活性炭硬模板溶胶–凝胶法制备泡沫镍负载多孔TiO2薄膜电极及其光电催化性能详解.docVIP

活性炭硬模板溶胶–凝胶法制备泡沫镍负载多孔TiO2薄膜电极及其光电催化性能 曾孟雄，李佑稷，刘晨，李雷勇，陈伟 （吉首大学化学化工学院，湖南，中国 46000） 摘要: 以泡沫镍为载体，活性炭为硬模板，采用溶胶–凝胶法制备泡沫镍负载多孔TiO2薄膜( porous TiO2 films /foam niclel, PTFN)，利用XRD和SEM等测试手段对其结构进行表征，通过亚甲基蓝溶液的光电催化降解反应，对其光电催化活性进行评价，并探讨阳极偏压、通气速率、亚甲基蓝初始溶液浓度对降解效率的影响规律。结果表明：相对于未加模板的TiO2薄膜电极的光电催化性能，泡沫镍负载多孔TiO2薄膜具有更好的光电催化性能，原因是高比表面积电极有利于为光电催化提供高浓度的亚甲基蓝分子，使反应速率加快；另外，存在最佳的光电催化降解条件，即当外加阳极偏压为3V、通气速率为40L/h时，催化降解效率最高。同时发现亚甲基蓝在光电催化降解过程中，通过自由基的氧化发生了C=N键的断裂去甲基化，最后被降解为H2O和CO2。 关键字：泡沫镍；多孔TiO2薄膜；光电催化；亚甲基蓝降解 Photoelectrocatalytic activities of porous TiO2 films coated on foam nickel substrates prpared by sol-gel method with activated carbon as hard template Zeng Mengxiong，Li Youji，Li Leiyong，Liu Chen，Chen Wei （Jishou University, of Chemistry and Chemical Engineering, Hunan, China 416000） Abstract：The porous TiO2 films coated foam nickel (PTFN) is successfully prepared on foam nickel substrates by sol-gel method using activated carbon as hard template. The PTFN was characteristized by x-ray diffraction (XRD), scanning electronic mico(SEM), etc and its photoelectrocatalytic activity was evulated degradation of methylene blue solution. Meanwhile, the effects of anode bias voltage, ventilation rate and initial concentration of methylene blue on photoelectrocatalytic performance were investigated. The results showed that the PTFN shows higher photoelectrocatalytic activity for the degradation of methylene blue in non-porous TiO2 films coated foam nickel substrates, because electrode with high surface area is available of providing high concentration of MB to be degraded and resulting in acceleration of reaction?rate. Additionally, there exits a best photoelectrocatalytic degradation conditions. Under the conditions of 3 V voltage and 40L/h ventilation rate, the photoelectrocatalytic degradation efficiency for methylene blue is the highest. Meanwhile, it is also found that methylene blue molecuars are oxidated by free radicals in the process of photoelectrocatalytic degradation and occurred in the C = N