Effects of Post-Synthesis Activation and Relative Humidity on Adsorption Performance of ZIF-8 for Capturing Toluene from a Gas Phase in a Continuous Mode

Jafari, Saeed; Shahna, Farshid Ghorbani; Bahrami, Abdulrahman; Kazemian, Hossein

doi:10.3390/app8020310

Cited by 24 publications

(13 citation statements)

References 53 publications

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“…After coated with ZIF-8 ( Figure 3b), both peaks representing the FA and ZIF-8 could be found in the composite. New infrared diffraction peaks at 3136, 2930, 1584, 1426 cm −1 are feature peaks of imidazole, and the infrared diffraction peak at 500 cm −1 is the peak of Zn-O telescopic vibration, which is consistent with the earlier published papers [28,29]. Moreover, the band at 3444 cm −1 disappeared and C-H stretching vibration adsorption peak of methyl and imidazole ring appeared in 3136 and 2930 cm −1 [28], respectively.…”

Section: Ftir Analysissupporting

confidence: 88%

“…In addition, the peaks at 1350-1500 cm −1 belong to the entire ring stretching. The in-plane bending of the ring are found at 900-1350 cm −1 while those below 800 cm −1 are associated with the out-of-plane bending of the ring [29]. Considering the above analysis, the preparation mechanism of ZIF-8/FA composites can be explained by Figure 4…”

Section: Ftir Analysismentioning

confidence: 87%

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Synthesis of ZIF-8/Fly Ash Composite for Adsorption of Cu2+, Zn2+ and Ni2+ from Aqueous Solutions

2020

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In this study, fly ash (FA) coated with ZIF-8 (ZIF-8/FA) nanocomposite was first synthesized by taking 2-methylimidazole and zinc nitrate hexahydrate as reactants and then used as an adsorbent for adsorption of copper, zinc, and nickel ions from aqueous solution. The characteristic of FA and ZIF-8/FA samples were analyzed based on the data from scanning electronic microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, grain size analyzer and N2 adsorption-desorption isotherm. The results showed that ZIF-8 deposited on the FA evenly. The average crystallite size of ZIF-8 on the surface of FA is 15.85 nm. The specific surface area of FA was increased from 1.8 to 249.5 m2/g. The adsorption efficiency of the ZIF-8/FA nanocomposite for the removal of heavy metal ions from aqueous solution was optimized in terms of different parameters such as pH, adsorbent dosage, and contact time. It was shown that the saturated adsorption amounts of the obtained composite for adsorption of Cu2+, Zn2+, and Ni2+ are 335, 197, and 93 mg·g−1. ZIF-8/FA had better stability and more mesoporous volume than that of ZIF-8 and exhibited higher rate for adsorption of heavy metal ions from aqueous solution than FA and ZIF-8, suggesting an adsorption synergy between ZIF-8 and FA. The adsorption mechanism of heavy metal ions by ZIF-8/FA includes surface adsorption, pore adsorption, and ion exchange. The obtained ZIF-8/FA nanocomposite can solve the encountered problems of FA for low adsorption and the difficult recycling of ZIF-8 for their small size, high cost, and poor stability.

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Section: Ftir Analysissupporting

confidence: 88%

Section: Ftir Analysismentioning

confidence: 87%

Synthesis of ZIF-8/Fly Ash Composite for Adsorption of Cu2+, Zn2+ and Ni2+ from Aqueous Solutions

2020

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“…For ZIF-8, the IRRA spectrum, Figure 8b, shows a strong absorption band at 1587 cm −1 , assigned to the CN stretching. [15,[29][30][31] Further intense bands around 1300-1500 cm −1 overlap with the absorption bands of the stretching of imidazole rings. [32] The vibration bands are essentially constant and are not affected by exposing the sample to air.…”

Section: Vibrational Spectroscopy and Discussion Of Degradationmentioning

confidence: 92%

Stability and Degradation of Metal–Organic‐Framework Films under Ambient Air Explored by Uptake and Diffusion Experiments

Chun

Chandresh

Zhang

et al. 2021

Adv Materials Inter

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be tuned over a wide range using appropriate building blocks. [6] The MOF properties can be further adjusted by introducing functional groups into the structure or by post synthesis modification. [7][8] Although several chemically robust and water stable MOFs have been presented to date, [9][10] a severe drawback of many MOF structure is its limited stability, especially toward exposure to water. Since water vapor is often present in various industrial processes, it must be taken into account when selecting MOF adsorbents and the limited waterstability is a hindering factor for many applications. [11][12] In previous works, it was shown that water vapor can corrode the MOF surface, hindering the guest molecule transport through the MOF pores, also known as surface barrier for mass transfer. The existence of surface barriers greatly hinders the application and development of MOFs. [13][14][15] Here, we explore the mass transfer of a probe molecule (toluene) in MOF films of four popular structures: HKUST-1, ZIF-8, UiO-66, and UiO-67. HKUST stands for

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“…[5] Studies on ZIF-8 powders have found the materials are suitable adsorbents for several applications including vapor phase hydrocarbon capture [6][7][8] and liquid-phase contaminant extraction. [9,10] Due to the hydrophobicity of the 2-methylimidazole linker, ZIF-8 has been found to have low affinity toward water vapor, [6,11] making it particularly suitable for adsorption applications where humidity's competition for adsorption sites plays a key role, [12,13] such as indoor air cleaning of volatile organic compounds (VOCs). [14][15][16] ZIF-67 has been found to be unstable in liquid water, with a noted loss in crystallinity, [17] and water vapor isotherms of the material have not been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Sol–Gel Synthesis of High‐Density Zeolitic Imidazolate Framework Monoliths via Ligand Assisted Methods: Exceptional Porosity, Hydrophobicity, and Applications in Vapor Adsorption

Hunter‐Sellars¹,

Saenz‐Cavazos²,

Houghton³

et al. 2021

Adv Funct Materials

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Monolithic ZIF-8 and ZIF-67 adsorbents are synthesized at room temperature using a novel, ligand-assisted method. Despite reductions in crystallinity within some of the samples, monolithic zeolitic imidazolate frameworks (ZIFs) have superior volume-relative microporosity, total porosity, and surface areas relative to their particulate counterparts due to increased density. Samples synthesized using a single modulator, n-butylamine, have a hierarchical porosity resulting in improved adsorption capacities in mid-to high-sorbate pressure regions. ZIF-67 monoliths produced through mixedmodulator synthesis, n-butylamine and 1-methylimidazole, are almost entirely microporous. Vapor adsorption isotherms find that, whilst their amorphous content results in increased water uptake, monolithic ZIFs are found to possess higher surface and adsorption hydrophobicity than traditional nonpolar adsorbents. Cosorption measurements with a common VOC toluene, under humid conditions, find that these monolithic ZIF samples outperform powder equivalents, with the mixed-modulator ZIF-67 monolith capturing 28% more VOC compared to the powder ZIFs studied due to its superior volumetric efficiency. This study provides insights into the benefits of modulator-based tuning of porosity within monolithic ZIFs which, combined with their hydrophobicity, may facilitate their application for industrial organic vapor recovery or indoor air cleaning, where efficient hydrophobic adsorbents which can operate in humid environments are essential.

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Effects of Post-Synthesis Activation and Relative Humidity on Adsorption Performance of ZIF-8 for Capturing Toluene from a Gas Phase in a Continuous Mode

Cited by 24 publications

References 53 publications

Synthesis of ZIF-8/Fly Ash Composite for Adsorption of Cu2+, Zn2+ and Ni2+ from Aqueous Solutions

Synthesis of ZIF-8/Fly Ash Composite for Adsorption of Cu2+, Zn2+ and Ni2+ from Aqueous Solutions

Stability and Degradation of Metal–Organic‐Framework Films under Ambient Air Explored by Uptake and Diffusion Experiments

Sol–Gel Synthesis of High‐Density Zeolitic Imidazolate Framework Monoliths via Ligand Assisted Methods: Exceptional Porosity, Hydrophobicity, and Applications in Vapor Adsorption

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