磁性Fe3O4-CuO非均相活化过碳酸钠降解AO7

采用一步水热法合成了可磁性回收的Fe₃O₄-CuO材料并通过SEM-EDS和XRD进行表征.利用Fe₃O₄-CuO活化过碳酸盐（SPC）降解偶氮染料AO7，探究了Fe₃O₄-CuO投加量、SPC初始浓度、初始pH值和背景氯离子对Fe₃O₄-CuO/SPC体系降解AO7的影响，分析了体系的主要反应机理.实验结果表明，Fe₃O₄-CuO可以活化SPC降解AO7，反应随Fe₃O₄-CuO和SPC投加量的增加而加快，但过高的SPC投加量反而抑制AO7的降解.由于SPC的缓冲能力，该体系拥有广泛的pH适应能力且反应随着初始pH的升高而加快.染料废水中常见的Cl^-对AO7的降解有促进作用，Cl^-浓度越高降解速度越快.AO7的降解主要发生在材料表面，反应的主要活性物种为·OH，Fe₃O₄-CuO重复使用4次后依旧保持较高的催化活性体现了其良好的稳定性.该体系对AO7具有优异的脱色能力和较好的矿化效果.

Degradation of AO7 with Magnetic Fe3O4-CuO Heterogeneous Catalyzed Sodium Percarbonate System

Magnetically recyclable Fe₃O₄-CuO was synthesized by a one-step hydrothermal method and characterized by scanning electron microscopy coupled with energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD). The degradation of azo dye acid orange 7 (AO7) by percarbonate (SPC) activated with Fe₃O₄-CuO was studied. The effects of Fe₃O₄-CuO catalyst loading, SPC concentration, pH value, and common chloride ions on AO7 degradation in the Fe₃O₄-CuO/SPC system were evaluated. The main reaction mechanism of AO7 degradation was analyzed. The results show that Fe₃O₄-CuO could effectively activate SPC to degrade AO7 and the reaction was accelerated with the increase of Fe₃O₄-CuO dosage. The increase of SPC dosage was favorable for the degradation of AO7, but excessive SPC dosage inhibited the degradation of AO7. Common ions (e.g., Cl^-) in dye wastewater could promote the degradation of AO7, and the degradation rate increased with increasing concentration of Cl^-. The reaction mainly occurred on the surface of the catalyst, and·OH was identified as the main active species for the degradation of AO7. The catalyst Fe₃O₄-CuO showed excellent stability owing to the high catalytic activity remaining after 4 cycles of repeated use. The Fe₃O₄-CuO/SPC system achieved a high mineralization rate in the process of decolorization of AO7.