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(SO_4)_2为配合物,PO_4^(3-)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,Ti^(4+)和PO_4^(3-)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Fe_6(OH)_(12)^(6+),[Fe_x(OH)_y]_2H_2PO_4^((6x-2y-1)+)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TiO_2,Ti_3(PO_4)_4和FePO_4沉淀或高聚体络合物,不利于混凝性能的发挥。
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 Ti^4＋.In this paper we prepared a composite coagulant,in which the Ti（SO_4）_2 was introduced as coordination complexes,PO_4^3-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 Ti^4＋ and —PO_4 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 Fe_6（OH）_（12）^6＋, [Fe_x（OH）_y]2H_2PO_4^（6x-2y-1）＋.Whereas,too much addition of Ti^4＋,PO_4^3-and HCO_3^- deteriorated the polymer structure,leading to the presentation of precipitate as TiO_2,Ti_3（PO_4）_4and FePO_4,which will decrease the coagulation performance.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2016年第4期1038-1043,共6页
Spectroscopy and Spectral Analysis
基金
国家科技部重大水专项课题(2013ZX07312-001-03-03)
2014年重庆大学研究生科研创新项目(CYB14045)
高等学校学科创新引智计划(B13041)资助
关键词
混凝剂
聚合硫酸铁
硫酸钛
紫外-可见光谱法
红外光谱法
Coagulant
Polyferric Sulfate
Titanous sulfate
FT-IR spectrophotometry
UV-Vis spectrophotometry
作者简介
陈伟，1987年生，重庆大学三峡库区生态环境教育部重点实验室博士研究生e-mail：chenwei0835@foxmail．com
通讯联系人e-mail：zhl@cqu．edu．cn
