Surface Complexation Model for the Heavy Metal Adsorption on Natural Sediment

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• 作者：Xianghua Wen ; Qing Du ; and Hongxiao Tang
• 刊名：Environmental Science & Technology
• 出版年：1998
• 出版时间：April 1, 1998
• 年：1998
• 卷：32
• 期：7
• 页码：870 - 875
• 全文大小：126K
• 年卷期：v.32,no.7(April 1, 1998)
• ISSN：1520-5851

文摘

Surface complexation models (SCMs) have been successfully used to describe metal ion adsorption on puremineral materials. However, such models have rarelybeenapplied to model adsorption on natural materials. Inthisstudy, the surface complexation model approach wasused to describe the surface properties and adsorptionbehavior of natural aquatic sediment. Three typicalversionsof the surface complexation model were used: constantcapacitance model (CCM), diffuse layer model (DLM), andtriple layer model (TLM). All the model parametersweredetermined on the basis of the experimental data of the potentiometric titration and the metal adsorption isothermusing LeAn River (China) sediment. The experimentaldataof the adsorption edges were used to verify theperformanceof the models. This work indicated that all threemodelscan simulate the experimental results very well. Inpredicting the adsorption behavior of the sediment sample,the relative errors of these three models were quiteclose.The results illustrate that SCMs can be used tosuccessfully model natural materials.