Contamination of surface and groundwater with glyphosate, used widely on crops to control weeds, can cause severe environmental damage. Processes for glyphosate removal from water bodies have been developed, but few are effective and all are expensive. This objective of the present study was to investigate the use of a layered double oxide as a potentially effective and inexpensive material to remove glyphosate from water. Equilibrium, kinetics, and adsorption mechanisms were evaluated, in addition to the effects of competing anions and temperature on glyphosate adsorption. Up to 95% of glyphosate was removed from a synthetic solution in 50 min by Zn₂Al-LDO (layered double oxide in Zn/Al ratio of 2:1) at pH 10. The adsorption isotherms were type L and the Langmuir model best fitted the experimental data, with a q_max value of 191.96 μg mg^–1 at 25°C. The XRD pattern did not support the hypothesis of intercalation of glyphosate anions, whereas Fourier-transform infrared and solid-state ¹³C and ³¹P magic angle spinning nuclear magnetic resonance confirmed the adsorption of glyphosate anions on the Zn₂Al-LDO surface, through carboxylate and phosphonate moiety interactions with end-on and side-on modes. The degree of removal of glyphosate increased with increasing temperature and decreased with increasing concentration of competing anions, with carbonate anions having the most prominent effect on the inhibition of glyphosate adsorption. The adsorption kinetics fitted a pseudo-first order law. Moreover, the intraparticle diffusion model suggested that the adsorption process depends on the formation and thickness of the film at the solution/solid interface.

广泛用于农作物控制杂草的草甘膦污染地表水和地下水，可能造成严重的环境破坏。已经开发出了从水体中去除草甘膦的方法，但有效的方法很少，而且都很昂贵。本研究的目的是研究使用层状双氧化物作为一种潜在有效且廉价的材料来去除水中的草甘膦。除了竞争性阴离子和温度对草甘膦吸附的影响之外，还评估了平衡、动力学和吸附机制。_{Zn 2}在 50 分钟内从合成溶液中去除了高达 95% 的草甘膦Al-LDO（层状双氧化物，Zn/Al 比例为 2:1），pH 10。吸附等温线为 L 型，Langmuir 模型最适合实验数据，25 时 q 最大值为191.96 _μg mg ^–1 °C。XRD图谱不支持草甘膦阴离子嵌入的假设，而傅里叶变换红外和固态¹³ C和³¹ P魔角旋转核磁共振证实了草甘膦阴离子在Zn _{2上的吸附}Al-LDO 表面，通过羧酸根和膦酸根部分以端上和侧上模式相互作用。草甘膦的去除程度随着温度的升高而增加，并随着竞争性阴离子浓度的增加而降低，其中碳酸根阴离子对草甘膦吸附的抑制作用最显着。吸附动力学符合伪一级定律。此外，颗粒内扩散模型表明吸附过程取决于溶液/固体界面处薄膜的形成和厚度。