Adsorption of cadmium onto Al₁₃-pillared acid-activated montmorillonite

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• 作者：Liang-guo Yan ; Xiao-quan Shan ; Bei Wen ; Gary Owens
• 关键词：Al₁₃-pillared acid-activated montmorillonite ; Al₁₃ ; Cd²⁺ ; Adsorption kinetics ; Hysteretic desorption
• 刊名：Journal of Hazardous Materials
• 出版年：2008
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 August 2008
• 卷：156
• 期：1-3
• 页码：499-508
• 文件大小：625 K

摘要

The optimal preparation conditions for Al₁₃-pillared acid-activated Na⁺-montmorillonite (Al₁₃-PAAMt) were (1) an acid-activated Na⁺-montmorillonite (Na⁺-Mt) solution of pH 3.0, (2) a OH⁻/Al³⁺ molar ratio of 2.4 and (3) Al³⁺/Na⁺-Mt ratio of 1.0 mmol g⁻¹. The effects of OH⁻/Al³⁺ and Al³⁺/Na⁺-Mt ratios on the adsorption of Cd²⁺ onto Al₁₃-PAAMt were studied. A comparison of the adsorption of Cd²⁺ onto Al₁₃-PAAMt, Al₁₃-pillared Na⁺-montmorillonite (Al₁₃-PMt) and Na⁺-Mt suggested that Al₁₃-PAAMt had higher adsorption affinity for Cd²⁺ than the other two adsorbents. A pseudo-second-order model described the adsorption kinetics well. Cadmium adsorption followed the Langmuir two-site equation, while desorption was hysteretic.