Nadiia V. Roik , Lyudmila O. Belyakova , Mykola V. Ischenko , Peter Švec , Oleksandr S. Roik
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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":"{\"title\":\"Synthesis, hydrolytic stability, and phase transformation of (Co, Co/Zn, Zn)-ZIFs with cuboid morphology of particles\",\"authors\":\"Nadiia V. 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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. 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引用次数: 0
摘要
提出了一种简单、经济、环保的策略,用于合成三种具有立方体颗粒形态的唑基咪唑酸框架(钴、钴/锌和锌基/含锌)。通过扫描电子显微镜、X 射线衍射和低温氮吸附-解吸对(Co、Co/Zn、Zn)-ZIFs 的结构进行了研究。为了了解立方体(Co、Co/Zn、Zn)-ZIF 在液相应用中的可能性,在环境条件下进行了水解稳定性测试。根据上清液的火焰原子吸收光谱和固体样品的 X 射线衍射分析结果,在实验的第一天,Co-N(尤其是 Zn-N)键的裂解微乎其微,对所研究的 ZIF 材料的结构完整性没有明显影响。含 Co 的 ZIF 材料长期接触水会导致金属阳离子过渡到溶液中,晶体结构发生明显变化。研究了合成的(Co、Co/Zn、Zn)-ZIFs 从水溶液中吸附甲基橙的效果与接触时间和偶氮染料平衡浓度的关系。获得的结果通过动力学(Lagergren 和 Ho-McKay)和平衡(Langmuir、Freundlich 和 Dubin-Radushkevich)吸附模型进行了分析。研究发现,合成的 ZIF 吸附剂对甲基橙的吸附动力学用 Ho-McKay 模型描述得最好。具有立方体颗粒形态的 Co-ZIF 和 Zn-ZIF 上的平衡吸附符合 Langmuir 模型,而与异金属 Co/Zn-ZIF 的相互作用则符合 Freundlich 模型。ZIF 材料吸附偶氮染料的平均自由吸附能按照 Zn-ZIF < Co/Zn-ZIF < Co-ZIF 的顺序增加。对甲基橙吸附后的(Co、Co/Zn、Zn)-ZIF 材料进行的 X 射线衍射研究证明,立方体 Co-ZIF 的混合 ZIF-L/ZIF-67 相完全转变为菱形十二面体 ZIF-67。
Synthesis, hydrolytic stability, and phase transformation of (Co, Co/Zn, Zn)-ZIFs with cuboid morphology of particles
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.