Synthesis of porous platinum-ion-doped titanium dioxide and the photocatalytic degradation of 4-chlorophenol under visible light irradiation
Synthesis of porous platinum-ion-doped titanium dioxide and the photocatalytic degradation of 4-chlorophenol under visible light irradiation
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DOI：
10.1016/j.apcatb.2012.03.026
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发表时间：
2012-06
影响因子：
22.1
通讯作者：
S. Yamazaki;Yuhei Fujiwara;Shinya Yabuno;Kenta Adachi;K. Honda
中科院分区：
文献类型：
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作者：
S. Yamazaki;Yuhei Fujiwara;Shinya Yabuno;Kenta Adachi;K. Honda
以水为溶剂，采用溶胶凝胶法进行渗析，制备了比表面积大于200m2g−1的多孔铂离子掺杂二氧化钛，在紫外光和可见光(VL)照射下对4-氯苯酚(4-CP)具有良好的光催化降解活性。在透析过程中，76.5%的ClTiO2被去除，并在铂-−中形成了中孔。孔径分布的测量表明，在200℃焙烧后，在约3 nm处出现一峰。在真空条件下制备铂-二氧化钛的最佳条件为：当铂的掺杂量为0.5at.%时，在200~500℃范围内焙烧温度为200℃。通过动力学研究，阐明了铂-二氧化钛的加入量、4-CP的初始浓度、入射光的强度和波长、pH和温度对反应速度的影响，得到了在真空发光条件下的反应规律。观察到中间体苯二酚和对苯二酚的形成。它们在铂-二氧化钛上被进一步光降解，在VL照射390min时，90.7%的4-CP完全矿化。
Porous platinum-ion-doped TiO2(Pt-TiO2) with BET surface area higher than 200m2g−1was prepared by using water as solvent and conducting dialysis in a sol–gel method and demonstrated to have superior photocatalytic activity for the photodegradation of 4-chlorophenol (4-CP) under both ultraviolet and visible light (VL) irradiation. During dialysis, 76.5% of Cl−was removed and mesopores were formed in Pt-TiO2. Measurements of pore-size distribution indicated a peak at ca. 3nm after the calcination of Pt-TiO2at 200°C. Optimal conditions to prepare Pt-TiO2acting under VL were 0.5at.% as the Pt-doping content and 200°C as the calcination temperature in the range of 200–500°C. Kinetic studies were performed to clarify the effect of the amount of Pt-TiO2, initial concentration of 4-CP, intensity and wavelength of the incident light, pH and temperature on the reaction rate and to obtain the rate law under VL irradiation. Formation of benzoquinone and hydroquinone as intermediates was observed. They were further photodegraded on Pt-TiO2and 90.7% of 4-CP was completely mineralized at the VL irradiation of 390min.