| 引用本文: | 王秀蘅,龚小娟,尤世界.水环境中不同浓度TiO2纳米颗粒混凝工艺去除效果[J].哈尔滨工业大学学报,2014,46(2):38.DOI:10.11918/j.issn.0367-6234.2014.02.008 |
| WANG Xiuheng,GONG Xiaojuan,YOU Shijie.Removal of TiO2 nanoparticles in water environment by coagulation process[J].Journal of Harbin Institute of Technology,2014,46(2):38.DOI:10.11918/j.issn.0367-6234.2014.02.008 |
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| 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TiO2 NPs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TiO2 NPs和浊度去除的影响,及pH对TiO2 NPs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,TiO2 NPs和浊度的去除规律呈相近趋势,TiO2 NPs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TiO2 NPs和浊度最大去除率分别为46.2％、60.2％、68.8％和23.2％、43.6％、47.6％．TiO2 NPs初始质量浓度为5 mg／L时,PAC最优投量为4 mg／L,TiO2 NPs和浊度最大去除率分别为77.64％和54.08％．pH对TiO2 NPs表面Zeta电位有明显影响,进而影响TiO2 NPs的去除效果． |
| 关键词: TiO2纳米颗粒 混凝实验 浊度 去除率 |
| DOI：10.11918/j.issn.0367-6234.2014.02.008 |
| 分类号: |
| 基金项目:城市水资源与水环境重点实验室资助项目(2012DX05). |
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| Removal of TiO2 nanoparticles in water environment by coagulation process |
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WANG Xiuheng, GONG Xiaojuan, YOU Shijie
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(State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 150090 Harbin, China)
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| Abstract: |
| 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 TiO2 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 min 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 mg／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. |
| Key words: TiO2 nanoparticles (NPs) turbidity coagulation experiment removal rate |
