| 共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究 |
| 摘要点击 2457 全文点击 2711 投稿时间：2008-06-29 修订日期：2008-09-01 |
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| 中文关键词 共价键 硅铝复合絮凝剂 硅烷偶联剂 27肁l NMR 腐殖酸 |
| 英文关键词 covalent bonded aluminum silicon hybrid flocculants silane coupling agent 27Al NMR humic acid |
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| 中文摘要 |
| 利用3种硅烷偶联剂——正硅酸乙酯（TEOS）、二乙氧基二甲基硅烷（DEDMS）、γ 氨丙基二乙氧基甲基硅烷（APDES）分别与氯化铝合成了共价键型硅铝复合絮凝剂，利用27肁l NMR研究了其铝形态分布，并试验了其对腐殖酸配水的混凝效果.27肁l NMR结果表明，硅源、碱化度（B茫i/Al摩尔比对铝形态都有影响.以TEOS为硅源的产品中，未检出的铝形态含量较多.而以APDES为硅源的产品中，Al13玫暮拷细撸⑺鍿i/Al摩尔比的增大而增多.碱化度对3种产品中铝形态的影响相似，表现为Al单含量随着B弥档脑龃蠖档?当Si/Al摩尔比为0.4时，以TEOS为硅源的产品中一直未出现Al13茫訢EDMS为硅源的产品在高B弥担?.5）下出现Al13茫訟PDES为硅源的产品在低B弥担?.5）下即出现Al13?混凝实验结果表明，在酸性条件下，以APDES为硅源的产品的最佳投药范围较宽，处理效果最好.而碱性条件下以TEOS为硅源的产品的处理效果略优于另外2种硅铝复合絮凝剂. |
| 英文摘要 |
| Covalent bonded aluminum silicon hybrid flocculants were synthesized by employing tetraethylorthosilicate (TEOS) and two silane coupling agents［diethoxydimethylsilane (DEDMS), γ aminopropylmethyldiethoxysilane (APDES)］ as silicon sources, respectively. The distribution of Al species was investigated by 27l NMR method and the coagulation behavior was evaluated by treating synthetic water containing humic acid. The results of 27l NMR show that silicon source, Si/Al molar ratio and basicity (B exhibit effect on the Al species distribution. In the products with APDES as silicon source, the highest content of Al13 was obtained and its amount increases with the rise of Si/Al molar ratio. The effect of B alue on the Al species is similar for the three sets of flocculants. The content of monomeric species decreases with the rise of B alue. At Si/Al=0.4, there are no Al13 bserved throughout the Bvalue range in the products with TEOS as silicon source. Al13 tarts to appear at a higher B alue of 1.5 for the products with DEDMS as silicon source and a lower B value of 0.5 for that with APDES as silicon source, respectively. The coagulation results show that, in acidic conditions, the best dosage range of the flocculants with APDES as silicon source is the widest of the three, resulting in the best coagulation efficiency. In alkaline conditions, the coagulation efficiency of the products with TEOS as silicon source is slightly better than the other two. |
