College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, PR China.
College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, PR China.
Bioresour Technol. 2022 Dec;365:128112. doi: 10.1016/j.biortech.2022.128112. Epub 2022 Oct 13.
A pyridinium functionalization chitosan (PCS) at high yield was facilely and solvothermally obtained from reactions of chitosan with N-2,4-dinitrophenyl-pyridinium chloride. The morphology and physical-chemical properties of PCS were tested with various techniques. Its sorption behaviors towards methyl orange (MO) and Cr(VI) were systematically investigated. Pseudo-second-order kinetic and Langmuir equations well fitted the sorption kinetics and isotherms, respectively. Thermodynamics analyses revealed the spontaneous and endothermic sorption of these two contaminants. PCS exhibited high sorption capacity of 1649.30 mg·g MO and 200.46 mg·g Cr(VI) at 308 K. The superior sorption performance of PCS over MO is ascribed to ion exchange, intermolecular hydrogen bond, and electrostatic and π-π interactions, while sorption of PCS over Cr(VI) is mainly driven by electrostatic forces, reduction and ion exchange. Moreover, the PCSexceeded 95 % of its original capacities during five cycles. This high sorption capacities and high reusability make PCS an excellent sorbent candidate towards anionic contaminants.
一种高产率的吡啶功能化壳聚糖（PCS）可通过壳聚糖与 N-2,4-二硝基苯-吡啶氯化物的反应，简便地在溶剂热条件下获得。采用多种技术对 PCS 的形态和物理化学性质进行了测试。系统研究了其对甲基橙（MO）和 Cr(VI)的吸附行为。吸附动力学和吸附等温线分别很好地符合准二级动力学和朗缪尔方程。热力学分析表明，这两种污染物的吸附是自发和吸热的。在 308 K 时，PCS 对 MO 和 Cr(VI)的最大吸附容量分别为 1649.30 mg·g 和 200.46 mg·g。PCS 对 MO 的吸附性能优于 MO，这归因于离子交换、分子间氢键、静电和π-π相互作用，而 PCS 对 Cr(VI)的吸附主要受静电力、还原和离子交换的驱动。此外，PCS 在五个循环中超过了其原始容量的 95%。这种高吸附容量和高可重复使用性使 PCS 成为阴离子污染物的理想吸附剂。
