Equilibrium, thermodynamic, and kinetic of Cr(VI) adsorption using a modified and unmodified bentonite clay

查看全文 作　　者：D.J.L. [1]Guerra;I. [1]Mello;L.R. [1]Freitas;R. [1]Resende;R.A.R. [1]Silva

机构地区：[1]Department of Mineral Resources, University Federal of Mato Grosso DRM-UFMT, Mato Grosso 78060900, Brazil

出　　处：《International Journal of Mining Science and Technology》索引2014年第24卷第4期,共11页

基　　金：MCT, CNPq, and CAPES for financial supports and fellowships 摘　　要：The capacities of natural and modified Brazilian bentonite samples as adsorbents to remove hexavalent metal chromium were investigated under several conditions in batch and column methods. The raw material, Ca-bentonite, was modified by anchorament of 3-aminopropyltrietoxisilane(APS) and 3,2-aminoethylaminopropyltrimetoxisilane(AEAPS) in the surface of bentonite sample. This type of new occurrence of bentonite is suitable as a raw material for adsorption process. Adsorption behavior of three bentonite types was strongly depending on pH of adsorbate solution, contact time adsorbent/adsorbate,and initial concentration of Cr(VI). The results were confirmed by column method and reveals that the adsorption process of materials accorded by the Redlich-Peterson, Sips, Dubinin-Radushkevich, and Langmuir isotherm models. The exothermic enthalpic values reflected a favorable energetic process for chromium ions anchored in the material surfaces. The negative Gibbs free energy results supported the spontaneity of three adsorption reactions with Cr(VI) ions. 关键词：改性膨润土吸附动力学铬(VI) 热力学平衡粘土吉布斯自由能材料表面

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Equilibrium, thermodynamic, and kinetic of Cr(VI) adsorption using a modified and unmodified bentonite clay

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