Nadiia V. Roik , Lyudmila O. Belyakova , Mykola V. Ischenko , Peter Švec , Oleksandr S. Roik
{"title":"Synthesis, hydrolytic stability, and phase transformation of (Co, Co/Zn, Zn)-ZIFs with cuboid morphology of particles","authors":"Nadiia V. Roik , Lyudmila O. Belyakova , Mykola V. Ischenko , Peter Švec , Oleksandr S. Roik","doi":"10.1016/j.micromeso.2024.113186","DOIUrl":null,"url":null,"abstract":"<div><p>A simple, cost-effective, and environmentally friendly strategy was proposed for synthesis of three types of zeolitic imidazolate frameworks (Co, Co/Zn, and Zn based/containing) with cuboid particle morphology. The structure of (Co, Co/Zn, Zn)-ZIFs was studied by scanning electron microscopy, x-ray diffraction, and low-temperature nitrogen adsorption-desorption. To obtain information about the possibility of potential liquid-phase application of the cuboid (Co, Co/Zn, Zn)-ZIFs, hydrolytic stability testing was carried out at ambient conditions. According to the results of flame atomic absorption spectroscopy of supernatant solutions and x-ray diffraction analysis of solid samples, the negligibly small cleavage of Co–N and especially Zn–N bonds takes place during the first day of experiment with no discernible influence on the structure integrity of the studied ZIF mateials. Long-term water exposure of Co-containing ZIF materials results in transition of metal cations into the solution and noticeable transformation of crystalline structure. The effectiveness of the synthesized (Co, Co/Zn, Zn)-ZIFs in sorption of methyl orange from aqueous solutions was studied in dependence on duration of contact and equilibrium concentration of azo dye. Obtained results were analyzed by kinetic (Lagergren and Ho-McKay) and equilibrium (Langmuir, Freundlich, and Dubinin–Radushkevich) adsorption models. It was found that the kinetics of methyl orange sorption by synthesized ZIF sorbents is best described with the Ho-McKay model. The equilibrium sorption on Co-ZIF and Zn-ZIF with cuboid particle morphology proceeds in accordance with the Langmuir model, whereas interaction with heterometallic Co/Zn-ZIF agrees with the Freundlich one. The mean free adsorption energy for sorption of azo dye by ZIF materials increases in the order Zn-ZIF < Co/Zn-ZIF < Co-ZIF. The x-ray diffraction studies of (Co, Co/Zn, Zn)-ZIF materials after methyl orange sorption proved the complete transformation of mixed ZIF-L/ZIF-67 phase of cuboid Co-ZIF to rhombic dodecahedral ZIF-67.</p></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":null,"pages":null},"PeriodicalIF":4.8000,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous and Mesoporous Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387181124002087","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
A simple, cost-effective, and environmentally friendly strategy was proposed for synthesis of three types of zeolitic imidazolate frameworks (Co, Co/Zn, and Zn based/containing) with cuboid particle morphology. The structure of (Co, Co/Zn, Zn)-ZIFs was studied by scanning electron microscopy, x-ray diffraction, and low-temperature nitrogen adsorption-desorption. To obtain information about the possibility of potential liquid-phase application of the cuboid (Co, Co/Zn, Zn)-ZIFs, hydrolytic stability testing was carried out at ambient conditions. According to the results of flame atomic absorption spectroscopy of supernatant solutions and x-ray diffraction analysis of solid samples, the negligibly small cleavage of Co–N and especially Zn–N bonds takes place during the first day of experiment with no discernible influence on the structure integrity of the studied ZIF mateials. Long-term water exposure of Co-containing ZIF materials results in transition of metal cations into the solution and noticeable transformation of crystalline structure. The effectiveness of the synthesized (Co, Co/Zn, Zn)-ZIFs in sorption of methyl orange from aqueous solutions was studied in dependence on duration of contact and equilibrium concentration of azo dye. Obtained results were analyzed by kinetic (Lagergren and Ho-McKay) and equilibrium (Langmuir, Freundlich, and Dubinin–Radushkevich) adsorption models. It was found that the kinetics of methyl orange sorption by synthesized ZIF sorbents is best described with the Ho-McKay model. The equilibrium sorption on Co-ZIF and Zn-ZIF with cuboid particle morphology proceeds in accordance with the Langmuir model, whereas interaction with heterometallic Co/Zn-ZIF agrees with the Freundlich one. The mean free adsorption energy for sorption of azo dye by ZIF materials increases in the order Zn-ZIF < Co/Zn-ZIF < Co-ZIF. The x-ray diffraction studies of (Co, Co/Zn, Zn)-ZIF materials after methyl orange sorption proved the complete transformation of mixed ZIF-L/ZIF-67 phase of cuboid Co-ZIF to rhombic dodecahedral ZIF-67.
期刊介绍:
Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal.
Topics which are particularly of interest include:
All aspects of natural microporous and mesoporous solids
The synthesis of crystalline or amorphous porous materials
The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic
The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions
All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials
Adsorption (and other separation techniques) using microporous or mesoporous adsorbents
Catalysis by microporous and mesoporous materials
Host/guest interactions
Theoretical chemistry and modelling of host/guest interactions
All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.