The Preparation and Characterization of a New Solid Coagulant: Polymeric Ferric Silicate Sulfate
ZHU Guo-cheng1, LIU Jun-fei1,ZHOU Teng-zhi1, ZHANG Peng1, REN Bo-zhi1, ZHENG Huai-li2, LIU Yun-si1, LI Xue-mei1
1. College of Civil Engineering, Hunan University of Science & Technology, Xiangtan 411201, China 2. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
Abstract:As one of the most important water treatment agents, polysilicate coagulant, has been playing an important role in coagulation- flocculation, but it is prone to lose stability due to self-polymerization and the forming of silica gel. Therefore, research on the preparation of stable polysilicate coagulant has attract great attention. A new method to prepare a stable polysilicate coagulant (PSPF), was proposed in this paper. Its structure and morphology were characterized by using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) respectively. Fe species in PSPF was analyzed via Fe-Ferron complexation timed spectrophotometric method. The performance of PSPF was assessed by measuring micro-polluted water treatment efficiency. Primary chemicals, such as ferrous sulfate, sodium silicate, potassium dihydrogen phosphate, sodium carbonate, were used. The influence of those parameters affecting the preparation of PSPF, such as nSi/nFe, nP/nFe and nOH/nFe molar ratios were examined. The results showed that nSi/nFe of 1∶4, nP/nFe of 1∶6 and nOH/nFe of 1∶10 under 60 ℃ water bath for 30 min was the optimum condition for preparation. The FTIR spectrum indicated that PSPF was a kind of high molecular polymer, containing new groups (e.g., Si—O—Si and Fe—O—Si), which could increase the molecular weight,molecular chain and coagulation-flocculation efficiency. PSPF presented a cluster appearance similar to a network structure, which was conductive to adsorption-bridging capacity and precipitation sweeping. The increase of Fe(b) and Fe(c) as a result of Si increasing in PSPF improved the polymerization and solidification. The coagulation behaviors of PSPF that were largely affected by the coagulant dosage and pH, indicated that for pH and dosage at 6 and 8 mg·L-1, respectively, the residual turbidity and UV254 removal efficiency could achieve 0.33 NTU and 58.6%, respectively.
朱国成1,柳俊斐1,周腾智1,张 鹏1,任伯帜1,郑怀礼2,刘运思1,李学美1 . 新型固体聚硅硫酸铁混凝剂的制备及结构表征[J]. 光谱学与光谱分析, 2016, 36(08): 2455-2461.
ZHU Guo-cheng1, LIU Jun-fei1,ZHOU Teng-zhi1, ZHANG Peng1, REN Bo-zhi1, ZHENG Huai-li2, LIU Yun-si1, LI Xue-mei1. The Preparation and Characterization of a New Solid Coagulant: Polymeric Ferric Silicate Sulfate. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(08): 2455-2461.