双极液膜法可见光光催化降解染料废水

中国环境科学2014，34(6)：1463-1470ChinaEnvironmenta1Science双极液膜法可见光光催化降解染料废水徐云兰，李珏秀，钟登杰，胡学步，贾金平。(1．重庆理工大学化学化工学院，重庆400054；2．上海交通大学环境科学与工程学院，上海200240)摘要：采用溶胶一凝胶法制各了Bi2O3-TiO2厂n膜电极，x射线衍射(XRD)、X射线光电子能谱(XPS)、紫外一可见漫反射(DRS)和光电性能测试进行了表征，结果表明，Bi元素掺杂进入了TiO2催化剂，拓展了催化剂的光响应波长，使其在可见光下有较明显的光电响应．将Bi203-TiO2／Ti光阳极与cu阴极组装成双极液膜反应器，在可见光下光催化处理活性艳红x一3B，得出当初始pH值为2．52，废水流量为80mL／min时，处理20megL活性艳红X一3B150min，脱色率可达88％．双极液膜法可见光光催化的初步机理考察表明，光生电子自发由Bi2O3-TiO2表面转移到cu电极表面，并在cu电极表面直接还原染料，或与其表面液膜中的溶解氧反应生成H2O2，进而参与染料的氧化，由此可实现Bi2O3-TiO2／Ti的直接氧化和cu阴极的直接还原和间接氧化的双极双效效果．关键词：双极液膜反应器：Bi2O3-TiO2FFi膜电极：光催化；废水；可见光：降解中图分类号：X52文献标识码：A文章编号：1000—6923(2014)06—1463—08Dualelectrodesphotocatalyticdegradationofdyewastewaterundervisiblelightirradiation．XUYun-lan，LIJue-xiu，ZHONGDeng-jie。’，HUXue-bu，JIAJin—ping(1．SchoolofChemicalEngineering，ChongqingUniversityofTechnology,Chongqing400054．China；2．SchoolofEnvironmentalScienceandEngineering，ShanghaiJiaotongUniversivy，Shanghai200240，China)．ChinaEnvironmentalScience，2014，34(6)：1463-1470Abstract：Bi2O3-TiO2／1rithinfilmelectrodeshavebeenpreparedbysol-gelmethod．ThecharacterizationofX-raydifraction(xRD)，X-rayphotoelectronspectroscopy(xPs)，UV_Visdiffusereflectancespectroscopy(DRS)andphotoelectricperformancetestdemonstratesBiwassuccessfullydopedintoTiO2photocatalystanditexistedintheformofBi203．ComparedtopureTiO2photocatalyst，lightresponsewavelengthofBi203dopedTiO2photocatalysthasbeenextendedandithasobviousphotoelectricresponseinvisibleregion．Thedualslant-placedelectrodesthin-filmreactorwasassembled，usingthepreparedBi203一TiO2／TiasphotoanodeandCuascathode，andsuccessfullyusedtophotocatalytic(PC1treatReactiveBrilliantRedX-3B(RBR)undervisiblelightirradiation．ThemaininfluencefactorsofthePCreactionwereinvestigated．Thedecolourizationeficiencyof20mg／LRBRreached88％forl50mintreatmentundertheconditionsofinitialpH2．52andcirculatingflux80mL／min．Thepreliminarymechanismofthedualelectrodesthin-filmPCwasinvestigated．TheresultsdemonstratethephotogeneratedelectronsCanbespontaneouslytransferedfromthesurfaceoftheBi