Nowadays, the impact of textile pollutants such as methylene blue on aquatic systems is intensively serious over the world. There is a growing interest in the mitigation of these textile compounds using recyclable, high-efficiency, and biodegradable materials. Herein, we report a facile casting method for preparing agar/maltodextrin/poly(vinyl alcohol) walled montmorillonite (AMP–MMT) composites. Specifically, sodium montmorillonite clay was incorporated into hydrogel membranes with the loading rates of 0–30% (w v^–1). Composite membranes were physicochemically characterized with physicochemical techniques such as X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and zeta potential measurement. Other measurements of contact angle, moisture, and swelling degree were also conducted. Moreover, the effect of operating parameters such as montmorillonite loading, solution pH, contact time, concentration, and temperature on dye adsorption was explored. Plausible mechanisms of cation exchange, H–bonds, and n–π interactions might shed light on the adsorption of methylene blue on AMP–MMT composite. Nonlinear kinetic and isotherms were used to gain insight into adsorption nature. Composite membrane in our study exhibited high uptake capacity (71.51 mg g^–1), good recyclability (at least five cycles), and easy desorption with green eluent of mixed water and ethanol. This work is expected to encourage the use of recyclable, eco-friendly, and biodegradable hydrogel membranes in the water purification.

如今，亚甲蓝等纺织品污染物对水生系统的影响在世界范围内日益严重。人们越来越关注使用可回收、高效和可生物降解的材料来减轻这些纺织化合物的影响。在此，我们报告了一种用于制备琼脂/麦芽糖糊精/聚乙烯醇壁蒙脱石（AMP-MMT）复合材料的简便浇铸方法。具体而言，钠蒙脱石粘土以 0-30% (wv ^–1）。复合膜的物理化学特性采用物理化学技术，如 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜和 zeta 电位测量。还进行了接触角、水分和溶胀度的其他测量。此外，还探讨了蒙脱石负载量、溶液 pH 值、接触时间、浓度和温度等操作参数对染料吸附的影响。阳离子交换的似是而非的机制，ħ -键，并Ñ -π相互作用可能对亚甲基蓝对AMP-MMT复合吸附线索。非线性动力学和等温线用于深入了解吸附性质。我们研究中的复合膜表现出高吸收能力（71.51 mg g ^–1)，良好的可回收性（至少五次循环），并且易于用混合水和乙醇的绿色洗脱液解吸。这项工作有望鼓励在水净化中使用可回收、环保和可生物降解的水凝胶膜。