Sepiolite as an efficient adsorbent for ethylene gas


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Erdogan B., Esenli R. F.

Clay Minerals, 2022 (Journal Indexed in SCI Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1180/clm.2021.36
  • Title of Journal : Clay Minerals
  • Keywords: Adsorption, B.E.T., Ethylene, Sepiolite, XRD

Abstract

© 2022 Cambridge University Press. All rights reserved.In this paper, the adsorption of ethylene on cation (Na+, Li+, K+, Ca2+ and Mg2+) exchanged and the acid-Activated sepiolite samples was studied for the usability of this low-cost mineral to remove ethylene from the storage environment. Sepiolite from Sivrihisar deposit (Turkey) was treated with 1.0 M NaNO3, LiNO3, KNO3, Ca(NO3)2, Mg(NO3)2, HNO3 and H2SO4 solutions at 90 oC for 4 h. XRD, XRF, CEC and nitrogen adsorption techniques were used to investigate the mineralogical, chemical and textural properties. XRD analyses demonstrated that the main mineral phase was sepiolite, with a minor amount of dolomite and traces of quartz and feldspar minerals and amorphous phase. Adsorption isotherms of ethylene at 273 K were measured on sepiolite samples over a pressure range of 0 100 kPa using volumetric apparatus. As a result of partial blockage of the channels, ethylene adsorption capacities of cation exchanged sepiolite forms (0.376-0.907 mmol g-1) were found to be lower than acid-Activated forms (1.279 and 1.308 mmol g-1). Ethylene adsorption capacities of these sepiolite samples (0.376-1.308 mmol g-1) were compared with already studied clay-based materials (0.167-1.817 mmol g-1) reported by other researchers for ethylene removal in terms of textural and structural differences.