Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange
The aim of this work was to synthesize zeolitic imidazolate framework-8 (ZIF-8) by an alternative method and then modify the surface properties for enhancing the CO<sub>2</sub> adsorption performance. The ZIF-8 was synthesized by a water based synthesis method using 2-methyl imidazole (2...
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doaj-9006fca46578458087897732a97c5d572020-11-25T02:36:56ZengMDPI AGCrystals2073-43522020-07-011059959910.3390/cryst10070599Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand ExchangeKasama Kenyotha0Kingkaew Chayakul Chanapattharapol1Sirirath McCloskey2Phongphan Jantaharn3Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, ThailandMaterials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, ThailandMaterials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, ThailandMaterials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, ThailandThe aim of this work was to synthesize zeolitic imidazolate framework-8 (ZIF-8) by an alternative method and then modify the surface properties for enhancing the CO<sub>2</sub> adsorption performance. The ZIF-8 was synthesized by a water based synthesis method using 2-methyl imidazole (2-MeIM) as a hydrogen bond donor and quaternary ammonium salts (QAS) as a hydrogen bond acceptor. The optimal synthesis conditions were investigated by varying (i) the order of precursor mixing during the synthesis process (ii) different QAS (tetrabutyl ammonium bromide (TBAB), tetraethyl ammonium bromide (TEAB) and trimethyl phenyl ammonium bromide (TMPAB)) and (iii) the ratio between 2-MeIM and QAS. The results show that the optimal synthesis condition was using TMPAB as the hydrogen bond acceptor with the ratio between 2-MeIM and TMPAB of 8:2 and in the order of first mixing both hydrogen bond donor and acceptor before adding Zn(NO<sub>3</sub>)<sub>2</sub>⋅6H<sub>2</sub>O solution. TMPAB can provide uniform size distribution with the smallest particle sizes of ZIF-8. This can be explained by the higher hydrogen bond strength between hydrogen bond donor (2-MeIM) and hydrogen bond acceptor (TMPAB) when compared with that of the rest of two QAS. The synthesized ZIF-8 was modified by solvent-assisted ligand exchange methods. The organic linker of ZIF-8 (2-MeIM) was exchanged by 2-aminobenzimidazole (2-NH<sub>2</sub>bZIM) and 2-phenylimidazole (2-PhIM). The CO<sub>2</sub> uptake of modified ZIF-8 was enhanced upon exchanging with 2-NH<sub>2</sub>bZIM. The increase in CO<sub>2</sub> uptake was due to an additional interaction between CO<sub>2</sub> and exchanged imidazole linker and an increase in surface properties (higher surface area, pore size and pore volume).https://www.mdpi.com/2073-4352/10/7/599CO<sub>2</sub> uptakeZIF-8water based synthesissolvent-assisted ligand exchange |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kasama Kenyotha Kingkaew Chayakul Chanapattharapol Sirirath McCloskey Phongphan Jantaharn |
spellingShingle |
Kasama Kenyotha Kingkaew Chayakul Chanapattharapol Sirirath McCloskey Phongphan Jantaharn Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange Crystals CO<sub>2</sub> uptake ZIF-8 water based synthesis solvent-assisted ligand exchange |
author_facet |
Kasama Kenyotha Kingkaew Chayakul Chanapattharapol Sirirath McCloskey Phongphan Jantaharn |
author_sort |
Kasama Kenyotha |
title |
Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange |
title_short |
Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange |
title_full |
Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange |
title_fullStr |
Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange |
title_full_unstemmed |
Water Based Synthesis of ZIF-8 Assisted by Hydrogen Bond Acceptors and Enhancement of CO<sub>2</sub> Uptake by Solvent Assisted Ligand Exchange |
title_sort |
water based synthesis of zif-8 assisted by hydrogen bond acceptors and enhancement of co<sub>2</sub> uptake by solvent assisted ligand exchange |
publisher |
MDPI AG |
series |
Crystals |
issn |
2073-4352 |
publishDate |
2020-07-01 |
description |
The aim of this work was to synthesize zeolitic imidazolate framework-8 (ZIF-8) by an alternative method and then modify the surface properties for enhancing the CO<sub>2</sub> adsorption performance. The ZIF-8 was synthesized by a water based synthesis method using 2-methyl imidazole (2-MeIM) as a hydrogen bond donor and quaternary ammonium salts (QAS) as a hydrogen bond acceptor. The optimal synthesis conditions were investigated by varying (i) the order of precursor mixing during the synthesis process (ii) different QAS (tetrabutyl ammonium bromide (TBAB), tetraethyl ammonium bromide (TEAB) and trimethyl phenyl ammonium bromide (TMPAB)) and (iii) the ratio between 2-MeIM and QAS. The results show that the optimal synthesis condition was using TMPAB as the hydrogen bond acceptor with the ratio between 2-MeIM and TMPAB of 8:2 and in the order of first mixing both hydrogen bond donor and acceptor before adding Zn(NO<sub>3</sub>)<sub>2</sub>⋅6H<sub>2</sub>O solution. TMPAB can provide uniform size distribution with the smallest particle sizes of ZIF-8. This can be explained by the higher hydrogen bond strength between hydrogen bond donor (2-MeIM) and hydrogen bond acceptor (TMPAB) when compared with that of the rest of two QAS. The synthesized ZIF-8 was modified by solvent-assisted ligand exchange methods. The organic linker of ZIF-8 (2-MeIM) was exchanged by 2-aminobenzimidazole (2-NH<sub>2</sub>bZIM) and 2-phenylimidazole (2-PhIM). The CO<sub>2</sub> uptake of modified ZIF-8 was enhanced upon exchanging with 2-NH<sub>2</sub>bZIM. The increase in CO<sub>2</sub> uptake was due to an additional interaction between CO<sub>2</sub> and exchanged imidazole linker and an increase in surface properties (higher surface area, pore size and pore volume). |
topic |
CO<sub>2</sub> uptake ZIF-8 water based synthesis solvent-assisted ligand exchange |
url |
https://www.mdpi.com/2073-4352/10/7/599 |
work_keys_str_mv |
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