Journal
RSC ADVANCES
Volume 11, Issue 8, Pages 4810-4817Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra10694a
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Funding
- National Natural Science Foundation of China [11475080]
- Natural Science Foundation of Hunan Province [2019JJ50127]
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The Z-scheme g-C3N4/TiO2 catalysts were successfully synthesized through a thermal synthetic approach, showing excellent photocatalytic activity for U(vi) reduction under UV light irradiation. The photocatalytic tests demonstrated that g-C3N4/TiO2 exhibited significantly higher activity compared to the raw materials TiO2(P25) and g-C3N4, with 1.64 and 56.97 times enhancement, respectively.
Photocatalytic technology is a valid solution for the remediation of wastewater containing uranium. In this study, the synthesis of Z-scheme g-C3N4/TiO2 catalysts was made by a thermal synthetic approach for photocatalytic U(vi) reduction. The characterization results revealed the successful synthesis of g-C3N4/TiO2 nanostructures. The g-C3N4 surface was uniformly coated with TiO2 nanoparticles. The depletion of U(vi) in water evaluated the photocatalytic activity of g-C3N4/TiO2 under UV light irradiation. The photocatalytic tests showed that g-C3N4/TiO2 exhibited more effective photocatalytic activity than the raw materials (1.64 and 56.97 times higher than TiO2(P25) and g-C3N4, respectively). Besides, a pseudo-first-order model was followed by the experimental kinetic data for the photocatalytic process. Moreover, g-C3N4/TiO2 still presented high photocatalytic activity after four reacting cycles. Based on these experiment results, the improved photocatalytic activity could be attributed to the Z-scheme mechanism, which decreased the recombination of photo-produced electrons and holes. The synthesis of these g-C3N4/TiO2 nanomaterials provides a facile and inexpensive method for treating wastewater containing U(vi).
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