[Preparation of polyaluminum silicate chloride (PASC) from tetraethylorthosilicate (TEOS) and its physicochemical characteristics].
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 27Al 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 Al13 species. All the above advantages of PASC(A) are due to its special synthesis method.
Zhao
Hua-zhang
HZ
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. huazhangzhao@hotmail.com
Wang
Hong-yu
HY
Zuo
Hua
H
Luan
Zhao-kun
ZK
Pei
Yuan-sheng
YS
D000538:Aluminum Silicates / Q000737:chemistry*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D011108:Polymers; D012821:Silanes / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D000538:Aluminum Silicates; D011108:Polymers; D012821:Silanes; C040733:tetraethoxysilane