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以离子液体1-庚基-3-甲基咪唑溴盐([C7mim]Br)为反应介质,采用水热法制备钆铈修饰纳米ZnO光催化剂。通过SEM、TEM、XRD、UV-Vis等手段对所制备的样品的形貌、物相和结构进行表征。结果表明,以离子液体[C7mim]Br为反应介质制备的ZnO与(Gd3+,Ce4+)-ZnO均属纤锌矿结构;钆铈修饰则有效抑制了ZnO晶粒的生长,使得光响应范围发生红移,且增强了ZnO的可见与紫外光区光吸收。以氙灯为光源,有机染料活性艳蓝为目标降解物,考察纳米ZnO及(Gd3+,Ce4+)-ZnO的光催化活性。光催化活性测试显示(Gd3+,Ce4+)-ZnO对活性艳蓝的去除率(92.36%)远高于ZnO(52.49%),Gd3+、Ce4+共修饰能够显著提高ZnO的可见光活性。
The gadolinium-cerium-modified nano-ZnO photocatalyst was prepared by hydrothermal method using ionic liquid 1-heptyl-3-methylimidazolium bromide ([C7mim] Br) as the reaction medium. The morphology, phase and structure of the prepared samples were characterized by SEM, TEM, XRD and UV-Vis. The results show that both ZnO and (Gd3 +, Ce4 +) - ZnO prepared with ionic liquid [C7mim] Br as the reaction medium are wurtzite structure; while the gadolinium-cerium modification effectively inhibits the growth of ZnO grains and the photoresponse range is red Shift, and enhance the ZnO visible and UV light absorption. The xenon lamp was used as the light source and the active dye blue of the organic dye was the target degradation product. The photocatalytic activities of nano-ZnO and (Gd3 +, Ce4 +) - ZnO were investigated. The results of photocatalytic activity showed that the removal rate of (Gd3 +, Ce4 +) - ZnO to reactive brilliant blue (92.36%) was much higher than that of ZnO (52.49%), and the covalent modification of Gd3 + and Ce4 + could significantly increase the visible light activity of ZnO.