• 关键词：溶胶-凝胶法  正交试验  Fe,N共掺杂膜电极  双极液膜反应器  可见光

• 基金项目：国家自然科学基金青年项目（No.21206203）

• 周若宇
• 重庆理工大学化学化工学院, 重庆 400054

• 钟登杰
• 重庆理工大学化学化工学院, 重庆 400054

• 徐云兰
• 重庆理工大学化学化工学院, 重庆 400054

• 胡学步
• 重庆理工大学化学化工学院, 重庆 400054

• 贾金平
• 上海交通大学环境科学与工程学院, 上海 200240

• 摘要：采用溶胶-凝胶法制备了Fe、N共掺杂TiO₂膜电极（Fe，N-TiO₂/Ti），并设计三因素五水平正交试验对电极制备条件进行优化.结果表明，各因素影响主次顺序为：煅烧温度 > Fe掺杂量 > N掺杂量；最优制备条件为：煅烧温度550℃，Fe 掺杂量0.3%（质量分数），N 掺杂量0.3%（质量分数）；共掺杂电极光催化活性优于单掺杂和未掺杂电极.紫外-可见漫反射和光电性能测试表明，催化剂有可见光响应；XRD表征结果表明，Fe、N共掺杂细化了晶粒，有效抑制了金红石相的形成，其晶型为锐钛矿型，粒径为11.48 nm.利用Fe，N-TiO₂/Ti与Cu阴极组装成斜置双极液膜反应器，可见光激发光催化降解苋菜红，考察了主要影响因素.结果发现，最佳条件为：初始pH 2.50，废水流量5.1 L·h^-1，在此条件下处理20 mg·L^-1苋菜红80 min，脱色率达到91.6%.电极重复使用10次，每次60 min，脱色率下降了12.99%，说明电极稳定性较好.

• Abstract：Fe, N co-doped TiO₂/Ti electrode (Fe, N-TiO₂/Ti)was prepared by sol-gel method and orthogonal tests L₂₅(5³) were designed to optimize the preparation conditions.The results show that the influence on Fe, N co-doped TiO₂/Ti follows the sequence: calcination temperature, doping concentrations of Fe and doping concentrations of N.Compared with single-doped membrane electrode (Fe-TiO₂/Ti, N-TiO₂/Ti) and pure TiO₂/Ti, Fe, N-TiO₂/Ti displayed higher photocatalytic activity under the optimum conditions: 550℃ for calcination temperature, Fe 0.3% and N 0.3%.the performance of optimized photoelectrode under visible light were tested by using UV-vis diffuse reflectance spectroscopy (DRS).The morphology structure was characterized by using X-ray diffraction (XRD), indicating that codoping Fe,N refined the grain TiO₂/Ti photocatalyst with particle diameter of 11.48 nm and inhibited its crystal transformation from anatase to rutile.Finally, the obtained Fe, N-TiO₂/Ti was used as photoanode to assemble a dual slant-placed electrodes thin-film reactor with Cu cathode.Results of photocatalytic degradation of amaranth show that the decolorization efficiency of 20 mg·L^-1 amaranth reached 91.6% in 80 min under the optimal treatment conditions of initial pH 2.50, circulating flux 5.1 L·h^-1.In addition, good catalytic activity was remained after reusing co-doped photoelectrode for 10 times (each lasted 60 min) (only decreased 12.99% of decolorization efficiency), suggesting the good stability of the Fe, N-TiO₂/Ti photoelectrode

• Key words：sol-gel method  orthogonal test  Fe, N-TiO₂/Ti  dual slant-placed electrodes thin-film reactor  visible light

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