纳米二氧化钛光催化降解活性染料的研究.pdf

纳米二氧化钛光催化降解活性染料的研究摘要妥善解决水危机是新世纪下人们的当务之急,而水资源的有效利用成为解决这一问题的出路。如果处理过的废水、污水的各项指标能够满足工业、农业以及生活的使用标准,那么水危机状态将会得到极大的缓解。纳米半导体材料广泛应用于各种类型的废水处理,并且显现出实际应用的效果。本项研究主要是利用纳米半导体材料对模拟的染料废水进行光催化处理。纳米半导体材料是经过表面无机包覆以及预处理的粉体纳米二氧化钛。通常粉体状态下的Ti0。作为催化剂光催化降解有机污染物相对于负载的Ti0。膜有更高的效率。实验所采用的反应体系为悬浮反应体系,由于自制纳米Ti0。的优良性能,避免了大多数悬浮反应体系存在的问题:光催化剂难以回收再利用。()。在实验中,考察了催化剂的用量、有机污染物的初始浓度、pH值、光照距离、光源等外部因素对于整个光催化过程降解的作用。。对自制催化剂降解低浓度活性艳兰I(N—R的动力学规律进行了探讨。通过正交实验优化上述外部影响因素,将优化的实验条件运用到活性艳兰l(N—R的光催化降解机理研究中。在优化条件下对活性艳兰一R的光催化降解途径作厂合理的推测。同时,也将此种纳米催化剂应用到其它类型废水降解的过程中。在研究过程中获得了很好的实验处理效果。自制的纳米Ti02作为一种环境友好催化剂,有望投入实际应用。关键词:光催化,活性艳兰KN—R,降解,纳米二氧化钛 RESEARCH oFNANoMETER TITANIUM DIoXIDE PHoToCATAI YTICAL DEGRADATIoN oF REACTIVE DYESTUFFS INWASTEⅥ‘ATER ABSTRACT The most important thing foreveryone is todeal wellwiththecrisis of water shortage viableway tothe crisisis torationally use available water crisiswould bealleviated on thewhole levelifall treatedwastewater could apply towater ofindustry,agriculture semiconducting materialhasbeen usedwidely totreat various kinds wastwater,and shown obvious practical results. The thesis focused on treating thedyestuffs withthecatalyst inthe simulated treatment isactually thephotocatalysis with the powder of nanometer semiconducting material,which was anic coated ofnanometer titanium dioxide hasusually a better were loaded on tllesurface ofsome solid -prepared photo-catalyst Ti02 insuspending reactionsystem has another advantage:it iseasilyseparated from thewastewater,and main ingredient ofsimulated wastewater isthereactiveblue 19,which belongs toanthraquinone dyes. We studied theinfluencing factors externalfactorsinclude the use amount ofcatalyst,initial concentration of the dyestuff,pH value,illuminated distance and light ofdegradation effect was made between the