Degradation of 2,4-dichlorophenol and bisphenol A with persulfate photoactivated by Cu2(OH)PO4/Bi2WO6
Different Cu2(OH)PO4/Bi2WO6 composite materials were prepared using a two-step hydrothermal method.The phase composition and morphology of the materials were characterized by X-ray powder diffraction and scanning electron microscopy.The actual loading of Cu2(OH)PO4 was determined using flame atomic absorption spectroscopy.These composites were utilized to activate persulfate(PDS)for degrading 2,4-dichlorophenol(DCP)and bisphenol A(BPA)under visible light.Optimal catalytic performance was achieved with a Cu2(OH)PO4-to-Bi2WO6 molar ratio of 1∶4,with degradation rates of 93.4%for DCP and 89.8%for BPA within 60 minutes of visible light exposure.Control experiments highlighted the synergistic effect of visible light,catalyst,and PDS on promoting BPA degradation.The impact of catalyst dosage,PDS concentration,and initial BPA concentration on the degradation performance of BPA was investigated.Results revealed that higher catalyst dosages led to increased BPA degradation rates,while PDS concentration had no significant influence.Higher initial BPA concentrations correlated with slower degradation rates.Free radical scavenging experiments identified sulfate radicals(·SO4-)and hydroxyl radicals(·OH)as the primary active species responsible for BPA degradation in the reaction system.
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