文章摘要
紫外光/过氧化氢协同作用下TiO2/碳纳米管中空纤维膜水处理性能
Performance of TiO2/CNT Hollow Fiber Membrane for Water Treatment under Assistance of UV and H2O2
投稿时间:2018-05-02  修订日期:2018-05-29
DOI:
中文关键词: 光催化分离膜  H2O2  UV  苯酚  水处理
英文关键词: Photocatalytic membrane  H2O2  UV  Phenol  Water treatment
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
于然 大连理工大学 环境学院 工业生态与环境工程重点实验室 yuran0201@mail.dlut.edu.cn 
陈硕 大连理工大学 环境学院 工业生态与环境工程重点实验室 shuochen@dlut.edu.cn 
范新飞 大连理工大学 环境学院 工业生态与环境工程重点实验室  
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中文摘要:
      本文提出了一种过氧化氢(H2O2)协同光催化膜分离技术,通过向光催化膜分离过程中投加H2O2,在光催化、紫外光(UV)/H2O2过程和光芬顿过程的协同下拓宽活性物种产生路径,进而提高膜的水处理能力。通过湿法纺丝-异相成核法制备了二氧化钛(TiO2)/碳纳米管(CNT)中空纤维膜,该过程避免了TiO2高温转晶的过程,且TiO2和CNT的复合可以形成异质结结构,在一定程度上抑制TiO2光生电子空穴对的再结合,有助于提高光催化效率。苯酚处理实验显示,H2O2协同TiO2/CNT中空纤维膜过程可以在停留时间为1.5 s时实现对苯酚的高效降解,去除率达59.2%。分离实验表明,运行120 min后,H2O2协同光催化膜过程膜通量基本维持不变,分别是单独膜分离过程、光催化膜分离过程、H2O2协同膜分离过程的2.5,1.3,1.7倍。
英文摘要:
      A H2O2-assisted photocatalytic membrane system was proposed in this work. By introducing the H2O2 into photocatalytic membrane process, three possible paths are involved: (1) photocatalysis; (2) the UV/H2O2 process; (3) the photo-Fenton reaction. All of these processes are able to produce the active species, which have strong oxidizing ability and favor for the degradation of pollutants in water. To verify this, a TiO2/CNT hollow fiber membrane (HFM) was prepared through vacuum-filtration and heterogeneous nucleation methods. This kind of method avoids the crystal transformation of TiO2 in high temperature. Meanwhile, the composite of CNT and TiO2 can construct the heterojunction structure to inhibit the recombination of photo-induced electron-hole pairs, and then improve the photocatalysis efficiency. Phenol was selected as the target pollutant to evaluate the water treatment ability of H2O2-assisted TiO2/CNT HFM. Result shows the phenol removal efficiency of UV/H2O2 assisted TiO2/CNT HFM is up to 59.2% with a 1.5 s retention time (after running for 120 min). Separation test process shows the flux of TiO2/CNT HFM is kept almost stable with UV/H2O2, which is 2.5-fold, 1.3-fold and 1.7-fold higher than that of the membrane, photocatalytic membrane and membrane with H2O2 (without UV) processes, respectively (after running for 120 min).
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