高浓度复合型聚铁硅絮凝剂PFSS和PSFS的形态分布研究

Study on the species distribution of PFSS and PSFS

采用紫外分光光度法、逐时络合比色法和红外图谱从不同角度对高浓度聚合硫酸铁硅和聚合硅酸铁的形态分布及转化规律进行了探讨。紫外吸收表明,聚铁硅絮凝剂中主要以Fe(OH)+2、Fe2(OH)4+2等二聚体为主,而且还有三聚体或其他聚合形态的存在;逐时络合分析显示,复合型聚铁硅体系中硅形态以Si(c)为主,铁形态以Fe(a)和Fe(c)为主;红外图谱证实高浓度聚铁硅是以羟桥为主结构连接的高分子复合物,在1100cm-1附近M—OH—M的振动证明有铁羟基及其聚合态存在,且其形态区别于PFS。

Species distribution and transformation law of PFSS and PSFS were probed by some techniques such as ultraviolet spectrophotometric method, Fe-ferron complexation timed spectrophotometry and infared spectrum method. The results showed that the main species in PFSS and PSFS were dimers Fe （ OH ）2^＋ and Fe2（OH）2^4＋ , meanwhile some trimers or other species probably exist. According to Fe-ferron complexation timed spectrophotometry, silicate species were mainly Si（c） , Fe-species are Fe（a） and Fe（c） in the Si-Fe system, the infared spectrum indicated that the structure of this new flocculant was hydroxy-bridged, different from PFS, and the vibration of the M-OH-M around 110 cm^-1 also proved that its main species were polymers .