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采用一锅水热还原路径制备得到均匀单分散、具有分级结构的MoO2微球。用XRD、FESEM、TEM及紫外-可见吸收光谱对产品进行了表征。结果表明MoO2微球的尺寸大小为1.5~3.5μm,由微小的纳米片或纳米粒子组装而成。对比实验表明,一些反应参数如还原剂柠檬酸C6H8O7和矿化剂Na2CO3的用量极大地影响了MoO2微球的生长。基于MoO2微球生长时间演变的对比实验,提出了取向聚集-奥斯瓦尔德熟化生长机制。光催化评价结果表明,钨灯辐照时,在H2O2辅助下,MoO2微球对降解罗丹明B具有较高的催化活性。
A uniform monodispersed MoO2 microsphere with a hierarchical structure was prepared by a one-pot hydrothermal reduction path. The products were characterized by XRD, FESEM, TEM and UV-Vis absorption spectra. The results show that the size of MoO2 microspheres is 1.5 ~ 3.5μm, assembled from tiny nanosheets or nanoparticles. Comparative experiments show that some reaction parameters such as the reductant citric acid C6H8O7 and the amount of mineralizer Na2CO3 greatly affected the growth of MoO2 microspheres. Based on the comparative experiments on the growth of MoO2 microspheres, the orientation aggregation-Oswald ripening mechanism was proposed. The photocatalytic evaluation showed that MoO2 microspheres had high catalytic activity for the degradation of rhodamine B with the aid of H2O2 when irradiated by tungsten lamp.