以TEOS为硅源的聚硅氯化铝絮凝剂的制备及其物化特征  

Preparation of Polyaluminum Silicate Chloride (PASC) from Tetraethylorthosilicate (TEOS) and Its Physicochemical Characteristics

作　　者：赵华章[1] 王红宇[1] 左华[1] 栾兆坤[1] 裴元生[1] 

机构地区：[1]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085

出　　处：《环境科学》2004年第2期67-72,共6页Environmental Science

基　　金：国家 8 63重大专项课题 (2 0 0 2AA60 12 90 );国家自然科学基金资助项目(5 0 1780 67)

摘　　要：采用TEOS为硅源合成制备了新型的聚硅氯化铝PASC(A) ,并与传统方法合成的聚硅氯化铝PASC(B)做了比较 ,探讨了产品的 pH值和Zeta电位随B值和Si/Al摩尔比的变化关系 ,并利用酸解反应和2 7AlNMR研究了硅引入对PASC分子结构和铝形态的影响 .结果表明 ,由于采用了特殊的合成方法 ,与PASC(B)相比 ,PASC(A)具有更高的聚合度 ,分子量分布并且分子中铝硅分布均匀 ,不易被酸解聚 ,而且有利于Al13 形态稳定性 .A new type of polyaluminum silicate chloride [PASC(A)] was prepared by employing tetraethylorthosilicate (TEOS) as silicon source. By comparing PASC(A) with the conventional product [PASC(B)], the effects of B value and Si/Al molar ratio on the pH value and the Zeta potential of PASC(A) were investigated. The influence of the incorporation of silicon into PASC on the molecular structure and aluminium species was also studied by acidification method and 27 Al NMR spectroscopy. The results show that the PASC(A) has higher polymerization degree, narrow distribution of molecular weight and symmetrical distribution of aluminium and silicon in PASC molecule. It is more difficult to be acidified, and moreover, it can reduce the loss of Al 13 species. All the above advantages of PASC(A) are due to its special synthesis method.

关 键 词：聚硅氯化铝(PASC) 正硅酸乙酯(TEOS) 形态表征 Al13形态稳定性 

分 类 号：X703.3[环境科学与工程—环境工程]