净化室内甲醛催化剂的制备及其性能研究-毕业论文.doc

论文题目: 净化室内甲醛催化剂的制备及其性能研究专业:环境工程摘要近年来,室内空气污染问题已经引起人们的广泛关注,其中甲醛是室内空气质量评价的主要因子,故如何通过净化技术治理甲醛成为国内外室内污染问题的热点。光催化氧化技术是近几十年来发展起来的一项深度氧化污染治理新技术, 其降解彻底、无二次污染。光催化剂 TiO 2 由于具有抗化学和光腐蚀、价廉、无毒、粒径小、比表面积大、光催化效率高等优点,在治理环境污染中逐渐受到人们的高度重视。本研究设计了动态气路和静态气路,模拟甲醛浓度为 3的室内。然后以钛酸丁酯为前驱体,冰醋酸为水解抑制剂, 无水乙醇为溶剂,采用溶胶-凝胶法制备纳米二氧化钛,煅烧温度为 500 ℃。并研究了负载不同量的人造沸石,硅胶,制作催化剂,研究对甲醛的降解能力。同时采用 SEM 电镜扫描表征了负载后 TiO 2的性质。研究发现,负载了人造沸石,硅胶的 TiO 2净化效果明显高于 TiO 2催化剂。人造沸石的最佳负载量为 1:50 ,硅胶的最佳负载量为 1:40 。降解效果人造沸石优于硅胶,加入相同量的催化剂时,降解率人造沸石大约是硅胶的2倍。最后研究了光氧化甲醛气体降解过程的反应动力学,得出硅胶和沸石负载二氧化钛均接近于一级动力反应模型, 甲醛的光催化反应与反应初始浓度有关。关键词: 甲醛,动态,静态, 光催化, TiO 2,负载,人工沸石, 硅胶论文类型: 应用型 Subject : Study on preparation and performance of purify indoor formaldehyde catalyst Specialty : Environmental Engineering ABSTRACT In recent years, The problem of indoor air pollution has already caused the people's extensive concern, formaldehyde isa main factor of indoor air quality assessment , sohow to through the purification technology at home and abroad over formaldehyde e the hot spot of the indoor pollution problem. Light catalytic oxidation technology is developed a depth and new oxidation pollution control technology in recent decades ,It degradation is thorough and no secondary pollution . With its ability of the corrosion resistance of chemical and light, inexpensive, non-toxic, small size, large surface area and photocatalytic efficiency, Light TiO2 chemical resistance is paid more and more attention in environmental pollution control. This study design of dynamic and static gas path, simulation for formaldehyde concentration mg/m 3of indoor. Then titanate with butyl acetate precursor for body, glacial acetic acid hydrolysis for inhibitors, no water ethanol as solvent, using sol-gel method nanometer tio2, calcining temperature of500 ℃. And the load varying amounts of artificial zeolite, silicone, making catalyst, study the ability to formaldehyde degradation. In the same time, by using SEM using scanning electron microscopy (SEM) represent the load