Fabrication of GO/magnetic graphitic nanocapsule/TiO_2 assemblies as efficient and recyclable photocatalysts  

作　　者：Zhenqian Cheng Ding Ding Xiangkun Nie Yiting Xu Zhiling Song Ting Fu Zhuo Chen Weihong Tan 

机构地区：[1]Molecular Science and Biomedicine Laboratory [2]State Key Laboratory of Chemo/Bio-Sensing and Chemometrics,Hunan University [3]College of Biology,Hunan University [4]College of Chemistry and Chemical Engineering,Hunan University

出　　处：《Science China Chemistry》2015年第7期1131-1136,共6页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2013CB932702);the Research Fund for the Program on National Key Scientific Instruments and Equipment Development(2011YQ0301241402);the National Natural Science Foundation of China(21105025);the Hunan Innovation and Entrepreneurship Program

摘　　要：In this work, we fabricate an efficient and stable photocatalyst system which has superior recyclability even under concentrated acidic conditions. The photocatalyst is prepared by assembling magnetic graphitic nanocapsules, titania(Ti O2) and graphene oxide(GO) into a complex system through π-π stacking and electrostatic interactions. Such catalytic complex demonstrates very high stability. Even after dispersal into a concentrated acidic solution for one month, this photocatalyst could still be recycled and maintain its catalytic activity. With methyl orange as the model molecule, the photocatalyst is demonstrated to rapidly decompose the molecules with very high photocatalytic activity under both concentrated acidic and neutral condition. Moreover, this photocatalyst retains approximately 100 wt% of its original photocatalytic activity even after multiple experimental runs, of magnetic recycling. Finally, using different samples from natural water sources and different dyes, this GO/ magnetic graphitic nanocapsule/Ti O2 system also demonstrates its high efficiency and recyclability for practical application.In this work, we fabricate an efficient and stable photocatalyst system which has superior recyclability even under concentrated acidic conditions. The photocatalyst is prepared by assembling magnetic graphitic nanocapsules, titania （TiO2） and graphene oxide （GO） into a complex system through π-π stacking and electrostatic interactions. Such catalytic complex demonstrates very high stability. Even after dispersal into a concentrated acidic solution for one month, this photocatalyst could still be re- cycled and maintain its catalytic activity. With methyl orange as the model molecule, the photocatalyst is demonstrated to rapidly decompose the molecules with very high photocatalytic activity under both concentrated acidic and neutral condition. Moreover, this photocatalyst retains approximately 100 wt% of its original photocatalytic activity even after multiple experi- mental runs, of magnetic recycling. Finally, using different samples from natural water sources and different dyes, this GO/ magnetic graphitic nanocapsule/TiO2 system also demonstrates its high efficiency and recyclability for practical application.

关 键 词：magnetic graphitic nanocapsule graphene oxide TiO2 photocatalyst RECYCLABILITY 

分 类 号：O613.71[理学—无机化学] O643.36[理学—化学]