This research article presents the fabrication of NH₂-terephthalic acid crosslinked chitosan-bentonite composite, which adopted a facile synthesis approach and offered efficient adsorption capacity for organic dyes. A novel hydrogel material named CB 5:1 demonstrated remarkable adsorption for anionic dyes (Congo red (CR) and brilliant blue (BB)) while showing a negligible affinity for cationic dyes. Adsorption isotherm studies revealed the adsorption capacity of 4950 mg/g and 2053 mg/g (per g of composite's dry weight) for CR and BB following the Langmuir adsorption model. Kinetics and thermodynamic studies were also conducted while the adsorption of anionic dyes in the presence of metal ions, cationic dyes, anionic dyes, and in simulated water remained unaffected. Laccase, an industrially important enzyme, was also immobilized on CB 5:1 to achieve enzyme stability and reusability, resulting in a staggering immobilization capacity (4782 mg/g) at pH 6.0. Laccase immobilized product was employed to perform dye degradation (> 90 % for CR and > 75 % for BB), and the reusability was tested. Overall, our crosslinked product proved appealing for removing high concentrations of anionic organic dyes from polluted water and could be envisaged for practical use.

本研究文章介绍了NH ₂ -对苯二甲酸交联壳聚糖-膨润土复合材料的制备，该复合材料采用简便的合成方法，并对有机染料具有高效的吸附能力。一种名为 CB 5:1 的新型水凝胶材料表现出对阴离子染料（刚果红 (CR) 和亮蓝 (BB)）的显着吸附作用，同时对阳离子染料的亲和力可忽略不计。吸附等温线研究表明，按照 Langmuir 吸附模型，CR 和 BB 的吸附容量分别为 4950 mg/g 和 2053 mg/g（每克复合材料干重）。还进行了动力学和热力学研究，同时阴离子染料在金属离子、阳离子染料、阴离子染料以及模拟水中的吸附不受影响。漆酶是一种工业上重要的酶，也被固定在 CB 5:1 上，以实现酶的稳定性和可重复使用性，从而在 pH 6.0 下产生惊人的固定容量 (4782 mg/g)。采用漆酶固定化产物进行染料降解（CR>90%，BB>75%），并测试可重复使用性。总体而言，我们的交联产品被证明对于从污水中去除高浓度阴离子有机染料具有吸引力，并且可以设想用于实际应用。