聚磷硫酸铁复合絮凝剂中铁的形态分布研究

摘要

Based on the strong polymeric role of phosphate (PO34-) on the PFS, PO34- was introduced in the ferric sulfate (PFS), and a new type of composite flocculant polymeric phosphate ferric sulfate (PPFS) was developed. The study includes the preparation of PPFS, and erric species distribution in PFSS was investigated by ultraviolet-visible spectrum method, infrared spectrum method and Fe-ferron complexation timed spectrophotometry method. The ultraviolet-visible spectrum showed that the change in the spectral curve of the different pH polymer ferric sulfate flocculants is corresponding to the flocculation morphology. Infrared spectra showed that the -P-O or -P=O vibration exists in the PPFS, certificated the ferric ion in PFS and phosphate caused the reaction, and produced the phosphate ferric polymer; and Fe-ferron complexation timed spectrophotometry showed that the amount of Fe(c) in polymeric phosphate ferric sulfate (PPFS) flocculants was the most in the three species,while the amount of Fe(a) and Fe(b) was small, that is PPFS mainly exists in the form of phosphate ferric polymer.%基于磷酸根(PO43-)对聚合硫酸铁的强增聚作用,在聚合硫酸铁(PFS)中引入PO43-,研制出一种新型复合絮凝剂聚磷硫酸铁(PPFS).研究内容包括:聚磷硫酸铁的制备,用Ferron法研究PPFS中铁形态分布、用紫外可见光谱分析法研究PPFS中铁形态分布、用红外光谱分析法研究PPFS中铁形态分布.研究结果表明:紫外可见光谱显示不同pH条件下PPFS絮凝剂的光谱曲线变化与其絮凝形态有一定的对应关系;红外光谱显示PPFS中存在-P-0-或-P=O的振动,表明PFS中的铁离子与磷酸发生了反应,生成磷铁聚合物;逐时络合比色法显示PPFS絮凝剂中Fe(c)形态较多,Fe(a)和Fe(b)含量相对较少,表明PPFS主要以铁磷高聚物形式存在.