Liao Yuanyuan, Li Yuan, Wang Lei, Zhao Yongxia, Ma Danyang, Wang Biqing, Wan Yongxia, Zhong Shengliang
College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
Dalton Trans. 2017 Jan 31;46(5):1634-1644. doi: 10.1039/c6dt04402f.
In this work, ceria multi-shelled nanospheres with a tunable shell number and thickness were prepared by a facile coordination polymer (CP) precursor method without the use of any template and surfactant. Interestingly, the number, thickness and structure of the shell can be tuned by varying the reaction time, reaction temperature, ratio of reagent and calcination temperature. The formation process of the multi-shelled hollow spheres was also investigated, which experienced a core contraction and shell separation process. Moreover, the multi-shelled CeO hollow nanospheres displayed excellent photocatalytic activity in the degradation of RhB. Au and AuPd nanoparticle loaded multi-shelled CeO nanocomposites were also prepared. Results show that Au/CeO multi-shelled hollow nanospheres showed eximious catalytic activity for the reduction of p-nitrophenol with a reaction rate constant k of 0.416 min. In addition, AuPd/CeO exhibited a remarkable catalytic activity for the conversion of CO. Employing this method, heavy rare earth oxide multi-shelled structures and light rare earth oxide solid spheres were obtained. This method may be employed for the preparation of other materials with complex structures.
在本工作中，通过简便的配位聚合物（CP）前驱体法制备了具有可调壳层数和厚度的二氧化铈多壳层纳米球，无需使用任何模板和表面活性剂。有趣的是，壳层的数量、厚度和结构可通过改变反应时间、反应温度、试剂比例和煅烧温度来调节。还研究了多壳层空心球的形成过程，其经历了核收缩和壳分离过程。此外，多壳层CeO空心纳米球在降解罗丹明B方面表现出优异的光催化活性。还制备了负载金和金钯纳米颗粒的多壳层CeO纳米复合材料。结果表明，Au/CeO多壳层空心纳米球对对硝基苯酚的还原表现出优异的催化活性，反应速率常数k为0.416 min⁻¹。此外，AuPd/CeO对CO的转化表现出显著的催化活性。采用该方法，获得了重稀土氧化物多壳层结构和轻稀土氧化物实心球。该方法可用于制备其他具有复杂结构的材料。
