Selective and adsorptive removal of anionic dyes and CO2 with azolium-based metal-organic frameworks
Selective and adsorptive removal of anionic dyes and CO2 with azolium-based metal-organic frameworks
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使用唑鎓基金属有机骨架选择性吸附去除阴离子染料和 CO2
DOI：
10.1016/j.jcis.2018.02.003
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发表时间：
2018-06-01
影响因子：
9.9
通讯作者：
Verpoort, Francis
中科院分区：
文献类型：
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作者：
Ezugwu, Chizoba I.;Asraf, Md. Ali;Verpoort, Francis
带正电的偶氮基团使咪唑连接体成为构建阳离子金属有机框架的理想连接体，因为配体在框架中诱导了阳离子环境。因此，我们采用两种咪唑配体1,3-二（4-羧基苯基）咪唑氯（H2L+CI-）和1,3-二（3,5-二羧基）咪唑氯（H4L+CI-）合成了两种镍基氮基mof， 1和2。采用PXRD、TGA、FE-SEM、HR-TEM、FTIR和BET等测试手段对合成的mof进行了表征。将1和2应用于染料带电分子的液相吸附，成功地吸附了水溶液中阴离子染料甲基橙（MO）、刚果红（CR）和橙二钠盐（OS）。该框架在阴离子染料的光催化降解中被证明是有效的。此外，在气相吸附中，由于CO2的四极矩较高，1和2选择性地吸附CO2而不是CH4。总体而言，研究结果表明，氮基mof在吸附去除水中和气体环境中的带电有机污染物方面具有潜在的应用前景。(C) 2018爱思唯尔公司版权所有。
The positively charged azolium moieties make imidazolium linker an ideal linker for the construction of cationic metal-organic frameworks because the ligand induces cationic environments in the frameworks. Therefore, we employed two imidazolium ligands, 1,3-bis(4-carboxyphenyl)imidazolium chloride (H2L+CI-) and 1,3-bis(3,5-dicarboxyphenyl)imidazolium chloride (H4L+CI-), to synthesize two nickel azolium-based MOFs, 1 and 2. The as-synthesis MOFs were characterized by PXRD, TGA, FE-SEM, HR-TEM, FTIR and BET measurements. By applying 1 and 2 in liquid phase adsorption of charged molecules of dyes, they successfully exhibit remarkable efficiency for adsorptive removal of anionic dyes, Methyl orange (MO), Congo red (CR), and Orange II sodium salt (OS), from aqueous solution. The framework proves efficient in photocatalytic degradation of anionic dye. Furthermore, in the gaseous phase adsorption, 1 and 2 selectively adsorb CO2 over CH4 due to the higher quadrupole moment of CO2. Overall, the results show that azolium-based MOFs have potential applications for adsorptive removal of charged organic contaminants from both aqueous and gaseous environment. (C) 2018 Elsevier Inc. All rights reserved.