Speciation characterization and coagulation of poly-silica-ferric-chloride: the role of hydrolyzed Fe(III) and silica interaction.
Speciation characterization and coagulation of poly-silica-ferric-chloride: the role of hydrolyzed Fe(III) and silica interaction.
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DOI：
10.1016/s1001-0742(10)60471-8
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发表时间：
2011-05
影响因子：
6.9
通讯作者：
Jian Shi;Yan Zhang;Kai‐Min Zou;F. Xiao
中科院分区：
文献类型：
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作者：
Jian Shi;Yan Zhang;Kai‐Min Zou;F. Xiao
铁-硅系高效无机高分子絮凝剂是一种很有前途的新型絮凝剂。铁物种和二氧化硅之间的相互作用在悬浮液的混凝中起着很大的作用。这些效应与聚合二氧化硅或胶体二氧化硅相关的效应截然不同。然而，尽管这些物种是混凝效率的关键，但它们尚未被全面讨论。采用共聚法合成了一种新型混凝剂聚硅氯化铁（PFSC），并利用时间络合光谱和光子相关光谱对PFSC进行了表征。与传统铁盐相比，PFSC具有分子量大、正电荷少、铁含量低、铁含量高的特点。硅铁比越高，硅含量越高，硅含量越低，与适量聚硅酸复配的PFSC不仅具有更好的混凝除浊效果，提高了絮凝指数（FI），提供了更少的残余铁，而且与传统的铁盐相比，降低了水处理成本。结果表明，PFSC对水中胶体颗粒的去除主要是通过电中和、电吹扫、吸附架桥等机理实现的。
The highly efficient inorganic polymer flocculants (IPFs) of the ferric-silica system is a new and promising coagulant. Interactions between ferric species and silica play a large part in the coagulation of suspensions. These effects are quite distinct from those associated with polymeric or colloid silica. However, although these species are key to coagulation efficiency, they have not been comprehensively discussed. A new type of coagulant, poly-silica-ferric-chloride (PFSC), was synthesized by co-polymerization and characterized by time complexation spectroscopy and photon correlation spectroscopy. Compared with traditional ferric salt, the results indicated that PFSC had a higher molecular weight, lesser positive charge, lower Feband higher Fec. The higher the Si/Fe ratio, the higher the silica and lower the silica found. The PFSC with appropriate polysilica acid not only obtained better coagulation/flocculation efficiency in turbidity removal, enhanced the flocculation index (FI) and provided less residual ferric, it also lowered water treatment costs compared to traditional ferric salt. Results showed that PFSC could remove colloid particles in water by charge neutralization and sweeping, adsorption bridging mechanism.