Controllable preparation of ZnO porous flower through a membrane dispersion reactor and their photocatalytic properties  

作　　者：Feng Zhang Zhilong Xu Kun Wang Rizhi Chen Zhaoxiang Zhong Weihong Xing 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, Nanjing Tech University [2]Changzhou Lvxin Advanced Material Technology Co., Ltd.

出　　处：《Chinese Journal of Chemical Engineering》2018年第10期2192-2198,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(21125629,21306079,21276124);Innovative Research Team Program by the Ministry of Education of China(IRT13070);China Postdoctoral Science Foundation(2014M561640);Jiangsu Planned Projects for Postdoctoral Research Funds(1401082B);Jiangsu province scientific supporting project(No.BE2014717);the Natural Science Foundation of Jiangsu Province(BK20150277)

摘　　要：Three dimensional (3D) flower-like basic zinc carbonate constructed by multilayered nanoplates were rapidly prepared at room temperature through the direct precipitation method coupled with membrane dispersion technology, and porous ZnO with similar structures could be obtained after calcining the precursor. The structural properties of the products before and after the calcining process were characterized by SEM, TEM and XRD.The supersaturation of the reaction system due to the membrane dispersion played an important role in the formation of uniform Zn_5(CO_3)_2(OH)_6 precursors. A plausible mechanism was proposed for the formation of the flower-like ZnO assembled by nanoplates composed of nanoparticles. The obtained ZnO microspheres showed excellent photocatalytic properties, which could be attributed to the open structure and remarkable amount of porous nanoplates.Three dimensional （3D） flower-like basic zinc carbonate constructed by multilayered nanoplates were rapidly prepared at room temperature through the direct precipitation method coupled with membrane dispersion technology, and porous ZnO with similar structures could be obtained after calcining the precursor. The structural properties of the products before and after the calcining process were characterized by SEM, TEM and XRD.The supersaturation of the reaction system due to the membrane dispersion played an important role in the formation of uniform Zn5（CO3）2（OH）6 precursors. A plausible mechanism was proposed for the formation of the flower-like ZnO assembled by nanoplates composed of nanoparticles. The obtained ZnO microspheres showed excellent photocatalytic properties, which could be attributed to the open structure and remarkable amount of porous nanoplates.

关 键 词：Three dimensional Porous ZnO FLOWER-LIKE Membrane dispersion Growth mechanism PHOTOCATALYTIC 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]