PVA在提高TiO_2/CdSe异质结光催化活性与抗光腐蚀性能方面的应用及机理
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摘要
通过阳极氧化法和电化学沉积制备了TiO_2/CdSe异质结膜,并通过旋涂结合后续热处理的方法,在TiO_2/CdSe异质结膜上制备适量脱水态的聚乙烯醇(PVA)来提高TiO_2/CdSe异质结抗光腐蚀性能。采用XRD,SEM,FTIR,UV-Vis,PL,电化学测试,光催化降解罗丹明B等方法对样品的晶体结构、微观形貌、光电化学性能、光催化性能等进行了表征,并通过测定光降解体系中Cd2+的浓度,研究了纳米复合材料的抗光腐蚀性能。结果表明,与TiO_2/CdSe相比,TiO_2/CdSe/PVA纳米复合材料不仅具有更好的可见光光催化活性,还具有良好的可见光光催化稳定性和抗光腐蚀性能。同时,PVA的存在对光催化反应中的二次污染物Cd2+也有抑制作用。
TiO_2/CdSe heterojunction was synthesized by anodic oxidation method and electrochemical deposition method. Then dehydrated polyvinyl alcohol films were spin coated on TiO_2/CdSe films with the annealing process.The crystal structure, morphology, photoelectrochemical and photocatlytic properties of the samples were investigated by XRD, SEM, FTIR, UV-Vis, PL, electrochemical and rhodamine B(RhB) degradation test. The photocorrosion resistance of the nanocomposites were also evaluated by measuring the concentration of Cd2+produced in the Rh B degradation process. The results show that TiO_2/CdSe/PVA nanocomposites possess more excellent photocatalytic activity and good stability and photo-corrosion resistant properties compared to TiO_2/CdSe under visible light irradiation. Meanwhile, PVA can restrain Cd2+the secondary pollutants in photocatalytic reaction.
TiO_2/CdSe heterojunction was synthesized by anodic oxidation method and electrochemical deposition method. Then dehydrated polyvinyl alcohol films were spin coated on TiO_2/CdSe films with the annealing process.The crystal structure, morphology, photoelectrochemical and photocatlytic properties of the samples were investigated by XRD, SEM, FTIR, UV-Vis, PL, electrochemical and rhodamine B(RhB) degradation test. The photocorrosion resistance of the nanocomposites were also evaluated by measuring the concentration of Cd2+produced in the Rh B degradation process. The results show that TiO_2/CdSe/PVA nanocomposites possess more excellent photocatalytic activity and good stability and photo-corrosion resistant properties compared to TiO_2/CdSe under visible light irradiation. Meanwhile, PVA can restrain Cd2+the secondary pollutants in photocatalytic reaction.
引文
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