Ag@ZnFe_(2-x)Ce_(x)O_(4)复合材料的制备及其光催化活性

Preparation of Ag@ZnFe_(2-x)Ce_(x)O_(4) composite and its photocatalytic activity

随着纳米技术的迅速发展,铁氧体掺杂的纳米复合材料成为人们关注和研究的热点之一。采用水热合成法制备了ZnFe_(2)O_(4)光催化剂,通过负载贵金属Ag和稀土元素Ce^(3+)掺杂的方式,尝试增加其光催化性能。通过X射线衍射、紫外-可见漫反射光谱等手段对合成材料的结构、光吸收等物理化学性质进行表征,在模拟光源照射条件下考察光催化剂对盐酸四环素溶液的降解性能。结果显示,负载Ag和掺杂Ce^(3+)后光催化剂的降解活性优于单纯的ZnFe_(2)O_(4)。考察不同H_(2)O_(2)投加量对光催化性质的影响,发现加入0.2 mL H_(2)O_(2)时光催化效率较高。在所制备的样品中,当Ag负载量为1%,Ce^(3+)掺杂量为2%时,材料的光催化活性明显优于单纯的ZnFe_(2)O_(4)。该工作对研制高活性光催化剂有一定的借鉴意义。

With the rapid development of nanotechnology,ferrite doped nanocomposites have become one of the hotspots of attention and research.ZnFe_(2)O_(4) photocatalyst was prepared by hydrothermal synthesis.Its photocatalytic performance was tried to be improved by loading noble metal Ag and rare earth element Ce^(3+) doping.The structure,light absorption and other physicochemical properties of the synthetic materials were characterized by XRD and UV-vis diffuse reflectance spectroscopy.The degradation performance of the photocatalyst for tetracycline hydrochloride solution was investigated under the irradiation of simulated light source.The results show that the degradation activity of the photocatalyst loaded with Ag and doped with Ce^(3+) is better than that of ZnFe_(2)O_(4).The effects of different H_(2)O_(2) dosage on photocatalytic properties were investigated.It was found that the photocatalytic effect is higher when 0.2 mL H_(2)O_(2) is added.As for the prepared samples,when Ag loading is 1%,Ce^(3+) doping is 2%,the photocatalytic activity of the material is higher than that of ZnFe_(2)O_(4).This work has certain reference significance for the development of high activity photocatalysts.