Department of Technology of Organic Synthesis, Institute of Chemical Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia.
Nuclear Materials Authority, El Maadi, Cairo 11381, Egypt.
Int J Mol Sci. 2022 Feb 21;23(4):2396. doi: 10.3390/ijms23042396.
The modification of chitosan represents a challenging task in obtaining biopolymeric materials with enhanced removal capacity for heavy metals. In the present work, the adsorption characteristics of chitosan modified with carboxyl groups (CTS-CAA) towards copper (II) and zinc (II) ions have been tested. The efficacy of the synthesis of CTS-CAA has been evaluated by studying various properties of the modified chitosan. Specifically, the functionalized chitosan has been characterized by using several techniques, including thermal analyses (differential scanning calorimetry and thermogravimetry), spectroscopies (FT-IR, XRD), elemental analysis, and scanning electron microscopy. The kinetics and the adsorption isotherms of CTS-CAA towards both Cu (II) and Zn (II) have been determined in the aqueous solvent under variable pH. The obtained results have been analyzed by using different adsorption models. In addition, the experiments have been conducted at variable temperatures to explore the thermodynamics of the adsorption process. The regeneration of CTS-CAA has been investigated by studying the desorption process using different eluents. This paper reports an efficient protocol to synthesize chitosan-based material perspective as regenerative adsorbents for heavy metals.
壳聚糖的修饰是一项具有挑战性的任务，旨在获得具有增强重金属去除能力的生物高分子材料。在本工作中，测试了羧基改性壳聚糖（CTS-CAA）对铜（II）和锌（II）离子的吸附特性。通过研究改性壳聚糖的各种性质，评估了 CTS-CAA 合成的效果。具体来说，使用多种技术对功能化壳聚糖进行了表征，包括热分析（差示扫描量热法和热重分析）、光谱学（FT-IR、XRD）、元素分析和扫描电子显微镜。在不同 pH 值下的水溶液中，确定了 CTS-CAA 对 Cu（II）和 Zn（II）的动力学和吸附等温线。通过使用不同的吸附模型对获得的结果进行了分析。此外，还进行了在不同温度下的实验，以探讨吸附过程的热力学。通过研究不同洗脱剂的解吸过程，研究了 CTS-CAA 的再生情况。本文报道了一种有效的合成壳聚糖基材料的方案，该材料有望成为重金属的可再生吸附剂。
