Study on dye removal by dual Z-Scheme MIL-88A (Fe)/Ag3PO4/AgI photo-Fenton catalyst
BAN Sa1,2, ZHU Hao2, WANG Tong2, HUANG Na2, CAO Jin-rong2, ZHANG Hui-jie2, FAN Hua2, ZHOU Rui2, YIN Da-xue1
1. College of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810000, China; 2. College of Earth and Environment Sciences, Lanzhou University, Lanzhou 730000, China
Abstract：In this study, the double Z-type ternary composite MIL-88A (Fe)/Ag3PO4/AgI(MAI) was successfully synthesized by in-situ precipitation method and ion exchange method using MIL-88A (Fe) as the support. MAI was applied to the photo-Fenton system to efficiently remove Rhodamine B(RhB) from dye wastewater. The rod-shaped MIL-88A (Fe) was used as a carrier to reduce the agglomeration of Ag3PO4 and AgI particle. The formation of a double Z-type heterojunction reduced the recombination of electorn-hole pairs and improved photocatalytic activity. Under the best optimized condition of 0.5g/L catalyst, initial pH 3.0, 0.4mmol/L H2O2, 100mL 20mg/L RhB, RhB was completely degraded RhB within 20min. The catalyst could be maintained high catalytic property after 5cycles. In addition, free radical capture experiments and electron spin resonance experiments showed that h+, O2·﹣and HO· were the main active substances in the MAI/Vis/H2O2 catalytic system. Finally, a possible mechanism for the catalysis of MAI was proposed.
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