Today, the excessive and increasing use of phenoxy family herbicides such as 2-methyl-4-chlorophenoxyacetic acid (MCPA) and (2,4- dichlorophenoxy) acetic acid (2,4-DCPA) for reasons such as indestructibility and pollution of groundwater resources is one of the most important environmental problems. Pesticide adsorbents like layered double hydroxides (LDHs) are commonly utilized due to their straightforward synthesis, substantial specific surface area resulting from their layered structure, and the potential for surface modification. These natural minerals serve as effective options for adsorption. In this study, a co-precipitation approach was used to create an MgAl-LDH@Fe₃O₄ magnetic adsorbent for the simultaneous removal of MCPA and 2,4-DCPA herbicides from aqueous solution. Using different techniques such as TGA, XRD, FESEM, EDS and zeta potential, we investigated the properties of the prepared adsorbent. The partial least squares method measures the concentration of each herbicide in their mixture. The optimization of MCPA and 2,4-DCPA simultaneous adsorption by LDH was achieved through Doehlert experimental design and the response surface method. The optimal conditions for absorption were determined to be an adsorbent dose of 40.20 mg L^-1, a pH of 6.8, and an initial concentration of 28.35 mg L^-1. In this work, the equilibrium, kinetic, and thermodynamic absorption data of the absorption process were studied, and the obtained results were well described by the Freundlich model, and the pseudo-second-order model, respectively, and showed the spontaneity of the absorption process in this research. The highest absorption capacities of MCPA and 2.4-DCPA herbicides on the prepared adsorbent were 134.50 and 131.30 mg g^-1, respectively.

Graphical abstract

中文翻译：

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磁化MgAl-LDH@Fe3O4复合材料同时去除水介质中的苯氧基除草剂、2-甲基-4-氯苯氧基乙酸和2,4-二氯苯氧基乙酸：偏最小二乘法和Doehlert实验设计的应用

如今，由于不可破坏和污染地下水等原因，苯氧基除草剂如2-甲基-4-氯苯氧基乙酸（MCPA）和（2,4-二氯苯氧基）乙酸（2,4-DCPA）的过量和增加使用资源问题是最重要的环境问题之一。层状双氢氧化物 (LDH) 等农药吸附剂因其合成简单、层状结构产生的巨大比表面积以及表面改性的潜力而被广泛使用。这些天然矿物质是吸附的有效选择。在本研究中，采用共沉淀方法制备了 MgAl-LDH@Fe ₃ O ₄磁性吸附剂，用于同时去除水溶液中的 MCPA 和 2,4-DCPA 除草剂。使用不同的技术，如 TGA、XRD、FESEM、EDS 和 zeta 电位，我们研究了所制备的吸附剂的性能。偏最小二乘法测量混合物中每种除草剂的浓度。通过Doehlert实验设计和响应面法实现了LDH同时吸附MCPA和2,4-DCPA的优化。确定最佳吸附条件为吸附剂用量40.20 mg L ^-1、pH 6.8、初始浓度28.35 mg L ^-1。本文研究了吸收过程的平衡、动力学和热力学吸收数据，所得结果分别用Freundlich模型和伪二阶模型很好地描述了吸收过程的自发性本研究的过程。制备的吸附剂对MCPA和2.4-DCPA除草剂的最高吸附容量分别为134.50和131.30 mg g ^-1。

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