Vapor deposition of g-C3N4 on TiO2 nanosquares for efficient photodegradation of MB and Cr6+ under visible light
Herein, a novel composite photocatalyst was prepared by the vapor deposition of g-C 3 N 4 on TiO 2 nanosquare, dominated with {001} facets. The deposition method is robust, convenient, and effective. The surface topography and structure of the composites were analyzed by XRD , XPS, SEM, and TEM . The mechanism for enhanced photocatalysis was studied using PL, PC, UV–vis-NIR-DRS, TRPL, EIS and EPR. The photocatalytic activities of the fabricated composites were evaluated by the degradation of methylene blue (MB) and hexavalent chromium ions (Cr 6+ ) under visible light irradiation. The photodegradation of MB and Cr 6+ was completed in 50 and 40 min, respectively. Based on a pseudo-first-order kinetic model (ln(C 0 /C) = kt), the measured the degradation rate constant for MB using gCN/TO5 was 4.6 and 35.9 times higher than that of pure g-C 3 N 4 and TiO 2 , respectively. Similar results were found for the Cr 6+ degradation. The outstanding photocatalytic performance of the g-C 3 N 4 on TiO 2 composite was ascribed to the presence of the TiO 2 /g-C 3 N 4 heterojunctions , which effectively improved the separation of the photoexcited electrons and holes hence the enhancement of visible-light photoactivity . Overall, this work showed a convenient and efficient method for fabricating the visible light photocatalysts with established possible mechanisms for the photoactivity of the hybrid photocatalytic composite material.
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