FeVO_4可见光光催化降解有毒有机污染物  

Photodegradation of toxic organic pollutants by FeVO_4 under visible light irradiation

作　　者：饶志[1] 顾彦[1] 黄春迎[1] 何燕[1] 黄应平[1] 张爱清[2] 

机构地区：[1]三峡库区生态环境教育部工程研究中心(三峡大学),宜昌443002 [2]催化材料科学湖北省暨国家民委-教育部共建重点实验室(中南民族大学),武汉430070

出　　处：《环境化学》2013年第4期564-571,共8页Environmental Chemistry

基　　金：国家自然科学基金(20877048;50979049);湖北省高等学校优秀中青年科技创新团队计划(T200703);催化材料科学湖北省暨国家民委-教育部共建重点实验室开放基金(CHCl10007)资助

摘　　要：采用液相沉淀法制备了FeVO4光催化剂,以X射线衍射法(XRD)、X射线光电子能谱(XPS)、紫外可见漫反射(UV-Vis DRS)对其进行了表征.在可见光(λ≥420 nm)照射下,研究了FeVO4活化H2O2降解染料OrangeⅡ及无色小分子2,4-二氯苯酚(DCP)的光催化活性.同时优化了光催化剂FeVO4的制备条件、探讨了光催化降解OrangeⅡ体系中H2O2浓度、FeVO4用量及pH对其降解作用的影响.结果表明,在可见光照射下,H2O2浓度为1.50×10-3 mol.L-1,FeVO4量为0.17 g.L-1,pH值为6.4时,FeVO4对OrangeⅡ光催化降解活性最好,14 h后对OrangeⅡ的矿化率达到51.6%.在光催化反应条件下,12 h后对DCP的降解率达到64.3%,表明FeVO4具有可见光催化特性.运用ESR技术跟踪测定光催化降解过程中氧化物种的变化,发现FeVO4活化H2O2产生羟基自由基(.OH),表明FeVO4的光催化降解过程主要涉及.OH的氧化历程.Photocatalyst FeVO4 was prepared by liquid phase precipitation method, and characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and UV-Vis diffuse reflectance spectra （UV-Vis DRS）. The photodegradation of Orange Ⅱand 2, 4-dich]orophenol （DCP） by FeVO4 activating H2O2 under visible light illumination （λ≥ 420 nm） was used as probe reaction to explore the photocatalytie property of FeVO4. The effect of HEO2 concentration, FeVOg amount and pH on the photocatalytic activity was researched. The results demonstrated that FeVO4 had the best degradation efficiency under the conditions of H2O2 concentration 1.50 × 10-3 mol. L-1, FeVO4 amount 0. 17 g conditions, the mineralized rate of Orange II after 14 h and the degrada and pH 6.4. Under the optimal tion of DCP after 12 h were 51.6% and 64.3%, respectively. ESR results showed that the highly reactive oxygene species hydroxyl radical was produced during the reaction, which demonstrated that the degradation pro cess was dominated by generated in the system.

关 键 词：FEVO4 光催化 OrangeⅡ 

分 类 号：X50[环境科学与工程—环境工程] O643.32[理学—物理化学]