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Chromium(VI) biosorption by dried Rhizopus arrhizus: effect of salt (NaCl) concentration on equilibrium and kinetic parameters.
J Hazard Mater. 2007 Jun 25; 145(1-2):210-20.JH

Abstract

Some industrial wastewaters contain high quantities of salts besides heavy metal ions. The presence of salt ions leads to high ionic strength, which may significantly affect the performance of the biosorption process so the effect of salts on the biosorption of heavy metal ions should be investigated. In this study the biosorption of chromium(VI) from saline solutions on dried Rhizopus arrhizus was studied as a function of pH, initial chromium(VI) and salt (NaCl) concentrations in a batch system. The biosorption capacity of R. arrhizus strongly depended on solution pH and maximum chromium(VI) sorption capacity of sorbent was obtained at pH 2.0 both in the absence and in the presence of increasing concentrations of salt. Chromium(VI)-salt biosorption studies were performed at this pH value. Equilibrium uptakes of chromium(VI) increased with increasing chromium(VI) concentration up to 250mgl(-1) and decreased considerably by the presence of increasing concentrations of salt. At 100mgl(-1), initial chromium(VI) concentration, dried R. arrhizus biosorbed 78.0mgg(-1) of chromium(VI) in 72h without salt medium. When salt concentration was raised to 50gl(-1), this value dropped to 64.0mgg(-1) of chromium(VI) at the same conditions resulting in 17.9% decrease of biosorption capacity. The equilibrium sorption data were analysed by using Freundlich, Langmuir, Redlich-Peterson and Langmuir-Freundlich (Sips), the two and three parameters adsorption models, using non-linear regression technique and isotherm constants were evaluated depending on salt concentration. The Langmuir-Freundlich (Sips) was the best suitable adsorption model for describing the biosorption of chromium(VI) individually and in salt-containing medium. Pseudo-first-order, pseudo-second-order and saturation type kinetic models described the biosorption kinetics accurately at all chromium(VI) concentrations in the absence and in the presence of changing concentrations of salt. Isotherm and saturation type kinetic constants varied due to the level of salt were expressed as a function of initial salt concentration.

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Authors+Show Affiliations

Aksu Z
Hacettepe University, Department of Chemical Engineering, 06532 Beytepe, Ankara, Turkey. zaksu@hacettepe.edu.tr
Balibek E
No affiliation info available

MeSH

AdsorptionChromiumIndustrial WasteKineticsModels, ChemicalRhizopusSodium ChlorideWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17188810

Citation

Aksu, Z, and E Balibek. "Chromium(VI) Biosorption By Dried Rhizopus Arrhizus: Effect of Salt (NaCl) Concentration On Equilibrium and Kinetic Parameters." Journal of Hazardous Materials, vol. 145, no. 1-2, 2007, pp. 210-20.
Aksu Z, Balibek E. Chromium(VI) biosorption by dried Rhizopus arrhizus: effect of salt (NaCl) concentration on equilibrium and kinetic parameters. J Hazard Mater. 2007;145(1-2):210-20.
Aksu, Z., & Balibek, E. (2007). Chromium(VI) biosorption by dried Rhizopus arrhizus: effect of salt (NaCl) concentration on equilibrium and kinetic parameters. Journal of Hazardous Materials, 145(1-2), 210-20.
Aksu Z, Balibek E. Chromium(VI) Biosorption By Dried Rhizopus Arrhizus: Effect of Salt (NaCl) Concentration On Equilibrium and Kinetic Parameters. J Hazard Mater. 2007 Jun 25;145(1-2):210-20. PubMed PMID: 17188810.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chromium(VI) biosorption by dried Rhizopus arrhizus: effect of salt (NaCl) concentration on equilibrium and kinetic parameters. AU - Aksu,Z, AU - Balibek,E, Y1 - 2006/11/15/ PY - 2006/07/19/received PY - 2006/11/08/revised PY - 2006/11/08/accepted PY - 2006/12/26/pubmed PY - 2007/10/2/medline PY - 2006/12/26/entrez SP - 210 EP - 20 JF - Journal of hazardous materials JO - J Hazard Mater VL - 145 IS - 1-2 N2 - Some industrial wastewaters contain high quantities of salts besides heavy metal ions. The presence of salt ions leads to high ionic strength, which may significantly affect the performance of the biosorption process so the effect of salts on the biosorption of heavy metal ions should be investigated. In this study the biosorption of chromium(VI) from saline solutions on dried Rhizopus arrhizus was studied as a function of pH, initial chromium(VI) and salt (NaCl) concentrations in a batch system. The biosorption capacity of R. arrhizus strongly depended on solution pH and maximum chromium(VI) sorption capacity of sorbent was obtained at pH 2.0 both in the absence and in the presence of increasing concentrations of salt. Chromium(VI)-salt biosorption studies were performed at this pH value. Equilibrium uptakes of chromium(VI) increased with increasing chromium(VI) concentration up to 250mgl(-1) and decreased considerably by the presence of increasing concentrations of salt. At 100mgl(-1), initial chromium(VI) concentration, dried R. arrhizus biosorbed 78.0mgg(-1) of chromium(VI) in 72h without salt medium. When salt concentration was raised to 50gl(-1), this value dropped to 64.0mgg(-1) of chromium(VI) at the same conditions resulting in 17.9% decrease of biosorption capacity. The equilibrium sorption data were analysed by using Freundlich, Langmuir, Redlich-Peterson and Langmuir-Freundlich (Sips), the two and three parameters adsorption models, using non-linear regression technique and isotherm constants were evaluated depending on salt concentration. The Langmuir-Freundlich (Sips) was the best suitable adsorption model for describing the biosorption of chromium(VI) individually and in salt-containing medium. Pseudo-first-order, pseudo-second-order and saturation type kinetic models described the biosorption kinetics accurately at all chromium(VI) concentrations in the absence and in the presence of changing concentrations of salt. Isotherm and saturation type kinetic constants varied due to the level of salt were expressed as a function of initial salt concentration. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17188810/Chromium_VI__biosorption_by_dried_Rhizopus_arrhizus:_effect_of_salt__NaCl__concentration_on_equilibrium_and_kinetic_parameters_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(06)01367-7 DB - PRIME DP - Unbound Medicine ER -