Integration of separation and photocatalysis using an inorganic membrane modified with Si-doped TiO2 for water purification
Integration of separation and photocatalysis using an inorganic membrane modified with Si-doped TiO2 for water purification
复制标题
使用掺硅 TiO2 改性的无机膜集分离和光催化于水净化
DOI：
10.1016/j.memsci.2009.02.040
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发表时间：
2009-06
影响因子：
9.5
通讯作者：
Zhao, Huimin
中科院分区：
文献类型：
--
作者：
Chen, Shuo;Ma, Ning;Quan, Xie;Zhang, Yaobin;Zhao, Huimin
为了在水净化过程中在单个装置中实现过滤和光催化，制备了具有Si掺杂TiO2层的不对称无机膜。以钛酸四正丁酯[Ti(OC4H9)4, TBOT]和原硅酸四乙酯[Si(OC2H5)4, TEOS]为TiO2前驱体和Si元素源，采用溶胶-凝胶技术在商用Al2O3膜上涂覆Si掺杂TiO2光催化层。扫描电子显微镜（SEM）和透射电子显微镜（TEM）表征表明Si掺杂的TiO2薄层具有纳米多孔膜结构。紫外可见漫反射光谱（DRS）和X射线衍射（XRD）图谱表明，所制备的膜表面具有强烈的紫外吸收，这归因于TiO2材料的锐钛矿相。通过重复涂覆过程对Si掺杂TiO2层的厚度进行可控性，膜的透水性和聚乙二醇(PEG)保留与TiO2层的厚度相关。与单独光催化或膜分离相比，在紫外照射下使用该膜对模型污染物染料活性红ED-2B（RR ED-2B）的去除效率明显提高，这表明模型污染物是同时分离和降解的。复合膜的多功能性能预示着该装置在水净化过程中可能会变得更加强大。
An unsymmetrical inorganic membrane with Si-doped TiO2layers was fabricated for the purpose of realizing filtration and photocatalysis in a single device in water purification process. Tetra-n-butyl titanate [Ti(OC4H9)4, TBOT] and tetraethyl orthosilicate [Si(OC2H5)4, TEOS] were used as precursors of TiO2and Si element source, and Si-doped TiO2photocatalytic layer was coated on a commercial Al2O3membrane by sol–gel technique. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterization demonstrated that the Si-doped TiO2thin layer possessed nanoporous membrane structure. The results of UV–vis diffuse reflectance spectra (DRS) and X-ray diffraction (XRD) pattern indicated that a strong UV absorption of as-prepared membrane surface was ascribed to anatase phase of TiO2materials. The thickness controllability of Si-doped TiO2layer was conducted by repeated-coating procedure, and water permeability and polyethylene glycol (PEG) retention of membrane were related with thickness of the TiO2layer. The removal efficiency of model pollutant, dye Reactive Red ED-2B (RR ED-2B), was improved obviously using the membrane under UV irradiation in comparison with photocatalysis or membrane separation alone, which demonstrated that the model pollutant was separated and degraded simultaneously. The multifunctional performance of composite membrane hints this unit may become more powerful in water purification process.
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