Abstract
A hexagonal shaped nickel oxide/graphitic carbon nitride (NiO/g-C3N4) heterojunction composite was synthesized via a facile microwave irradiation route joint with succeeding calcination process. The structural, morphological and optical properties of the catalysts were characterized by XRD, TEM, Raman, UV–DRS, PL and BET analysis. XRD and TEM results exposed that cubic structure and with two dimensional hexagonal discs shaped morphology with sizes in the range of 30–40 nm. The incorporation of g-C3N4 caused a red-shift of the UV–Vis absorption edge of NiO. Moreover, exfoliation of bulk g-C3N4 into two dimensional g-C3N4 nanodiscs offers large surface area (102 m2/g) and exposed active sites, which are beneficial for photocatalytic activity enhancement. The photocatalytic activity of the photocatalysts was analyzed by degradation of congo-red and malachite green (MG) under induced visible light irradiation. The results demonstrates that NiO/g-C3N4 with 1.2 mass ratios shows the optimal overall photocatalytic performance such as huge degradation efficiency (97%), high rate constant (0.02012 min−1) and high stability (only loss ~ 3.5) after 7 cycles test (for MG dye). The superior photoactivity of NiO–g-C3N4 photocatalysts possibly will be recognized to the successful interfacial charge transfer between NiO and g-C3N4, thus suppressing the recombination of the photoexcited electron–hole pairs.
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