College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China.
College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China.
Environ Pollut. 2020 May;260:114038. doi: 10.1016/j.envpol.2020.114038. Epub 2020 Jan 21.
Copper ferrite (denoted as CuFeO), prepared via a complexation reaction to obtain bimetal-organic frameworks (Cu/Fe bi-MOFs), followed by a combustion process to remove the MOF template, is employed as a heterogeneous activator to promote sulfite autoxidation for the removal of organic contaminants. At pH 8.0, more than 80% of the recalcitrant organic contaminant iohexol (10 μM) can be removed within 2 min by the activation of sulfite (500 μM) with CuFeO (0.1 g L). CuFeO exhibits more pronounced catalytic activity in accelerating sulfite autoxidation for iohexol abatement compared to that fabricated by hydrothermal and sol-gel combustion methods. Radical quenching studies suggest that the sulfate radical (SO) is the main reactive species responsible for iohexol abatement. The performance of CuFeO/sulfite for iohexol abatement can be affected by several critical influencing factors, including the solution pH and the presence of humic acid, Cl, and HCO. The effect of the ionic strength and the results of the attenuated total reflectance-Fourier transform infrared (ATR-FTIR) analysis indicate that sulfite autoxidation in the presence of CuFeO involves an inner-sphere interaction with the surface Cu(II) sites of CuFeO. X-ray photoelectron spectroscopy (XPS) characterization suggests that the surface Cu(II)-Cu(I)-Cu(II) redox cycle is responsible for efficient SO production from sulfite. Overall, CuFeO can be considered an alternative activator for sulfite autoxidation for potential application in the treatment of organic-contaminated water.
铜铁氧体（表示为 CuFeO）通过络合反应制备，以获得双金属有机骨架（Cu/Fe 双金属 MOF），然后通过燃烧过程去除 MOF 模板，用作非均相活化剂以促进亚硫酸盐自氧化以去除有机污染物。在 pH 8.0 下，通过 CuFeO（0.1 g/L）活化 500 μM 的亚硫酸盐，可在 2 分钟内去除超过 80%的难处理有机污染物碘海醇（10 μM）。与水热和溶胶-凝胶燃烧法制备的 CuFeO 相比，CuFeO 在加速亚硫酸盐自氧化以去除碘海醇方面表现出更显著的催化活性。自由基猝灭研究表明，硫酸根自由基（SO）是主要的反应性物种，负责去除碘海醇。CuFeO/亚硫酸盐对碘海醇去除的性能可能受到几个关键影响因素的影响，包括溶液 pH 值和腐殖酸、Cl 和 HCO 的存在。离子强度的影响和衰减全反射-傅里叶变换红外（ATR-FTIR）分析的结果表明，在 CuFeO 存在下的亚硫酸盐自氧化涉及与 CuFeO 表面 Cu(II)位的内球相互作用。X 射线光电子能谱（XPS）表征表明，表面 Cu(II)-Cu(I)-Cu(II)氧化还原循环负责从亚硫酸盐高效产生 SO。总体而言，CuFeO 可被视为亚硫酸盐自氧化的替代活化剂，有望在处理有机污染水方面得到应用。
