• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Nanocrystalline TiO_2 Photocatalytic Membranes with a Hierarchical Mesoporous Multilayer Structure: Synthesis, Characterization, and Multifunction
【24h】

Nanocrystalline TiO_2 Photocatalytic Membranes with a Hierarchical Mesoporous Multilayer Structure: Synthesis, Characterization, and Multifunction

机译：具有多层介孔多层结构的纳米TiO_2光催化膜：合成，表征和多功能。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A novel sol-gel dip-coating process to fabricate nanocrystalline TiO_2 photocatalytic membranes with a robust hierarchical mesoporous multilayer and improved performance has been studied. Various titania sols containing poly(oxyethylenesorbitan monooleate) (Tween 80) surfactant as a pore-directing agent to tailor-design the porous structure of TiO_2 materials at different molar ratios of Tween 80/isopropyl alcohol/acetic acid/titanium tetraisopropoxide = R:45:6:1 have been synthesized. The sols are dip-coated on top of a homemade porous alumina substrate to fabricate TiO_2/Al_2O_3 composite membranes, dried, and calcined, and this procedure is repeated with varying sols in succession. The resulting asymmetric mesoporous TiO_2 membrane with a thickness of 0.9 μm exhibits a hierarchical change in pore diameter from 2-6, through 3-8, to 5-11 nm from the top to the bottom layer. Moreover, the corresponding porosity is incremented from 46.2, through 56.7, to 69.3%. Compared to a repeated-coating process using a single sol, the hierarchical multilayer process improves water permeability significantly without sacrificing the organic retention and photocatalytic activity of the TiO_2 membranes. The prepared TiO_2 photocatalytic membrane has great potential in developing highly efficient water treatment and reuse systems, for example, decomposition of organic pollutants, inactivation of pathogenic microorganisms, physical separation of contaminants, and self-antifouling action because of its multifunctional capability.
机译：研究了一种新颖的溶胶-凝胶浸涂工艺，该工艺制备了具有稳健的多层介孔多层膜和改善的性能的纳米晶TiO_2光催化膜。包含聚氧乙烯脱水山梨糖醇单油酸酯（Tween 80）表面活性剂作为孔隙导向剂的各种二氧化钛溶胶，可根据Tween 80 /异丙醇/乙酸/四异丙氧基钛= R：45的不同摩尔比量身定制TiO_2材料的多孔结构：6：1已合成。将溶胶浸涂在自制的多孔氧化铝基材上，以制造TiO_2 / Al_2O_3复合膜，干燥并煅烧，然后依次重复此过程，并更改溶胶。所得的厚度为0.9μm的不对称中孔TiO_2膜从上层到下层的孔径从2-6到3-8到5-11 nm呈分层变化。此外，相应的孔隙率从46.2％增至56.7％，增至69.3％。与使用单一溶胶的重复涂覆工艺相比，分层多层工艺可显着提高水渗透性，而不会牺牲TiO_2膜的有机保留率和光催化活性。所制备的TiO_2光催化膜由于具有多种功能，在开发高效的水处理和回用系统方面具有巨大的潜力，例如，有机污染物的分解，病原微生物的失活，污染物的物理分离以及自防污作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号