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Synthesis and adsorption performance of a modified micro-mesoporous MIL-101(Cr) for VOCs removal at ambient conditions

Shafiei, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cej.2018.02.027
  3. Publisher: Elsevier B.V , 2018
  4. Abstract:
  5. In this study, dynamic adsorption behavior of different gaseous volatile organic compounds (VOCs) on a new modified M-MIL-101(Cr) was investigated with a great emphasis on gasoline adsorption. The M-MIL-101(Cr) was synthesized, along with comprehensive purification procedures, using a new linker to cluster molar ratio (2:1 instead of 1:1) and different modulators (i.e. HF and HNO3). All prepared adsorbents were characterized by XRD, FTIR, FE-SEM and N2 adsorption-desorption at 77 K. The results showed that surface area and pore volume of the M-MIL-101@Free (i.e. modified MIL-101(Cr) with using any modulator) which were 4293 m2/g and 2.43 cm3/g, greatly elevated up to 37.2% and 71.6% against the MIL-101@HNO3 (i.e. the best case of usual MIL-101(Cr)). The dynamic adsorption behavior of various VOCs (i.e. gasoline, n-pentane, n-hexane, n-heptane, benzene, toluene and xylenes), dispersed into an air stream at atmospheric conditions, was studied using an in-house made apparatus. The M-MIL-101@Free greatly exhibited high adsorption capacity for all selected VOCs which was approximately 1.9–2.5 times more than MIL-101@HNO3. Furthermore, the M-MIL-101@Free possessed maximum gasoline uptake of 90.14 wt%, which was enhanced by 116% (41.7 wt%) and 260% (25 wt%), compared to MIL-101@HNO3 and commercially activated carbon. Besides the prominent adsorption capacity of M-MIL-101@Free, it was also succeeded to be regenerated in 23.5% shorter time, 7.8% lower temperature and 2.1% higher efficiency versus the MIL-101@HNO3 after 4 cycles. © 2018 Elsevier B.V
  6. Keywords:
  7. Gasoline vapor recovery ; High surface area ; Modified MIL-101(Cr) ; MOF ; VOCs removal ; Activated carbon ; Gasoline ; Heptane ; Hexane ; Metalorganic frameworks ; Modulators ; Paraffins ; Volatile organic compounds ; Adsorption performance ; Dynamic adsorption behaviors ; Gasoline vapors ; High adsorption capacity ; Purification procedures ; Adsorption
  8. Source: Chemical Engineering Journal ; Volume 341 , 1 June , 2018 , Pages 164-174 ; 13858947 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S1385894718302201