【作者】 杨合；

【导师】 左良； 薛向欣；

【作者基本信息】 东北大学 ， 材料学， 2005， 博士

【摘要】 光催化实用技术已经成为功能材料与环境保护研究领域的热点。本文从复合矿综合利用、固体废弃物再资源化、环境污染防治和半导体光催化材料制备的低成本化出发，提出将含钛高炉渣、高钛渣和钛精矿作为光催化材料原料进行综合利用的新方法。以亚甲基蓝降解率为评价指标，讨论了处理后的含钛高炉渣、高钛渣和钛精矿作为光催化材料的光催化性能及影响因素，制备了含钛高炉渣中的纯矿物，并研究了其光催化性与杂离子加入的关系。进行了含钛高炉渣、高钛渣和钛精矿作为光催化材料降解溶液中染料活性艳红X-3B和邻硝基酚的实验研究，并进行了含钛高炉渣、高钛渣和钛精矿的抗菌效果研究。 首先以我国攀钢、承钢和马钢三种含钛高炉渣为原料制备光催化材料，以亚甲基蓝降解率为评价指标，研究了三种含钛高炉渣的光催化活性与炉渣中TiO₂含量、粉体粒度、热处理温度及稀土氧化物掺杂量的关系，研究了熔融结晶对炉渣光催化活性的影响。结果表明，三种含钛高炉渣均具有光催化活性，但因其TiO₂含量差异而光催化活性有显著差异，随着炉渣粉体粒度减小光催化活性显著增加，炉渣光催化活性与热处理温度有关，800℃恒温处理炉渣光催化活性最好。稀土氧化物CeO₂掺杂和熔融结晶均能提高炉渣光催化活性。为探讨含钛高炉渣的光催化机理，实验分别制备和选用了钙钛矿、尖晶石和透辉石单矿物，制备了掺杂Fe₂O₂、CeO₂和V₂O₅的钙钛矿固溶体，对钙钛矿、尖晶石和透辉石进行了光催化性研究，结果表明，钙钛矿具有较好的光催化性能，而透辉石和尖晶石无光催化性，钙钛矿的光催化活性与掺杂离子种类和掺杂量有关，当少量加入CeO₂和Fe₂O₃时，钙钛矿光催化活性显著提高，而加入V₂O₅时，钙钛矿光催化效果明显下降。复合掺入CeO₂和Fe₂O₃的钙钛矿光催化活性更好。 以亚甲基蓝降解率为评价指标，进行了高钛渣和钛精矿的光催化性的实验研究。研究了高钛渣和钛精矿光催化活性与热处理温度、稀土氧化物CeO₂和La₂O₃的掺杂的关系。结果表明，800℃处理的高钛渣和200℃处理的钛精矿光催化效果较为显著。稀土氧化物La₂O₃的掺杂对高钛渣和钛精矿的光催化性能均具有负面影更多还原

【Abstract】 The application of photocatalytic technology to functional materials and environmental protection has attracted great attention of researchers. In the present work, a new method to apply titania-bearing blast furnace slag （TBBFS）, high-titania slag （HTS） and concentrated titania ore （CTO） as the raw materials for making photocatalytic materials was proposed, aiming at an integrated utilization of resources and low-cost fabrication of semiconducting photocatalytic materials. Through photocatalytic degradation of methylene blue （MB） solution, photocatalytic activities of the three materials after treatment and the influencing factors were investigated. Pure minerals that exist in the TBBFS were prepared to investigate the effect of impurity ions on photocatalytic activities. The degradation of reactive brillian red （X-3B） and orth-nitrophenol by the TBBFS, HTS and CTO and their antibacterial effect were studied.Photocatalytic materials were made using three kinds of slag from Panzhihua Iron and Steel Corporation, Chengde Iron and Steel Corporation, and Maanshan Iron and Steel Corporation, respectively, and their photocatalytic activities were evaluated by the degradation ratio of MB solution. The effect of TiO₂ content, particle size of the powder, heat treatment temperature, rare earth oxide content, and melting-crystallization on photocatalytic activities was investigated. All the tree slag materials show photocatalytic activities, but they vary greatly with TiO₂ content. Photocatalytic activity increases with the decrease of particle size of the materials. Heat treatment temperature also influences photocatalytic activity of the materials, and the highest photocatalytic activity was achieved by heat-treating at 800℃. Photocatalytic activity can be improved by CeO₂ doping and a melting-crystallization treatment. In order to investigate photocatalytic mechanism of the titania-bearing blast furnace slag, pure minerals of perovskite, diopside and spinel were selected and their photocatalytic activity was investigated. The perovskite was doped by Fe₂O₃, CeO₂ and V₂O₅. The results show that perovskite has good photocatalytic activity, and diopside and spinel have no photocatalytic activity. Doping influences photocatalytic activity of the perovskite. Photocatalytic activity improves significantly by doping small amount of CeO₂ or Fe₂O₃, but deceases with the doping of V₂O₅. Doping with both CeO₂ and Fe₂O₃ can further improve the photocatalytic activity.Photocatalytic activity of the HTS and CTO was evaluated by the degradation of更多还原