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Preparation of a Sepiolite/Cu-Bdc Nanocomposite and Its Application As an Adsorbent in Respirator Cartridges for H2s Removal Publisher



Kakaei H1 ; Beygzadeh M2 ; Golbabaei F3 ; Ganjali MR4 ; Jahangiri M5 ; Shahtaheri SJ3, 6
Authors
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Authors Affiliations
  1. 1. Department of Occupational Health Engineering, School of Public Health, Ilam University of Medical Sciences, Ilam, Iran
  2. 2. Department of Energy, Materials and Energy Research Center, P.O. Box, 14155-4777, Tehran, Iran
  3. 3. Department of Occupational Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Electrochemistry Department, Faculty of Chemistry, College of Science, University of Tehran, Tehran, Iran
  5. 5. Department of Occupational Health Engineering, School of Public Health, Shiraz University of Medical Sciences, Shiraz, Iran
  6. 6. Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran

Source: New Journal of Chemistry Published:2019


Abstract

A newly developed Cu-BDC MOF nanocomposite based on natural sepiolite (Sep) was prepared and characterized using XRD, SEM, EDS, BET, and FTIR techniques. The surface areas of the sepiolite and the Sep/Cu-BDC nanocomposite were obtained as 105.5 m2 g-1 and 270.5 m2 g-1 with average micropore volumes of 0.39 and 0.32 cm3 g-1, respectively. The Sep/Cu-BDC nanocomposite was prepared from the Cu-BDC metal-organic framework with values of 10, 25, and 40% by weight. The synthesized nanocomposite was tested to estimate the adsorption capacity and breakthrough time under various temperature, humidity, and concentration conditions using a designed setup. The aeroqual S500 direct-reading sensor with 0.01 ppm accuracy was used to measure the exact amount of hydrogen sulfide gas (H2S). The produced Sep/Cu-BDC nanocomposites had an extremely high adsorption capacity compared to the primary sepiolite. Among the different adsorbents, the Sep/Cu-BDC (25 wt%) nanocomposite exhibited the highest adsorption capacity of 55.13 mg g-1 (SD = 0.70) and breakthrough time of 46.32 min (SD = 1.53), respectively. Also, the amount of adsorption and breakthrough time of H2S were decreased with increasing moisture and concentration. The pressure drop was also increased slightly. The nanocomposite with 40 wt% of Cu-BDC showed a significant decrease in the adsorption capacity and breakthrough time of H2S. The Sep/Cu-BDC adsorbent was regenerated using thermal regeneration at 190 °C in N2 flow for 4 h, and the results showed that the adsorbent could be used for three consecutive cycles exhibiting excellent recyclability and thermal stability. © 2019 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.