光谱学与光谱分析, 2016, 36 (4): 1038, 网络出版: 2016-12-20  

聚合硫酸铁钛混凝剂的制备及红外、 紫外-可见光谱分析

Study on the Preparation of A New Composite Coagulant: Poly-Ferric-Titanium-Sulfate and Analysis of FTIR Spectrum and UV-Vis Spectrum
作者单位
重庆大学三峡库区生态环境教育部重点实验室, 低碳绿色建筑国际联合研究中心, 重庆 400045
摘要
复合混凝剂由于其具有优异的混凝性能而受到越来越广泛的关注, 但与钛离子络合的铁基复合混凝剂的制备和表征还鲜有报道。 研究以Ti(SO4)2为配合物, PO3-4为稳定剂和络合剂制备了聚合硫酸铁复合混凝剂钛(PFTS)。 主要利用红外光谱(FTIR)、 紫外-可见光谱(UV/VIS)表征分析了PFTS在不同Ti/Fe, P/Fe, OH/Fe物料配比下对化学基团, 分子结构变化的影响。 结果表明, Ti4+和PO3-4的加入, 不是以单一离子形态存在, 而是生成了诸如Ti—O, —Fe—P—Fe—和—Ti—P—Ti—等有助于增大聚合物分子量的基团键, 而一定比例的Ti/Fe和P/Fe配比有助于物料单体相互络合生成诸如—Fe—P—Ti—的基团键和Fe6(OH)6+12, [Fex(OH)y]2H2PO(6x-2y-1)+4等类型的中聚体结构, 此比例在P/Fe为0.2—0.3, Ti/Fe为1∶8比较恰当。 过高的P/Fe比, Ti/Fe比和OH/Fe会生成TiO2, Ti3(PO4)4和FePO4沉淀或高聚体络合物, 不利于混凝性能的发挥。
Abstract
Composite coagulants have drawn a widespread attention recently for its superior coagulation-flocculation performance. Fe and Ti based coagulants, as a kind of inorganic metal water treatment agent, h have received huge attention, but there is little study about the preparation and characterization of composite coagulate composite with Ti4+. In this paper we prepared a composite coagulant, in which the Ti (SO4)2 was introduced as coordination complexes, PO3-4 as stabilizer and complexant. Then, the FT-Infra Red spectrum (FT-IR) and ultraviolet/visible absorption spectrum (UV-Vis) were adopted to characterizse the changes of chemical group, species distribution of coagulants in case of varies Ti/Fe, P/Fe and OH/Fe molar ratio. The results shows other than simple mixture of the raw materials, the introduction of Ti4+ and —PO4 group synthesized the chemical group bond as Ti—O, —Fe—P—Fe— and —Ti—P—Ti—, which were beneficial to the degree of polymerization and increased the stability of the product. Furthermore, when the Ti/Fe molar ratio of 1∶8, P/Fe was in the range of 0.2~0.3, the optimal material is suitable for the generation of Fe—P—Ti— chemistry bond and medium polymer as Fe6(OH)6+12, [Fex(OH)y]2H2PO(6x-2y-1)+4. Whereas, too much addition of Ti4+, PO3-4 and HCO-3 deteriorated the polymer structure, leading to the presentation of precipitate as TiO2, Ti3(PO4)4 and FePO4, which will decrease the coagulation performance.

陈伟, 郑怀礼, 翟俊, 赵纯, 薛文文, 蔡娜, 杨青青, 冯力. 聚合硫酸铁钛混凝剂的制备及红外、 紫外-可见光谱分析[J]. 光谱学与光谱分析, 2016, 36(4): 1038. CHEN Wei, ZHENG Huai-li, ZHAI Jun, ZHAO Chun, XUE Wen-wen, CAI Na, YANG Qing-qing, FENG Li. Study on the Preparation of A New Composite Coagulant: Poly-Ferric-Titanium-Sulfate and Analysis of FTIR Spectrum and UV-Vis Spectrum[J]. Spectroscopy and Spectral Analysis, 2016, 36(4): 1038.

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