以Al-Ferron逐时络合比色法研究有机硅铝复合絮凝剂中铝的形态分布

Al Species Distribution of Organic Silicate Aluminum Hybrid Flocculants by Al-Ferron Complexation Timed Spectrophotometric Method

以正硅酸乙酯(TEOS)、二乙氧基二甲基硅烷(DEDMS)、γ-氨丙基二乙氧基甲基硅烷(APDES)这3种硅烷偶联剂为硅源,合成了新型的有机硅铝复合絮凝剂,利用Al-Ferron逐时络合比色法研究了这3种絮凝剂的铝形态分布.结果表明,3种系列有机硅铝复合絮凝剂中,硅源、碱化度(B)、Si/Al摩尔比对铝形态分布都有影响.其中,碱化度对铝形态的影响较大.3种产品表现出类似的变化趋势,随碱化度的增大,Ala含量呈现下降趋势,而Alb和Alc含量则明显上升.以TEOS为硅源的产品中,Alc为主要形态;以DEDMS为硅源的产品中,硅源对铝形态的影响不明显;以APDES为硅源的产品中,Alb则为主要形态,其含量随Si/Al摩尔比的增大而增多.

New types of organic silicate aluminum hybrid flocculants were prepared by employing Tetraethylorthosilicat （TEOS）, Diethoxydimethylsilane （ DEDMS）, γ-Aminopropylmethyldiethoxysilane （APDES） as silicon source. The Al species distribution in these new products was investigated by Al-Ferron complexation timed spectrophotometric method. The results show that silicon source, basicity （B） and Si/Al molar ratio have effect on the Al species distribution. Among them, basicity has greater effect, three sets of products have similar characteristics. The content of Ala declines with the rise of B value, while the contents of Alb, and Alc increase. AI,. is the dominant A1 species in the products with TEOS as silicon source. DEDMS has little contribution to the distribution of A1 species. In the products with APDES as silicon source, Alb is the dominant Al species while the content increases with the rise of Si/Al molar ratio.