BACKGROUND To enhance photocatalyst activity, a Z‐scheme ternary heterojunction of g‐C3N4 and BiOI co‐modified with Bi2WO6 (BiOI/g‐C3N4/Bi2WO6 (BCB)) was prepared. The double Z‐scheme catalyst is advantageous but not well studied for compositing low‐cost g‐C3N4 with Bi‐containing components such as BiOI and Bi2WO6. RESULTS For g‐C3N4 and BiOI, we determined the optimal doping ratios of 3 wt% BiOI/10 wt% g‐C3N4 /Bi2WO6. It catalyzed almost complete degradation of (100 mg L−1) rhodamine B (RhB) under visible light irradiation (95% in 20 min and 100% in 30 min), with a significant reaction kinetic constant of 0.245 min−1. The remaining high total organic carbon removal rate of RhB, even after five cycles of the experiment, and the good removal effect for different concentrations of tetracycline (TC) proved the effectiveness of the catalyst. CONCLUSION The e−, h+, and ·OH, ·O2− reactive species work together, leading to rapid pollutant degradation. The developed triple‐component double Z‐scheme heterojunction catalyst has promising applications in pollution control. © 2022 Society of Chemical Industry (SCI).
BACKGROUND Advanced oxidation technologies such as photocatalysis assisted by hydrogen peroxide (H2O2) are significantly more effective. Their synergy may greatly improve the degradation efficiency of pollutants with proper catalysts. In this study, a series of iron Metal organic framework/bismuth oxybromide (Fe‐MOF/BiOBr) catalysts were prepared, and their properties examined using Rhodamine B (RhB) as the target pollutant. Through comparison tests of photocatalysis and activating H2O2 under visible light‐initiated oxidation reaction, the catalyst, the degradation effect and reaction conditions were optimized. RESULTS All of the composites showed better photocatalysis performance than the pure BiOBr and Fe‐MOF, and the catalytic efficiency of a composite sample MB1 with 5 mg Fe‐MOF in BiOBr was the highest. When MB1 was applied to aheterogenous Fenton‐like reaction involving H2O2 and photocatalysis under visible light ([H2O2] = 10 mmol L–1), the capacity for degradation of RhB increased to 11.1 mg/(mg·min) whereas it was only 4 mg/(mg·min) by photocatalysis alone. In addition, the optimal reaction conditions were pH 5 and 50 W light. The mechanism study showed that 1 O2 and ·O2− were the main active species for pollutant degradation. CONCLUSION This study provides a new and highly efficient catalyst to heterogeneously activate H2O2 under visible light to degrade a pollutant. The developed Fe‐MOF/BiOBr combination has great application potential. © 2022 Society of Chemical Industry (SCI).
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