A one-step, green process is reported for synthesis of poly([2-(methacryloyloxy)ethyl] trimethylammonium chloride) (PMETAC) modified bentonite (Bent-PMETAC). The Bent-PMETAC was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Zeta potential, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The results indicated that large amounts of PMETAC were successfully grafted on the surface and interlayers of bentonite, and changed the Zeta potential of the sample from negative to positive. Acid Orange 7 (AO 7), as adsorbate, was used to test the anionic dye adsorption of the samples. The batch adsorption results implied that this novel Bent-PMETAC adsorbent exhibited a much higher removal (95%) of AO 7 than bentonite (10%). In addition, the adsorption process was hardly influenced by pH, which is in good agreement with the results of the Zeta potential analysis. The equilibrium adsorption isotherms and the adsorption kinetics of AO 7 fitted well to the Langmuir model and pseudo-second-order kinetic model, respectively. The maximum adsorption capacity of AO 7 onto Bent-PMETAC was 208.6 mg·g⁻¹ at 298 K, which is much higher than for most other materials. Overall, the results indicated the Bent-PMETAC is a low-cost, simple synthesis and highly efficient adsorbent for anionic dye removal from aqueous solutions.

报道了一种一步绿色方法，用于合成聚（[2-（甲基丙烯酰氧基氧基）乙基]三甲基氯化铵）（PMETAC）改性膨润土（Bent-PMETAC）。Bent-PMETAC的特征在于X射线衍射（XRD），傅立叶变换红外光谱（FTIR），Zeta电位，扫描电子显微镜（SEM）和热重分析（TGA）。结果表明，大量的PMETAC成功地接枝到了膨润土的表面和夹层上，并将样品的Zeta电位从负变为正。酸性橙7（AO 7）作为被吸附物，用于测试样品对阴离子染料的吸附。分批吸附的结果表明，这种新型的Bent-PMETAC吸附剂比膨润土（10％）具有更高的AO 7去除率（95％）。此外，吸附过程几乎不受pH值的影响，这与Zeta电位分析的结果非常吻合。AO 7的平衡吸附等温线和吸附动力学分别很好地拟合了Langmuir模型和拟二阶动力学模型。AO 7在Bent-PMETAC上的最大吸附量为208.6 mg·g298 K时为^-1，这比大多数其他材料要高得多。总体而言，结果表明Bent-PMETAC是一种低成本，简单的合成方法，是从水溶液中去除阴离子染料的高效吸附剂。