Abstract
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.
Highlights
Hydrogen peroxide (H2O2) is a highly efficient and green oxidant because it has a high content of active oxygen (47% w/w) and results in only H2O as a by-product.[1,2] Industrially, H2O2 is produced by the anthraquinone method, in which energy consumption is high because of the multistep hydrogenation and oxidation reactions
The H2O2 can be decomposed by reduction with eÀ, which has caused the H2O2 production rate of this photocatalytic reduction method to be unsatisfactory to date (reaction (2))
Still 1.5 mmol LÀ1 H2O2 is obtained in the absence of O2. These results indicate that H2O2 is produced by O2 reduction over AgBr/GCN(1 : 3)
Summary
Hydrogen peroxide (H2O2) is a highly efficient and green oxidant because it has a high content of active oxygen (47% w/w) and results in only H2O as a by-product.[1,2] Industrially, H2O2 is produced by the anthraquinone method, in which energy consumption is high because of the multistep hydrogenation and oxidation reactions. The as-prepared AgBr–Br–g-C3N4 composite catalyst shows the highest H2O2 equilibrium concentration of 3.9 mmol LÀ1, 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.
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