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Influence of g-C 3 N 4 Precursors in g-C 3 N 4 /NiTiO 3 Composites on Photocatalytic Behavior and the Interconnection between g-C 3 N 4 and NiTiO 3 .
Langmuir : the ACS Journal of Surfaces and Colloids 2018 October 30
In this study, composite photocatalysts were produced from NiTiO3 and N2 -rich precursors (dicyandiamide, melamine, urea, and thiourea) under N2 flow conditions. The goal of the study was to investigate the interaction between NiTiO3 and the synthesized g-C3 N4 . The properties of the g-C3 N4 /NiTiO3 (CNT) composites were different depending on the starting materials. Dicyandiamide and thiourea created strong connections with NiTiO3 and resulted in the generation of Ti-N and Ti-O-S bonds. Urea and melamine, however, had difficulty forming g-C3 N4 structures or interconnections with NiTiO3 . The Ti-N and Ti-O-S bridges in the composite photocatalysts led to increased photocatalytic activity as well as inhibition of the recombination rate. Additionally, the band diagrams of g-C3 N4 prepared from dicyandiamide and thiourea exhibited positions suitable for the Z-scheme charge-transfer model with NiTiO3 , implying that the composite photocatalysts were applicable for photocatalytic degradation of organic contaminants under the visible-light irradiation. Higher reaction rate constants for the composites prepared with dicyandiamide and thiourea confirmed the significant role of the Ti-N/Ti-O-S bridge between g-C3 N4 and NiTiO3 .
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