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用于从水溶液中去除Pb(ii)和亚甲基蓝的新型乙二胺四乙酸-壳聚糖/海藻酸盐多孔复合珠

Novel EDTA-chitosan/alginate porous composite beads for the removal of Pb(ii) and methylene blue from aqueous solutions.

作者信息

Liu Xueling, Ren Wenjie, Song Weilin, Zhang Wanqiang, Wang Yuhan, Wang Yi, Fan Guozhi, Zhang Lei, Huang Yanjun

机构信息

School of Chemistry and Environmental Engineering, Wuhan Polytechnic University Wuhan 430023 PR China

出版信息

RSC Adv. 2025 Apr 28;15(17):13728-13743. doi: 10.1039/d5ra00940e. eCollection 2025 Apr 22.

DOI:10.1039/d5ra00940e
PMID:40297006
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12036652/
Abstract

Wastewater containing heavy metals and organic dye pollutants discharged into receiving waters poses a serious environmental concern. Herein, a novel EDTA-chitosan/alginate porous composite bead adsorbent (EC-AB) was reported for the simultaneous removal of lead (Pb(ii)) and methyl blue (MB) complexes from wastewater. Characterization results showed that EC-AB contained plenty of oxygen/nitrogen functional groups. The effect of CaCO addition, pH of the initial solution, contact time, initial pollutant concentration, and ionic strength on EC-AB pollutant removal performance and the adsorption mechanism were systematically analyzed. These findings indicated that EC-AB exhibited high removal efficiency over a wide pH range and at high ionic strength. The maximum adsorption capacities of EC-AB for Pb(ii) and MB were 504.11 mg g and 660.76 mg g, respectively, at 298 K. Adsorption kinetics and isotherm studies indicated that the adsorption well fitted the pseudo-second-order kinetic model and the Langmuir isotherm. A possible adsorption mechanism involving electrostatic attraction, chelation, ion exchange, H-bonding and synergistic effects was proposed. Moreover, EC-AB showed superior stability and reusability, with removal efficiencies of 76.64% for Pb(ii) and 80.29% for MB after five continuous adsorption-desorption cycles for treating complex wastewater. In summary, this work provides a beneficial strategy for designing high-performance adsorbents for the treatment of wastewater.

摘要

排放到接收水体中的含有重金属和有机染料污染物的废水引起了严重的环境问题。在此，报道了一种新型的乙二胺四乙酸-壳聚糖/海藻酸钠多孔复合珠吸附剂（EC-AB），用于同时去除废水中的铅（Pb(ii)）和亚甲基蓝（MB）络合物。表征结果表明，EC-AB含有大量的氧/氮官能团。系统分析了碳酸钙添加量、初始溶液pH值、接触时间、初始污染物浓度和离子强度对EC-AB污染物去除性能的影响以及吸附机理。这些结果表明，EC-AB在较宽的pH范围内和高离子强度下表现出高去除效率。在298 K时，EC-AB对Pb(ii)和MB的最大吸附容量分别为504.11 mg/g和660.76 mg/g。吸附动力学和等温线研究表明，吸附很好地符合准二级动力学模型和朗缪尔等温线。提出了一种可能的吸附机理，涉及静电吸引、螯合、离子交换、氢键和协同效应。此外，EC-AB表现出优异的稳定性和可重复使用性，在处理复杂废水的五个连续吸附-解吸循环后，对Pb(ii)的去除效率为76.64%，对MB的去除效率为80.29%。总之，这项工作为设计用于处理废水的高性能吸附剂提供了有益的策略。

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