Facile ultrasonic-assisted synthesis of micro–nanosheet structure Bi_4Ti_3O_(12)/g-C_3N_4 composites with enhanced photocatalytic activity on organic pollutants  

作　　者：Huihui Gan Futao Yi Huining Zhang Yongxing Qian Huixia Jin Kefeng Zhang 

机构地区：[1]School of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University [2]College of Environmental Science and Engineering, Guilin University of Technology

出　　处：《Chinese Journal of Chemical Engineering》2018年第12期2628-2635,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(51509220);the Natural Science Foundation of Zhejiang Province(LQ14E090003);Ningbo Science and Technology Plan Projects(2014C50007,2014C51003);Ningbo major social development projects(2017C510006)

摘　　要：The Bi_4Ti_3O_(12)/g-C_3N_4 composites with microsheet and nanosheet structure were prepared through facile ultrasonic-assisted method. The SEM and TEM results suggested that the nanosheets g-C_3N_4 were stacked on the surface of regular Bi_4Ti_3O_(12) sheets. Comparing with pure Bi_4Ti_3O_(12) and g-C_3N_4, the Bi_4Ti_3O_(12)/g-C_3N_4 composites showed significant enhancement in photocatalytic efficiency for the degradation of RhB in solution. With the mass ratio of g-C_3N_4 increasing to 10 wt%, the Bi_4Ti_3O_(12)/g-C_3N_4-10% presented the best photocatalytic activity. Its photocatalysis reaction constant was approximately 2 times higher than the single component Bi_4Ti_3O_(12) or g-C_3N_4. Meanwhile, good stability and durability for the Bi_4Ti_3O_(12)/g-C_3N_4-10% were confirmed by the recycling experiment and FT-IR analysis. The possible mechanism for the improvements was the matched band positions and the effective separation of photo-excited electrons(e-) and holes(h+). Furthermore, based on the results of active species trapping, photo-generated holes(h+) and superoxide radical(·O2-) could be the main radicals in reaction.The Bi_4Ti_3O_(12)/g-C_3N_4 composites with microsheet and nanosheet structure were prepared through facile ultrasonic-assisted method. The SEM and TEM results suggested that the nanosheets g-C_3N_4 were stacked on the surface of regular Bi_4Ti_3O_(12) sheets. Comparing with pure Bi_4Ti_3O_(12) and g-C_3N_4, the Bi_4Ti_3O_(12)/g-C_3N_4 composites showed significant enhancement in photocatalytic efficiency for the degradation of RhB in solution. With the mass ratio of g-C_3N_4 increasing to 10 wt%, the Bi_4Ti_3O_(12)/g-C_3N_4-10% presented the best photocatalytic activity. Its photocatalysis reaction constant was approximately 2 times higher than the single component Bi_4Ti_3O_(12) or g-C_3N_4. Meanwhile, good stability and durability for the Bi_4Ti_3O_(12)/g-C_3N_4-10% were confirmed by the recycling experiment and FT-IR analysis. The possible mechanism for the improvements was the matched band positions and the effective separation of photo-excited electrons(e-) and holes(h+). Furthermore, based on the results of active species trapping, photo-generated holes(h+) and superoxide radical(·O2-) could be the main radicals in reaction.

关 键 词：RHODAMINE B Photocatalyst Ultrasonic assisted synthesis BI4TI3O12 g-C3N4 

分 类 号：TQ[化学工程]