Synthesis, Characterization and n-Hexane Adsorption Performance of ZIF-8†

doi:10.7503/cjcu20160263

Abstract

Abstract:

The zeolitic imidazolate framework ZIF-8 was synthesized through a solvothermal process employing methanol as the solvent, zinc nitrate hexahydrate and 2-methylimidazole as zinc source and organic ligand, respectively. The products were characterized by means of XRD, N₂ adsorption, TG-DSC and SEM. In addition, selective adsorption performance for n-hexane on ZIF-8 was investigated. It is indicated that synthesized ZIF-8 has the sodalite crystal structure and a high crystallinity. From the N₂ adsorption results, ZIF-8 product has a pore size range of 0.4—1.1 nm, BET specific surface area of 1836 m²/g and pore volume of 0.65 cm³/g. Both TG-DSC and high-temperature in situ XRD analyses suggest its excellent thermal stability. As the temperature increases from 283 to 313 K, the diffusion coefficient for n-hexane adsorption on ZIF-8 varies from 2.53×10^-12 to 8.88×10^-12 cm²/s and diffusion activation energy is evaluated to be 31.11 kJ/mol. At 308 K, the dynamic adsorption capacity and Thomas adsorption rate constant for n-hexane on ZIF-8 are 187.3 mg/g and 2.17×10^-3 mL·min^-1·mg^-1, respectively. As compared to 5A molecule sieve, ZIF-8 displays around 100% higher adsorption capacity and almost 70% faster diffusion rate.

Key words: ZIF-8, n-Hexane, Adsorption kinetics, Adsorption capacity, Dynamic adsorption

CLC Number:

O647

TrendMD:

LIU Kefeng, REN Danni, SUN Hui, SHEN Benxian, LIU Jichang. Synthesis, Characterization and n-Hexane Adsorption Performance of ZIF-8^†[J]. Chem. J. Chinese Universities, 2016, 37(10): 1856.

Figures/Tables 7

Fig.1 Experimental and simulated XRD patterns of ZIF-8a. Simulated pattern; b. experimental pattern;c. high-temperature in situ sample.

Fig.2 N2 adsorption-desorption isotherms(A) and micropore size distribution(B) of ZIF-8

Fig.3 SEM images of ZIF-8 with different magnifications

Fig.4 TG-DSC curves of ZIF-8

Fig.5 Adsorption rate curves of n-hexane on ZIF-8Qt/Qm: adsorption equilibrium approaching degree. The solid lines represent fitting results.

Table 1 Kinetics parameters for adsorption of n-hexane on ZIF-8

Temperature/K	10⁴D· $r - 2$ /s^-1	10¹²D/(cm²·s^-1)
283	1.12	2.53
298	2.91	6.55
313	3.95	8.88

Table 1 Kinetics parameters for adsorption of n-hexane on ZIF-8

Temperature/K	10⁴D· $r - 2$ /s^-1	10¹²D/(cm²·s^-1)
283	1.12	2.53
298	2.91	6.55
313	3.95	8.88

Fig.6 Adsorption breakthrough curve of n-hexane on a fixed bed filled with ZIF-8The solid line represents fitting breakthrough curve.

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