Cu_(2)(OH)PO_(4)/Bi_(2)WO_(6)复合材料光活化过硫酸盐降解2,4-二氯苯酚和双酚A研究

Degradation of 2,4-dichlorophenol and bisphenol A with persulfate photoactivated by Cu_(2)(OH)PO_(4)/Bi_(2)WO_(6)

采用两步水热法制备不同Cu_(2)(OH)PO_(4)/Bi_(2)WO_(6)复合材料,通过X射线粉末衍射和扫描电子显微镜确定其物相组成和形貌。利用火焰原子吸收光谱测定Cu_(2)(OH)PO_(4)的实际负载量。复合材料用于可见光下活化过硫酸盐(PDS)降解2,4-二氯苯酚(DCP)和双酚A(BPA),Cu_(2)(OH)PO_(4)与Bi_(2)WO_(6)的摩尔比为1∶4时具有最佳的催化性能,可见光光照60 min内DCP和BPA的降解率分别达93.4%和89.8%。对照实验表明,可见光、催化剂和PDS三要素的协同作用促进了BPA的降解。探究了催化剂用量、PDS浓度和BPA初始浓度对BPA降解性能的影响。结果表明催化剂用量越大,BPA降解率越高;PDS浓度对其无明显影响;BPA初始浓度越高,BPA降解速率越慢。自由基捕获剂实验结果表明反应体系中硫酸根自由基(·SO_(4)^(-))和羟基自由基(·OH)是降解BPA的主要活性物种。

Different Cu_(2)(OH)PO_(4)/Bi_(2)WO_(6) 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 Cu_(2)(OH)PO_(4) 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 Cu_(2)(OH)PO_(4)-to-Bi_(2)WO_(6) 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(•SO_(4)^(-))and hydroxyl radicals(•OH)as the primary active species responsible for BPA degradation in the reaction system.