PW_(12)/g-C_3N_4光催化降解甲基橙

采用浸渍法制备了磷钨酸(PW12)/g-C3N4复合光催化剂,并将其用于溶液中甲基橙的光催化降解,运用IR技术对使用前后的光催化剂进行了表征。表征结果显示,PW12和g-C3N4的结构未在浸渍负载中发生改变,且PW12和g-C3N4结合牢固。实验结果表明:最佳的PW12负载量(光催化剂中PW12的质量分数)为50%;光催化降解甲基橙的优化反应条件为初始甲基橙质量浓度5 mg/L、光催化剂加入量0.6 g/L、初始溶液p H=7;在优化条件下,分别采用紫外光、模拟太阳光、可见光照射120 min后,甲基橙的降解率分别为96.59%,82.23%,42.78%;该光催化剂固载良好,使用中不易发生溶脱,稳定性好,可重复使用。

Photocatalytic Degradation of Methyl Orange with PW12/g-C3N4

The composite photocatalyst phosphotungstic acid （PW₁₂）/g-C₃N₄ was prepared by dipping method,and used for photocatalytic degradation of methyl orange in solution. The photocatalysts before and after using were characterized by IR. The characterized results indicate that PW₁₂ and g-C₃N₄ combine strongly with each other with no structure change during the dipping process. The experimental results show that：The optimum PW₁₂ loading is 50% （w）;Under the the optimized methyl orange degradation conditions of initial methyl orange mass concentration 5 mg/L,photocatalyst dosage 0.6 g/L and initial solution pH 7,the degradation rates of methyl orange are 96.59%,82.23% and 42.78% by irradiation under UV-light,simulated sunlight and visible light for 120 min respectively. The well supported and stable photocatalyst is not easily dissolved in reaction,so it can be used repeatedly.