复合纳米Fe_2O_3/TiO_2可见光催化降解邻甲酚溶液的研究  

Composite photocatalyst Fe_2O_3/TiO_2 treatment of o-cresol solution by photocatalysis oxidation

作　　者：程莹莹[1] 陈建林[1] 杨凯[1] 王仪春[1] 

机构地区：[1]南京大学环境学院

出　　处：《环境污染与防治》2005年第7期543-546,共4页Environmental Pollution & Control

摘　　要：以复合纳米Fe2O3/TiO2作为催化剂,日光色镝灯为光源,研究了邻甲酚溶液的可见光降解。考察了催化剂制备方法、催化剂使用量、溶液pH、催化剂重复使用等条件对可见光降解的影响。实验结果表明,1%Fe2O3/TiO2(n)对邻甲酚溶液的可见光降解效果最优,比TiO2(p25)的降解率提高了2.6倍。在实验条件下,可见光降解3h,邻甲酚溶液的浓度去除率达95.4%,TOC去除率为72.3%。在较宽的浓度范围内,邻甲酚的反应服从一级动力学反应方程,随着浓度的增大,反应速率常数不断降低。Photocatalysis degradation of o-cresol was studied using Fe2O3/TiO2 nanoparticles as photocatalyst and reflector sunlight dysprosium lamp as light source. The effects of preparation methods, reusability of the catalyst, catalyst content, solution pH and o-cresol initial concentration were examined. The tests show that using 1% Fe2O3/TiO2 nanoparticles prepared by impregnation method as photocatalyst can increase o-cresol gradation rate by 2. 6 times on comparison with TiO2（P25）nanoparticles. Under experimental conditions, the concentration removal rate of o-cresol is 95.4% and the TOC removal rate is 72.3% after photogradation of 3 h. When the concentration of o- cresol in a wider range, reaction fitted the fist-order kinetics and the reaction speed constant decreases with increasing concentration.

关 键 词：可见光 催化氧化 Fe2O3/TiO2 纳米Fe2O3 溶液pH TIO2 邻甲酚 光催化降解 复合 TOC去除率 

分 类 号：X703[环境科学与工程—环境工程] TQ175.716[化学工程—硅酸盐工业]