Influence of the solvent in the synthesis of zeolitic imidazolate framework-8 (ZIF-8) nanocrystals at room temperature

Bustamante, Eugenia L.; Fernández, José Luis Fernández; Zamaro, Juan Manuel

doi:10.1016/j.jcis.2014.03.014

Cited by 251 publications

(153 citation statements)

References 35 publications

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“…Also, the absorption band at around 3430 cm -1 ascribed to -OH groups of ZIF-8. The characteristic peaks of prepared ZIF-8 is assent with the reported data [42][43][44]. Distinctive bands of APTES at 1087 cm -1 is assigned to the stretching mode of the Si-O bond which is appeared on the modified ZIF-8 ( Fig.…”

Section: Characterization Of Materialssupporting

confidence: 84%

Synthesis of amine-modified zeolitic imidazolate framework-8, ultrasound-assisted dye removal and modeling

Abdi

Vossoughi

Mahmoodi

et al. 2017

Ultrasonics Sonochemistry

131

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The present research is focused on the ultrasound assisted adsorption of Acid blue 92 (AB92) and Direct red 80 (DR80) as anionic dyes in single and binary systems onto zeolitic imidazolate framework (ZIF-8) functionalized with 3-Aminopropyltrimethoxysilane (APTES). Different techniques such as Fourier transform infrared (FTIR), scanning electron microscope (SEM), field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and thermogravimetric analyses (TGA) were used to characterize the prepared adsorbent. The individual effects and possible interactions between the various parameters including adsorbent dosage, sonication time, initial dye concentrations and pH on dyes removal efficiency were investigated by response surface methodology (RSM). The optimized experimental conditions were fixed at adsorbent dosage 0.005g for AB92 and 0.01g for DR80, pH 2.1, sonication time 15min, and initial dyes concentration 15mgL to get maximum removal percentage (>95.0%). A reliable and intelligent model based on least-squares support vector machine (LS-SVM) was developed to predict dye removal efficiency. The root mean square error (RMSE) of 0.604, 0.734 and 1.549 with high determination coefficient (R) of 0.999, 0.996 and 0.997 for AB92, DR80 and binary system, respectively, were able to predict and model the adsorption process. The presented model illustrates better performance in predicting dye removal efficiency compared to the kinetic models. The results showed that the adsorption process had better conformation with pseudo-second order model. The adsorption equilibrium data was investigated by Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models and the data were well fitted by Langmuir model with maximum adsorption capacity of 633.4 and 500.2mgg for AB92 and DR80 dyes, respectively. APTES@ZIF-8 was regenerated and found to be reusable after four successive cycles without considerable loss in adsorption capacity.

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Section: Characterization Of Materialssupporting

confidence: 84%

Synthesis of amine-modified zeolitic imidazolate framework-8, ultrasound-assisted dye removal and modeling

Abdi

Vossoughi

Mahmoodi

et al. 2017

Ultrasonics Sonochemistry

131

View full text Add to dashboard Cite

show abstract

“…10 μm), some differences in morphology are observed with sample prepared by route A exhibiting a plate-like shape while longer prisms were achieved by route B. This difference in the aspect may be attributed to the different medium (water and ethanol/ water respectively) used in the synthesis [39][40][41][42][43]. Indeed, the use of alcohols such as methanol, ethanol, 2-propanol and glycols modify the properties of the reaction medium (dielectric constant, inter ionic attraction, solubility), which have an influence in the crystal growth habit and lead to different crystal shapes and in some cases even to different polymorphs [44,45].…”

Section: Resultsmentioning

confidence: 99%

Study of sodium manganese fluorides as positive electrodes for Na-ion batteries

et al. 2015

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“…43 DMF, aside from regulating etching by modulating pH, may also be responsible for inhibiting ZIF growth as has been reported in some solvothermal ZIF-8 syntheses. 44 Finally, we considered whether differences in microwave absorption might affect the energy available to the system. However, since water and DMF have similar loss tangent values, both solvents can be expected to behave similarly under microwave radiation.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

Sub-micron Polymer–Zeolitic Imidazolate Framework Layered Hybrids via Controlled Chemical Transformation of Naked ZnO Nanocrystal Films

Meckler¹,

Li²,

Queen

et al. 2015

Chem. Mater.

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Here we show that sub-micron coatings of zeolitic imidazolate frameworks (ZIFs) and even ZIF−ZIF bilayers can be grown directly on polymers of intrinsic microporosity from zinc oxide (ZnO) nanocrystal precursor films, yielding a new class of all-microporous layered hybrids. The ZnO-to-ZIF chemical transformation proceeded in less than 30 min under microwave conditions using a solution of the imidazole ligand in N,N-dimethylformamide (DMF), water, or mixtures thereof. By varying the ratio of DMF to water, it was possible to control the morphology of the ZIFon-polymer from isolated crystallites to continuous films. Grazing incidence X-ray diffraction was used to confirm the presence of crystalline ZIF in the thin films, and X-ray absorption spectroscopy was used to quantify film purity, revealing films with little to no residual ZnO. The role solvent plays in the transformation mechanism is discussed in light of these findings, which suggest the ZnO nanocrystals may be necessary to localize heterogeneous nucleation of the ZIF to the polymer surface.

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Influence of the solvent in the synthesis of zeolitic imidazolate framework-8 (ZIF-8) nanocrystals at room temperature

Cited by 251 publications

References 35 publications

Synthesis of amine-modified zeolitic imidazolate framework-8, ultrasound-assisted dye removal and modeling

Synthesis of amine-modified zeolitic imidazolate framework-8, ultrasound-assisted dye removal and modeling

Study of sodium manganese fluorides as positive electrodes for Na-ion batteries

Sub-micron Polymer–Zeolitic Imidazolate Framework Layered Hybrids via Controlled Chemical Transformation of Naked ZnO Nanocrystal Films

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