Removal of bisphenol A from water by peracetic acid activated by copper-magnesium spinel

doi:10.19965/j.cnki.iwt.2024-0234

Abstract

Abstract:

Spinel material MgCu₂O₄ was prepared by sol-gel to activate peracetic acid(PAA) for efficiently remove bisphenol A(BPA) from water. The MgCu₂O₄/PAA advanced oxidation system was constructed to degrade BPA. The morphology and microstructure of MgCu₂O₄ were characterized by SEM, XPS, XRD and BET. The effects of pH, dosage of peracetic acid, dosage of MgCu₂O₄, common anion in water and humic acid on the degradation of bisphenol A in MgCu₂O₄/PAA system were studied, and the mechanism of MgCu₂O₄ activating PAA was also investigated. The results showed that MgCu₂O₄ had been successfully prepared with a specific surface area of 63.472 7 m²/g. When the initial BPA concentration was 10 μmol/L, pH was 7, MgCu₂O₄ dosage was 0.2 g/L, and PAA dosage was 0.3 mmol/L, the system could completely degrade BPA in 11 min. MgCu₂O₄ showed high efficiency in the degradation of BPA in the pH range of 4-10. Anion and humic acid could inhibit the degradation rate of MgCu₂O₄/PAA system to different degrees. Free radical quenching experiment, ESR and XPS analysis jointly revealed that there were free radical and non-free radical pathways for the degradation of bisphenol A by MgCu₂O₄/PAA system, among which ¹O₂ in the non-free radical pathway was the main active substance in the system,and CH₃C(O)OO· in the free radical pathway also made a significant contribution. The BPA degradation rate of MgCu₂O₄/PAA could reach 87.39% after four recycling experiments, which indicated that spinel MgCu₂O₄ had a good reuse ability.

Key words: bimetallic catalyst, spinel, peracetic acid, bisphenol A, catalytic degradation

摘要：

为高效去除水中双酚A（BPA），采用溶胶-凝胶法制备了尖晶石材料MgCu₂O₄用于活化过氧乙酸（PAA），构建MgCu₂O₄/PAA高级氧化体系降解BPA。采用SEM、XPS、XRD、BET对MgCu₂O₄的形貌和微观结构进行表征，研究pH、PAA投加量、MgCu₂O₄投加量、水中常见阴离子和腐殖酸对MgCu₂O₄/PAA体系降解BPA的影响，并对MgCu₂O₄活化PAA的机制进行研究。结果表明：MgCu₂O₄被成功制备，材料比表面积达到63.472 7 m²/g。在初始BPA浓度为10 μmol/L，pH为7，MgCu₂O₄投加量为0.2 g/L，PAA投加量为0.3 mmol/L时，体系11 min即可完全降解BPA，MgCu₂O₄在pH为4~10的范围内均表现出对BPA的高效降解。阴离子和腐殖酸对MgCu₂O₄/PAA体系的降解速率有不同程度的抑制作用。自由基猝灭实验、ESR和XPS分析共同揭示了MgCu₂O₄/PAA体系对BPA的降解存在自由基途径和非自由基途径，其中非自由基途径的¹O₂是体系的主要活性物质，自由基途径的CH₃C（O）OO·也有较大贡献。经过4次回收重复实验，MgCu₂O₄/PAA的BPA降解率可达87.39%，表明尖晶石MgCu₂O₄具有较好的重复利用性。

关键词: 双金属催化剂, 尖晶石, 过氧乙酸, 双酚A, 催化降解

CLC Number:

X703.1

Xin DAI, Banghai LIU, Luyao GAO, Qizhi JIANG, Chunji JIN. Removal of bisphenol A from water by peracetic acid activated by copper-magnesium spinel[J]. Industrial Water Treatment, 2025, 45(4): 139-147.

代鑫, 刘邦海, 高璐瑶, 江奇志, 金春姬. 铜镁尖晶石活化过氧乙酸去除水中双酚A[J]. 工业水处理, 2025, 45(4): 139-147.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0234

https://www.iwt.cn/EN/Y2025/V45/I4/139

Figures/Tables 14

Fig.1 SEM images of MgCu₂O₄

Table 1 BET analysis results of MgCu₂O₄ spinel

项目	比表面积/（m²·g^-1）	孔容/（cm³·g^-1）	孔径/nm
数值	63.472 7	0.391 402	24.799 8

Fig.2 N₂ adsorption curves of MgCu₂O₄

Fig.3 XRD image of MgCu₂O₄

Fig.4 XPS images of MgCu₂O₄

Fig.5 Ability of MgCu₂O₄ to degrade BPA in different oxidation systems

Fig.6 Effect of different pH on degradation of BPA by MgCu₂O₄/PAA system

Fig.7 Effect of different MgCu₂O₄ dosages on degradation of BPA by MgCu₂O₄/PAA system

Fig.8 Effect of different PAA dosages on degradation of BPA by MgCu₂O₄/PAA system

Fig.9 Effects of common anions and humic acids in natural water on degradation of BPA by MgCu₂O₄/PAA system

Fig.10 Free radical quenching experiment of MgCu₂O₄/PAA system

Fig.11 ESR spectra of MgCu₂O₄/PAA system

Fig.12 XPS images of MgCu₂O₄ before and after use

Fig.13 Performance of reusing MgCu₂O₄ four times

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