Construction of S-scheme Bi2WO6/g-C3N4 heterostructure nanosheets with enhanced visible-light photocatalytic degradation for ammonium dinitramide

Xiaoyan Lian; Wenhua Xue; Shuai Dong; Enzhou Liu; Hui Li; Kangzhen Xu

doi:10.1016/j.jhazmat.2021.125217

Construction of S-scheme Bi₂WO₆/g-C₃N₄ heterostructure nanosheets with enhanced visible-light photocatalytic degradation for ammonium dinitramide

J Hazard Mater. 2021 Jun 15:412:125217. doi: 10.1016/j.jhazmat.2021.125217. Epub 2021 Jan 23.

Authors

Xiaoyan Lian¹, Wenhua Xue², Shuai Dong², Enzhou Liu², Hui Li³, Kangzhen Xu⁴

Affiliations

¹ School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an 710069, China; College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China.
² School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an 710069, China.
³ Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
⁴ School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an 710069, China. Electronic address: xukz@nwu.edu.cn.

PMID: 33517062
DOI: 10.1016/j.jhazmat.2021.125217

Abstract

Photocatalysis technology is considered as a promising environmental remediation strategy. Herein, photocatalytic degradation of ammonium dinitramide (ADN, main component of propellant) was investigated over Bi₂WO₆/g-C₃N₄ (BWO/CN) heterostructure nanosheets prepared by a one-step in-situ hydrothermal method. The operating conditions including ADN initial concentration, catalyst dosage, initial pH, temperature and green oxidizer (hydrogen peroxide) were optimized systematically. Under optimal conditions, the photocatalytic degradation rate of ADN over BWO/CN can reach 98.93% after 80 min visible-light irradiation. Besides, the composite has excellent stability for ADN treatment and nitrate ions are the major degradation products. Furthermore, S-scheme heterojunction mechanism was proposed to explain the extremely high REDOX performance of BWO/CN composite.

Keywords: Ammonium dinitramide; Bi(2)WO(6); G-C(3)N(4); Photocatalysis; S-scheme.