In this work, a two-component modified AgBr-Br-g-C3N4 composite catalyst with outstanding photocatalytic H2O2 production ability is synthesized. XRD, UV-Vis, N2 adsorption, TEM, XPS, EPR and PL were used to characterize the obtained catalysts. The as-prepared AgBr-Br-g-C3N4 composite catalyst shows the highest H2O2 equilibrium concentration of 3.9 mmol L-1, which is 7.8 and 19.5 times higher than that of GCN and AgBr. A "two channel pathway" is proposed for this reaction system which causes the remarkably promoted H2O2 production ability. In addition, compared with another two-component modified catalyst, Ag-AgBr-g-C3N4, AgBr-Br-g-C3N4 composite catalyst displays the higher photocatalytic H2O2 production ability and stability.
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