【作者】 王程；

【导师】 龚文琪；

【作者基本信息】 武汉理工大学 ， 矿物加工工程， 2005， 硕士

【摘要】 光催化氧化技术是近几十年来发展起来的一种深度氧化技术（advanced oxidation process,AOP）。它是将特定光源（如紫外光）与催化剂联合作用对有机污染物进行降解处理的过程。利用光催化氧化技术,大多数有机污染物可以被降解为CO₂、H₂O等无污染的小分子。因此,光催化氧化技术应用于环境污染物的治理已成为环境保护领域研究的热点。 利用这一技术的关键在于光催化材料的制备。因此,制备既高效又经济的光催化材料是目前研究者关心和迫切需要研究的问题。TiO₂因其具有效率高、能耗低、操作简便、反应条件温和、适用范围广、可减少二次污染等优点而被认为是诸多光催化材料中最有应用前途的一种材料,因此是目前研究的热点。 本论文介绍了半导体光催化理论、TiO₂光催化基本原理、纳米TiO₂光催化材料的制备、提高TiO₂光催化材料光催化活性的途径、TiO₂光催化材料的应用、TiO₂光催化材料负载技术的研究进展以及目前存在的问题等。 通过粉碎、分级等手段制备了天然金红石光催化材料。用制备的天然金红石光催化材料处理含偶氮染料废水,结果表明其对偶氮染料的作用既有吸附,也有降解,表明天然金红石光催化材料有一定的光催化活性。 选用四种不同结构和性质的矿物,分别是架状结构的辉沸石、石英,层状结构的累托石、高岭土,采用溶胶-凝胶法制备了矿物负载纳米TiO₂光催化材料。用制备的光催化材料处理含偶氮染料废水,结果表明其对偶氮染料废水有较高的脱色率。辉沸石、累托石、高岭土负载纳米TiO₂光催化材料对偶氮染料的作用主要为吸附,石英负载纳米TiO₂光催化材料对偶氮染料的作用主要为降解。 用γ-巯丙基三甲氧基硅烷对石英进行干法改性,用氧化剂将巯基氧化为磺酸基,通过静电自组装TiO₂制备石英表面自组装纳米TiO₂光催化材料。用制备的光催化材料处理含偶氮染料废水,结果表明其对偶氮染料废水有较高的脱色率。其对偶氮染料有一定的吸附作用,但主要为降解作用。 运用XRD、XPS等测试手段对制备的光催化材料进行了表征以研究其组成。运用紫外-可见光扫描分析及红外光谱等测试手段研究了制备的光催化材料的光催化脱色作用机理。更多还原

【Abstract】 Photocatalysis oxidation process is a kind of advanced oxidation process which has developed for several decades. It is a process of organic pollutant degradation under the action of UV and photocatalyst. Most organic pollutants can be degraded to non-polluting small molecules such as CO₂, H₂O etc. Therefore, Photocatalysis oxidation process applied to environment pollution control has become the hotspot of environmental protection research.The key of using this technology is the preparation of photocatalyst. Therefore, preparing effective and economic photocatalyst is a problem which researchers care of and need to resolve. Because TiO₂ has high photocatalysis activity, low energy consumption, simple operation, gentle reaction condition, extensive application, with reduced secondary pollution etc., it is indeed a photocatalyst which has the best perspective and has become the hotdspot of the research.This paper introduced the theory of photocatalysis of semiconductor, the principle of TiO₂ photocatalysis, preparation of nanometer TiO₂, the approach of improving the photocatalytic activity of TiO₂, the application of TiO₂, and the research of loading techniques of TiO₂.Natural rutile photocatalyst was prepared with the method of grinding and sizing. This photocatalyst was used to treat wastewater containing azo dye. It shows that natural rutile photocatalyst has certain photocatalytic action on azo dye.Minerals of different structures were used to prepare mineral loading photocatalyst and study the effect of minerals and TiO₂. on wastewater treatment. Using these photocatalyst to treat wastewater containing azo dye showed that these photocatalysts have high decoloration effect.. The main action of TiO₂ loaded on stilbite, rectorite, kaolin on azo dye was adsorption . The main action of quartz loading TiO₂ photocatalyst on azo dye was photocatalysis.Surface modification was made on quartz with （ OCH₃ ）₃Si（CH₂）₃SH by dry process. The radical of -SH was oxidized to -SO₃^- and electrostatic self -assembled TiO₂ was made on the surface of quartz . By this way the self-assembled TiO₂ photocatalyst on quartz was prepared. Using this photocatalyst to treat wastewatercontaining azo dye showed that this photocatalyst has high decoloration effect.. The main action of this photocatalyst on azo dye is photocatalysis.XRD and XPS were used to study the composition of the photocatalyts . U V-vis and FTIR were used to analyse the mechanism of the photocatalytic action of the nano titanium dioxide photocatalyts.更多还原