Novel Fe₃O₄–Cs_xWO₃/NiAl layered double hydroxide composites (FCW/LDH) for the activation of peroxymonosulfate (PMS) and the succeeding degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) was synthesized through a simple method. The composites prepared were characterized by XRD, SEM, EDS, FT-IR, UV–vis DRS, and N₂ physisorption, respectively. It was found that FCW/LDH could effectively catalyze PMS to generate sulfate radicals (SO₄^•–) to degrade 2,4-D. The added 2,4-D (20 mg/L) was almost completely removed (with a removal of 90.53%) in 180 min by using 1.00 g/L FCW/LDH and 0.50 g/L PMS. Several related factors (PMS concentration, initial pH, disturbing anions) were tested in order to understand their effect on the degradation performance. Furthermore, the photocatalysts exhibited good reusability and stability after four recycles. Finally, a possible degradation mechanism was provided according to theabove experimental results. The desired FCW/LDH composites showed promising application in purifying water.

中文翻译：

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Fe ₃ O ₄ -Cs _x WO ₃ / NiAl层状双氢氧化物复合物对过硫酸单硫酸盐的活化，降解2,4-二氯苯氧基乙酸

合成了新型的Fe ₃ O ₄ –Cs _x WO ₃ / NiAl层状双氢氧化物复合物（FCW / LDH），用于活化过氧单硫酸盐（PMS）和成功降解2,4-二氯苯氧基乙酸（2,4-D）。一种简单的方法。制备的复合材料分别通过XRD，SEM，EDS，FT-IR，UV-vis DRS和N ₂物理吸附进行表征。发现FCW / LDH可以有效催化PMS产生硫酸根（SO ₄ ^•–）降解2,4-D。通过使用1.00 g / L FCW / LDH和0.50 g / L PMS，在180分钟内几乎完全去除了添加的2,4-D（20 mg / L）（去除率为90.53％）。测试了几个相关因素（PMS浓度，初始pH值，干扰阴离子），以了解它们对降解性能的影响。此外，光催化剂在四个循环后表现出良好的可重复使用性和稳定性。最后，根据以上实验结果提供了可能的降解机理。所需的FCW / LDH复合材料在净化水方面显示出有希望的应用。