不同的染料被排放到水流中,对整个生态系统造成严重污染。本工作涉及通过基于壳聚糖衍生化的绿色吸附剂去除酸性红2染料(甲基红作为阴离子染料)。在这方面,通过在30kGy下进行γ辐射制备了两类壳聚糖衍生物-总共六种。第一组(A组)构成具有不同进料比的交联壳聚糖/聚丙烯酰胺/氧化铝,而第二组,标识为B组,由不同比例的交联羧甲基壳聚糖/聚丙烯酰胺/氧化铝组成。加入甘油以软化所得的水凝胶。产品的特点是不同的工具,包括用于确认化学修饰的FTIR,TGA用于研究它们的热性能,和XRD验证其晶体结构。通过SEM研究了所制备的衍生物的形貌,同时通过AFM监测染料吸附前后的形貌。在不同的操作条件下,验证了所制备吸附剂的去除效率。如pH值,温度,吸附剂剂量,染料溶液的初始浓度,接触时间。数据表明,最大染料吸收的最佳条件如下:pH4,接触时间120分钟,0.1克吸附剂剂量,和50-ppm的染料浓度。此外,制备的吸附剂表现出强大的吸附能力和去除效率。发现第二组的元素比它们的对应物表现出更高的性能。数据还表明,吸附过程最符合Freundlich模型,并服从伪一级动力学等温线。此外,合成的复合物对作为革兰氏阴性细菌的大肠杆菌和作为革兰氏阳性细菌的金黄色葡萄球菌显示出可观察的抗菌效力。
Different dyes are discharged into water streams, causing significant pollution to the entire ecosystem. The present work deals with the removal of acid red 2 dye (methyl red-as an anionic dye) by green sorbents based on chitosan derivatization. In this regard, two classes of chitosan derivatives-a total of six-were prepared by gamma irradiation at 30 kGy. The first group (group A) constitutes a crosslinked chitosan/polyacrylamide/aluminum oxide with different feed ratios, while the second group, identified as group B, is composed of crosslinked carboxymethyl chitosan/polyacrylamide/aluminum oxide with different ratios. Glycerol was added to soften the resultant hydrogels. The products were characterized by different tools, including FTIR for confirming the chemical modification, TGA for investigating their thermal properties, and XRD for verifying their crystalline structure. The morphology of the prepared derivatives was studied through SEM, while their topography before and after dye adsorption was monitored via the AFM. The removal efficiencies of the prepared sorbents were verified at different operation conditions, such as pH, temperature, adsorbent dose, initial concentration of dye solutions, and contact time. The data revealed that the optimum conditions for maximum dye uptake were as follows: pH 4, contact time 120 min, 0.1-g sorbent dose, and 50-ppm dye concentration. Additionally, the prepared sorbents demonstrated potent adsorption capacity and removal efficiency. It was found that the elements of the second group displayed higher performance than their counterparts. The data showed also that the adsorption process best fits with the Freundlich model and obeyed pseudo-first-order kinetic isotherm. In addition, the synthesized composites showed observable antibacterial potency toward E. coli as a Gram-negative bacterium and S. aureus as a Gram-positive bacterium.