共查询到19条相似文献,搜索用时 125 毫秒
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纳米二氧化钛光催化的研究进展及应用 总被引:1,自引:0,他引:1
针对近年来TiO2光催化的研究和应用进展,对纳米TiO2的制备方法、光催化机理及其影响因素进行了综述,指出光源种类、光源强度、体系的反应温度、体系的pH值等是影响TiO2催化速率和效率的主要因素,在此基础上总结出提高纳米TiO2光催化活性方法,对掺杂半导体材料和表面改性两种主要方式进行了归纳,介绍了TiO2作为光催化剂在环境领域的应用及使用寿命,提出了TiO2作为光催化剂的发展趋势。 相似文献
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综述了近年来具有光催化活性的纳米二氧化钛颗粒及薄膜的低温制备研究新进展,按水热法、溶胶-凝胶法及沉淀法分类介绍了纳米二氧化钛的低温制备的反应原理、产物性能及优缺点,评述了二氧化钛在高分子材质上的负载化研究进展,并展望了该领域的研究前景。 相似文献
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评述了制备二氧化钛薄膜的液相法、气相法和电化学法3大类方法的优缺点,以及3大类方法所包含的溶胶-凝胶、微乳液、磁控溅射、物理气相沉积、化学气相沉积、阳极氧化和微弧氧化等方法制备二氧化钛薄膜的工艺步骤、特点及研究进展.文章最后指出,液相法由于自身存在的优点,仍将是今后二氧化钛薄膜制备和研究的重点;而光催化性能更好的掺杂二氧化钛,其研究重点是探讨掺杂方式、制备方法和优化配比等. 相似文献
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N掺杂TiO2材料可见光光催化性能研究进展 总被引:1,自引:0,他引:1
概括了最近报道的N掺杂TiO2可见光光催化材料的研究成果,其中包括样品制备的进展、掺杂机理的研究和可见光响应理论的研究。在制样方法方面,分析了不同方法制备的样品在性能上的特点和差异;在掺杂机理研究方面,归纳了目前研究中对N掺杂TiO2机理的不同观点,包括N在TiO2晶格中的位置以及N掺入后对TiO2半导体能级结构的影响;最后详细介绍了几种N掺杂TiO2可见光响应理论。 相似文献
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Qing Guo Chuanyao Zhou Zhibo Ma Xueming Yang 《Advanced materials (Deerfield Beach, Fla.)》2019,31(50)
Photocatalysis has been widely applied in various areas, such as solar cells, water splitting, and pollutant degradation. Therefore, the photochemical mechanisms and basic principles of photocatalysis, especially TiO2 photocatalysis, have been extensively investigated by various surface science methods in the last decade, aiming to provide important information for TiO2 photocatalysis under real environmental conditions. Recent progress that provides fundamental insights into TiO2 photocatalysis at a molecular level is highlighted. Insights into the structures of TiO2 and the basic principles of TiO2 photocatalysis are discussed first, which provides the basic concepts of TiO2 photocatalysis. Following this, details of the photochemistry of three important molecules (oxygen, water, methanol) on the model TiO2 surfaces are presented, in an attempt to unravel the relationship between charge/energy transfer and bond breaking/forming in TiO2 photocatalysis. Lastly, challenges and opportunities of the mechanistic studies of TiO2 photocatalysis at the molecular level are discussed briefly, as well as possible photocatalysis models. 相似文献
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Aiyun Meng Liuyang Zhang Bei Cheng Jiaguo Yu 《Advanced materials (Deerfield Beach, Fla.)》2019,31(30)
Semiconductor photocatalysis is recognized as a promising strategy to simultaneously address energy needs and environmental pollution. Titanium dioxide (TiO2) has been investigated for such applications due to its low cost, nontoxicity, and high chemical stability. However, pristine TiO2 still suffers from low utilization of visible light and high photogenerated‐charge‐carrier recombination rate. Recently, TiO2 photocatalysts modified by dual cocatalysts with different functions have attracted much attention due to the extended light absorption, enhanced reactant adsorption, and promoted charge‐carrier‐separation efficiency granted by various cocatalysts. Recent progress on the component and structural design of dual cocatalysts in TiO2 photocatalysts is summarized. Depending on their components, dual cocatalysts decorated on TiO2 photocatalysts can be divided into the following categories: bimetallic cocatalysts, metal–metal oxide/sulfide cocatalysts, metal–graphene cocatalysts, and metal oxide/sulfide–graphene cocatalysts. Depending on their architecture, they can be categorized into randomly deposited binary cocatalysts, facet‐dependent selective‐deposition binary cocatalysts, and core–shell structural binary cocatalysts. Concluding perspectives on the challenges and opportunities for the further exploration of dual cocatalyst–modified TiO2 photocatalysts are presented. 相似文献
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纳米锐钛矿TiO2光催化剂用于室温下固相光催化降解等离子体改性聚氯乙烯(PVC)薄膜的研究.对薄膜进行了扫描电子显微镜(SEM)、傅立叶红外光谱(FI-IR)、X光电子能谱(XPS)分析.结果表明,400 W紫外光辐射60 h后,PVC质量损失为1.393%;等离子体改性PVC-TiO2质量损失为1.966%,这表明TiO2加速了高分子碳链的断裂和光氧化.在等离子体改性PVC-TiO2表面形成大量的裂纹,XPS显示光催化降解后在等离子体改性PVC-TiO2的表面的C和Cl的原子浓度分别为83.15%和0.89%,达到最小值.等离子体改性的PVC的降解机理是等离子体改性PVC后,在PVC表面生成的自由基诱发了TiO2的光催化氧化的·OH自由基反应. 相似文献
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从光吸收过程、表面态光生载流子的俘获和光催化量子效率方面详细地阐述了光催化机理,并概述了TiO2系光催化剂在环境物质净化处理和太阳能转换利用等.最后总结了TiO2系光催化剂的研究现状,如掺杂改性、合成介孔尺度的纳米结构TiO2等. 相似文献
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在弱酸性环境下,采用微弧氧化法在钛基板表面实现了TiO2陶瓷的制备,并就施加电压和微弧氧化的时间对陶瓷薄膜的光催化性能进行了研究.结果显示,较高的阳极电压和较长的微弧氧化时间有利于制备光催化性能优良的TiO2陶瓷薄膜. 相似文献