We present an approach for synthesis of a micro-porous composite of two well-known biopolymers, namely chitosan and alginate, using glutaraldehyde as the cross-linking agent. Alginate and chitosan were pre-treated before being mixed, and the two biopolymers' proportions were also monitored. Chitosan was modified using aniline with the help of formaldehyde crosslinker and then the twizer was further crosslinked with alginate using glutaraldehyde. The synthesized composite, glutaraldehyde cross-linked chitosan–alginate composite [(Cs-F-An)-G-Al] was characterized using spectral techniques and employed as a potential adsorbent for three dyes namely Brilliant green, Methyl orange and Patent Blue V. The pH_PZC of the material was 7.5 and the maximum monolayer adsorption capacity (Q_max) was found to be 235.82, 198.09 and 117.34 mg g⁻¹ for BG (at pH 8.0), MO (at pH 6.0) and PBV (at pH 3.0) respectively. It was found that the adsorption process follows a Freundlich adsorption isotherm and pseudo second order kinetics. A thermodynamic study revealed that the process of adsorption was enthalpy-driven and spontaneous in nature. Interestingly, the values of the adsorption capacity obtained in column adsorption method are in close agreement with those obtained in batch adsorption experiments, which shows the potential of the synthesized composite for uptake of dyes.

我们提出了一种使用戊二醛作为交联剂合成两种众所周知的生物聚合物（即壳聚糖和藻酸盐）的微孔复合材料的方法。海藻酸盐和壳聚糖在混合前进行了预处理，还监测了两种生物聚合物的比例。在甲醛交联剂的帮助下，使用苯胺改性壳聚糖，然后使用戊二醛将镊子与藻酸盐进一步交联。合成的复合物戊二醛交联壳聚糖 - 海藻酸盐复合物 [(Cs-F-An) -G-Al] 使用光谱技术进行表征，并用作三种染料的潜在吸附剂，即亮绿、甲基橙和专利蓝 V。材料的 pH _PZC为 7.5，最大单层吸附容量（Q _max) 被发现对于 BG（pH 8.0）、MO（pH 6.0）和 PBV（pH 3.0）分别为235.82、198.09 和 117.34 mg g ^-1。发现吸附过程遵循 Freundlich 吸附等温线和伪二级动力学。热力学研究表明，吸附过程本质上是焓驱动的和自发的。有趣的是，柱吸附法获得的吸附容量值与批量吸附实验中获得的值非常吻合，这显示了合成复合物对染料吸收的潜力。