Modified inorganic polymer flocculant-PFSi: its preparation, characterization and coagulation behavior.
Modified inorganic polymer flocculant-PFSi: its preparation, characterization and coagulation behavior.
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DOI：
10.1016/s0043-1354(01)00034-3
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发表时间：
2001-10
期刊：
影响因子：
12.8
通讯作者：
Dongsheng Wang;Hong-xiao Tang
中科院分区：
文献类型：
--
作者：
Dongsheng Wang;Hong-xiao Tang
无机高分子絮凝剂作为一种新型的水处理剂，正处于快速发展的趋势。其中，没有任何毒性问题的铁基IPF备受期待。本文研究了一种制备铁基IPF的新方法。制备了SiO_2 A、SiO_2 B和SiO_2 C三种改性剂，并以此为原料分别制备了PFSiA、PFSiB和PFSiC三种聚合硅酸铁（PFSi）。采用多种直接和间接形态分析方法，对三种PFSi的形态分布和特征进行了详细的研究。实验结果表明，PFSi的物种分布主要取决于引入的SiO2种类和采用的Si/Fe比。二氧化硅A和二氧化硅B在Fe（III）的水解过程中起沉淀防止剂的作用。在一定碱度下，随着Si/Fe比的增加，Fea（单体）增加，而Fec（胶体）明显减少。虽然Fecis的形成受到抑制，但Feb（低聚物或聚合物）的稳定化仍然不能实现。另一方面，SiO2 C对改性Fe（III）溶液的物种分布几乎没有影响。并考察了上述PFSi的混凝性能。二氧化硅的不同效果，然后讨论相对于化学物种。
As a new kind of water and wastewater treatment reagents, inorganic polymer flocculants (IPFs) are in a trend of rapid development. Among them, iron-based IPF without any toxic problems is greatly expected. In this paper, a new protocol for preparation of iron-based IPF is investigated. Three kinds of silica, named silicaA, silicaB and silicaC, are prepared and used as modifiers to tailor-make polyferric silicate (PFSi), denoted PFSiA, PFSiB and PFSiC, respectively, in accordance to the above silica. Based on several direct and indirect speciation methods, the species distribution and characteristic of three kinds of PFSi are investigated in detail. The experiment results show that the species distribution of PFSi is mainly decided by the kinds of silica introduced and Si/Fe ratio adopted. SilicaA and silicaB function as precipitation preventing reagents during the hydrolysis of Fe(III). At certain amount of basicity, Fea(monomers) increases with increase of Si/Fe ratio, while Fec(colloidal species) decreases markedly. Although the formation of Fecis inhibited, the stabilization of Feb(oligomers or polymers) can still not be achieved. SilicaC on the other hand exhibits little effect on the species distribution of modified Fe(III) solutions. The coagulation behavior of above PFSi is also examined. The different effect of silica is then discussed with respect to the chemical species.