In this study, a novel copolymer hydrogel according to poly (acrylonitrile-co-sodium styrene sulfonate) (ASD) as an effective adsorbent was prepared via free radical polymerization of the solution at a ratio of 1:1 to remove cationic crystal violet dye (CV) from wastewater. The prepared hydrogel was thoroughly characterized using FTIR, TGA, SEM and EDX analysis. The hydrogel that was produced has a notable capacity for adsorbing cationic dye uptake over a wide pH range as well as easily separated without the need for filtration and centrifugation. Under optimal conditions using 1 g/L of hydrogel, 400 mg/L dye concentration and contact time of 5 h, the prepared hydrogel showed high dye removal efficiency approaching 100 %. The sulfonated copolymer hydrogel has a maximum adsorption capacity of 518.49 mg/g, which is six times larger than pristine PAN. The Langmuir model properly represented the isotherm adsorption data, however the kinetics data was better described by the pseudo-second-order model. Based on the calculated thermodynamic characteristics, the process of CV dye adsorption on sulfonated copolymer hydrogel surface wasspontaneous and exothermic.

中文翻译：

---

使用磺化共聚物水凝胶有效去除污水中的有害阳离子染料：合成、非线性等温线和动力学研究

在这项研究中，以聚（丙烯腈-苯乙烯磺酸钠）（ASD）为有效吸附剂，通过溶液以1：1的比例进行自由基聚合，制备了一种新型共聚物水凝胶，以去除阳离子结晶紫染料（ CV）来自废水。使用 FTIR、TGA、SEM 和 EDX 分析对制备的水凝胶进行了彻底的表征。所生产的水凝胶在较宽的 pH 范围内具有显着的吸附阳离子染料的能力，并且无需过滤和离心即可轻松分离。在水凝胶浓度为1 g/L、染料浓度为400 mg/L、接触时间为5 h的最佳条件下，制备的水凝胶表现出接近100%的高染料去除效率。磺化共聚物水凝胶的最大吸附容量为518.49 mg/g，是原始PAN的六倍。 Langmuir 模型正确地表示了等温吸附数据，但伪二阶模型可以更好地描述动力学数据。根据计算的热力学特性，CV染料在磺化共聚物水凝胶表面的吸附过程是自发且放热的。