J. Mater. Sci. Technol. ›› 2023, Vol. 164: 188-197.DOI: 10.1016/j.jmst.2023.03.066

• Research Article • Previous Articles     Next Articles

C-doped BiOCl/Bi2S3 heterojunction for highly efficient photoelectrochemical detection and photocatalytic reduction of Cr(VI)

Chunli Wanga,b, Nazhen Liub,*, Xia Zhaob, Yong Tianc, Xuwei Chena, Yanfeng Zhangd, Liang Fanb,*, Baorong Houb   

  1. aResearch Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China
    bKey Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
    cSchool of Environmental & Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
    dIntelligent Policing Key Laboratory of Sichuan Province, Sichuan Police College, Luzhou 646000, China
  • Received:2022-12-05 Revised:2023-03-03 Accepted:2023-03-16 Published:2023-11-20 Online:2023-11-15
  • Contact: *E-mail addresses: liunazhen@qdio.ac.cn (N. Liu), fanl@qdio.ac.cn (L. Fan).

Abstract: Novel C-BiOCl/Bi2S3 composites are prepared by hydrothermal C doping in BiOCl and in-situ growth of Bi2S3 on C-BiOCl. Compared with BiOCl, C-BiOCl has a larger exposed surface area and can effectively absorb visible light. The construction of a heterojunction in C-BiOCl/Bi2S3 further promotes the separation and transfer of photogenerated carriers. With improved photoelectric properties, the optimized 5C-BiOCl/5Bi2S3 is applied as a dual-functional composite for photoelectrochemical (PEC) detection and photocatalytic (PC) reduction of Cr(VI). The 5C-BiOCl/5Bi2S3 shows a linear range of 0.02-80 μM for PEC cathodic detection of Cr(VI) with a detection limit of 0.01628 μM. Additionally, 99.5% of Cr(VI) can be removed via absorption and PC reduction by 5C-BiOCl/5Bi2S3, with the reduction rate constant (k) 336 times higher than that of BiOCl.

Key words: C-BiOCl/Bi2S3, Dual-functional, Photoelectrochemical detection, Photocatalytic reduction, Cr(VI)