Mercury is one of the most toxic pollutant for humanities, the removal of Hg (II) from aqueous solutions shows great significance. With α-lipoic acid (ALA) as modulator in the synthesis, S-functionalized magnetic metal organic frameworks-808 (MMOF-808-S) was developed for selectively Hg (II) adsorption. Under the optimized synthesis conditions (molar ratio of 600: 1: 900 for ALA: trimesic acid (HBTC): formic acid (FA), mass ratio of 1: 2 for magnetic core/Zr salt), MMOF-808-S with high specific surface area of 625 m g and high content of S (6.3%) was obtained. The performance of resultant sorbent was evaluated which exhibited high adsorption capacity (322 mg g) and fast adsorption kinetics (4.3 × 10 g mg min) with good selectivity. Besides, MMOF-808-S can be regenerated by using eluent consisting of 0.5 mol L nitric acid and 1% thiourea, and the adsorption performance hardly varied after 5 cycles of adsorption/desorption. After mixing MMOF-808-S with aqueous solution, the residual content of Hg (II) was found to be below 2 μg L when its original concentration was 0.1 mg L. The modulated synthesis was demonstrated to be a good alternative for the functionalization of MOFs with simple operation and high efficiency. The obtained MMOF-808-S exhibited great potential in Hg (II) removal from complex water samples.

中文翻译：

---

用于去除 Hg (II) 的 S-功能化磁性金属有机框架-808 的调制合成

汞是对人类毒性最强的污染物之一，从水溶液中去除Hg(II)具有重要意义。以α-硫辛酸（ALA）作为合成调节剂，开发了S-功能化磁性金属有机骨架材料-808（MMOF-808-S），用于选择性吸附Hg（II）。在优化的合成条件下（ALA：均苯三酸（HBTC）：甲酸（FA）摩尔比为600：1：900，磁芯/Zr盐质量比为1：2），MMOF-808-S具有较高的合成效率。获得了625 m g的比表面积和高S含量（6.3%）。对所得吸附剂的性能进行了评估，其表现出高吸附容量（322 mg g）和快速吸附动力学（4.3 × 10 g mg min）以及良好的选择性。此外，MMOF-808-S可以使用0.5 mol·L硝酸和1%硫脲组成的洗脱液进行再生，并且在吸附/解吸5次循环后吸附性能几乎没有变化。将MMOF-808-S与水溶液混合后，当其原始浓度为0.1 mg·L-1时，发现Hg(II)的残留含量低于2μg·L-1。调制合成被证明是功能化的良好替代方案。 MOFs操作简单，效率高。获得的 MMOF-808-S 在复杂水样中去除 Hg (II) 方面表现出巨大的潜力。