Z-type Ag3PO4/G/C3N4 (silver phosphate/graphene/carbon nitride) photocatalyst bridged by graphene (G) and preparation method thereof

Abstract

The invention provides a Z-type Ag3PO4 / G / C3N4 (silver phosphate / graphene / carbon nitride) photocatalyst bridged by graphene (G) and a preparation method thereof. The compound is a ternary composite catalyst bridged by C3N4 and Ag3PO4 phases via graphene (G). The preparation method comprises the following steps of firstly, dispersing the G and C3N4 of graphene lamellar structure into an Ag3PO4 watersolution by ultrasonic waves; then, dripping NaH2PO4 (sodium dihydrogen phosphate), and continuing to stir, so as to form the Ag3PO4 / G / C3N4 ternary compound. In the preparation process, the G and theC3N4 have the similar graphene lamellar structure, and can easily form a tight heterostructure; the specific surface area of the G is high, so that the Ag3PO4 is conveniently dispersed to the surfaceof the G; under the bridging function of the G, the cavities of the C3N4 and the electrons of the Ag3PO4 can be compounded, the remaining C3N4 carries the electrons with more negative energy level, and more super-oxygen negative ions are formed; the remaining Ag3PO4 phase carries the cavities with more positive energy level, the oxidization ability is stronger, and the photodegrading reaction isfavorably performed. The preparation method has the advantages that the operation is simple, and the reaction conditions are moderate. The prepared catalyst has good stability and high photocatalysisdegrading characteristic for the dye.

Description

technical field [0001] The invention relates to a Z-type Ag 3 PO 4 / G / C 3 N 4 The invention discloses a (G: graphene) photocatalyst and a preparation method thereof, which belong to the field of nanocomposite materials and visible light catalytic pollutant degradation. Background technique [0002] Ag 3 PO 4 The forbidden band width is 2.45eV, the conduction band potential is -0.45eV, and the valence band potential is 2.9eV. Under visible light irradiation, it has strong photocatalytic activity of decomposing water to prepare oxygen and photodegradation of dyes. But Ag 3 PO 4 When used as a catalyst alone, it has many disadvantages, such as low light utilization rate and can only absorb light of a certain wavelength; photogenerated carriers are easy to recombine; photocorrosion reactions are prone to occur, and the stability of the catalyst is poor. C 3 N 4 It has a suitable energy level potential, the valence band potential is 1.4eV, and the conduction band potent...

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Problems solved by technology

And to have high charge transport capability, with and C 3 N 4 Graphene sheets with similar graphitic lamellar structure serve as bonds, and Z-type Ag as a photogenerated carrier transporter for the Z-reaction system 3 PO 4 / G / C 3 N 4 Composite catalysts have not been reported

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