摘要
在光催化剂TiO2存在条件下,利用光化学方法对模拟活性染料废水进行处理,考察了不同波长、光照强度、染料浓度、染液pH和催化剂投加浓度等因素的影响。实验结果表明:随着染料浓度降低、反应时间延长和光照强度增加,染料降解效果增强,254nm波段紫外光源对染料的降解效果明显好于365nm,蒽醌染料比偶氮染料更难降解。染料的降解机理可能是染料分子的发色基团首先被破坏,形成无色有机中间产物,随后才是中间产物的降解过程,染料从大分子结构逐步变为小份子结构并最终被矿化。
A new method of photocatalytic degradation reactive dyes has been developed,and the factors of wavelength of UV source,light intensity,dye concentration,pH and catalyst concentration was investigated,in the presence of TiO2.The results showed that,lower concentration of dyes,stronger radiation would degradated the dyes more clearly in a longer reaction time.UV at 254nm was more capable at photocatalysis degradation than UV at 365nm.Anthraquinone dye KN-R was more difficult to degradate than azo dye brilliant X-3B.The degradation mechanisms of dyes were supposed to be the chromophoric groups were firstly destroyed into achromic intermediates,then the intermediates were destroyed,and finally were mineralized.
出处
《武汉科技学院学报》
2010年第4期23-26,共4页
Journal of Wuhan Institute of Science and Technology
基金
国家十一五863计划项目(2009AA063904)
国家自然科学基金项目(50978208)
武汉纺织大学校基金项目(20063119)
