粉煤灰沸石负载Ce3+/TiO2光催化降解水中的菲和荧蒽

以钛酸四丁酯为前驱体，粉煤灰合成沸石为载体，采用溶胶-凝胶方法，在低温条件下制备了稀土铈掺杂的TiO₂光催化剂。利用SEM-EDS、XRD、FTIR对催化剂进行了分析和表征。以高压汞灯为灯源，对多环芳烃菲、荧蒽的降解进行了研究。实验考查了稀土铈掺杂质量分数、催化剂用量、溶液pH、目标物初始质量浓度等因素对光催化降解的影响，研究了其光降解动力学。结果表明，当稀土铈含量为0.5%，催化剂用量为3 g/L，pH偏碱性时，催化效果最佳。光催化反应符合Langmuir-Hinshelwood 动力学规律，菲、荧蒽的降解过程符合一级反应动力学，反应速率常数分别为0.0126 min^-1，0.0099 min^-1。

Photocatalytic degradation of phenanthrene and fluoranthene solution by Ce3+ modified TiO2 loaded on zeolite from coal ash

TiO₂ photocatalyst doped with Ce³⁺ was synthesized by sol-gel method at low temperature using tetrabutyl titanate as recursor and zeolite from coal ash as supporter. The obtained samples were analyzed and characterized by X-ray diffraction (XRD),scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and fourier transform infrared spectroscopy(FTIR). The degradation progress of phenanthrene and fluoranthene in aqueous was studied by using high pressure polyethylene mercury lamp as an illuminating source. Effects of Ce³⁺ doping content, photocatalyst dosage, solution pH and the initial concentration on the degradation rates were investigated. The results show that the degradation rate achieved maximum under the conditions of Ce³⁺ doping content of 0.5%, photocatalyst dosage of 3 g/L, and solution pH>7. The photocatalytic process of phenanthrene and fluoranthene were accorded with the rule of Langmuir-Hinshelwood kinetics, which followed the first-order reaction and the observed degradation rate constant k were 0.0126 min^-1,0.0099 min^-1, respectively.