics of Adsorption, L1, Langmuir, Langmuir Model, Low Cost, Low-Cost Materials, Methods, Model, NaOH, Operation, Oxide, pH, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Rate, Purpose, Regeneration, Removal, Scanning Electron Microscopy, SEM, Solution, Sorbent, Temperature, Thermodynamic, Treatment, Waste, Wastewater, X-Ray, XRD

? Ahmad, R. and Mondal, P.K. (2010), Application of modified water nut carbon as a sorbent in Congo red and Malachite green dye contaminated wastewater remediation. Separation Science and Technology, 45 (3), 394-403.

Full Text: 2010\Sep Sci Tec45, 370.pdf

Abstract: Batch and column adsorption experiments were conducted to investigate the removal of dyes from wastewater by water nut modified carbon (WNMC). Acidic pH was favorable for adsorption for Congo red dyes and basic pH was favorable for the adsorption for Malachite green dyes. The surface property of the sorbent was characterized by scanning electron microscopy and Fourier transform infrared techniques. The adsorption process was found to be endothermic and spontaneous. Different models of adsorption were used to describe the kinetics data and to calculate the corresponding rate constants of WNMC surfaces for dyes adsorption. A mechanism of dyes adsorption associating chemisorption processes is presented allowing the discussion of the variations in adsorption behavior of the material. These data suggested that WNMC are promising materials for dyes sorption. The data were in good agreement with bed depth service time model.

Keywords: Activated Carbons, Adsorption, Adsorption Behavior, Adsorption Characteristics, Aqueous-Solution, BDST, Behavior, Breakthrough Capacity, Carbon, Characterization, Chemisorption, Column, Congo Red, Data, Decolorization, Dye, Dyes, Electron Microscopy, Endothermic, Experiments, Fixed Bed Column, Kinetics, Kinetics, Malachite Green, Mechanism, Metal-Ions, Methylene-Blue, Model, Models, Modified, Modified Carbon, pH, Phosphoric-Acid, Property, Rate Constants, Remediation, Removal, Removal of Dyes, Scanning Electron Microscopy, Service, Sorbent, Sorption, Surface, Surfaces, Techniques, Wastewater, Water, WNMC

? Sari, A. and Tuzen, M. (2010), Biosorption of As(III) and As(V) from aqueous solution by lichen (Xanthoria parietina) biomass. Separation Science and Technology, 45 (4), 463-471.

Full Text: 2010\Sep Sci Tec45, 463.pdf

Abstract: The biosorption of As(III) and As(V) from aqueous solution on lichen (Xanthoria parietina) biomass were investigated using different experimental parameters such as solution pH, biomass concentration, contact time, and temperature. The equilibrium data were evaluated by Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models. The biosorption capacity of X. parietina for As(III) and As(V) was found to be 63.8mg/g and 60.3mg/g. The mean sorption energy values calculated from D-R model indicated that the biosorption of As(III) and As(V) onto X. parietina biomass took place by chemical ion-exchange. The thermodynamic parameters showed that the biosorption of As(III) and As(V) ions onto X. parietina biomass was feasible, spontaneous, and exothermic in nature. Kinetic examination of the sorption data revealed that the biosorption processes of both As(III) and As(V) followed well the pseudo-second-order kinetics. The arsenic ions were desorbed from X. parietina using both 1M HCl and 1M HNO₃. The recovery yield of arsenic ions was found to be 80-90% and the biosorbent had good reusability after consecutive seven sorption-desorption cycles.

Keywords: Accumulation, Activated Carbon, Adsorptive Removal, Aqueous Solution, Arsenic, Arsenic Ions, Arsenic Removal, As(III), As(V), Biomass, Biomonitor, Biosorbent, Biosorption, Capacity, Chemical, Cladonia-Furcata, Concentration, Data, Drinking-Water, Energy, Equilibrium, Examination, Exothermic, Experimental, Filtration, Freundlich, Hypogymnia-Physodes, Ion Exchange, Ion-Exchange, Ionexchange, Ions, Isotherm, Kinetic, Kinetics, Langmuir, Model, Models, pH, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Recovery, Solution, Sorption, Sorption-Desorption, Temperature, Thermodynamic, Thermodynamic Parameters, Thermodynamics, Xanthoria Parietina

? Biswas, K., Debnath, S. and Ghosh, U.C. (2010), Physicochemical aspects on fluoride adsorption for removal from water by synthetic hydrous iron(III)-chromium(III) mixed oxide. Separation Science and Technology, 45 (4), 472-485.

Full Text: 2010\Sep Sci Tec45, 472.pdf

Abstract: Fluoride removal with varying different parameters at 303±1.6K and pH 6.5±0.2 was investigated by hydrous iron(III)-chromium(III) bimetal oxide. The kinetic and equilibrium data fitted with the pseudo-second order and Langmuir isotherm equations very well (R²=0.99-1.00), respectively. The Langmuir capacity and free energy (EDR) of adsorption evaluated were 16.34 (±0.50) mg center dot g-1 and 15.81kJ center dot mol^-1, respectively. The estimated thermodynamic parameters viz. H₀, G₀, and S₀ indicated that the reaction was endothermic but spontaneous for entropy increase. The small-scale column filtration of high fluoride (C₀=7.37mg center dot L^-1) water gave encouraging results.

Keywords: Adsorption, Alumina, Aqueous-Solution, Capacity, Carboxylated Chitosan Beads, Column, Data, Defluoridation, Desorption, Drinking-Water, Endothermic, Energy, Entropy, Equilibrium, Filtration, Fixed-Bed, Fluoride, Fluoride Removal, Iron-Chromium Mixed Oxide, Isotherm, Isotherm Equations, Kinetic, Kinetics, Kinetics, L1, Langmuir, Langmuir Isotherm, Low-Cost Materials, Oxide, pH, Pseudo Second Order, Pseudo-Second Order, Pseudo-Second-Order, Removal, Sorption, Thermodynamic, Thermodynamic Parameters, Thermodynamics, Water

? Kamari, A. and Ngah, W.S.W. (2010), Adsorption of Cu(II) and Cr(VI) onto treated shorea dasyphylla bark: Isotherm, kinetics, and thermodynamic studies. Separation Science and Technology, 45 (4), 486-496.

Full Text: 2010\Sep Sci Tec45, 486.pdf

Abstract: The efficacy of treated Shorea dasyphylla bark for Cu(II) and Cr(VI) adsorption was assessed in a batch adsorption system as a function of pH, agitation period, and initial metal concentration. The equilibrium nature of Cu(II) and Cr(VI) adsorption was described by the Freundlich, Langmuir, and Dubinin-Radushkevich isotherms. The maximum monolayer capacities of treated Shorea dasyphylla bark, estimated from the Langmuir equation were 184.66 and 42.72mg/g for Cu(II) and Cr(VI), respectively. The experimental results were fitted using pseudo-first order, pseudo-second order and intraparticle diffusion kinetic models, the pseudo-second order showed the best conformity to the kinetic data. Thermodynamic parameters such as enthalpy change (Hº), free energy change (Gº) and entropy change (Sº) were determined by applying the Van’t Hoff equation. The adsorption of Cu(II) and Cr(VI) onto treated Shorea dasyphylla bark was found to be spontaneous and exothermic. The adsorption mechanism was confirmed by means of Fourier transform infrared (FTIR) and Energy dispersive X-ray (EDX) spectroscopy. The dimensionless constant separation factor (RL), indicated that treated Shorea dasyphylla bark was favorable for Cu(II) and Cr(VI) adsorption.

Keywords: Adsorption, Adsorption Mechanism, Agitation, Aqueous-Solution, Bark, Batch, Batch Adsorption, Chitosan, Chromium, Concentration, Cr(VI), Cr(VI) Adsorption, Cu(II), Data, Diffusion, EDX, Efficacy, Energy, Enthalpy, Entropy, Equilibrium, Exothermic, Experimental, Freundlich, FTIR, Function, Heavy-Metals, Intraparticle Diffusion, Ions, Isotherm, Isotherms, Kinetic, Kinetic Models, Kinetics, Langmuir, Langmuir Equation, Low-Cost Adsorbents, Mechanism, Metal, Models, Monolayer, pH, Pseudo First Order, Pseudo Second Order, Pseudo-First Order, Pseudo-First-Order, Pseudo-Second Order, Pseudo-Second-Order, Remediation, Removal, Sawdust, Separation, Sorption, Spectroscopy, Thermodynamic, Thermodynamic Parameters, Treated Bark, Waste-Water, X-Ray

? He, Z.Y., Christopher, B.W., Zhou, Y.T., Nie, H.L. and Zhu, L.M. (2010), Papain adsorption on chitosan-coated nylon-based immobilized metal ion (Cu²⁺, Ni²⁺, Zn²⁺, Co²⁺) Affinity Membranes. Separation Science and Technology, 45 (4), 525-534.

Full Text: 2010\Sep Sci Tec45, 525.pdf

Abstract: A novel immobilized metal affinity membrane was prepared for papain adsorption in this article. Higher papain adsorption capacity between 43-67 mg/g was observed and the adsorption isotherm fitted the Freundlich equation. Experimental data were analyzed using two adsorption kinetic models. The pseudo-second-order kinetic model provided better correlation to the experimental results. A significant amount of the adsorbed papain was eluted by 1.0M NaSCN at pH 5.0 for all affinity membranes. It was concluded that the novel chitosan-coated nylon-based immobilized metal ion affinity membrane could be applied for the large-scale isolation of papain without resulting in enzyme denaturation.

Keywords: Adsorption, Adsorption Capacity, Adsorption Isotherm, Adsorption Kinetic, Affinity Membrane, Aqueous-Solutions, Capacity, Cellulose, Chromatography, Co²⁺, Correlation, Cu²⁺, Data, Exchange, Experimental, Freundlich, Freundlich Equation, Immobilized, Isotherm, Kinetic, Kinetic Model, Kinetic Models, Kinetics, Lysozyme, Membrane, Metal, Metal Ion, Model, Models, Ni²⁺, Papain, pH, Protein, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Kinetic Model, Purification, Removal, Separation, Zn²⁺

? Wang, X.S., Huang, L.P., Li, Y., Chen, J., He, W. and Miao, H.H. (2010), Uptake of Cr (VI) by Sphingomonas paucimobilis biomass from aqueous solutions. Separation Science and Technology, 45 (5), 681-686.

Full Text: 2010\Sep Sci Tec45, 681.pdf

Abstract: The Sphingomonas paucimobilis biomass has been successfully utilized to degrade several persistent organic pollutants (POPs). However, few studies have been conducted to use it to remove heavy metals from aqueous solutions. In the present study, biosorption experiments for Cr (VI) were investigated using nonliving biomass of S. paucimobilis isolated from activated sludge, Lianyungang Dapu sewage treatment plant, China. The effects of several parameters including solution pH, contact time, and ionic strength, etc. on Cr (VI) uptake were studied. The biomass was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS) and Fourier transform infrared spectrometer (FTIR). The applicability of the Langmuir and Freundlich models was tested. The correlation coefficients (R) of both models were greater than 0.95. The maximum adsorption capacities were found to be 28.5mg/g for Cr (VI) at 20ºC. The adsorption process was quick and found to follow the pseudo-second-order equation. The optimum adsorption was achieved at pH 2. The adsorption was also NaCl concentrations dependent.

Keywords: Activated Sludge, Adsorption, Adsorption Capacities, Aqueous Solutions, Biomass, Biosorption, China, Correlation, Cr(VI), Cr(VI) Biosorption, Electron Microscopy, Energy, Experiments, Freundlich, FTIR, Heavy Metals, Ionic Strength, Langmuir, Metal-Ions, Metals, Models, NaCl, Organic, Organic Pollutants, Persistent Organic Pollutants, pH, Plant, Pollutants, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Equation, Scanning Electron Microscopy, Separation, Sewage, Sludge, Solution, Solutions, Spectroscopy, Sphingomonas paucimobilis Biomass, Strength, Treatment, Uptake, X-Ray

? Pompeu, D.R., Moura, F.G., Silva, E.M. and Rogez, H. (2010), Equilibria, kinetics, and mechanisms for the adsorption of four classes of phenolic compounds onto synthetic resins. Separation Science and Technology, 45 (5), 700-709.

Full Text: 2010\Sep Sci Tec45, 700.pdf

Abstract: The adsorption of five phenolic compounds of four different classes from aqueous batch solutions onto four styrene-divinylbenzene and acrylic resins (EXA 90, EXA 118, XAD 7, and XAD 16) was investigated regarding their equilibria, kinetics and surface-energy heterogeneity, and mechanisms of adsorption. The experimental equilibrium data were very well fitted to Langmuir and Freundlich models (R² 0.900). Three kinetic models (pseudo-first-order, pseudo-second-order, and an intra-particle diffusion model) were suitable for describing the experimental data, the pseudo-second-order kinetic model being the best one (p 0.001). The adsorption energy values were low (19.00 kJ/mol), suggesting a physical adsorption process. Driving forces involved in the adsorption of the phenolic compounds onto the resins were hydrogen bonding, - stacking and hydrophobic interactions.

Keywords: Adsorbents, Adsorption, Adsorption Isotherm, Adsorption Kinetics, Adsorption Mechanisms, Batch, Data, Diffusion, Diffusion Model, Energy, Equilibria, Equilibrium, Experimental, Extract, Flavonoids, Flavonoids, Freundlich, Hesperidin, Heterogeneity, Hydrogen, Hydrogen Bonding, Intra-Particle Diffusion, Intraparticle Diffusion, Intraparticle Diffusion Model, Kinetic, Kinetic Model, Kinetic Models, Kinetics, Langmuir, Macroporous Synthetic Resins, Mechanisms, Model, Models, Phenolic Acids, Physical, Pi-Stacking Interactions, Polyphenols, Pseudo First Order, Pseudo Second Order, Pseudo-First-Order, Pseudo-Second-Order, Pseudo-Second-Order Kinetic Model, Resins, Selective Adsorption, Solutions, Sorption, Surface Energy, Water, XAD Resins

? Selvakumar, R., Kavitha, S., Sathishkumar, M., Jayavignesh, V. and Swaminathan, K. (2010), Liquid phase separation of As(V) from aqueous solution using pretreated Paecilomyces variotii biomass. Separation Science and Technology, 45 (6), 776-785.

Full Text: 2010\Sep Sci Tec45, 776.pdf

Abstract: Biosorption of As(V) was carried out using Paecilomyces variotii biomass in batch and column mode experiments. Various pretreatments like autoclaving (APV), iron doping (FePV), and PVP K25 doping (PVPPV) of biomass were carried out to increase and compare the adsorption efficiency of As(V) onto the biomass. At maximum concentration of 2.5mg/L of As(V), the removal was observed to be 58.4, 51.29, and 47.7% with FePV, PVPPV, and APV biomass respectively. PVPPV required comparatively less time (135min) to attain equilibrium when compared to other adsorbents (165min). FePV showed higher As(V) adsorption capacity (Qo) of 1.563mg/L in batch mode. The batch mode data were analysed using Langmuir and Freundlich isotherms and first order and pseudo second-order kinetic models. The maximum removal was observed at pH 2 with FePV. In column mode experiments, the change in the flow rate and the bed volume affected the adsorption capacity of the adsorbent. FePV showed maximum adsorption of As(V) in column mode experiments also. The desorption experiments revealed that the adsorbents could be reused so that it can be a cost-effective adsorbent for As(V) removal from drinking water.

Keywords: Adsorbent, Adsorbents, Adsorption, Adsorption Capacity, Anions, Arsenic, Arsenic Removal, As(V), As(V) Adsorption, As(V) Removal, Batch, Batch And Column Mode, Batch Mode, Biomass, Biosorption, Capacity, Carbon, Column, Concentration, Cost-Effective, Data, Desorption, Drinking Water, Efficiency, Equilibrium, Experiments, First, First Order, Flow, Flow Rate, Freundlich, Fungal Biomass, Groundwater, Iron, Isotherms, Kinetic, Kinetic Models, Kinetics, Langmuir, Langmuir And Freundlich Isotherms, Metal-Ions, Mode, Models, Paecilomyces Variotii, pH, Pretreatments, Pseudo Second Order, Pseudo Second-Order, Pseudo-Second-Order, Pvp K25, Removal, Second Order, Second-Order, Separation, Volume, Waste-Water, Water

? Jimenez-Nunez, M.L., Solache-Rios, M. and Olguin, M.T. (2010), Fluoride sorption from aqueous solutions and drinking water by magnesium, cobalt, and nickel hydrotalcite-like compounds in batch and column systems. Separation Science and Technology, 45 (6), 786-793.

Full Text: 2010\Sep Sci Tec45, 786.pdf

Abstract: Magnesium, nickel, and cobalt hydrotalcite-like compounds (MgAlHT, NiAlHT, and CoAlHT) were used to remove fluoride ions from aqueous solutions and drinking water in batch and column systems. Mg, Ni, and Co hydrotalcite like compounds with similar M²⁺:Al³⁺ ratios were synthesized. F^- ions were determined in the remaining solutions using a fluoride ion selective electrode. Kinetic of the fluoride sorption from aqueous solutions by hydrotalcite-like compounds (HT) was best described by the pseudo-second-order model and the equilibrium was reached in less than 200 minutes for all cases (MgAlHT, NiAlHT and CoAlHT), however, this behavior was not observed for fluoride sorption from drinking water by NiAlHT. The sorption isotherms of the fluoride ion by hydrotalcite like compounds could be best fitted to the Langmuir and Freundlich models. NiAlHT showed the highest efficiency for the removal of fluoride ions from aqueous solutions in batch system. The removal of fluoride ions by NiAlHT from aqueous solutions was more efficient than from drinking water in both batch and column systems.

Keywords: Adsorption, Anionic Clays, Aqueous Solutions, Batch, Batch System, Behavior, Cadmium, Co, Cobalt, Column, Defluoridation, Drinking Water, Efficiency, Effluents, Equilibrium, F, Fixed-Bed Column, Fluoride, Fluoride Ion, Freundlich, Hydrotalcite, Hydrotalcite-Like Compounds, Ion Selective Electrode, Ions, Isotherms, Kinetic, Langmuir, Lead(II), Magnesium, Model, Models, Nickel, Oxides, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Model, Removal, Selective, Solutions, Sorption, Sorption Isotherms, Systems, Water

? Yang, J.S., Lee, J.Y., Park, Y.T., Baek, K. and Choi, J. (2010), Adsorption of As(III), As(V), Cd(II), Cu(II), and Pb(II) from aqueous solutions by natural muscovite. Separation Science and Technology, 45 (6), 814-823.

Full Text: 2010\Sep Sci Tec45, 814.pdf

Abstract: Various parameters were tested for the application of natural muscovite (NM) in the removal of metals from aqueous solutions: contact time, pH, ionic strength, and initial metal concentrations. Kinetic studies showed that the pseudo-second-order model explains well the sorption process. The adsorption of metals was greatly influenced by solution pH but not by ionic strength. The results from isotherm studies agreed more with the Freundlich isotherm model than with the Langmuir isotherm model. The adsorbed quantity of metals by NM was lower than that by the purified mica. These results suggested that the composition and surface characteristics of natural minerals may seriously influence applications for water purification.

Keywords: (001)-Solution Interface, 001 Surface, Adsorbent, Adsorbents, Adsorption, Adsorption of Metals, Application, Aqueous Solutions, Arsenic, As(III), As(V), Cd(II), Characteristics, Complexes, Composition, Cu(II), Freundlich, Freundlich Isotherm, Freundlich Isotherm Model, Heavy-Metal-Adsorption, Ionic Strength, Ions, Isotherm, Isotherm Model, Kinetic, Kinetic Studies, Langmuir, Langmuir Isotherm, Langmuir Isotherm Model, Metal, Metals, Mica, Mica, Minerals, Model, Natural, Nm, Pb(II), pH, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Model, Purification, Removal, Solution, Solutions, Sorption, Sorption Process, Strength, Surface, Thermodynamics, Water, Water Interface, Water Purification

? Zhao, Y.F., Zhang, B., Zhang, Y.W., Wang, J.H., Liu, J.D. and Chen, R.F. (2010), Removal of ammonium from wastewater by pure form low-silica zeolite y synthesized from halloysite mineral. Separation Science and Technology,