PMID: 16646455May 2, 2006Paper

Bidentate complexation modeling of heavy metal adsorption and competition on goethite

Environmental Science & Technology
Ying XuJames A Dyer

Abstract

Accurate sorption modeling is critical for environmental risk assessment and development of sound remedial technologies. Adsorption to iron oxide phases is one of the important sorption processes regulating the bioavailability and toxicity of metal ions in natural systems. In this study, we used spectroscopically derived bidentate surface species to constrain surface complexation modeling in addressing Ni(ll) and Zn(ll) adsorption and competition on goethite surfaces. The 2-pK(a) triple layer model successfully predicted adsorption in single adsorbate systems. The curvature in adsorption isotherms was accurately depicted using two types of sites: high affinity and low affinity, and mononuclear bidentate surface complexes. A constrained set of parameters was found for each metal (log K(L) = -6.63 and log K(H) = -2.45 for Ni, log K(L) = -3.92 and log K(H) = 2.14 for Zn) that successfully described adsorption over a large range of experimental conditions, covering 6 to 7 orders of magnitude in concentration, ionic strength from 10(-3) to 10(-2), and environmentally relevant pH range between 4 and 6.5. Adsorption competition was predicted using the bidentate surface species with parameters calibrated using single adsorbate data.

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Citations

Apr 5, 2013·Environmental Science & Technology·Zimeng Wang, Daniel E Giammar
Dec 29, 2012·Journal of Hazardous Materials·Peng LiangMing H Wong
May 23, 2012·Ecotoxicology and Environmental Safety·Bing WuMei Li
Jun 5, 2012·Carbohydrate Polymers·Xue-Tao ZhaoZhi Xie
Jan 1, 2015·Chemosphere·Zhan ShuKandalam V Ramanujachary
Dec 18, 2013·Chemosphere·Haibo LiuRay L Frost
Jun 5, 2007·Journal of Colloid and Interface Science·Nidhi SinghalVineet Kumar
Jul 28, 2017·Environmental Science & Technology·Zezhen PanDaniel E Giammar
Aug 6, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tianci ZhaoHuifeng Liang
Sep 7, 2020·The Science of the Total Environment·Meiqing ShiYangjin Wei
Sep 27, 2019·Environmental Science & Technology·Zezhen PanDaniel E Giammar
Aug 4, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Jie ChenWei Yan

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