TiO_2光催化耦合SO_4^-·体系对硝基苯酚的降解性能及动力学  

Degradation performance and kinetics for p-Nitrophenol by TiO_2 photocatalysis combined with sulfate radical system

作　　者：唐海[1] 沙俊鹏 颜酉斌[1] 蔡昌凤[1] 王军刚 

机构地区：[1]安徽工程大学生物与化学工程学院,芜湖241000 [2]重庆三峡环保(集团)有限公司,重庆401147

出　　处：《环境工程学报》2016年第1期205-211,共7页Chinese Journal of Environmental Engineering

基　　金：安徽省自然科学基金资助项目(1608085ME118);高校优秀青年人才支持计划重点项目(gxyq ZD2016120);安徽省自然科学重点项目(KJ2013A047)

摘　　要：利用溶胶-凝胶法在改性的ZSM-5分子筛上负载TiO_2制备复合光催化剂TiO_2/ZSM-5m,采用扫描电镜、N2吸附-脱附等温线和X射线衍射对材料进行表征。通过耦合Fe^(2+)/S_2O_8^(2-)产硫酸根自由基SO_4^-·体系,以对硝基苯酚(pNP)为目标污染物,系统考察了初始pH、TiO_2/ZSM-5m投加量、FeSO_4、Na_2S_2O_8浓度和初始浓度对pNP降解性能的影响。结果表明,在TiO_2/ZSM-5_m投加量为0.8g/L,pH为4.0,FeSO_4为0.4g/L,Na_2S_2O_8为2.4g/L,常温下反应240min的优化条件下,对pNP(初始浓度50mg/L)去除率达到99.31%,光催化降解动力学符合Langmuir-Hinshelwood模型,UV-vis图谱推测对硝基苯酚分子结构发生改变,被有效降解。The TiO2 loaded in modified ZSM-5molecular sieve composite photocatalyst TiO2/ ZSM-5mwas prepared by the sol-gel process,which was characterized by scanning electron microscope（ SEM）,N2 adsorption desorption isotherms and X-ray diffraction. Combined with sulfate radical SO4^-· system produced by Fe^2＋/S2O8^2-,the influences of initial pH,TiO2/ ZSM-5mdosage,concentration of FeSO4,Na2S2O8 and the initial concentration were investigated using p-Nitrophenol（ p NP） as an object pollutant. The results show that the removal rate of pNP（ 50 mg / L） reached 99. 31% under the optimization conditions： TiO2/ ZSM-5m dosage of 0. 8 g / L,pH of 4. 0,FeSO4 of 0. 4 g / L,Na2S2O8 of 2. 4 g / L and reaction time of 240 min at room temperature,degradation dynamics of pNP fits well Langmuir-Hinshelwood model. UV-vis indicated that the pNP molecular structure was changed and degraded efficiently.

关 键 词：TiO2/ZSM-5m 硫酸根自由基 对硝基苯酚 Langmuir-Hinshelwood模型 

分 类 号：X703[环境科学与工程—环境工程]