2D/3D S-scheme heterojunction of carbon nitride/iodine-deficient bismuth oxyiodide for photocatalytic hydrogen production and bisphenol A degradation

Feihu Mu; Benlin Dai; Yahui Wu; Gang Yang; Shijie Li; Lili Zhang; Jiming Xu; Yazi Liu; Wei Zhao

doi:10.1016/j.jcis.2021.12.196

2D/3D S-scheme heterojunction of carbon nitride/iodine-deficient bismuth oxyiodide for photocatalytic hydrogen production and bisphenol A degradation

J Colloid Interface Sci. 2022 Apr 15:612:722-736. doi: 10.1016/j.jcis.2021.12.196. Epub 2022 Jan 6.

Authors

Feihu Mu¹, Benlin Dai¹, Yahui Wu², Gang Yang³, Shijie Li⁴, Lili Zhang¹, Jiming Xu⁵, Yazi Liu⁶, Wei Zhao⁷

Affiliations

¹ Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huaian, China.
² Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
³ School of Materials Engineering, Changshu Institute of Technology, Changshu, China.
⁴ Institute of Innovation & Application, Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan, China.
⁵ Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huaian, China. Electronic address: xujiming@hytc.edu.cn.
⁶ Jiangsu Engineering Lab of Water and Soil Eco-Remediation, School of Environment, Nanjing Normal University, Nanjing, China. Electronic address: yazi.liu@njnu.edu.cn.
⁷ School of Materials Engineering, Changshu Institute of Technology, Changshu, China; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China. Electronic address: lmjzhaowei@foxmail.com.

PMID: 35032927
DOI: 10.1016/j.jcis.2021.12.196

Abstract

A novel 2D/3D S-scheme carbon nitride/iodine-deficient bismuth oxyiodide (g-C₃N₄/BiO_1.2I_0.6) heterojunction was constructed for the first time by calcining a mixture of g-C₃N₄ nanosheets and flower-like BiOI. Irradiated by visible light, this g-C₃N₄/BiO_1.2I_0.6 heterojunction exhibited excellent photocatalytic hydrogen production and BPA degradation activity with high cycle stability. In particular, the photocatalytic activity of 0.2-C₃N₄/BiO_1.2I_0.6 could reach 1402.7 μmol g^-1 h^-1 (hydrogen production rate) and 0.01155 min^-1 (apparent rate of bisphenol A degradation), which were 3.5 and 3.2 times that of g-C₃N₄ respectively. The remarkable photocatalytic performance was due to the efficient charge separation of g-C₃N₄/BiO_1.2I_0.6 and the formation of S-scheme heterojunction, which maintained strong photocatalytic reduction and oxidation potentials. Noticeably, the charge density difference and band offsets of the g-C₃N₄/BiO_1.2I_0.6 were calculated. The results revealed that a built-in electric field (IEF) was created. The values of the valence band offset (ΔE_VBO) and the conduction band offset (ΔE_CBO) were -0.84 and -1.27 eV, respectively, which further demonstrated the formation of S-scheme photocatalytic charge transfer mechanism.

Keywords: Heterojunction; Photocatalysis; S-scheme; Visible light; g-C(3)N(4).