Personal Research Database

Full Text: 2009\J Haz Mat161, 753.pdf

Abstract: In the present study, spent tea leaves (STL) were used as a new non-conventional and low-cost adsorbent for the cationic dye (methylene blue) adsorption in a batch process at 30C. Equilibrium sorption isotherms and kinetics were investigated. The experimental data were analyzed by the Langmuir, Freundlich and Temkin models of adsorption. The adsorption isotherm data were fitted well to the Langmuir isotherm and the monolayer adsorption capacity was found to be 300.052 mg/g at 30C. The kinetic data obtained at different initial concentrations were analyzed using pseudo-first-order, pseudo-second-order and intraparticle diffusion equations. The results revealed that the spent tea leaves, being waste, have the potential to be used as a low-cost adsorbent for the removal of methylene blue from aqueous solutions.

Keywords: AA, Acid Dye, Adsorbent, Adsorption, Adsorption Capacity, Adsorption Isotherm, Adsorption-Kinetics, Am, Aqueous Solutions, Bagasse-Fly-Ash, Basic Dye, Batch, Batch Process, Capacity, Cationic Dye, Data, Diffusion, Dye, Dyes, Enzyme, Equilibrium, Equilibrium Isotherm Analyses, Equilibrium Sorption, Experimental, Freundlich, Granular Activated Carbon, Hazard, Intraparticle, Intraparticle Diffusion, Isotherm, Isotherms, Kinetic, Kinetics, Langmuir, Langmuir Isotherm, Low Cost, Low Cost Adsorbent, Low-Cost Adsorbent, Malachite Green, Mass, Mass Transfer, Mass-Transfer, Masses, Mater, Methylene Blue, Methylene-Blue, Models, Monolayer, N, P, Palm Ash, Pigment, Potential, Process, Pseudo Second Order, Pseudo-Second-Order, Reactive Dye, Removal, Rights, Solutions, Sorption, Sorption Isotherms, Spent Tea Leaves, Sun, Surface, Transfer, Waste, Water

? Elizalde-González, M.P., Fuentes-Ramírez, L.E. and Guevara-Villa, M.R.G. (2009), Degradation of immobilized azo dyes by Klebsiella sp UAP-b5 isolated from maize bioadsorbent. Journal of Hazardous Materials, 161 (2-3), 769-774.

Full Text: 2009\J Haz Mat161, 769.pdf

Abstract: The degradation of two immobilized dyes by Klebsiella sp. UAP-b5 was studied. In batch experiments, the azo dyestuffs Basic Blue 41 and Reactive Black 5 were immobilized onto corn cobs by adsorption, and the adsorption process was characterized by a pseudo-second-order kinetic equation. Klebsiella sp. UAP-b5 was previously isolated from the corn waste and shown to decolorize these dyes in liquid Systems. Here, we demonstrate anaerobic decolorization and reductive biodegradation of these dyes by means of spectrophotometry, HPLC, and IR spectroscopy of the solid waste and desorption solutions. We also demonstrate adsorption of compounds that resemble known degradation products. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid, Acids, Adsorption, Adsorption Process, Aqueous-Solution, Azo Dyes, Azo-Dyes, Basic Blue 41, Batch, Batch Experiments, Biodegradation, Biodegradation, Bjerkandera-Adusta, Black, Cloning, Corn, Corynebacterium-Glutamicum, Decolorization, Degradation, Desorption, Dye, Dyes, Enterobacter-Agglomerans, Enzyme, Experiments, Hazard, Hplc, Immobilization, Immobilized, Int, Ir, Kinetic, Kinetic Equation, Klebsiella, Liquid, Maize, Maize Waste, Mater, Methyl Red, Microbial Decolorization, Nucleic-Acids, P, Pigment, Pneumoniae RS-13, Process, Pseudo Second Order, Pseudo Second Order Kinetic, Pseudo-Second-Order, Pseudo-Second-Order Kinetic Equation, Pu, Reactive Black 5, Rights, Solid Waste, Solutions, Spectrophotometry, Spectroscopy, Surface, Textile Dyes, U, Waste, Water

? Tang, X.W., Li, Z.Z. and Chen, Y.M. (2009), Adsorption behavior of Zn(II) on calcinated Chinese loess. Journal of Hazardous Materials, 161 (2-3), 824-834.

Full Text: 2009\J Haz Mat161, 824.pdf

Abstract: Chinese loess has proven to be effective in removing Zn(II) from aqueous solutions, but the resultant adsorbent-water slurry is difficult to separate. In this paper, the crude loess was calcinated to improve the separation efficiency of slurries in terms of sedimentary rate by increasing the particle sizes of the adsorbent. The sorption capacities of different sorbents, including crude loess, calcinated loess, de-organic crude loess and acid-treated calcinated loess, were obtained and sequenced. The adsorption capacity of the calcinated loess towards Zn(II) was found to be as high as 113.6 mg g^-1. The adsorption isotherms and kinetics of calcinated loess were best-fit with the Freundlich isotherm and the pseudo-second order kinetics, respectively. The thermodynamic analysis revealed that the adsorption was exothermic and spontaneous with a high preference for Zn(II) removal. The adsorption of Zn(II) on calcinated loess implies an ion exchange of the solute with calcite and goethite due to the observed FT-IR and XRD patterns as well as the predicted mean free energies (-11.58 to -9.28 kJ mol^-1 by D-R model). The byproduct of adsorption can be purified and refreshed by using a 0.01 M HCl solution. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid-Mine Drainage, Adsorbent, Adsorption, Adsorption Capacity, Adsorption Isotherms, Am, Analysis, Aqueous Solutions, Aqueous-Solution, Behavior, Calcination, Calcite, Capacity, Chinese, Chinese Loess, Clay, Clay-Minerals, Copper, Desalination, DO, Efficiency, Exchange, Exothermic, Freundlich, Freundlich Isotherm, FT-IR, FTIR, Goethite, Hazard, Heavy-Metals, Ion Exchange, Ion-Exchange, Isotherm, Isotherms, Kinetics, Loess, Manage, Mar, Mater, Minerals, Model, N, P, Pb(II), Preference, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second Order, Pseudo-Second Order Kinetics, Pseudo-Second-Order, Remediation, Removal, Rights, SCI, Separation, Separation Efficiency, Solution, Solutions, Sorbents, Sorption, Spontaneous, Surface, Thermodynamic, Water, XRD, Zinc Sorption, Zn(II), Zn²⁺

? Tsai, S.C., Wang, T.H., Li, M.H., Wei, Y.Y. and Teng, S.P. (2009), Cesium adsorption and distribution onto crushed granite under different physicochemical conditions. Journal of Hazardous Materials, 161 (2-3), 854-861.

Full Text: 2009\J Haz Mat161, 854.pdf

Abstract: The adsorption of cesium onto crushed granite was investigated under different physicochemical conditions including contact time, Cs loading, ionic strength and temperature. In addition. the distribution of adsorbed Cs was examined by X-ray diffraction (XRD) and EDS mapping techniques. The results showed that Cs adsorption to crushed granite behaved as a first-order reaction with nice regression coefficients (R(2) >= 0.971). Both Freundlich and Langmuir models were applicable to describe the adsorption. The maximum sorption capacity determined by Langmuir model was 80 mu mol g(-1) at 25 degrees C and 10 mu mol g(-1) at 55 degrees C. The reduced sorption capacity at high temperature was related to the partial enhancement of desorption from granite surface. In general, Cs adsorption was exothermic (Delta H < 0, with median of -12 kJ mol(-1)) and spontaneous (Delta G < 0, with median of -6.1 at 25 degrees C and -5.0 kJ mol(-1) at 55 degrees C). The presence of competing cations such as sodium and potassium ions in synthetic groundwater significantly reduces the Cs adsorption onto granite. The scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM/EDS) mapping method provided substantial evidences that micaceous minerals (biotite in this case) dominate Cs adsorption. These adsorbed Cs ions were notably distributed onto the frayed edges of biotite minerals. More importantly, the locations of these adsorbed Cs were coincided with the potassium depletion area, implying the displacement of K by Cs adsorption. Further XRD patterns displayed a decreased intensity of signal of biotite as the Cs loading increased, revealing that the interlayer space of biotite was affected by Cs adsorption. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Aqueous Cs+ Ions, Bentonite, Capacity, Cesium, Cesium Adsorption, Clay, Desorption, Eds, First Order, Freundlich, Granite, Groundwater, Hanford Site, Ions, Iron, Kinetic Isotherm, Langmuir, Langmuir Model, Mapping, Minerals, Model, Radiocesium, Removal, Sorption, Strength, Subsurface Sediments, Surface Distribution, Thermodynamic, X-Ray Diffraction, XRD

? Gupta, K. and Ghosh, U.C. (2009), Arsenic removal using hydrous nanostructure iron(III)-titanium(IV) binary mixed oxide from aqueous solution. Journal of Hazardous Materials, 161 (2-3), 884-892.

Full Text: 2009\J Haz Mat161, 884.pdf

Abstract: The synthetic bimetal iron(III)-titanium(IV) oxide (NHITO) used was characterized as hydrous and nanostructured mixed oxide, respectively, by the Fourier transform infra red (FTIR), X-ray diffraction (XRD) pattern and the transmission electron microscopic (TEM) image analyses. Removal of As(III) and As(V) using the NHITO was studied at pH 7.0 (±0.1) with variation of contact time, solute concentration and temperature. The kinetic sorption data, in general. for As(III) described the pseudo-first order while that for As(V) described the pseudo-second order equation. The Langmuir isotherm described the equilibrium data (303 (±1.6) K) of fit was well with the Langmuir model. The Langmuir capacity (q(m) mg g^-1) value of the material is 85.0 (±4.0) and 14.0 (±0.5), respectively, for the reduced and oxidized species. The sorption reactions on NHITO were found to be endothermic and spontaneous, and took place with increasing entropy. The energy (kJ mol^-1) of sorption for As(III) and As(V) estimated, respectively, is 9.09 (±0.01) and 13.51 (±0.04). The sorption percentage reduction of As(V) was significant while that of As(III) was insignificant in presence of phosphate and sulfate. The fixed bed NHITO column (5.1 cm1.0 cm) sorption tests gave 3.0, 0.7 and 4.5 L treated water (As content < 0.01 mg L^-1) from separate As(Ill) and As(V) spiked (0.35±0.02 mg L^-1) natural water samples and from high arsenic(0.11±0.01 mg L^-1) ground water, respectively when inflow rate was (0.06 L h^-1). (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Alumina, Adsorption, Air, Analyses, Aqueous Solution, Arsenic, Arsenic Removal, Arsenic-Sorption, As(III), As(V), Capacity, Carbon, Coated Cement IOCC, Column, Concentration, Contact, CT, Data, Diffusion, Endothermic, Energy, Entropy, Equilibrium, Exchange, Ferric-Oxide, Fixed Bed, FTIR, General, Ground Water, Groundwater, Hazard, Image, Ion, Ion-Exchange, Iron(III)-Titanium(iv) Mixed-Oxide, Isotherm, Kinetic, Kinetic Sorption, Kinetics, L1, Langmuir, Langmuir Isotherm, Langmuir Model, Manage, Mater, Me, Model, Nano-Size, Nanoscale Iron Particles, Nanostructure, Natural, Natural-Water, Office, Oxide, P, Pattern, pH, Phosphate, Pseudo First Order, Pseudo Second Order, Pseudo-First Order, Pseudo-First-Order, Pseudo-Second Order, Pseudo-Second Order Equation, Pseudo-Second-Order, Reduction, Removal, Rights, SCI, Science, Soil, Solution, Sorption, Species, Spontaneous, Sulfate, Supplies, Surface, TEM, Temperature, Titanium-Oxide, Transmission, US, Value, Waste, Water, Water Samples, X, X-Ray, X-Ray Diffraction, XRD

? Shi, T.H., Wang, Z.C., Liu, Y., Jia, S.G. and Du, C.M. (2009), Removal of hexavalent chromium from aqueous solutions by D301, D314 and D354 anion-exchange resins. Journal of Hazardous Materials, 161 (2-3), 900-906.

Full Text: 2009\J Haz Mat161, 900.pdf

Abstract: Removal of hexavalent chromium from electroplating industry wastewater is obligatory in order to avoid pollution. Batch shaking experiments were carried out to evaluate the adsorption capacity of resins (D301, D314 and D354) in the removal of chromium from aqueous solutions. Varying experimental conditions were studied, including Cr⁶⁺ concentrations, resin amounts, initial pH, contact time and temperatures. The ion-exchange process, which is pH-dependent, indicated the maximum removal of Cr⁶⁺ in the pH range of 1-5 for an initial concentration 100 ppm of Cr⁶⁺. It was found that more than 99.4% of the removal was achieved under optimal conditions. High adsorption rates of chromium for the three resins were observed at the onset, and then plateau values were gradually reached within 30 min. The experimental results obtained at various concentrations (27±1C) showed that the adsorption pattern on the resins have followed Langmuir isotherms and the calculated maximum sorption capacities of D301, D314 and D354 were 152.52, 120.48 and 156.25 mg/g, respectively. The thermodynamic parameters (free energy change G, enthalpy change, S and entropy change H) for the sorption have been evaluated. It was also found that the adsorption of chromium on these anion-exchange resins follows first-order reversible kinetics. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Hexavalent Chromium, Anion-Exchange Resin, Adsorption Isotherms, Adsorption Kinetics, Ion-Exchange, Waste-Water, Cr(VI), Adsorption, pH

? Iftikhar, A.R., Bhatti, H.N., Hanif, M.A. and Nadeem, R. (2009), Kinetic and thermodynamic aspects of Cu(II) and Cr(III) removal from aqueous solutions using rose waste biomass. Journal of Hazardous Materials, 161 (2-3), 941-947.

Full Text: 2009\J Haz Mat161, 941.pdf

Abstract: Distillation waste of rose petals was used to remove Cu(II) and Cr(III) from aqueous solutions. The results demonstrated the dependency of metal sorption on pH, sorbent dose, sorbent size, initial bulk concentration, time and temperature. A dosage of 1 g/L of rose waste biomass was found to be effective for maximum uptake of Cu(II) and Cr(III). Optimum sorption temperature and pH for Cu(II) and Cr(III) were 303±1 K and 5, respectively. The Freundlich regression model and pseudo-second-order kinetic model were resulted in high correlation coefficients and described well the sorption of Cu(II) and Cr(Ill) on rose waste biomass. At equilibrium q(max) (mg/g) of Cu(II) and Cr(III) was 55.79 and 67.34, respectively. The free energy change (G) for Cu(II) and Cr(III) sorption process was found to be -0.829 kJ/mol and -1.85 kJ/mol, respectively, which indicates the spontaneous nature of sorption process. Other thermodynamic parameters such as entropy change (S), enthalpy (H)and activation energy (E) were found to be 0.604J mol^-1 K^-1, -186.95 kJ/mol and 68.53 kJ/mol, respectively for Cu(II) and 0.397J mol^-1 K^-1, -119.79 kJ/mol and 114.45 kJ/mol, respectively for Cr(III). The main novelty of this work was the determination of shortest possible sorption time for Cu(II) and Cr(III) in comparison to earlier studies. Almost over 98% of Cu(II) and Cr(III) were removed in only first 20 min at an initial concentration of 100 mg/L. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activation, Activation Energy, Adsorption, Aqueous Solutions, Biomass, Biosorption, Biotechnology, Cadmium, Change, Chromium, Comparison, Concentration, Copper, Correlation, Cr(III), Cu(II), Dependency, Determination, Electron, Energy, Enthalpy, Entropy, Equilibrium, Eucalyptus Bark, First, Food, Freundlich, Hazard, Heavy-Metal Biosorption, Kinetic, Kinetic Model, Kinetics, Life, Mater, Membrane, Metal, Metal Sorption, Model, N, Novelty, P, Pakistan, Pb(II), pH, Process, Pseudo Second Order, Pseudo Second Order Kinetic, Pseudo-Second-Order, Pseudo-Second-Order Kinetic Model, Regression, Regression Model, Removal, Rights, Rose Waste Biomass, SCI, Size, Solutions, Sorbent, Sorbent Dose, Sorption, Sorption Process, Spontaneous, Surface, Temperature, Thermodynamic, Thermodynamic Parameters, Trivalent, Uptake, Waste, Waste Biomass, Water, Work

? Singh, V., Sharma, A.K., Tripathi, D.N. and Sanghi, R. (2009), Poly(methylmethacrylate) grafted chitosan: An efficient adsorbent for anionic azo dyes. Journal of Hazardous Materials, 161 (2-3), 955-966.

Full Text: 2009\J Haz Mat161, 955.pdf

Abstract: Present study reports on peroxydisulfate/ascorbic acid initiated synthesis of Chitosan-graft-poly(methylmethacrylate) (Ch-g-PMMA) and its characterization by FTIR, XRD and 13C NMR. The copolymer remained water insoluble even under highly acidic conditions and was evaluated to be an efficient adsorbent for the three anionic azo dyes (Procion Yellow MX, Remazol Brilliant Violet and Reactive Blue H5G) over a wide pH range of 4-10 being most at pH 7. The adsorbent was also found efficient in decolorizing the textile industry wastewater and was much more efficient than the parent chitosan. Equilibrium sorption experiments were carried out at different pH and initial dye concentration values. The experimental equilibrium data for each adsorbent-dye system were successfully fitted to the Langmuir and Freundlich sorption isotherms. Based on Langmuir model Qmax for yellow, violet and blue dyes was 250, 357 and 178, respectively. Thermodynamic parameters of the adsorption processes such as G, H, and S were calculated. The negative values of free energy reflected the spontaneous nature of adsorption. The adsorption kinetic data of all the three dyes could be well represented by pseudo-second-order model with the correlation coefficients (R2) being 0.9922, 0.9997 and 0.9862, for direct yellow, reactive violet and blue dye, respectively with rate constants 0.9110^-4, 1.8210^-4 and 1.0510^-4 mg^-1 min^-1, respectively. At pH 7, parent chitosan also showed pseudo-second-order kinetics. The temperature dependence of dye uptake and the pseudo-second-order kinetics of the adsorption indicated that chemisorption is the rate-limiting step that controls the process.

Keywords: Aa, Acidic, Activated Carbon, Adsorbent, Adsorption, Adsorption Behavior, Adsorption Kinetic, Am, Aqueous-Solutions, Azo Dye Removal, Azo Dyes, Azo-Dyes, C-13, CaO, Characterization, Chemisorption, Chitosan, Color, Concentration, Copolymer, Correlation, Data, De-Oiled-Soya, Dependence, Dye, Dyes, Energy, Equilibrium, Equilibrium Sorption, Experimental, Experiments, Freundlich, FTIR, Grafted, Grafting, Hazard, Isotherms, Kinetic, Kinetics, Langmuir, Langmuir Model, Low-Cost Adsorbents, Malachite-Green, Manage, Mater, Methylene-Blue, Model, N, NMR, P, Persulfate, Ascorbic Acid, pH, Phanerochaete-Chrysosporium, Pigment, Poly(Methylmethacrylate), Process, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Pseudo-Second-Order Model, Rate Constants, Rate Limiting Step, Rate-Limiting Step, Reactive Dyes, Rights, RS, SCI, Sorption, Sorption Isotherms, Spontaneous, Surface, Synthesis, Temperature, Textile Industry, Thermodynamic, Thermodynamic Parameters, Uptake, Values, Waste, Waste-Water, Wastewater, Water, X, XRD

? Zhou, L.M., Wang, Y.P., Liu, Z.R. and Huang, Q.W. (2009), Characteristics of equilibrium, kinetics studies for adsorption of Hg(II), Cu(II), and Ni(II) ions by thiourea-modified magnetic chitosan microspheres. Journal of Hazardous Materials, 161 (2-3), 995-1002.

Full Text: 2009\J Haz Mat161, 995.pdf

Abstract: Magnetic chitosan microspheres were prepared and chemically modified with thiourea (TMCS) for adsorption of metal ions. TMCS obtained were investigated by means of X-ray diffraction (XRD), IR, magnetic properties and thermogravimetric analysis (TGA). The adsorption properties of TMCS toward Hg²⁺, Cu²⁺, and Ni²⁺ ions were evaluated. Various factors affecting the uptake behavior such as contact time, temperature, pH and initial concentration of the metal ions were investigated. The kinetics was evaluated utilizing the pseudo-first-order, pseudo-second-order, and the intra-particle diffusion models. The equilibrium data were analyzed using the Langmuir, Freundlich, and Tempkin isotherm models. The adsorption kinetics followed the mechanism of the pseudo-second-order equation for all systems studied, evidencing chemical sorption as the rate-limiting step of adsorption mechanism and not involving a mass transfer in solution. The best interpretation for the equilibrium data was given by Langmuir isotherm, and the maximum adsorption capacities were 625.2, 66.7, and 15.3 mg/g for Hg²⁺, Cu²⁺, and Ni²⁺ ions, respectively. TMCS displayed higher adsorption capacity for Hg²⁺ in all pH ranges studied. The adsorption capacity of the metal ions decreased with increasing temperature. The metal ion-loaded TMCS with were regenerated with an efficiency of greater than 88% using 0.01-0.1 M ethylendiamine tetraacetic acid (EDTA). (C) 2008 Elsevier B.V. All rights reserved.

Keywords: AA, Adsorbents, Adsorption, Adsorption Capacities, Adsorption Capacity, Adsorption Kinetics, Adsorption Mechanism, Adsorption Properties, Am, Analysis, Aqueous-Solutions, Behavior, Capacity, Chemical, Chemical Sorption, Chitosan, Chitosan Magnetic Microspheres, Clay, Concentration, Contact, Cu(II), Cu²⁺, Data, Derivatives, Diffusion, EDTA, Efficiency, Equilibrium, Freundlich, Gel Beads, Hazard, Heavy Metals, Hg(II), INT, Intra-Particle Diffusion, Intraparticle, Intraparticle Diffusion, Ions, IR, Isotherm, Isotherm Models, Kinetics, Langmuir, Langmuir Isotherm, LCA, Magnetic, Magnetic Properties, Magnetic-Chitosan, Mass, Mass Transfer, Mater, Mechanism, Metal, Metal Ions, Metal-Ions, Microspheres, Models, Modified, Ni(II), Ni(II) Ions, Ni²⁺, P, Palladium, pH, Pseudo First Order, Pseudo Second Order, Pseudo-First-Order, Pseudo-Second-Order, Pseudo-Second-Order Equation, Rate Limiting Step, Rate-Limiting Step, Recovery, Removal, Rights, Sci, Solution, Sorption, Systems, Temperature, Tempkin, TGA, Thiourea, Uptake, Water, X-Ray, X-Ray Diffraction, XRD, Young

? Ucun, H., Aksakal, O. and Yildiz, E. (2009), Copper(II) and zinc(II) biosorption on Pinus sylvestris L. Journal of Hazardous Materials, 161 (2-3), 1040-1045.

Full Text: 2009\J Haz Mat161, 1040.pdf

Abstract: The biosorption properties of copper(II) and zinc(II) onto a cone biomass of Pinus sylvestris L. was investigated by using batch techniques. The biosorption studies carried out with single metal solutions. The removal of copper(II) and zinc(II) from aqueous solution increased with pH and sharply decreased when pH of the solution was decreased. The maximum biosorption efficiency of P. sylvestris was 67% and 30% for Cu(II) and Zn(II), respectively. Batch kinetic and isotherm of biosorption metal ions were investigated. The second-order kinetic model was used to correlate the experimental data. The Freundlich and Langmuir model can describe the adsorption equilibrium of metal(II) on cone biomass. The biosorption constants were found from the Freundlich and Langmuir isotherms at 25C. It is found that the biosorption data of metals on cone biomass fitted both the Freundlich and Langmuir adsorption models. (C) 2008 Elsevier BY. All rights reserved.

Keywords: Adsorption, Adsorption Equilibrium, Algae, Am, Aqueous Solution, Aqueous-Solutions, Batch, Biomass, Biosorption, Cone Biomass, Copper(II), Cu(II), Data, Desalination, Efficiency, Equilibrium, Experimental, Freundlich, Hazard, Heavy-Metals, In-Vivo, INT, Ions, Isotherm, Isotherms, Kinetic, Kinetic Model, Langmuir, Langmuir Isotherms, Langmuir Model, Mater, Metal, Metal Ions, Metals, Model, Models, N, P, pH, Pinus Sylvestris, Pinus Sylvestris L., Plant, Removal, Rights, SCI, SE, Second Order, Second-Order, Solution, Solutions, Sorption, Techniques, Vivo, Water, Zinc(II), Zn(II)

? Sharma, P., Singh, L. and Dilbaghi, N. (2009), Response surface methodological approach for the decolorization of simulated dye effluent using Aspergillus fumigatus fresenius. Journal of Hazardous Materials, 161 (2-3), 1081-1086.

Full Text: 2009\J Haz Mat161, 1081.pdf

Abstract: The aim of our research was to study, effect of temperature, pH and initial dye concentration on decolorization of diazo dye Acid Red 151 (AR 151) from simulated dye solution using a fungal isolate Aspergillus fumigatus fresenius have been investigated. The central composite design matrix and response surface methodology (RSM) have been applied to design the experiments to evaluate the interactive effects of three most important operating variables: temperature (25-35C), pH (4.0-7.0), and initial dye concentration (100-200 mg/L) on the biodegradation of AR 151. The total 20 experiments were conducted in the present study towards the construction of a quadratic model. Very high regression coefficient between the variables and the response (R-2 = 0.9934) indicated excellent evaluation of experimental data by second-order polynomial regression model. The RSM indicated that initial dye concentration of 150 mg/L, pH 5.5 and a temperature of 30C were optimal for maximum % clecolorization of AR 151 in simulated dye solution, and 84.8% decolorization of AR 151 was observed at optimum growth conditions. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Approach, Aqueous-Solution, Aspergillus Fumigatus, Aspergillus Fumigatus Fresenius, Azo Dye, Biodegradation, Central Composite Design, Composite, Concentration, Construction, Data, DC, Decolorization, Degradation, Design, Dye, Dyes, Effects, Enzyme, Evaluation, Experimental, Experiments, Growth, Matrix, Methodology, Model, N, Optimization, pH, Pigment, Reactive Azo Dyes, Regression, Regression Model, Removal, Research, Response Surface Methodology, Rights, SCI, Second Order, Second-Order, Solution, Surface, Temperature, UK, Wastewaters, Water

? Tabak, A., Eren, E., Afsin, B. and Caglar, B. (2009), Determination of adsorptive properties of a Turkish Sepiolite for removal of Reactive Blue 15 anionic dye from aqueous solutions. Journal of Hazardous Materials,