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AgBr/CuO Photoelectrode Dynamic Diaphragm Electrocatalytic System for RB5 Degradation: Response Surface Optimization and Energy Analysis
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DOI：10.1149/1945-7111/ae67a7.png)
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Abstract
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This study developed a photocathode-assisted dynamic flow diaphragm electrochemical system to address the high energy consumption and low mass transfer efficiency in azo dye wastewater treatment, using Reactive Black 5 (RB5) as a model pollutant. The system enhances mass transfer and reaction selectivity by physically separating the anode and cathode chambers and employing a continuous circulation flow. The integration of an AgBr/CuO heterojunction as an auxiliary photoelectrocatalytic cathode was designed to leverage visible light for synergistic enhancement of the degradation process. Process optimization using the Box-Behnken response surface methodology identified the optimal conditions as follows: voltage of 13.12 V, light intensity of 303.46 mW cm-2, NaCl concentration of 0.10 mol l-1, and electrode spacing of 4 cm. Under these conditions, a 60 min reaction achieved a decolorization rate of 99.41% and a COD removal rate of 60.02%. Energy consumption analysis revealed that at approximately 90% decolorization, the total energy consumption was 23.6% lower than that of the non-light-assisted system. Mechanistic investigation indicated that RB5 removal proceeds through synergistic pathways, including direct anodic oxidation, hydroxyl radical attack, and active chlorine oxidation. The results demonstrate that this photocathode-integrated design offers a promising strategy for the low-carbon and efficient treatment of azo dye wastewater.
Keywords:
electrocatalysis
dynamic membrane reactor
azo dye degradation
AgBr/CuO heterojunction
response surface
energy consumption analysis
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3.3
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3.3W
Citations:
9.4W
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