Applied Surface Science, Vol.470, 150-160, 2019
Two-dimensional g-C3N4/alpha-AgAl(0.4)AGa(0.6)O(2) p-n heterostructure with improved visible-light-driven photocatalytic property
Design and preparation of two-dimensional heterostructure is an effective strategy to obtain enhanced photoelectrochemical and photocatalytic performances. Herein, two-dimensional g-C3N4/alpha-AgAl0.4Ga0.6O2 p-n heterostructure is for the first time synthesized by phase transition method under hydrothermal treatment. It is found that the heterostructure shows the coexistence of two phases with high crystallinity. Platelet-like alpha-AgAl0.4Ga0.6O2 and g-C3N4 sheets couple each other face to face, resulting in the formation of close interfaces and efficient heterojunctions. UV-vis absorption of the heterostructure is modulated efficiently by controlling the phase component When utilized as photocatalysts for MO degradation under visible light irradiation, the g-C3N4/alpha-AgAl0.4Ga0.6O2 with a molar ratio of 0.75 exhibits the most excellent photocatalytic performance with a rate constant of 0.0227 min(-1). The further investigation of the photoelectrochemical property including small diameter of the arc radius and maximum photocurrent indicates that the separation efficiency of electron-hole pairs is greatly improved through heterojunctions with two-dimensional coupling interfaces. Besides, the reaction kinetics and the photocatalytic mechanism related to the energy band are proposed for degrading organic pollutants. The results prove that the g-C3N4/alpha-AgAl0.4Ga0.6O2 heterostructure has great potential application in photocatalysis for eliminating organic pollutants.