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Speciation and removal of chromium from aqueous solution by white, yellow and red UAE sand.
J Hazard Mater. 2009 Sep 30; 169(1-3):948-52.JH

Abstract

Removal of Cr(III) and Cr(VI) from aqueous solutions by different types of sand as a low cost abundant adsorbent was investigated. White, yellow and red sands from the United Arab Emirates (UAE) were employed at various adsorbent/metal ion ratios. The effect of contact time, pH, temperature, metal concentration and sand dosage was studied. The optimal pH for adsorption was ca. 5.0 for Cr(III) and 2.0 for Cr(VI). The optimal adsorption time for both ions was ca. 3h. Even at the optimal pH, adsorption of Cr(VI) on all sand forms was very low (removal <or=10%) and could not be fitted to any of the common isotherms. While at pH 5.0 Cr(VI) was not adsorbed at all, Cr(III) was totally removed. Adsorption of Cr(III) by the three sand forms obeyed Lagregren first order kinetics. The rate constants at 25.0 degrees C were 3.95 x 10(-4), 2.28 x 10(-5) and 7.75 x 10(-6)s(-1) for white, yellow and red sand, respectively. For Cr(III), the Langmuir isotherm gave the best fit for adsorption. At 25.0 degrees C, the maximum mass of Cr(III) removed per gram of sand (Q(max)) was 62.5, 9.80 and 2.38 (mg/g) for white, yellow and red sand, respectively. DeltaH degrees was 14.5, 51.2 and 45.8 kJ mol(-1) and DeltaS degrees was 24.0, 136 and 111 JK(-1)mol(-1) for adsorption on white, yellow and red sand, respectively. The results are discussed in terms of the chromium species present in the solution and the effect of sand particle distribution and metal composition on adsorption efficiency.

Authors+Show Affiliations

Department of Biology and Chemistry, American University of Sharjah, Sharjah, United Arab Emirates. mkhamis@science.alquds.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

19443116

Citation

Khamis, Mustafa, et al. "Speciation and Removal of Chromium From Aqueous Solution By White, Yellow and Red UAE Sand." Journal of Hazardous Materials, vol. 169, no. 1-3, 2009, pp. 948-52.
Khamis M, Jumean F, Abdo N. Speciation and removal of chromium from aqueous solution by white, yellow and red UAE sand. J Hazard Mater. 2009;169(1-3):948-52.
Khamis, M., Jumean, F., & Abdo, N. (2009). Speciation and removal of chromium from aqueous solution by white, yellow and red UAE sand. Journal of Hazardous Materials, 169(1-3), 948-52. https://doi.org/10.1016/j.jhazmat.2009.04.053
Khamis M, Jumean F, Abdo N. Speciation and Removal of Chromium From Aqueous Solution By White, Yellow and Red UAE Sand. J Hazard Mater. 2009 Sep 30;169(1-3):948-52. PubMed PMID: 19443116.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Speciation and removal of chromium from aqueous solution by white, yellow and red UAE sand. AU - Khamis,Mustafa, AU - Jumean,Fawwaz, AU - Abdo,Naser, Y1 - 2009/04/19/ PY - 2008/05/25/received PY - 2009/04/09/revised PY - 2009/04/13/accepted PY - 2009/5/16/entrez PY - 2009/5/16/pubmed PY - 2009/9/29/medline SP - 948 EP - 52 JF - Journal of hazardous materials JO - J Hazard Mater VL - 169 IS - 1-3 N2 - Removal of Cr(III) and Cr(VI) from aqueous solutions by different types of sand as a low cost abundant adsorbent was investigated. White, yellow and red sands from the United Arab Emirates (UAE) were employed at various adsorbent/metal ion ratios. The effect of contact time, pH, temperature, metal concentration and sand dosage was studied. The optimal pH for adsorption was ca. 5.0 for Cr(III) and 2.0 for Cr(VI). The optimal adsorption time for both ions was ca. 3h. Even at the optimal pH, adsorption of Cr(VI) on all sand forms was very low (removal <or=10%) and could not be fitted to any of the common isotherms. While at pH 5.0 Cr(VI) was not adsorbed at all, Cr(III) was totally removed. Adsorption of Cr(III) by the three sand forms obeyed Lagregren first order kinetics. The rate constants at 25.0 degrees C were 3.95 x 10(-4), 2.28 x 10(-5) and 7.75 x 10(-6)s(-1) for white, yellow and red sand, respectively. For Cr(III), the Langmuir isotherm gave the best fit for adsorption. At 25.0 degrees C, the maximum mass of Cr(III) removed per gram of sand (Q(max)) was 62.5, 9.80 and 2.38 (mg/g) for white, yellow and red sand, respectively. DeltaH degrees was 14.5, 51.2 and 45.8 kJ mol(-1) and DeltaS degrees was 24.0, 136 and 111 JK(-1)mol(-1) for adsorption on white, yellow and red sand, respectively. The results are discussed in terms of the chromium species present in the solution and the effect of sand particle distribution and metal composition on adsorption efficiency. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/19443116/Speciation_and_removal_of_chromium_from_aqueous_solution_by_white_yellow_and_red_UAE_sand_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(09)00610-4 DB - PRIME DP - Unbound Medicine ER -