Synthesis of highly porous inorganic adsorbents derived from metal-organic frameworks and their application in efficient elimination of mercury(II)
Synthesis of highly porous inorganic adsorbents derived from metal-organic frameworks and their application in efficient elimination of mercury(II)
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金属有机骨架高孔无机吸附剂的合成及其在高效脱汞中的应用(II)
DOI：
10.1016/j.jcis.2018.01.112
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发表时间：
2018
影响因子：
9.9
通讯作者：
Chen Changlun
中科院分区：
文献类型：
--
作者：
Li Jie;Li Xuede;Alsaedi Ahmed;Hayat Tasawar;Chen Changlun
高效提取水溶液中的汞（Hg（II））迫切需要新型固相吸附剂。本文中，高度多孔的无机材料，包括ZrOx，ZrOxyPhos和ZrSulf，通过简单的配体提取过程从金属-有机框架（MOF）的拓扑结构转化获得，其保留了原始的MOF形态并引入了有用的功能。ZrOx和ZrOxyPhos对Hg（II）具有很高的吸附效率。在所制备的三种无机材料中，ZrSulf由于具有可接近的硫基官能团，表现出最快的吸附动力学（1.1 × 10−2g/（mg min））和最高的吸附容量（824 mg/g），超过了大多数其他基准多孔吸附剂。此外，ZrSulf显示出良好的再生能力和优异的选择性，在共存的其他金属离子，如Cd（II），Ni（II），Co（II），Mn（II）和Zn（II），和其他无机阳离子，如K+和Na+的存在下，Hg（II）。ZrSulf对Hg（II）的优异吸附性能可归因于与基于硫的官能团结合与Na的离子交换形成共价键。由于其低成本和易于制备的性质，ZrSulf可能是从水介质中消除Hg（II）的潜在有价值的候选物。改变MOF模板和使用不同的消化溶液将引入不同的金属和结构的可能性，这证明了这种配体提取方法用于合成用于重金属离子去污的多孔无机吸附剂的潜力。
Innovative solid-phase adsorbent is needed urgently for highly efficient extraction of mercury (Hg(II)) from aqueous solution. Herein, highly porous inorganic materials, including ZrOx, ZrOxyPhos and ZrSulf, were obtained from topotactic transformations of metal–organic frameworks (MOFs) via a facile ligand extraction process, which preserved the original MOF morphology and introduced useful functionalities. ZrOx and ZrOxyPhos exhibited high adsorption efficiency for Hg(II). And ZrSulf showed fastest adsorption kinetics (1.1 × 10−2g/(mg min)) and highest adsorption capacity (824 mg/g) among the obtained three inorganic materials due to the presence of accessible sulfur-based functionality, which surpassed most of other benchmark porous adsorbents. Moreover, ZrSulf showed good regeneration ability and excellent selectivity for Hg(II) in the presence of other coexisting metal ions, such as Cd(II), Ni(II), Co(II), Mn(II) and Zn(II), and other inorganic cations, such as K+and Na+. The excellent adsorption performance of ZrSulf towards Hg(II) can be traceable to the covalent bond formation with sulfur-based functionality combined with ion exchange with Na. Given its low-cost and easy preparation nature, ZrSulf could be potentially valuable candidates for the elimination of Hg(II) from aqueous media. Changing the MOF templates and using different digest solutions will introduce different metal and structural possibilities, which demonstrates the potential of such ligand extraction method for synthesizing porous inorganic adsorbents for heavy metal ion decontamination.