电化学氟化提高TiO2薄膜光电催化性能  

Enhancement of photoelectrocatalytic performance of TiO2 thin films by electrochemical fluorination

作　　者：李想 张林[1] 杨波[2] 吴雅琴[2] LI Xiang;ZHANG Lin;YANG Bo;WU Ya-qin(College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Research and Development Center of Water Treatment Technology Co.Ltd.,Hangzhou 310012,China)

机构地区：[1]浙江大学化学工程与生物工程学院,浙江杭州310027 [2]杭州水处理技术研究开发中心有限公司,浙江杭州310012

出　　处：《高校化学工程学报》2020年第3期710-717,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点研发计划(2017YFC0403701);浙江省海水淡化技术研究重点实验室(2012E10001);杭州市重大科技创新(20182013A02)。

摘　　要：为了提高二氧化钛(TiO2)薄膜光电性能,采用电化学氟化制备氟化二氧化钛薄膜(F-TiO2),优化电压、时间、氟离子浓度对F-TiO2光电性能的影响,考察F-TiO2薄膜光电催化As(Ⅲ)和苯酚的性能,并测试F-TiO2薄膜光吸收性质,F-TiO2在400℃焙烧后光电流以及TiO2薄膜电极在含氟水溶液中光电流,分析F-TiO2光电催化性能提高的原因。结果表明:最佳氟化条件为10 V、5 min、0.5%NaF;在0.8 V,N2条件下,F-TiO2稳态光电流提高约2.6倍;在0.8V,空气条件下,光电催化As(Ⅲ)和苯酚速率提高2.0倍左右。电化学表面氟化形成化学键氟可能是提高TiO2光电催化性能的主要因素。In order to improve the photoelectrocatalytic performance of titanium dioxide(TiO2) thin films,a fluorinated titanium dioxide(F-TiO2) thin film was prepared by electrochemical fluorination TiO2 in acid solution containing NaF.Effects of voltage,time and fluoride ion concentration on the properties of F-TiO2 were monitored.Photoelectrocatalytic of the target pollutants of As(Ⅲ) and phenol were also investigated.The optical absorption properties of F-TiO2,the photocurrent of F-TiO2 after annealed at 400℃ and the photocurrent of TiO2 in acid solution containing NaF were measured,and the possible reasons for the improvement of photoelectrocatalytic performance of F-TiO2 were analyzed.The results show that the optimum fluorination conditions are 10 V,5 min and 0.5% NaF.Under the optimum fluorination conditions,the steady state photocurrent of F-TiO2 increased by 2.6 times at 0.8 V in N2 condition and the rates of photoelectrocatalytic As(Ⅲ) and phenol improved by approximately 2.0 times at 0.8 V with air bubbled.The formation of chemical bond fluorine by electrochemical surface fluorination may be the main factor to improve the performance of TiO2.

关 键 词：氟化TiO2 薄膜电极 光电催化性能 As(Ⅲ)氧化 苯酚降解 

分 类 号：O643.3[理学—物理化学]