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Removal of hexavalent chromium from acidic aqueous solutions using rice straw-derived carbon.
J Hazard Mater. 2009 Nov 15; 171(1-3):1066-70.JH

Abstract

This study evaluates the removal of Cr(VI) from water by carbon derived from the burning of rice straw. Rice straw was burned in the air to obtain rice carbon (RC), and then the removal of Cr(VI) by RC was investigated under various pHs and ionic strengths. After the experiments, the oxidation state of Cr bound to RC was analyzed using X-ray photoelectron spectroscopy, which revealed that Cr bound to RC was predominately in the trivalent form. The results showed that upon reacting with RC, Cr(VI) was reduced to Cr(III), which was either adsorbed on RC or released back into solution. The extent and rate of Cr(VI) removal increased with decreasing solution pH because the Cr(VI) adsorption and the subsequent reduction of adsorbed Cr(VI) to Cr(III) both occur preferentially at low pH. The minimal effect of ionic strength on the rates of Cr(VI) removal and Cr(III) adsorption indicated specific interactions between Cr(VI)/Cr(III) and their surface binding sites on RC. These results suggest that rice straw-based carbon may be effectively used at low pH as a substitute for activated carbon for the treatment of Cr(VI) contaminated water.

Authors+Show Affiliations

Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 40227, Taiwan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

19619940

Citation

Hsu, Nai-Hua, et al. "Removal of Hexavalent Chromium From Acidic Aqueous Solutions Using Rice Straw-derived Carbon." Journal of Hazardous Materials, vol. 171, no. 1-3, 2009, pp. 1066-70.
Hsu NH, Wang SL, Liao YH, et al. Removal of hexavalent chromium from acidic aqueous solutions using rice straw-derived carbon. J Hazard Mater. 2009;171(1-3):1066-70.
Hsu, N. H., Wang, S. L., Liao, Y. H., Huang, S. T., Tzou, Y. M., & Huang, Y. M. (2009). Removal of hexavalent chromium from acidic aqueous solutions using rice straw-derived carbon. Journal of Hazardous Materials, 171(1-3), 1066-70. https://doi.org/10.1016/j.jhazmat.2009.06.112
Hsu NH, et al. Removal of Hexavalent Chromium From Acidic Aqueous Solutions Using Rice Straw-derived Carbon. J Hazard Mater. 2009 Nov 15;171(1-3):1066-70. PubMed PMID: 19619940.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of hexavalent chromium from acidic aqueous solutions using rice straw-derived carbon. AU - Hsu,Nai-Hua, AU - Wang,Shan-Li, AU - Liao,Yi-Huei, AU - Huang,Shiuh-Tsuen, AU - Tzou,Yu-Min, AU - Huang,Yuh-Ming, Y1 - 2009/06/27/ PY - 2009/03/12/received PY - 2009/06/03/revised PY - 2009/06/20/accepted PY - 2009/7/22/entrez PY - 2009/7/22/pubmed PY - 2010/1/20/medline SP - 1066 EP - 70 JF - Journal of hazardous materials JO - J Hazard Mater VL - 171 IS - 1-3 N2 - This study evaluates the removal of Cr(VI) from water by carbon derived from the burning of rice straw. Rice straw was burned in the air to obtain rice carbon (RC), and then the removal of Cr(VI) by RC was investigated under various pHs and ionic strengths. After the experiments, the oxidation state of Cr bound to RC was analyzed using X-ray photoelectron spectroscopy, which revealed that Cr bound to RC was predominately in the trivalent form. The results showed that upon reacting with RC, Cr(VI) was reduced to Cr(III), which was either adsorbed on RC or released back into solution. The extent and rate of Cr(VI) removal increased with decreasing solution pH because the Cr(VI) adsorption and the subsequent reduction of adsorbed Cr(VI) to Cr(III) both occur preferentially at low pH. The minimal effect of ionic strength on the rates of Cr(VI) removal and Cr(III) adsorption indicated specific interactions between Cr(VI)/Cr(III) and their surface binding sites on RC. These results suggest that rice straw-based carbon may be effectively used at low pH as a substitute for activated carbon for the treatment of Cr(VI) contaminated water. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/19619940/Removal_of_hexavalent_chromium_from_acidic_aqueous_solutions_using_rice_straw_derived_carbon_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(09)01044-9 DB - PRIME DP - Unbound Medicine ER -