Chemical modification of silica-gel with hydroxyl- or amino-terminated polyamine for adsorption of Au(III)

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• 作者：Rongjun Qu ; Minghua Wang ; Changmei Sun ; Ying Zhang ; Chunnuan Ji ; Hou Chen ; Yanfeng Meng ; Ping Yin
• 关键词：Chemically modified silica-gel ; Preparation ; Characterization ; Adsorption ; Au(III)
• 刊名：Applied Surface Science
• 出版年：2008
• 出版时间：30 December 2008
• 年：2008
• 卷：255
• 期：5, Part 2
• 页码：3361-3370
• 全文大小：1310 K

文摘

Silica-gel chemically modified by γ-aminopropyltrimethoxysilane (APTS) reacted with methyl acrylate (MA) to form esterified silica-gel SiO₂–MA, and then SiO₂–MA reacted with ethanolamine (EA), diethanolamine (DEA), ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) respectively to obtain five novel adsorbents, hydroxyl-terminated polyamine functionalized silica-gels (SiO₂–EA and SiO₂–DEA) and amino-terminated ones (SiO₂–EDA, SiO₂–DETA, and SiO₂–TETA). Their structures were characterized by FTIR, WAXD, thermal analysis, and elemental analysis. The investigation of adsorption kinetics of the five adsorbents for Au(III) under different temperatures showed that all the adsorption processes were endothermic in nature. The amino-terminated polyamine grafted silica-gels exhibited higher adsorption rates than the hydroxyl-terminated ones. The Langmuir model was better than Freundlich model to fit the adsorption isotherms of the five products for Au(III).