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Highly efficient and selective Hg(II) removal from water by thiol-functionalized MOF-808: Kinetic and mechanism study
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2021-10-13 , DOI: 10.1016/j.cej.2021.132960
Chenghan Ji 1 , Yi Ren 1 , Hang Yu 1 , Ming Hua 1 , Lu Lv 1, 2 , Weiming Zhang 1, 2, 3
Affiliation  

Mercury pollution poses a serious threat to the ecological environment and public health due to its high toxicity and persistence, but there is still a lack of rapid and effective Hg(II) removal technology, especially emergency response of Hg(II) leakage. Herein, an effective metal-organic framework adsorbent, MOF-808-SH, was fabricated by grafting thioglycollic acid on MOF-808 for Hg(II) removal. The MOF-808-SH demonstrated high adsorption capacity of 977.5 mg/g, impressively ultrafast adsorption kinetics (C0 = 10 mg/L, removal > 99 % in 10 s) with a rate constant k of 36.89 g mg−1 min−1, which is dozens of times faster than that of ever reported Hg(II) adsorbents. Batch experiments show that MOF-808-SH exhibits high selectivity toward Hg(II) with a distribution coefficient Kd as high as 5.0×106 mL/g. Moreover, MOF-808-SH exhibits excellent recyclability with a negligible loss of capacity after 6 adsorption-regeneration cycles. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectrometry (XPS) unveil that the –SH groups in MOF-808-SH are the key adsorption sites, and specific inner-sphere coordination with Hg(II) is responsible for the high selectivity. In addition, large surface area, well-developed porous structures and high –SH loading of MOF-808-SH reasonably explains ultrafast kinetics and high adsorption capacity for Hg(II). This study indicates the potential of MOF-808-SH to remove Hg(II) from wastewater.



中文翻译:

巯基功能化 MOF-808 从水中高效选择性去除 Hg(II):动力学和机理研究

汞污染由于其高毒性和持久性,对生态环境和公众健康构成严重威胁,但目前仍缺乏快速有效的去除汞(II)技术,尤其是对汞(II)泄漏的应急响应。在此,一种有效的金属有机骨架吸附剂 MOF-808-SH 通过在 MOF-808 上接枝巯基乙酸来去除 Hg(II) 制备。MOF-808-SH 表现出 977.5 mg/g 的高吸附容量,令人印象深刻的超快吸附动力学(C 0  = 10 mg/L,10 秒内去除率 > 99 %),速率常数 k 为 36.89 g mg -1 min - 1,这比以往报道的 Hg(II) 吸附剂快几十倍。批量实验表明MOF-808-SH对Hg(II)表现出高选择性,分配系数K d高达5.0×10 6毫升/克。此外,MOF-808-SH 表现出优异的可回收性,在 6 次吸附-再生循环后容量损失可以忽略不计。傅里叶变换红外光谱 (FTIR) 和 X 射线光电子能谱 (XPS) 揭示 MOF-808-SH 中的 –SH 基团是关键的吸附位点,与 Hg(II) 的特定内球配位负责高选择性。此外,MOF-808-SH 的大表面积、发达的多孔结构和高–SH 负载合理地解释了超快动力学和 Hg(II) 的高吸附能力。该研究表明 MOF-808-SH 从废水中去除 Hg(II) 的潜力。

更新日期:2021-10-20
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