Efficient and selective removal of Pb2+ from aqueous solution by using an O− functionalized metal–organic framework,Dalton Transactions

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Efficient and selective removal of Pb2+ from aqueous solution by using an O− functionalized metal–organic framework
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-07 , DOI: 10.1039/d2dt01117d
Wen Jiang ₁ , Cai-Xia Yu ₁ , Ming-Xuan Yu ₁ , Jing Ding ₁ , Jian-Guo Song ₁ , Xue-Qin Sun ₁ , Lei-Lei Liu ₁

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Lead (Pb) is one of the most widespread and highly toxic heavy metals in the environment. The design and synthesis of adsorbent materials for the selective and efficient removal of Pb²⁺ from aqueous solution has received much attention. Herein, the ligand 4,4′-azoxydibenzoic acid with the O⁻ group was elaborately selected to construct a novel Pr-based MOF for Pb²⁺ removal. The as-prepared MOF adsorbents with high stability exhibited ultra-high selectivity for Pb²⁺, even in the presence of various highly concentrated competitive ions (with the ratios from 1 : 5 to 1 : 50). Also, a high uptake capacity (560.26 mg g⁻¹) can be achieved for the MOF material, due to the availability of sufficient adsorption sites. The strong electrostatic attraction and coordination interaction between the numerous active O⁻ sites on MOF adsorbents and Pb²⁺ can account for the good adsorption performance for Pb²⁺, which was systematically verified by zeta potential, FT-IR and XPS studies.

中文翻译：

使用 O- 功能化金属有机骨架高效选择性地去除水溶液中的 Pb2+

铅 (Pb) 是环境中分布最广、毒性最强的重金属之一。用于选择性、高效去除水溶液中Pb ²⁺的吸附材料的设计与合成备受关注。^{在此，精心选择具有O -}基团的配体4,4'-偶氮二苯甲酸构建了一种新型的用于去除Pb ²⁺的Pr基MOF 。^{所制备的具有高稳定性的MOF吸附剂对Pb 2+}表现出超高的选择性，即使存在各种高浓度竞争离子（比例为1:5至1:50）。此外，高吸收能力（560.26 mg g ^-1) 由于有足够的吸附位点，MOF 材料可以实现。MOF吸附剂上众多活性O ^-位点与Pb²⁺之间的强静电吸引和配位相互作用可以解释Pb 2+ 的良好吸附性能^，这已通过zeta电位、FT-IR和XPS研究得到系统验证。

更新日期：2022-06-07

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