水环境中不同浓度TiO_2纳米颗粒混凝工艺去除效果  

Removal of TiO_2 nanoparticles in water environment by coagulation process

作　　者：王秀蘅[1] 龚小娟[1] 尤世界[1] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2014年第2期38-43,共6页Journal of Harbin Institute of Technology

基　　金：城市水资源与水环境重点实验室资助项目(2012DX05)

摘　　要：为了探究水环境中不同质量浓度TiO2纳米颗粒(NPs)混凝工艺去除影响因素及与浊度去除规律的区别,研究了在超声预处理后投加表面活性剂(LAS)对TiO2NPs分散稳定性的影响,通过烧杯实验分别考察了混凝剂(聚合氯化铝,PAC)投加量及pH对不同质量浓度TiO2NPs和浊度去除的影响,及pH对TiO2NPs表面Zeta电位的影响机制.结果表明,在250 W超声处理10 min后加入20 mg/L的LAS获得的纳米悬浮液稳定性最好;不同混凝剂投加量下,TiO2NPs和浊度的去除规律呈相近趋势,TiO2NPs初始质量浓度为0.5,1和2 mg/L时,PAC最优投加量为3 mg/L,对应TiO2NPs和浊度最大去除率分别为46.2%、60.2%、68.8%和23.2%、43.6%、47.6%.TiO2NPs初始质量浓度为5 mg/L时,PAC最优投量为4 mg/L,TiO2NPs和浊度最大去除率分别为77.64%和54.08%.pH对TiO2NPs表面Zeta电位有明显影响,进而影响TiO2NPs的去除效果.To inquiry the factors of removal efficiency of different-concentration TiO2 NPs by coagulation processes and the difference between different-concentration TiO2 NPs and turbidity in removal performance. This paper investigated the impact of sonication pretreatment and surfactant （ LAS ） on the stability of TiO： nanoparticles （NPs） in solution firstly, for getting dispersion stabilized suspension. We also studied the effect of dosage of coagulant （PAC） on different-concentration TiO2 NPs based on jar test, and the dependence of surface zeta potential on pH. The results demonstrated that the best stability of TiO2 NPs was obtained at sonication power of 250 W for 10 rain under LAS concentration of 20 mg/L. The removal of TiO2 NPs and turbidity exhibited the similar trends under various coagulant concentrations. The optimum coagulation dosage was 3 mg/L at initial TiO2 NPs concentration of 0.5, 1 and 2 rag/L, which corresponded to removing efficiency of TiO2 NPs and turbidity of 46.2%, 60. 2%, 68.8% and 23.2%, 43.6%, 47.6% respectively. The optimum coagulation dosage of 4 mg/L for initial TiO2 NPs concentration of 5 mg/L resulted in removal of TiO2 NPs and turbidity of 77.6% and 54. 1%. The pH value was found to have significant impact to Zeta potential, and then has influence on the removal effect of TiO2 NP.

关 键 词：TIO2纳米颗粒 混凝实验 浊度 去除率 

分 类 号：TU991.2[建筑科学—市政工程]