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Citation: Mingze AN, Bingbing ZHANG, Zhao YANG, Hao PU, Weijie CHEN, Bin XUE, Sheng WANG, Xiaoyan DING, Lulu SHI. Construction of an S-scheme g-C3N4/TiO2 heterostructure for tetracycline degradation and hydrogen production[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(4): 843-860. doi: 10.11862/CJIC.20250301 shu

Construction of an S-scheme g-C3N4/TiO2 heterostructure for tetracycline degradation and hydrogen production

  • 1.

    Guizhou Material Industrial Technology Institute, Guiyang 550022, China

  • 2.

    College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China

Figures(10)

  • To overcome the limitations of traditional photocatalysts, such as inefficient separation of charge carriers and poor visible-light absorption, S-scheme g-C3N4/TiO2 heterojunction photocatalysts were synthesized via a combined method of thermal polymerization, hydrothermal synthesis, and calcination. The crystal structures, morphological features, and optical properties of the composites were systematically characterized, and their photocatalytic performance was evaluated through tetracycline (TC) degradation and hydrogen evolution experiments. Trapping experiments and electron paramagnetic resonance (EPR) measurements were conducted to elucidate the reaction mechanisms. The results demonstrate that the S-scheme heterojunction effectively extends the visible-light absorption range and facilitates the efficient separation of photogenerated electron-hole pairs. Under optimal conditions, the composite achieved a TC degradation rate of 94.5% and a hydrogen evolution rate of 329.1 μmol·h-1·g-1 after 8 h of irradiation, both values being significantly higher than those of pristine g-C3N4 or TiO2. Moreover, the S-scheme g-C3N4/TiO2 heterojunction retained high photocatalytic activity over five consecutive cycles, confirming its excellent stability. Mechanistic investigations revealed that the S-scheme heterojunction maintained strong redox capacities, with superoxide radicals (·O2-), hydroxyl radicals (·OH), electrons (e-), and holes (h+) serving as the primary active species responsible for TC degradation and H2 production.
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