Covalently bound organic silicate aluminum hybrid coagulants: preparation, characterization, and coagulation behavior.
Covalently bound organic silicate aluminum hybrid coagulants: preparation, characterization, and coagulation behavior.
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DOI：
10.1021/es802965v
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发表时间：
2009-02
影响因子：
11.4
通讯作者：
Huazhang Zhao;Jian-xiong Peng;Shrong-Shi Lin;Yan Zhang
中科院分区：
文献类型：
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作者：
Huazhang Zhao;Jian-xiong Peng;Shrong-Shi Lin;Yan Zhang
以二甲基二乙氧基硅烷（DEDMS）和γ-氨丙基甲基二乙氧基硅烷（APDES）为硅源，合成了钴基有机硅酸铝复合混凝剂。使用另一种硅烷-正硅酸乙酯（TEOS）合成另外的混凝剂用于比较。红外光谱分析表明，以DEDMS和APDES为硅源的混凝剂都是共价结合的。所有三个混合混凝剂的特点是pH值，zeta电位，铝物种分布，和透射电子显微镜（TEM）分析。结果表明，硅源对铝的化学和物理结构、铝的形态分布以及电化学特性有显著影响。其中以APDES为硅源的混凝剂zeta电位值最高，Al 13含量最高，且混凝剂具有网状聚集体的特征。通过对含腐殖酸（HA）人工合成水的混凝处理，考察了3种复合混凝剂的混凝性能。以APDES为硅源的复合混凝剂在HA去除和浊度去除方面表现出最好的混凝性能，这是由于zeta电位、Al物种分布和有机官能团的组合。
Covalently bound organic silicate aluminum hybrid coagulants were synthesized by employing two silane coupling agents [diethoxydimethylsilane (DEDMS), gamma-aminopropylmethyldiethoxysilane (APDES)] as silicon sources. An additional coagulant was synthesized using anothersilane-tetraethylorthosilicate (TEOS) for comparison. Both the coagulant with DEDMS and that with APDES as the silicon source were shown to be covalently bound by infrared (IR) analysis. All three hybrid coagulants were characterized by pH, zeta potential, Al species distribution, and transmission electron microscopy (TEM) analysis. The results indicated that the silicon source played a significant role in aspects of the chemical and physical structure, Al species distribution, and electrochemistry characteristics. Specifically, the coagulant with APDES as the silicon source featured the highest zeta potential value, the highest content of Al13, and reticulated aggregate. The coagulation behaviors of the three hybrid coagulants were also investigated by treating synthetic water containing humic acid (HA). The hybrid coagulant with APDES as the silicon source exhibited the best coagulation behavior in terms of HA removal and turbidity removal, due to the combination of the zeta potential, Al species distribution, and organic functional groups.