A bifunctional CuO-Fe₃O₄ material was synthesized and employed for the photocatalytic degradation of p-arsanilic acid (p-ASA) under visible light irradiation and simultaneous removal of the released inorganic arsenic by adsorption from solution. The effects of major factors, including solution pH, bicarbonate ion, halide ion and humic acid, on the p-ASA degradation were investigated. Under various water quality conditions, an excellent removal of p-ASA could always be achieved by the CuO-Fe₃O₄ photocatalytic process and p-ASA could be completely converted to As(V) within 36 min. Simultaneously, the released As(V) could be adsorbed onto the surface of CuO-Fe₃O₄ nanoparticles with high efficiency above 95% at initial pH range from 4 to 7. The presence of humic acid significantly weakened the degradation of p-ASA by scavenging OH, and slightly inhibited the As(V) removal. On the basis of the UV–vis, FTIR, XPS analysis and the major degradation products detected, the mechanism of the p-ASA photocatalytic degradation and the released As(V) adsorption by CuO-Fe₃O₄ nanoparticles was given, and the degradation pathway of p-ASA during the photocatalytic process was also taken into consideration. Combined with the photocatalytic property and the high adsorption capacity of As(V), the synthesized magnetic CuO-Fe₃O₄ nanoparticles have significant potential applications for controlling the risk of p-ASA in wastewater.

合成了一种双功能CuO-Fe ₃ O ₄材料，并用于可见光照射下对砷酸（p-ASA）的光催化降解，并通过从溶液中吸附同时去除释放的无机砷。研究了溶液pH值，碳酸氢根离子，卤离子和腐殖酸等主要因素对p-ASA降解的影响。在各种水质条件下，始终可以通过CuO-Fe ₃ O ₄光催化过程实现对p-ASA的出色去除，并且p-ASA可以在36分钟内完全转化为As（V）。同时，释放出的As（V）可被吸附到CuO-Fe ₃ O ₄的表面上在初始pH值大于95％时效率高于95％的纳米颗粒。腐殖酸的存在通过清除OH显着减弱了p-ASA的降解，并略微抑制了As（V）的去除。在紫外可见，FTIR，XPS分析和检测到的主要降解产物的基础上，给出了p-ASA光催化降解的机理以及CuO-Fe ₃ O ₄纳米颗粒释放的As（V）吸附，并给出了还考虑了p-ASA在光催化过程中的降解途径。结合光催化性能和As（V）的高吸附能力，合成了磁性CuO-Fe ₃ O ₄ 纳米颗粒在控制废水中p-ASA风险方面具有重要的潜在应用。