Diamino-functionalized metal-organic framework for selective capture of gold ions

被引：5
作者：
Wu M. [1 ]
Tian H. [2 ]
Gao X. [3 ]
Cui X. [1 ]
Li Z. [2 ]
Li K. [2 ]
Zhao X. [1 ]
机构：
[1] College of Chemical Engineering and Technology, Taiyuan University of Science and Technology, Taiyuan
[2] Department of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang
[3] Instrumental Analysis Center, Taiyuan University of Science and Technology, Shanxi, Taiyuan
来源：
Chemosphere | 2024年 / 362卷
基金：
中国国家自然科学基金;
关键词：
Diamino groups; Gold ion; Metal-organic framework; Selective adsorption;
D O I：
10.1016/j.chemosphere.2024.142686
中图分类号：
学科分类号：
摘要：
Adsorptive recovery of valuable gold (Au) ions from wastes is vital but still challenged, especially regarding adsorption capacity and selectivity. A novel M − 3,5-DABA metal-organic framework (MOF) adsorbent was prepared via anchoring 3,5-diaminobenzoic acid (3,5-DABA) molecule in the MOF-808 matrix. Benefiting from the positive charge property, dense amino groups (3.2 mmol g−1) and high porosity, the adsorption capacity of M − 3,5-DABA reaches 1391.5 mg g−1 (pH = 2.5) and adsorption equilibrium is attained in 5 min. This amino-based material shows excellent selectivity towards various metal ions, evading the poor selectivity problem of classical thiol groups (e.g. for Ag+, Cu2+, Pb2+ and Hg2+ ions). In addition, the regeneration was easily achieved via using a hydrochloric acid-thiourea eluent. Experimental analysis and density functional theory (DFT) calculation show the amino group works as a reductant for Au(III) ions and meanwhile acts as an active site for adsorbing Au(III) ions together with the μ-OH group. Thus, M − 3,5-DABA can act as a potential adsorbent for Au(III) ions, and our work offers a viable strategy to construct novel MOF-based adsorbents. © 2024 Elsevier Ltd
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