Preparation of amidoxime modified covalent organic framework for efficient adsorption of lead ions in aqueous solution

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL Chemical Engineering Journal Pub Date : 2024-05-16 DOI:10.1016/j.cej.2024.152292

Dawei Xiang , Rong Zhu , Yuefeng Chen , Manying Zhu , Shixing Wang , Yihui Wu , Jiaxin Luo , Likang Fu

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Abstract

Lead ion is one of the most common heavy metal contaminants for human health. Therefore, it is necessary to develop the efficient and selective adsorbents to remove lead ions in wastewater. Here, an amidoximated covalent organic framework was designed as adsorbent (COF-NHOH) for the removal of lead ions from aqueous solutions. The adsorption properties were studied by batch adsorption. The adsorption process is quickly completed in just 30 min. The highest adsorption capacity of the COF-NHOH is 368.68 mg/g at 298 K, which is much higher than that of JUC-500. Kinetic, isotherm and thermodynamic results show that the adsorption process is a spontaneous monolayer chemical adsorption process. The adsorbent removes selectively lead ions from a complex multi-ion environment. Moreover, the adsorption ability of the adsorbent decreased by only 14.05 % after five cycle experiments. COF-NHOH exhibits excellent anti-interference ability and reusability. Finally, COF-NHOH achieves efficient removal of lead ions through chelation and electrostatic action based on DFT calculations and others. In conclusion, the adsorbent showed excellent application for the removal of lead ions from aqueous solutions.

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制备脒肟修饰共价有机框架以高效吸附水溶液中的铅离子

铅离子是影响人类健康的最常见重金属污染物之一。因此，有必要开发高效且具有选择性的吸附剂来去除废水中的铅离子。本文设计了一种氨基氧化共价有机框架（COF-NHOH）作为吸附剂，用于去除水溶液中的铅离子。通过批量吸附法研究了其吸附特性。吸附过程在 30 分钟内迅速完成。在 298 K 时，COF-NHOH 的最高吸附容量为 368.68 mg/g，远高于 JUC-500 的吸附容量。动力学、等温线和热力学结果表明，吸附过程是一个自发的单层化学吸附过程。该吸附剂可选择性地从复杂的多离子环境中去除铅离子。此外，经过五个循环实验后，吸附剂的吸附能力仅下降了 14.05%。COF-NHOH 具有出色的抗干扰能力和可重复使用性。最后，根据 DFT 计算等结果，COF-NHOH 通过螯合作用和静电作用实现了对铅离子的高效去除。总之，该吸附剂在去除水溶液中的铅离子方面具有极佳的应用前景。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.