掺杂金属离子对二氧化钛纳米光催化性能的影响
摘 要
纳米TiO2作为一种重要的绿色环保材料，引起许多研究人员的青睐。然而，因TiO2是宽禁带半导体(Eg-3.2eV)，只有在能量较高的紫外光照射下才表现出光催化活性，而太阳光中的可见光不能有效利用，同时光生电子与空穴的复合几率高，量子产率低，故上述诸缺陷极大地限制了该技术在实际中的广泛应用。
书签名言
针对TiO2光催化氧化技术存在的缺陷，提出了金属离子掺杂改性TiO2光催化剂的设想。本研究以钛酸四丁酯为钛源、无水乙醇为溶剂、冰醋酸为抑制剂，采用溶胶凝胶法来制备纳米二氧化钛光催化剂，通过往溶液中加入金属离子，使其进入TiO2晶粒中，改变掺杂元素、掺杂量和焙烧温度等考察对TiO2光催化活性的影响，同时借助XRD、TEM、UV-Vis等分析手段，表征了改性TiO有关运动会的作文2微观结构。以甲基橙模拟目标污染物，探讨了在紫外光和太阳光照射下该改性TiO2的光催化活性。实验发现掺杂了金属离子的TiO2颗粒对甲基橙的光催化效果有明显的提高，同等条件下掺铜和掺钴颗粒的催化效果要好于掺铁、锰，然而也发现该工艺未能使掺铬颗粒有催化效果。
美国空姐
关键词：二氧化钛，金属离子，光催化，甲基橙
Abstract
As an important green material, Nano-titanium dioxide has attracted much attention in the scientific rearch. However三国人物，TiO2 may show photo catalytic activity only under irradiation of ultraviolet(UV) light for its wide band gap (Eg-3.2eV), most of the sun light is underutilized .Furthermore，easy recombination of photo-induced electrons and holes makes the efficiency of photo quantum low. Tho unfavorable factors have the photo catalytic oxidation technique of TiO2 limited in Practice.
咖啡机品牌Considering the problems above，the idea of TiO2 photocatalysts by metal-doped-modified was prented. In this study, nano-titanium dioxide catalysts is prepared by sol-gel method with tetrabutyl titanate as titanium source，anhydrous alcohol as solvent and the acetic acid as inhibitor . Add the metal ions to the solution, then into the crystal particles. The effect of roasting temperature, doping elements content of doped on the photocatalytic activity was studied. The micro-structures of prepared photocatalysts were
characterized by XRD，TEM， UV-Vis analysis. Take methyl orange simulated as pollutants, discusd that the photocatalytic activity of the modified TiO2 in the sunlight and UV radiation. The studies found that the metal ions doped TiO2 caud significantly improved the photo catalysis activity of methyl orange.
Key words: titanium dioxide, metal ions doped, photocatalysis , ultraviolet light, sunlight, methyl orange
目 录
引 言 1
小微企业税收优惠
第一章 文献综述 3
1.1 TiO2纳米的光催化技术概述 3
1.2 TIO2光催化反应原理 3
周宣1.3 Ti02光催化剂掺杂改性作用机理 4
1.4 过渡金属离子掺杂 5
1.5 掺杂改性的Ti02光催化剂的制备方法 6
1.5.1 溶胶-凝胶法 6
哀皇后1.5.2 水热法 6
1.5.3 离子注入法 6
1.5.4 沉淀法 7
1.5.5 浸渍法 7
1.5.6 微乳液法 7
1.6 掺杂对TiO2光催化性能的影响 8
1.6.1离子掺杂对催化剂吸光性能的影响 8
1.6.2离子掺杂对电荷迁移过程的影响 9
