CNTs-CeO_2/H_2O_2复合光催化氧化体系降解水中酸性橙Ⅱ

Degradation of acid orangeⅡin water by CNTs-CeO_2/H_2O_2 composite photocatalytic oxidation system

运用'化学沉淀法',将Ce O2负载到碳纳米管(CNTs)上制备复合光催化剂,采用'单因素实验法'优化了制备条件。运用透射电镜和X射线衍射仪对复合光催化剂进行了表征。结果表明,负载到CNTs上的Ce O2为多晶面心立方结构,尺寸大小在6~10 nm之间,其在CNTs上分散效果好,负载均匀且负载率高。在溶液p H为5,CNTs-Ce O2用量为0.50g/L并光照2 h后,酸性橙Ⅱ的光脱色率和TOC去除率分别达到64.71%和44.25%;加入0.02 mmol/L H2O2后,CNTsCe O2/H2O2复合体系对酸性橙Ⅱ的光脱色率和TOC去除率分别提高至91.35%和82.40%。这预示着CNTs-Ce O2/H2O2复合光催化氧化体系在对水中偶氮染料的光催化处理方面具有潜在的应用价值。

Ce O2 were loaded onto the carbon nanotubes( CNTs) to prepare composite photocatalyst using chemical precipitation method. The preparation conditions were optimized by single factor experiment method. The composite photocatalyst prepared were characterized by transmission electron microscope and X-ray diffractometer. The results showed that the Ce O2 loaded onto the CNTs appears polycrystalline face centered cubic structure,the size of Ce O2 loaded on CNTs is between 6 ~ 10 nm,Ce O2 is well dispersed on the carbon nanotubes with good loading effect and high loading efficiency. Under the conditions of p H 5,CNTs-Ce O2 dosage of 0. 50 g / L and illumination time of 2 h,the photocatalytic decolorization rate and TOC removal rate of acid orange II attained64. 71% and 44. 25%,respectively. After adding 0. 02 mmol / L H2O2 solutions into the reaction system,the photocatalytic decolorization rate and TOC removal rate by CNTs-Ce O2/ H2O2 composite system increased to 91. 35%and 82. 40%,respectively. This indicates that the CNTs-Ce O2/ H2O2 composite photocatalytic oxidation system has the potential application value in the photocatalytic treatment of azo dye in water.