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首页> 外文会议>Symposium on Surface-Active Process in Materials, Cocoa Beach, Florida, January 25-29, 1999 >TiO_2 Ceramic Surfaces with Catalytic Reactivity in Ultrapure Water Technology
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TiO_2 Ceramic Surfaces with Catalytic Reactivity in Ultrapure Water Technology

机译：超纯水技术中具有催化活性的TiO_2陶瓷表面

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摘要

The reactivity of titanium dioxide (TiO_2) surfaces, including TiO_2 / polymer composites, for oxidative removal of trace organic compounds from ultrapure water by a catalytic pervaporation process is demonstrated in this study. The membrane matrix material used is polydimethylsiloxane (PDMS), a ceramic precursor material, which forms the membrane matrix. PDMS is selective for the removal of organic compounds fro mwater. In the PDMS matrix catalytically active TiO_2 particles with anatase type crystal structure are imbedded. On the surface of the TiO_2particles hydroxyl and perhydroxyl radicals are formed in aqueous environment upon exposure to UV light which leads to oxidation of organic compounds. Thus by running pervaporation experimetns with these catalytic membranes, oxidation of organic compounds at the feed/membrane interface as well as inside of the membrane is achieved. Isopropyl alcohol (IPA) and acetone are used as organic model compounds. As a result, partial and complete oxidation of IPA and acetone as well as simultaneous permeation of the oxidation products and the feed compounds could be observed during the catalytic pervaporation experiments.
机译：本研究证明了包括TiO_2 /聚合物复合物在内的二氧化钛（TiO_2）表面通过催化渗透蒸发过程从超纯水中氧化去除微量有机化合物的反应性。所使用的膜基质材料是形成膜基质的陶瓷前体材料聚二甲基硅氧烷（PDMS）。 PDMS对去除水中的有机化合物具有选择性。在PDMS基质中嵌入具有锐钛矿型晶体结构的催化活性TiO_2颗粒。暴露在紫外线下，在水性环境中会在TiO_2颗粒的表面形成羟基和过羟基基团，从而导致有机化合物的氧化。因此，通过在这些催化膜上进行全蒸发实验，可以实现进料/膜界面以及膜内部有机化合物的氧化。异丙醇（IPA）和丙酮用作有机模型化合物。结果，在催化渗透蒸发实验期间，可以观察到IPA和丙酮的部分和完全氧化，以及氧化产物和进料化合物的同时渗透。

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