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g-C3N4 nanoparticle@porous g-C3N4 composite photocatalytic materials with significantly enhanced photo-generated carrier separation efficiency

Published online by Cambridge University Press:  20 July 2020

Qianhong Shen ,
Chengyan Wu ,
Zengyu You ,
Feilong Huang ,
Jiansong Sheng ,
Fang Zhang ,
Di Cheng  and
Hui Yang
Qianhong Shen*
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou310027, P.R. China Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou310058, P.R. China Research Institute of Zhejiang University-Taizhou, Taizhou318000, P.R. China
Chengyan Wu
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou310027, P.R. China
Zengyu You
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou310027, P.R. China
Feilong Huang
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou310027, P.R. China
Jiansong Sheng
Affiliation:
Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou310058, P.R. China Research Institute of Zhejiang University-Taizhou, Taizhou318000, P.R. China
Fang Zhang
Affiliation:
Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou310058, P.R. China Research Institute of Zhejiang University-Taizhou, Taizhou318000, P.R. China
Di Cheng
Affiliation:
Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou310058, P.R. China Research Institute of Zhejiang University-Taizhou, Taizhou318000, P.R. China
Hui Yang*
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou310027, P.R. China Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou310058, P.R. China Research Institute of Zhejiang University-Taizhou, Taizhou318000, P.R. China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

A novel g-C3N4 nanoparticle@porous g-C3N4 (CNNP@PCN) composite has been successfully fabricated by loading g-C3N4 nanoparticles on the porous g-C3N4 matrix via a simply electrostatic self-assembly method. The composition, morphological structure, optical property, and photocatalytic performance of the composite were evaluated by various measurements, including XRD, SEM, TEM, Zeta potential, DRS, PL, FTIR, and XPS. The results prove that the nanolization of g-C3N4 leads to an apparent blueshift of the absorption edge, and the energy band gap is increased from 2.84 eV of porous g-C3N4 to 3.40 eV of g-C3N4 nanoparticle (Fig. 6). Moreover, the valence band position of the g-C3N4 nanoparticle is about 0.7 eV lower than that of porous g-C3N4. Therefore, the photo-generated holes and electrons in porous g-C3N4 can transfer to the conduction band of g-C3N4 nanoparticle, thereby obtaining higher separation efficiency of photo-generated carriers as well as longer carrier lifetime. Under visible-light irradiation, 6CNNP@PCN exhibits the highest photocatalytic performance (Fig. 8) on MB, which is approximately 3.4 times as that of bulk g-C3N4.

Keywords

nanostructureinterfacephotochemical
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 16 , 28 August 2020 , pp. 2148 - 2157
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Copyright © Materials Research Society 2020

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