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Adsorption of Cr(VI) from aqueous solutions by spent activated clay.
J Hazard Mater. 2008 Jun 30; 155(1-2):65-75.JH

Abstract

Adsorption of Cr(VI) onto spent activated clay (SAC), a waste produced from an edible oil refinery company, was investigated for its beneficial use in wastewater treatment. After pressure steam treatment, SAC was used as an adsorbent. The adsorption kinetic data were analyzed and fitted well in a pseudo-first-order equation and the rate of removal was found to speed up with decreasing pH and increasing temperature. Activation energy for the adsorption process was found to be 4.01-5.47 kcal/K mol. The Langmuir adsorption isotherm was used to fit the equilibrium data and the effect of pH, temperature and ionic strength were studied. The maximum adsorption capacities for Cr(VI) ranged from 0.743 to 1.422 mg/g for temperature between 4 and 40 degrees C under a condition of pH 2.0. The studies conducted show the process of Cr(VI) removal to be spontaneous at high temperature and endothermic in nature. From the waste utilization and environment point of view, the work carried out is important and useful. Results obtained can serve as baseline data for designing a treatment process using this low-cost adsorbent for the treatment of wastewater rich in Cr(VI).

Authors+Show Affiliations

Department of Civil and Ecological Engineering, I-Shou University, Da-Hsu Township, Kaohsiung 84008, Taiwan. chweng@isu.edu.twNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

18162297

Citation

Weng, Chih-Huang, et al. "Adsorption of Cr(VI) From Aqueous Solutions By Spent Activated Clay." Journal of Hazardous Materials, vol. 155, no. 1-2, 2008, pp. 65-75.
Weng CH, Sharma YC, Chu SH. Adsorption of Cr(VI) from aqueous solutions by spent activated clay. J Hazard Mater. 2008;155(1-2):65-75.
Weng, C. H., Sharma, Y. C., & Chu, S. H. (2008). Adsorption of Cr(VI) from aqueous solutions by spent activated clay. Journal of Hazardous Materials, 155(1-2), 65-75.
Weng CH, Sharma YC, Chu SH. Adsorption of Cr(VI) From Aqueous Solutions By Spent Activated Clay. J Hazard Mater. 2008 Jun 30;155(1-2):65-75. PubMed PMID: 18162297.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adsorption of Cr(VI) from aqueous solutions by spent activated clay. AU - Weng,Chih-Huang, AU - Sharma,Y C, AU - Chu,Sue-Hua, Y1 - 2007/11/17/ PY - 2007/07/11/received PY - 2007/10/20/revised PY - 2007/11/11/accepted PY - 2007/12/29/pubmed PY - 2008/8/2/medline PY - 2007/12/29/entrez SP - 65 EP - 75 JF - Journal of hazardous materials JO - J Hazard Mater VL - 155 IS - 1-2 N2 - Adsorption of Cr(VI) onto spent activated clay (SAC), a waste produced from an edible oil refinery company, was investigated for its beneficial use in wastewater treatment. After pressure steam treatment, SAC was used as an adsorbent. The adsorption kinetic data were analyzed and fitted well in a pseudo-first-order equation and the rate of removal was found to speed up with decreasing pH and increasing temperature. Activation energy for the adsorption process was found to be 4.01-5.47 kcal/K mol. The Langmuir adsorption isotherm was used to fit the equilibrium data and the effect of pH, temperature and ionic strength were studied. The maximum adsorption capacities for Cr(VI) ranged from 0.743 to 1.422 mg/g for temperature between 4 and 40 degrees C under a condition of pH 2.0. The studies conducted show the process of Cr(VI) removal to be spontaneous at high temperature and endothermic in nature. From the waste utilization and environment point of view, the work carried out is important and useful. Results obtained can serve as baseline data for designing a treatment process using this low-cost adsorbent for the treatment of wastewater rich in Cr(VI). SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/18162297/Adsorption_of_Cr_VI__from_aqueous_solutions_by_spent_activated_clay_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)01640-8 DB - PRIME DP - Unbound Medicine ER -