Bi_(1-x)Y_(x)FeO_(3)光催化剂的表征及光催化分析研究

Characterization and Photocatalytic Analysis of Bi_(1-x)Y_(x)FeO_(3) Photocatalyst

为研究降解污水处理厂高浓度有机物废水监测提供理论基础和技术支持,分析乌鲁木齐市某污水处理厂的进水水样,通过控制Y利用凝胶溶胶法在500℃下煅烧2 h制备出不同Y掺杂量的BFO光催化纳米粉末,粉末粒径较小,约为5~6 nm,由不规则的颗粒团聚成球状且表面粗糙,随着Y掺杂量的增加,颗粒粒径逐渐减小,掺杂量能够增强可见光响应能力,有效抑制电子-空穴对的复合,提高光催化降解效率。研究表明,BFO光催化降解刚果红溶液时,纯铁酸铋对刚果红的降解率为35%左右,Y_(5)样品对刚果红的去除率可达到86%,比纯铁酸铋的降解效果增加56%左右。刚果红浓度与其初始浓度之比(C_(t)/C_(0))随时间的变化成指数关系,符合拟一级反应动力学方程。

This paper provides the theoretical basis and technical support for the study of the monitoring of high concentration organic waste water from degradation sewage treatment,and studies the influent samples from sewage treatment in Urumqi,by controlling Y,the photocatalytic nano-powders of BFO with different Y dopant content were prepared by calcination at 500℃for 2 hours.The size of the powders was small,about 5~6 nm,and the irregular particles agglomerated into spherical shape with rough surface,with the increase of Y doping amount,the particle size decreases gradually.The doping amount can enhance the response of visible light,restrain the recombination of electron-hole pairs and improve the photocatalytic degradation efficiency.The results show that the degradation rate of Congo red by bismuth ferrate is about 35%,and that of Congo red by Y_(5) is 86%,which is about 56%more than that of bismuth ferrate.The ratio of Congo red concentration to its initial concentration(C_(t)/C_(0))changes exponentially with time and fits the first order chemical kinetics equation.