J. Mater. Sci. Technol. ›› 2023, Vol. 152: 37-49.DOI: 10.1016/j.jmst.2023.01.006

• Research article • Previous Articles     Next Articles

Improved performance of visible-light photocatalytic H2-production and Cr(VI) reduction by waste pigeon guano doped g-C3N4nanosheets

Yangli Kea, Qingliang Youb, Jing Aic,*, Xiaofang Yangd, Qigao Shanga, Yanyang Liua, Dongsheng Wange, Guiying Liaoa,*   

  1. aFaculty of Materials Science and Chemistry, China University of Geosciences, Hubei 430074, China;
    bKey Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Optoelectronic Materials and Technology, Jianghan University, Wuhan 430056, China;
    cHubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;
    dState Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    eCollege of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
  • Received:2022-11-24 Revised:2023-01-12 Accepted:2023-01-12 Published:2023-07-20 Online:2023-02-16
  • Contact: *E-mail addresses: aij@cug.edu.cn (J. Ai), liaogy@cug.edu.cn (G. Liao).

Abstract: In this study, waste pigeon guano (PG) was re-utilized as an ideal biomass adulterant to improve the photocatalytic activity of the pristine graphitic carbon nitride (g-C3N4). Waste PG and melamine were employed as precursors to fabricate a novel porous multielement-doped g-C3N4 (CN-PG-S) nanosheets photocatalyst via in situ thermal polycondensation coupled with thermal exfoliation strategy. The CN-PG-S owned abundant uniformly porous structures, superior conductivity, and excellent photocatalytic abilities, resulting in highly-efficient H2-production (1950 μmol g-1 h-1) and Cr(VI) reduction (99.1%) under visible light, which increased by 22.9-folds and 5.3-folds more than that of pristine g-C3N4. The non-metallic (P, S, and O) and metallic elements in CN-PG-S played a crucial role in expanding the visible-light absorption range and promoting the separation-migration of photogenerated electron-hole pairs. And the uniformly porous nanosheet structure of CN-PG-S shortens the diffusion paths of photogenerated carriers and exposes more active sites for photocatalytic reactions. This study proposed an eco-friendly resources integration strategy of waste PG to prepare excellent CN-PG-S photocatalysts for highly-efficient H2-production and Cr(VI) reduction.

Key words: Pigeon guano (PG) doping, g-C3N4 nanosheets, Photocatalyst, H2-production, Cr(VI) reduction