Selective removal of mercury ions from aqueous solution by thiourea-functionalized porous aromatic framework

IF 9.8 1区工程技术 Q1 ENGINEERING, CHEMICAL Desalination Pub Date : 2025-05-15 Epub Date: 2025-02-13 DOI:10.1016/j.desal.2025.118696

Zi-Xuan Jin , He-Jie Lu , Xiang-Wen Chen , Yi-Hang Li , Si-Chao Zhu , Xiu-Lei Li , Zhi-Qian Jia , Yuexin Guo , Yu Yang , Li-An Hou

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Abstract

Mercury (Hg) is a significant biologically toxic water pollutant. Porous aromatic frameworks (PAFs) possess high surface area, open structure, and high stability under harsh conditions. In this paper, PAF-11 was modified with oxime and thiourea groups, and the as-obtained oximide functionalized PAF-11 (PAF-11-C=NOH) and thiourea functionalized PAF-11 (PAF-11-TU) were employed for adsorption of Hg²⁺ in solution for the first time. It was found that the adsorption capacity of PAF-11-TU was twice that of PAF-11-C=NOH, and exhibited a equilibrium capacity of 428 mg g⁻¹ for Hg²⁺. The adsorption of PAF-11-TU could be well fitted with the Langmuir and pseudo-second-order kinetics models, and displayed high anti-interference to co-existing metals, with a partial coefficient of 33,800 mL g⁻¹ for Hg²⁺, separation coefficients of 7935 and 3701 for Hg²⁺/Zn²⁺ and Hg²⁺/Cu²⁺ respectively. PAF-11-TU also showed good chemical stability and maintained removal rate of 91.62 % even after ten acid wash cycles. The excellent stability and preferential coordination of PAF-11-TU with Hg²⁺ indicate that PAF-11-TU is a suitable adsorbent for the removal of Hg²⁺ from water.

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硫脲功能化多孔芳香骨架对水溶液中汞离子的选择性去除

汞（Hg）是一种重要的生物毒性水污染物。多孔芳香骨架具有比表面积大、结构开放、在恶劣条件下具有较高的稳定性等特点。本文采用肟基和硫脲基对PAF-11进行改性，得到的酰亚胺官能化PAF-11 （PAF-11- c =NOH）和硫脲官能化PAF-11 （PAF-11- tu）首次用于吸附溶液中的Hg2+。结果表明，PAF-11-TU对Hg2+的吸附容量是PAF-11-C=NOH的2倍，对Hg2+的吸附平衡容量为428 mg g−1。PAF-11-TU的吸附符合Langmuir和拟二级动力学模型，对共存金属具有较强的抗干扰能力，对Hg2+的偏系数为33,800 mL g−1，对Hg2+/Zn2+和Hg2+/Cu2+的分离系数分别为7935和3701。PAF-11-TU具有良好的化学稳定性，即使经过10次酸洗也能保持91.62%的去除率。PAF-11-TU与Hg2+良好的配位性和稳定性表明PAF-11-TU是去除水中Hg2+的理想吸附剂。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.