Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (6): 959-968.DOI: 10.1016/S1872-2067(19)63355-3

• Articles • Previous Articles    

CdS-modified one-dimensional g-C3N4 porous nanotubes for efficient visible-light photocatalytic conversion

Ben Chonga, Lei Chena, Dezhi Hanb, Liang Wanga, Lijuan Fenga, Qin Lic, Chunhu Lia, Wentai Wanga   

  1. a Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong, China;
    b College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, China;
    c Queensland Micro- and Nanotechnology Centre, Griffith University Nathan Campus, Brisbane, QLD 4111, Australia
  • Received:2018-12-19 Revised:2019-03-12 Online:2019-06-18 Published:2019-04-26
  • Contact: S1872-2067(19)63355-3
  • Supported by:

    The authors acknowledge the financial support from the National Natural Science Foundation of China (51602297 and U1510109), Major Research Project of Shandong Province (2016ZDJS11A04), Fundamental Research Funds for the Central Universities (201612007), Postdoctoral Innovation Program of Shandong Province (201603043), Australia Research Council (ARC) under the Project DP160104089, and Start-up Foundation for Advanced Talents of Qingdao University of Science and Technology (010022919).

Abstract:

A heterojunction photocatalyst based on porous tubular g-C3N4 decorated with CdS nanoparticles was fabricated by a facile hydrothermal co-deposition method. The one-dimensional porous structure of g-C3N4 provides a higher specific surface area, enhanced light absorption, and better separation and transport performance of charge carriers along the longitudinal direction, all of which synergistically contribute to the superior photocatalytic activity observed. The significantly enhanced catalytic efficiency is also a benefit originating from the fast transfer of photogenerated electrons and holes between g-C3N4 and CdS through a built-in electric field, which was confirmed by investigating the morphology, structure, optical properties, electrochemical properties, and photocatalytic activities. Photocatalytic degradation of rhodamine B (RhB) and photocatalytic hydrogen evolution reaction were also carried out to investigate its photocatalytic performance. RhB can be degraded completely within 60 min, and the optimum H2 evolution rate of tubular g-C3N4/CdS composite is as high as 71.6 μmol h-1, which is about 16.3 times higher than that of pure bulk g-C3N4. The as-prepared nanostructure would be suitable for treating environmental pollutants as well as for water splitting.

Key words: Tubular g-C3N4, CdS, Visible-light photocatalyst, Hydrogen evolution, Photocatalytic dye degradation