摘要
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。
Monodispersed and uniform hierarchical MoO2 microspheres were synthesized through a one-pot hydrothermal reduction route. The crystal structure and morphology of the as-prepared products were characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, transmission electron microscopy （TEM） and UV-Visible absorption spectroscopy. The results indicate that the MoO2 microspheres with the size of 1.5 to 3.5 μm are assembled by tiny nanoflakes or nanoparticles. Comparative experimental results reveal that the parameters of synthetic conditions, such as the amount of reducing agent citric acid （C6H8O7, CA） and mineralizer Na2CO3, greatly affect the growth of monodisperse MoO2 microspheres. The orientated aggregation combining with Ostwald ripening growth mechanism of the MoO2 microspheres was proposed, based on the evolution of the structure and the morphology with the extension of reaction time. Photocatalytic results indicate that the prepared MoO2 microspheres exhibit higher photocatalytic activity for the degradation of Rhodamine B （RhB） in the presence of H2O2 under tungsten lamp irradiation.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第2期398-404,共7页
Chinese Journal of Inorganic Chemistry
基金
安徽省第五批优秀青年科技基金滚动支持项目计划(No.1308085JGD06)
国家自然科学基金(No.20501002)资助项目
关键词
MoO2
微球
水热合成
晶体生长
光催化活性
MOO2
microspheres
hydrothermal synthesis
crystal growth
photocatalytic activity
