Journal
CHINESE JOURNAL OF CHEMICAL ENGINEERING
Volume 26, Issue 12, Pages 2628-2635Publisher
CHEMICAL INDUSTRY PRESS
DOI: 10.1016/j.cjche.2018.02.017
Keywords
Rhodamine B; Photocatalyst; Ultrasonic assisted synthesis; Bi4Ti3O12; g-C3N4
Categories
Funding
- National Natural Science Foundation of China [51509220]
- Natural Science Foundation of Zhejiang Province [LQ14E090003]
- Ningbo Science and Technology Plan Projects [2014C50007, 2014C51003]
- Ningbo major social development projects [2017C510006]
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The Bi4Ti3O12/g-C3N4 composites with microsheet and nanosheet structure were prepared through facile ultrasonic-assisted method. The SEM and TEM results suggested that the nanosheets g-C3N4 were stacked on the surface of regular Bi4Ti3O12 sheets. Comparing with pure Bi4Ti3O12 and g-C3N4, the Bi4Ti3O12/g-C3N4 composites showed significant enhancement in photocatalytic efficiency for the degradation of RhB in solution. With the mass ratio of g-C3N4 increasing to 10 wt%, the Bi4Ti3O12/g-C3N4-10% presented the best photocatalytic activity. Its photocatalysis reaction constant was approximately 2 times higher than the single component Bi4Ti3O12 or g-C3N4. Meanwhile, good stability and durability for the Bi4Ti3O12/g-C3N4-10% 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 (center dot O-2(-)) could be the main radicals in reaction. (C) 2018 The Chemical Industry and Engineering Society of China. and Chemical Industry Press. All rights reserved.
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