磁性Ag_3PO_4/CuO/CuFe_2O_4纳米复合材料光催化降解亚甲基蓝

Photodegradation of Methylene Blue by Magnetic Ag_3PO_4/CuO/CuFe_2O_4 Nanocomposite

通过简易水热法结合沉积法制备了磁性Ag_3PO_4/CuO/CuFe_2O_4纳米复合材料。采用XRD、EDS、FESEM及UV-vis DRS对制备样品进行表征。对磁性纳米复合材料在可见光照射下降解染料亚甲基蓝(MB)的性能进行了研究。光照90 min后,磁性Ag_3PO_4/CuO/CuFe_2O_4纳米复合材料对MB的降解率高达89%,高于CuO/CuFe_2O_4及Ag_3PO_4对MB的去除。捕获实验证实在Ag_3PO_4/CuO/CuFe_2O_4光催化系统中超氧自由基和空穴是导致MB降解的主要活性物种。利用外加磁场可将催化剂回收再利用,经过三次循环降解后,磁性复合材料对MB的去除率仍可达到85%。

The magnetic Ag3PO4/CuO/CuFe2O4 nanocomposite material was successfully fabricated by a two-step approach including a facile hydrothermal method and a deposition strategy.The assynthesized samples were characterized by XRD, EDS, FESEM and UV-vis DRS.The photocatalytic properties of the as-obtained magnetic nanocomposite were investigated by the degradaion of methylene blue（MB） dye under visible light irradiation, and the results showed that the degradation efficiency of the Ag3PO4/CuO/CuFe2O4 was about 89 % in 90 min, which was higher than those of pure CuO/CuFe2O4 and Ag3PO4.The free radical trapping experiments confirmed that the superoxide free radicals（O2·^-） and caves（h^＋） were the most active species for the decomposition of MB in the Ag3PO4/CuO/CuFe2O4 photocatalytic system.The photocatalyst could be collected by an external magnetic field and reused.After three repeated runs, the degradation efficiency of the as-prepared nanocomposite still got to 85 % for MB degradation.