Synthesis of g-C(3)N(4)/TiO(2) nanostructures for enhanced photocatalytic reduction of U(vi) in water

Photocatalytic technology is a valid solution for the remediation of wastewater containing uranium. In this study, the synthesis of Z-scheme g-C(3)N(4)/TiO(2) catalysts was made by a thermal synthetic approach for photocatalytic U(vi) reduction. The characterization results revealed the successful synthesis of g-C(3)N(4)/TiO(2) nanostructures. The g-C(3)N(4) surface was uniformly coated with TiO(2) nanoparticles. The depletion of U(vi) in water evaluated the photocatalytic activity of g-C(3)N(4)/TiO(2) under UV light irradiation. The photocatalytic tests showed that g-C(3)N(4)/TiO(2) exhibited more effective photocatalytic activity than the raw materials (1.64 and 56.97 times higher than TiO(2)(P25) and g-C(3)N(4), respectively). Besides, a pseudo-first-order model was followed by the experimental kinetic data for the photocatalytic process. Moreover, g-C(3)N(4)/TiO(2) 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-C(3)N(4)/TiO(2) nanomaterials provides a facile and inexpensive method for treating wastewater containing U(vi).