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Construction of direct solid-state Z-scheme g-C3N4/BiOI with improved photocatalytic activity for microcystin-LR degradation

Published online by Cambridge University Press:  21 November 2017

Fan Zhang ,
Liping Wang ,
Mei Xiao ,
Fei Liu ,
Xia Xu  and
Erdeng Du
Fan Zhang
Affiliation:
School of Environmental and Safety Engineering, Changzhou University, 213164 Changzhou, People’s Republic of China
Liping Wang*
Affiliation:
School of Environmental and Safety Engineering, Changzhou University, 213164 Changzhou, People’s Republic of China
Mei Xiao
Affiliation:
School of Environmental and Safety Engineering, Changzhou University, 213164 Changzhou, People’s Republic of China
Fei Liu
Affiliation:
School of Environmental and Safety Engineering, Changzhou University, 213164 Changzhou, People’s Republic of China
Xia Xu
Affiliation:
School of Environmental and Safety Engineering, Changzhou University, 213164 Changzhou, People’s Republic of China
Erdeng Du*
Affiliation:
School of Environmental and Safety Engineering, Changzhou University, 213164 Changzhou, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: wlp@cczu.edu.cn
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Abstract

The novel visible-light-responsive direct solid-state Z-scheme g-C3N4/BiOI heterojunction has been synthesized successfully by means of a solid phase calcination method and used for the degradation of microcystin-LR (MC-LR). The layered g-C3N4 disperses on the surface of BiOI microspheres. The samples are characterized by FESEM, HRTEM, XRD, FT-IR, UV-vis spectroscopy, XPS, BET, PL, and Mott–Sckottky. The photocatalytic activity and photodegradation mechanism of the as-prepared g-C3N4/BiOI microsphere photocatalysts are conducted under visible light irradiation using MC-LR as the target pollutant. The g-C3N4/BiOI material exhibits superior photocatalytic performance when compared with pure BiOI, the possible reason is the efficient separation of photogenerated carriers at the interface between g-C3N4 and BiOI. The heterostructure is responsible for the improved separation efficiency of photogenerated electron–hole pairs and thus the higher photocatalytic activity. The possible photocatalytic mechanism is proposed based on relative band positions of these two semiconductors.

Keywords

g-C3N4BiOIheterojunctionmicrocystin-LRphotocatalysisZ-scheme

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Type
Articles
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Journal of Materials Research , Volume 33 , Issue 2 , 29 January 2018 , pp. 201 - 212
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Xiaobo Chen

References

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