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Kinetics of the reduction of hexavalent chromium with the brown seaweed Ecklonia biomass.
Chemosphere. 2007 Jan; 66(5):939-46.C

Abstract

The dead biomass of the brown seaweed, Ecklonia sp., is capable of reducing toxic Cr(VI) into less toxic or nontoxic Cr(III). However, little is known about the mechanism of Cr(VI) reduction by the biomass. The objective of this work was to develop a kinetic model for Cr(VI) biosorption, for supporting our mechanism. The reduction rate of Cr(VI) increased with increasing total chromate concentration, [Cr(VI)], and equivalent concentration of organic compounds, [OCs], and decreasing solution pH. It was found that the reduction rate of Cr(VI) was proportional to [Cr(VI)] and [OCs], suggesting the simple kinetic equation -d[Cr(VI)]/dt=k[Cr(VI)][OCs]. When considering the consumption of organic compounds due to the oxidation by Cr(VI), an average rate coefficient of 9.33 (+/-0.65)microM(-1)h(-1) was determined, at pH 2. Although the function of the pH could not be expressed in a mechanistic manner, an empirical model able to describe the pH dependence was obtained. It is expected that the developed rate equation could likely be used for design and performance predictions of biosorption processes for treating chromate wastewaters.

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Authors+Show Affiliations

Park D
Advanced Environmental Biotechnology Research Center, Department of Chemical Engineering, School of Environmental Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, Republic of Korea.
Yun YS
No affiliation info available
Ahn CK
No affiliation info available
Park JM
No affiliation info available

MeSH

BiomassChromiumHydrogen-Ion ConcentrationKineticsOxidation-ReductionPhaeophytaWaste Disposal, FluidWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16837023

Citation

Park, Donghee, et al. "Kinetics of the Reduction of Hexavalent Chromium With the Brown Seaweed Ecklonia Biomass." Chemosphere, vol. 66, no. 5, 2007, pp. 939-46.
Park D, Yun YS, Ahn CK, et al. Kinetics of the reduction of hexavalent chromium with the brown seaweed Ecklonia biomass. Chemosphere. 2007;66(5):939-46.
Park, D., Yun, Y. S., Ahn, C. K., & Park, J. M. (2007). Kinetics of the reduction of hexavalent chromium with the brown seaweed Ecklonia biomass. Chemosphere, 66(5), 939-46.
Park D, et al. Kinetics of the Reduction of Hexavalent Chromium With the Brown Seaweed Ecklonia Biomass. Chemosphere. 2007;66(5):939-46. PubMed PMID: 16837023.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics of the reduction of hexavalent chromium with the brown seaweed Ecklonia biomass. AU - Park,Donghee, AU - Yun,Yeoung-Sang, AU - Ahn,Chi Kyu, AU - Park,Jong Moon, Y1 - 2006/07/11/ PY - 2006/01/19/received PY - 2006/05/25/revised PY - 2006/05/30/accepted PY - 2006/7/14/pubmed PY - 2007/3/14/medline PY - 2006/7/14/entrez SP - 939 EP - 46 JF - Chemosphere JO - Chemosphere VL - 66 IS - 5 N2 - The dead biomass of the brown seaweed, Ecklonia sp., is capable of reducing toxic Cr(VI) into less toxic or nontoxic Cr(III). However, little is known about the mechanism of Cr(VI) reduction by the biomass. The objective of this work was to develop a kinetic model for Cr(VI) biosorption, for supporting our mechanism. The reduction rate of Cr(VI) increased with increasing total chromate concentration, [Cr(VI)], and equivalent concentration of organic compounds, [OCs], and decreasing solution pH. It was found that the reduction rate of Cr(VI) was proportional to [Cr(VI)] and [OCs], suggesting the simple kinetic equation -d[Cr(VI)]/dt=k[Cr(VI)][OCs]. When considering the consumption of organic compounds due to the oxidation by Cr(VI), an average rate coefficient of 9.33 (+/-0.65)microM(-1)h(-1) was determined, at pH 2. Although the function of the pH could not be expressed in a mechanistic manner, an empirical model able to describe the pH dependence was obtained. It is expected that the developed rate equation could likely be used for design and performance predictions of biosorption processes for treating chromate wastewaters. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/16837023/Kinetics_of_the_reduction_of_hexavalent_chromium_with_the_brown_seaweed_Ecklonia_biomass_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(06)00730-2 DB - PRIME DP - Unbound Medicine ER -