Personal Research Database

Full Text: 2009\J Haz Mat170, 1197.pdf

Abstract: Titanium dioxide nanoparticles were employed for the sorption of selenium ions from aqueous solution. The process was studied in detail by varying the sorption time, pH. and temperature. The sorption was found to be fast, and to reach equilibrium basically within 5.0 min. The sorption has been optimized with respect to the pH, maximum sorption has been achieved from solution of pH 2-6. Sorbed Se(IV) and Se(VI) were desorbed with 2.0 mL 0.1 mol L^-1 NaOH. The kinetics and thermodynamics of the sorption of Se(IV) onto Nano-TiO₂ have been studied. The kinetic experimental data properly correlate with the second-order kinetic model (k(2) = 0.69 g mg^-1 min^-1, 293 K). The overall rate process appears to be influenced by both boundary layer diffusion and intraparticle diffusion. The sorption data could be well interpreted by the Langmuir sorption isotherm. The mean energy of adsorption (14.46 kJ mol^-1) was calculated from the Dubinin-Radushkevich (D-R) adsorption isotherm at room temperature. The thermodynamic parameters for the sorption were also determined, and the H° and G° values indicate exothermic behavior. (C) 2009 Published by Elsevier B.V.

Keywords: Adsorption, Adsorption Isotherm, Aqueous, Cd(II), Diffusion, Elsevier, Equilibrium, Hematite, Intraparticle Diffusion, Isotherm, Kinetic, Kinetic-Spectrophotometric Determination, Kinetics, Nano-TiO₂, Nanoparticles, pH, Preconcentration, Removal, Rice Husk, Se(IV), Second Order, Selenium, Sorption, Sorption Isotherm, Temperature, Thermodynamic, Thermodynamic Parameters, Thermodynamics, Water

? El-Bayaa, A.A., Badawy, N.A. and AlKhalik, E.A. (2009), Effect of ionic strength on the adsorption of copper and chromium ions by vermiculite pure clay mineral. Journal of Hazardous Materials, 170 (2-3), 1204-1209.

Full Text: 2009\J Haz Mat170, 1204.pdf

Abstract: It is important to assess the effects of ionic strength when studying adsorption of metal ions on clay mineral because the background salt may complex metals and compete for adsorption sites. The sorption behavior of vermiculite pure clay mineral has been studied with respect to copper and chromium as a function of ionic strength in single metal ion solutions. Background electrolytes used in these experiments were KCl, NaCl and NH₄Cl. The studies were conducted by a batch method at temperature 25°C. The adsorption capacity and adsorption energy for each metal ion were calculated from the Langmuir adsorption isotherm. Also the competitive adsorption behavior of some heavy metal ions such as Cr(III), Cu(II). Ni(II) and Co(II) by vermiculite pure clay mineral was studied. The result shows the competition between coexisting heavy metal cations for the same adsorption sites of an adsorbent. However, when trivalent metal was added to the solution it competitively replaced divalent ions that had been previously adsorbed onto the vermiculite pure clay mineral, resulting in the desorption of these metals into the solution. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorption, Adsorption Behavior, Adsorption Capacity, Adsorption Isotherm, Aqueous-Solution, Batch, Batch Method, Behavior, Capacity, Chromium, Chromium Ions, Clay, Clay Mineral, Co(II), Competition, Competitive, Competitive Adsorption, Copper, Cr(III), Cu(II), Desorption, Distribution Coefficient, Energy, Equilibrium, Experiments, Function, Heavy Metal, Heavy Metal Ions, Heavy Metals, Heavy-Metals, Ionic Strength, Ions, Isotherm, Kaolinite, KCl, Langmuir, Langmuir Adsorption Isotherm, Metal, Metal Ion, Metal Ions, Metals, Montmorillonite, NaCl, Ni(II), Pb(II), Removal, Rights, Salt, Solution, Solutions, Sorption, Strength, Temperature, Vermiculite, Waste-Water

? Gutiérrez-Segura, E., Solache-Ríos, M. and Colín-Cruz, A. (2009), Sorption of indigo carmine by a Fe-zeolitic tuff and carbonaceous material from pyrolyzed sewage sludge. Journal of Hazardous Materials, 170 (2-3), 1227-1235.

Full Text: 2009\J Haz Mat170, 1227.pdf

Abstract: Indigo carmine removal from aqueous solution has been evaluated using Fe-zeolitic tuff and carbonaceous material from pyrolyzed sewage sludge treated with HCl (CM). The adsorbents were characterized by scanning electron microscopy, BET surface area and X-ray diffraction. Sorption kinetics and isotherms were determined and the adsorption behaviors analyzed. Kinetic pseudo-second order and Langmuir-Freundlich models were successfully applied to the experimental results obtained with the Fe-zeolitic material, while kinetic first order and Langmuir-Freundlich models were applied to the results from the carbonaceous materials. This indicates mechanisms of chemisorption and physic sorption, respectively, on the heterogeneous materials. The results indicate that the carbonaceous material from the pyrolysis of sewage sludge (sorption capacity 92.83 mg/g) is a better adsorbent of indigo carmine than the zeolitic material (sorption capacity 32.83 mg/g). (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorbents, Adsorption, Aqueous Solution, Aqueous-Solution, BET, BET Surface Area, Capacity, Carbonaceous Material, Carbonaceous Materials, Chemisorption, Clinoptilolite-Rich Tuff, Decolorization, Degradation, Dye, Electron Microscopy, Experimental, Fe-Zeolitic Tuff, First, First Order, Indigo, Ions, Isotherms, Kinetic, Kinetics, Langmuir-Freundlich, Mechanisms, Models, Preferential Flow, Pseudo Second Order, Pseudo-Second Order, Pseudo-Second-Order, Pyrolysis, Removal, Rights, Scanning Electron Microscopy, Sewage, Sewage Sludge, Sludge, Solution, Sorption, Sorption Capacity, Sorption Kinetics, Surface, Surface Area, Waste-Water, X-Ray, X-Ray Diffraction

? Bansal, M., Singh, D. and Garg, V.K. (2009), A comparative study for the removal of hexavalent chromium from aqueous solution by agriculture wastes’ carbons. Journal of Hazardous Materials, 171 (1-3), 83-92.

Full Text: 2009\J Haz Mat171, 83.pdf

Abstract: This paper reports the feasibility of using agricultural waste and timber industry waste carbons to remove Cr(VI) from synthetic wastewater under different experimental conditions. For this, rice husk and saw dust have been used as adsorbent after sulphuric acid treatment. Effect of various process parameters, namely, pH, adsorbent dose, initial chromium concentration and contact time has been studied in batch systems. Maximum metal removal was observed at pH 2.0. The efficiencies of rice husk carbon (RHC) and saw dust carbon (SDC) for Cr(VI) removal were 91.75% and 94.33%, respectively for aqueous solutions (250 mg L^-1) at 20 g L^-1 adsorbent dose. The experimental data was analyzed using Freundlich, Langmuir, Dubinin-Redushkevich (D-R) and Temkin isotherm models. It was found that Langmuir, D-R and Temkin models fitted well. The results revealed that the hexavalent chromium is considerably adsorbed on RHC and SDC and it could be an economical method for the removal of hexavalent chromium from aqueous systems. FTIR and SEM of the adsorbents were recorded in native and Cn(VI)-loaded state to explore the number and position of various functional groups available for Cr(VI) binding onto studied adsorbents and changes in adsorbent surface morphology. The surface area of RHC and SDC was 1.12 and 1.16 m² g^-1 respectively. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorbents, Adsorption, Adsorption, Aqueous, Biosorption, By-Products, Carbon, Chromium, Chromium(VI), Cr(VI) Reduction, Elsevier, Equilibrium, FTIR, Granular Activated Carbon, Groups, Hexavalent Chromium, Isotherm, Kinetics, Metal, Models, Nickel(II), pH, Removal, Rice Husk, Rice Husk Carbon, Saw Dust Carbon, Sem, Solutions, Sorption, Surface Area, Treatment, Wastewater

? Gylienė, O., Binkienė, R. and Butkienė, R. (2009), Sorption of Cu(II) complexes with ligands tartrate, glycine and quadrol by chitosan. Journal of Hazardous Materials, 171 (1-3), 133-139.

Full Text: 2009\J Haz Mat171, 133.pdf

Abstract: The sorption by chitosan in Cu(II) solutions containing tartrate, glycine (amino acetic acid) and quadrol (N,N,N’,N’-tetrakis(2-hydroxypropyl)ethylenediamine) as ligands has been investigated. The degree of sorbate removal strongly depends on pH. In solutions containing tartrate almost complete sorption of both Cu(II) and tartrate proceeds in mildly acidic and neutral solutions. The sorption of Cu(II) is also complete in alkaline Solutions containing glycine; meanwhile a substantial sorption of glycine proceeds at pH similar to 6. The Cu(II) sorption in solutions containing quadrol is insignificant. Any sorption of quadrol does not proceed in the whole range of pH investigated. The investigations under equilibrium conditions showed that the Cu(II) sorption from tartrate containing solutions obeys Freundlich equation and in solutions containing glycine and quadrol it fits Langmuir equation. Supposedly, Cu(II) sorption onto chitosan proceeds with formation of amino complexes onto the surface of chitosan: the sorption of tartrate proceeds as electrostatic as well as with formation of amide bonds. Applying of electrolysis enables a complete removal of sorbed Cu(II) and ligands without changes in physical and chemical properties of chitosan. This is confirmed by sorption ability of regenerated chitosan, measurements of its molecular weight, the deacetylation degree and FT-IR spectra. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Acids, Adsorption, Aqueous-Solutions, Chelating-Agents, Chitosan, Copper, Copper Complex, EDTA, Electrolysis, Elsevier, Equilibrium, FT-IR, FTIR, Glycine, Heavy-Metal Ions, Langmuir Equation, Ligands, pH, Regeneration, Regeneration Applying Electrolysis, Removal, Sewage-Sludge, Solutions, Sorption, Tartrate

? Nastasović, A., Sandić, Z., Suručić, L., Maksin, D., Jakovljević, D. and Onjia, A. (2009), Kinetics of hexavalent chromium sorption on amino-functionalized macroporous glycidyl methacrylate copolymer. Journal of Hazardous Materials, 171 (1-3), 153-159.

Full Text: 2009\J Haz Mat171, 153.pdf

Abstract: Two samples of macroporous crosslinked poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate), poly(GMA-co-EGDMA), with different porosity parameters were synthesized by suspension copolymerization and functionalized with ethylene diamine and diethylene triamine. The kinetics of Cr(VI) sorption by amino-functionalized poly(GMA-co-EGDMA) was investigated under non-competitive conditions. Competitive kinetics was studied from following multicomponent solutions: Cu(II) and Cr(VI); Cu(II), Co(II), Cd(II) and Ni(II): Cr(VI), Cu(II), Co(II) and Cd(II) solutions. Two kinetic models (the pseudo-first and pseudo-second-order) were used to determine the best-fit equation for the metals sorption by poly(GMA-co-EGDMA)-en and poly(GMA-co-EGDMA)-deta. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Amino-Functionalized, Aqueous-Solution, Cd(II), Chelating Resins, Chromium, Chromium Sorption, Co(II), Competitive, Copolymer, Copolymerization, Cr(VI), Cr(VI) Sorption, Cu(II), Ethylene Dimethacrylate, Glycidyl Methacrylate, Heavy-Metal Ions, Hexavalent Chromium, Kinetic, Kinetic Models, Kinetics, Macroporous, Metals, Models, Ni(II), NOV, Porosity, Porous Structure, Pseudo Second Order, Pseudo-First and, Pseudo-Second Kinetic Model, Pseudo-Second-Order, Reactive Polymers, Removal, Rights, Solutions, Sorption, Suspension, Textural Properties

? Unuabonah, E.I., Olu-Owolabi, B.I., Okoro, D. and Adebowale, K.O. (2009), Comparison of two-stage sorption design models for the removal of lead ions by polyvinyl-modified Kaolinite clay. Journal of Hazardous Materials, 171 (1-3), 215-221.

Full Text: 2009\J Haz Mat171, 215.pdf

Abstract: Kaolinite clay obtained from Ubulu-Ukwu, Delta State in Nigeria was modified with polyvinyl-alcohol (PVA) reagent to obtained PVA-modified Kaolinite clay. Kinetic and equilibrium data were obtained for the batch adsorption of Pb²⁺ onto PVA-modified Kaolinite clay. Time-dependent Langmuir and pseudo-second order kinetic models (TDLM and PSOM) were developed to predict the optimized minimum operating time for the adsorption of Pb²⁺ onto PVA-modified Kaolinite clay in a two-stage batch adsorber system. Results obtained suggest that the two-stage batch adsorber process leads to improved contact time and increased percentage Pb2+ removal. Data from both models (TDLM and PSOM) were compared using t-test and F-test and were found to be precise enough for use in the optimization of kinetic data for a two-stage adsorption of Pb²⁺ ions from aqueous solution. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Aqueous Solution, Batch, Batch Adsorption, Cadmium Ions, Clay, Data, Design, Equilibrium, Ions, Kaolinite, Kaolinite Clay, Kinetic, Kinetic Models, Langmuir, Lead, Minimize Contact Time, Minimum, Models, Modified, Nigeria, NOV, Optimization, Pb²⁺, Polyvinyl Alcohol, Pseudo Second Order, Pseudo-Second Order, Pseudo-Second-Order, Removal, Rights, Solution, Sorption, Two Stage Batch Adsorber, Two-Stage

? Zhao, D., Zhao, L., Zhu, C.S., Shen, X.Y., Zhang, X.Z. and Sha, B.F. (2009), Comparative study of polymer containing -cyclodextrin and -COOH for adsorption toward aniline, 1-naphthylamine and methylene blue. Journal of Hazardous Materials, 171 (1-3), 241-246.

Full Text: 2009\J Haz Mat171, 241.pdf

Abstract: Three different polymers P1, P2 and P3 (P1 containing both beta-CD and -COOH, P2 containing beta-CD and P3 containing -COOH) were synthesized and applied to adsorption toward aniline, 1-naphthylamine and methylene blue. The concentrations (C) before and after adsorption were determined and the adsorption capacities (q) of PI, P2 and P3 were calculated. The maximum adsorption capacities (q(max)) toward aniline: q(max) (P1) = 104 mol g^-1. q(max) (P2) = 14.9 mol g^-1 and q(max) (P3) = 53.1 mol g^-1; toward 1-naphthylamine: q(max) (P1) = 184 mu mol g^-1, q(max) (P2) = 53.8 mol g^-1 and q(max) (P3) = 125 mol g^-1; toward methylene blue: q(max) (P1)= 200 mol g^-1, q(max) (P2)= 12.7 mol g^-1 and q(max) (P3)= 215 mol g^-1. P1 exhibited remarkable adsorption toward all the three adsorbates. P2 was almost equal to P1 in adsorption toward methylene blue, but was less efficient than P1 in adsorption toward aniline and 1-naphthylamine. P3 also exhibited considerable adsorption toward aniline and 1-naphthylamine, but was inefficient toward methylene blue. P1 was obtained from nontoxic materials and through environment friendly procedures, so it was potentially an efficient and green adsorbent for water purification. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: 1-Naphthol, 1-Naphthylamine, Acid, Adsorbents, Adsorption, Aniline, Aqueous-Solution, Beta-Cyclodextrin, Beta-Cyclodextrin (Beta-Cd), Carboxyl Group (-COOH), Chemistry, Complexes, Dyes, Elsevier, Heavy-Metals, Methylene Blue, Polymer, Removal, Sorption, Water

? Vega, F.A., Covelo, E.F. and Andrade, M.L. (2009), The role of cation exchange in the sorption of cadmium, copper and lead by soils saturated with magnesium. Journal of Hazardous Materials, 171 (1-3), 262-267.

Full Text: 2009\J Haz Mat171, 262.pdf

Abstract: The displacement of Ca²⁺, Mg²⁺, K⁺ and Al³⁺ from the A and Bw or Bt horizons of two soils developed over serpentinized amphibolites when equilibrated in Cu²⁺, Cd²⁺ or Pb²⁺ solutions was determined, together with the concomitant sorption of the heavy metal. The contributions of Mg²⁺ to the effective cation exchange capacities of the A and Bt horizons of the Endoleptic Luvisol were 57% and 94%, respectively. and its contributions to those of the A and Bw horizons of the Mollic Cambisol were 70% and 77%, respectively. In all four horizons. cation exchange, chiefly with Mg²⁺ and Ca²⁺, was the process chiefly responsible for sorption of Cd²⁺, Cu²⁺ and Pb²⁺. Al³⁺ and K⁺ were hardly implicated, especially in the case of Cd²⁺. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Acid Soils, Adsorption, Cadmium, Cation Exchange, Cd, Competitive Sorption, Copper, Cu, Cu²⁺, Desorption, Elsevier, Fractions, Heavy Metal, Heavy-Metals, Lead, Magnesium, Metal, Mg, Organic-Matter, Pb, Sepiolite, Soils, Solutions, Sorption, Trace-Metal Sorption, Zinc

? Jain, M., Garg, V.K. and Kadirvelu, K. (2009), Equilibrium and kinetic studies for sequestration of Cr(VI) from simulated wastewater using sunflower waste biomass. Journal of Hazardous Materials, 171 (1-3), 328-334.

Full Text: 2009\J Haz Mat171, 328.pdf

Abstract: in the present work, potential of sunflower head (BSH) [an agricultural waste biomass] to remove Cr(VI) from simulated wastewater has been evaluated under different process conditions such as pH, metal concentration, adsorbent dose and contact time. A contact time of 120 min and pH 2.0 were found to be optimum. Chromium removal decreased from 90.0 to 45.2% as its concentration increased from 10 to 70 mg/L. The Cr(VI) removal increased from 31.4 to 52.4% as adsorbent dose increased from 4.0 to 20.0 g/L using a test solution having 100 mg/L Cr(VI) concentration. Adsorption isotherms were employed to evaluate the maximum adsorption capacity. Adsorption data fitted well to Langmuir isotherm and pseudo-second order model as indicated by high values of correlation coefficient (0.9882 and 0.999) respectively. The adsorption capacity calculated from Langmuir isotherm was 8.177 mg/g. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorbent Dose, Adsorbents, Adsorption, Adsorption Capacity, Adsorption Isotherms, Agricultural, Agricultural Waste, Aqueous-Solutions, Batch, Biomass, Biosorption, Biosorption, Capacity, Chromium, Chromium Removal, Concentration, Correlation, Correlation Coefficient, Cr(VI), Cr(VI) Removal, Data, Equilibrium, Freundlich, Helianthus, Intra-Particle Diffusion, Isotherm, Isotherms, Kinetic, Kinetic Studies, Langmuir, Langmuir Isotherm, Metal, Model, NOV, pH, Potential, Pseudo Second Order, Pseudo-Second Order, Pseudo-Second Order Model, Pseudo-Second-Order, Removal, Rights, Sawdust, Sequestration, Solution, SSE%, Waste, Waste Biomass, Wastewater, Work

? Luo, X.G. and Zhang, L.N. (2009), High effective adsorption of organic dyes on magnetic cellulose beads entrapping activated carbon. Journal of Hazardous Materials, 171 (1-3), 340-347.

Full Text: 2009\J Haz Mat171, 340.pdf

Abstract: Maghemite (gamma-Fe₂O₃) nanoparticles were created with a submerged circulation impinging stream reactor (SCISR) from FeCl3 center dot 6H₂O and FeCl2 center dot 4H2O by using precipitation followed by oxidation. Subsequently, by blending cellulose with the Fe₂O₃ nanoparticles and activated carbon (AC) in 7 wt% NaOH/12 wt% urea aqueous solution pre-cooled to -12°C, millimeter-scale magnetic cellulose beads, coded as MCB-AC, was fabricated via an optimal dropping technology. The cellulose beads containning Fe₂O₃ nanoparticles exhibited sensitive magnetic response, and their recovery could facilitate by applying a magnetic field. The adsorption and desorption of the organic dyes on MCB-AC were investigated to evaluate the removal of dyes (methyl orange and methylene blue) with different charges from aqueous solution. Their adsorption kinetics experiments were carried out and the data were well fitted by a pseudo-second-order equation. The results revealed that the MCB-AC sorbent could efficiently adsorb the organic dyes from wastewater, and the used sorbents could be recovered completely. Therefore, we developed a highly efficient sorbent, which were prepared by using simple and “green” process, for the applications on the removal of hazardous materials. (C) 2009 Published by Elsevier B.V.

Keywords: Activated Carbon, Adsorption, Adsorption and Desorption, Adsorption Kinetics, Alginate Gel Beads, Aqueous Solution, Beads, Biosorbents, Biosorption, Carbon, Cellulose, Chitosan, Data, Desorption, Dyes, Experiments, FeCl₃, Field, Impinging Stream Reactor, Ions, Iron, Kinetics, Magnetic, Magnetic Field, Magnetic Nanoparticles-Cellulose Beads, Methyl Orange, Methylene Blue, Nanoparticles, NaOH, Urea Aqueous-Solution, NOV, Organic, Organic Dyes, Oxidation, Precipitation, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Equation, Recovery, Removal, Removal of Dyes, Removal of Hazardous Materials, Solution, Sorbent, Sorbents, Sorption, Stream, Technology, Wastewater

? Baral, S.S., Das, N., Chaudhury, G.R. and Das, S.N. (2009), A preliminary study on the adsorptive removal of Cr(VI) using seaweed, Hydrilla verticillata. Journal of Hazardous Materials, 171 (1-3), 358-369.

Full Text: 2009\J Haz Mat171, 358.pdf

Abstract: The Cr(VI) adsorption efficiency of the seaweed, Hydrilla verticillata, was studied in batches. The adsorbent was characterized using SEM, BET surface area analyzer, Malvern particle size analyzer, EDAX and FT-IR. Cr(VI) removal efficiency of the adsorbent was studied as a function of different adsorption parameters such as contact time, stirring speed, pH, adsorbent dose, particle size, adsorbate concentration, and temperature. Langmuir, Freundlich, and Temkin adsorption isotherm equations were used in the equilibrium modeling. The adsorption process followed pseudo second-order kinetics and intra-particle diffusion was found to be the rate-controlling step. Experimental data follow Langmuir adsorption isotherm. Thermodynamic parameters such as Gibbs free energy and enthalpy of the adsorption process were evaluated to find out the feasibility of the adsorption process. The negative values of Gibb’s free energy and positive enthalpy values show the feasibility and endothermic nature of the process. The significance of different adsorption parameters along with their combined effect on the adsorption process has been established through a full 2(4) factorial design. Among the different adsorption parameters, pH has the most influential effect on the adsorption process followed by adsorbate concentration and combined effects of all the four parameters were tested. The correlation among different adsorption parameters were studied using multi-variate analysis. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorbent, Adsorbent Dose, Adsorption, Adsorption Isotherm, Adsorptive Removal, Analysis, Aqueous-Solution, Batch, Bet, Bet Surface Area, Biomass, Biosorption, Concentration, Correlation, Cr(VI), Cr(VI) Adsorption, Cr(VI) Removal, Data, Design, Diffusion, Edax, Efficiency, Endothermic, Energy, Enthalpy, Equilibrium, Equilibrium Modeling, Factorial Design, Feasibility, Freundlich, FT-IR, FTIR, Function, Gibbs Free Energy, Heavy-Metals, Hexavalent Chromium, Hydrilla Verticillata, Intra Particle Diffusion, Intra-Particle Diffusion, Intraparticle Diffusion, Isotherm, Isotherm Equations, Kinetics, Langmuir, Langmuir Adsorption Isotherm, Marine-Algae, Mechanism, Modeling, Multivariate, Multivariate Analysis, NOV, Particle Size, pH, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo Second-Order, Pseudo-Second-Order, Removal, Removal Efficiency, Rhizopus-Arrhizus, Rights, Seaweed, Second Order, Second Order Kinetics, Second-Order, Second-Order Kinetics, SEM, Significance, Size, Surface, Surface Area, Synthetic Waste-Water, Temperature, Thermodynamic, Thermodynamic Parameters, Thermodynamics

? Tseng, J.Y., Chang, C.Y., Chang, C.F., Chen, Y.H., Chang, C.C., Ji, D.R., Chiu, C.Y. and Chiang, P.C. (2009), Kinetics and equilibrium of desorption removal of copper from magnetic polymer adsorbent. Journal of Hazardous Materials, 171 (1-3), 370-377.

Full Text: 2009\J Haz Mat171, 370.pdf

Abstract: This study examined the desorption of copper ions, which were adsorbed on the magnetic polymer adsorbent (MPA) of polyvinyl acetate-iminodiacetic acid (M-PVAC-IDA), by ethylenediaminetetraacetic acid (EDTA). Stage-wise desorptions were applied to remove the Cu(II) ions from the Cu(II) adsorbed M-PVAC-IDA (A-M-PVAC-IDA). About seven desorption runs were needed to regenerate the A-M-PVAC-IDA. The Cu(II) desorbed M-PVAC-IDA (D-M-PVAC-IDA) was then reused to adsorb the Cu(II) ions from the Cu(II) ions-containing solution. The cyclic adsorption and desorption operations (CADOs) were performed to further elucidate the kinetics and equilibria of the desorption system of EDTA/A-M-PVAC-IDA and the adsorption system of Cu(II)-containing solution/D-M-PVAC-IDA. Two simple kinetic models, the pseudo-first-order equation and pseudo-second-order equation, were employed to simulate the kinetic behaviors of adsorption and desorption. With respect to the kinetics of adsorption behavior, the simulated results by both kinetic models exhibit good agreement with the experimental data. However, the adsorption capacities (q_e) estimated by the pseudo-first-order equation are more accurate in comparison with those simulated by the pseudo-second-order equation. As for the desorption kinetics, the examination of correlation coefficients of model fittings of data shows that the pseudo-first-order kinetic model gives the better agreement for the cases with different initial solid-phase concentrations and can accurately compute the equilibrium concentrations of solid-phase. The values of q_e after CADOs are consistent with the predicted results via the previous work, evidencing that the adsorption behavior and the characteristics of the regenerated adsorbent of D-M-PVAC-IDA were not altered. In the experiments of desorbing copper ions and CADOs, the desorption isotherm was set up. The Freundlich and Langmuir adsorption (or desorption) isotherms were used to simulate the equilibrium of desorption. The results indicate that the Freundlich equation shows better agreement with the experimental data than the Langmuir equation. The information thus obtained is useful for the better use of M-PVAC-IDA on the removal of heavy mental ions of Cu(II) from the Cu(II) ion-containing water solution with the consideration of its regeneration. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorbent, Adsorption, Adsorption Behavior, Adsorption Capacities, Aqueous-Solutions, Bagasse Fly-Ash, Behavior, Biomass Oedogonium Sp, Characteristics, Comparison, Copper, Copper Ion, Correlation, Cu(II), Cu(II) Ions, Data, Desorbent, Desorption, Desorption Kinetics, EDTA, Equilibria, Equilibrium, Examination, Experimental, Experiments, Freundlich, Freundlich Equation, Information, Ions, Isotherm, Isotherms, Kinetic, Kinetic Model, Kinetic Models, Kinetics, Kinetics of Adsorption, Langmuir, Langmuir Equation, Low-Cost Adsorbent, Magnetic, Magnetic Adsorbent, Metal Chelating Ligand, Micro-Size Magnetic Polymer, Model, Models, NOV, Oil Sludge, Polyethylene-Glycol, Polymer, Pseudo First Order, Pseudo Second Order, Pseudo-First-Order, Pseudo-First-Order Equation, Pseudo-Second-Order, Pseudo-Second-Order Equation, Red Mud, Regeneration, Removal, Rights, Solution, Sugar-Industry Waste, UV-Radiation, Water, Work

? Liu, C.C., Wang, M.K., Chiou, C.S., Li, Y.S., Yang, C.Y. and Lin, Y.A. (2009), Biosorption of chromium, copper and zinc by wine-processing waste sludge: Single and multi-component system study. Journal of Hazardous Materials,