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Characterization of Cr(VI) removal from aqueous solutions by a surplus agricultural waste--rice straw.
J Hazard Mater. 2008 Jan 31; 150(2):446-52.JH

Abstract

The removal of Cr(VI) from aqueous solution by rice straw, a surplus agricultural byproduct was investigated. The optimal pH was 2.0 and Cr(VI) removal rate increased with decreased Cr(VI) concentration and with increased temperature. Decrease in straw particle size led to an increase in Cr(VI) removal. Equilibrium was achieved in about 48 h under standard conditions, and Cr(III), which appeared in the solution and remained stable thereafter, indicating that both reduction and adsorption played a part in the Cr(VI) removal. The increase of the solution pH suggested that protons were needed for the Cr(VI) removal. A relatively high level of NO(3)(-) notably restrained the reduction of Cr(VI) to Cr(III), while high level of SO(4)(2-) supported it. The promotion of the tartaric acid modified rice straw (TARS) and the slight inhibition of the esterified rice straw (ERS) on Cr(VI) removal indicated that carboxyl groups present on the biomass played an important role in chromium remediation even though were not fully responsible for it. Isotherm tests showed that equilibrium sorption data were better represented by Langmuir model and the sorption capacity of rice straw was found to be 3.15 mg/g.

Authors+Show Affiliations

College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.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

17574737

Citation

Gao, Hui, et al. "Characterization of Cr(VI) Removal From Aqueous Solutions By a Surplus Agricultural Waste--rice Straw." Journal of Hazardous Materials, vol. 150, no. 2, 2008, pp. 446-52.
Gao H, Liu Y, Zeng G, et al. Characterization of Cr(VI) removal from aqueous solutions by a surplus agricultural waste--rice straw. J Hazard Mater. 2008;150(2):446-52.
Gao, H., Liu, Y., Zeng, G., Xu, W., Li, T., & Xia, W. (2008). Characterization of Cr(VI) removal from aqueous solutions by a surplus agricultural waste--rice straw. Journal of Hazardous Materials, 150(2), 446-52.
Gao H, et al. Characterization of Cr(VI) Removal From Aqueous Solutions By a Surplus Agricultural Waste--rice Straw. J Hazard Mater. 2008 Jan 31;150(2):446-52. PubMed PMID: 17574737.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization of Cr(VI) removal from aqueous solutions by a surplus agricultural waste--rice straw. AU - Gao,Hui, AU - Liu,Yunguo, AU - Zeng,Guangming, AU - Xu,Weihua, AU - Li,Ting, AU - Xia,Wenbin, Y1 - 2007/05/03/ PY - 2006/10/17/received PY - 2007/02/23/revised PY - 2007/04/29/accepted PY - 2007/6/19/pubmed PY - 2008/5/14/medline PY - 2007/6/19/entrez SP - 446 EP - 52 JF - Journal of hazardous materials JO - J Hazard Mater VL - 150 IS - 2 N2 - The removal of Cr(VI) from aqueous solution by rice straw, a surplus agricultural byproduct was investigated. The optimal pH was 2.0 and Cr(VI) removal rate increased with decreased Cr(VI) concentration and with increased temperature. Decrease in straw particle size led to an increase in Cr(VI) removal. Equilibrium was achieved in about 48 h under standard conditions, and Cr(III), which appeared in the solution and remained stable thereafter, indicating that both reduction and adsorption played a part in the Cr(VI) removal. The increase of the solution pH suggested that protons were needed for the Cr(VI) removal. A relatively high level of NO(3)(-) notably restrained the reduction of Cr(VI) to Cr(III), while high level of SO(4)(2-) supported it. The promotion of the tartaric acid modified rice straw (TARS) and the slight inhibition of the esterified rice straw (ERS) on Cr(VI) removal indicated that carboxyl groups present on the biomass played an important role in chromium remediation even though were not fully responsible for it. Isotherm tests showed that equilibrium sorption data were better represented by Langmuir model and the sorption capacity of rice straw was found to be 3.15 mg/g. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17574737/Characterization_of_Cr_VI__removal_from_aqueous_solutions_by_a_surplus_agricultural_waste__rice_straw_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)00643-7 DB - PRIME DP - Unbound Medicine ER -