Comparative evaluation of MIL-101(Cr)/calcium alginate composite beads as potential adsorbents for removing water vapor from air

Mojtaba Askarieh, Hajar Farshidi, Alimorad Rashidi, Alimohammad Pourreza, Masood S. Alivand

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Recently, MIL-101(Cr) as a porous coordination polymer is of great interest in water adsorption due to its water stability and excellent water uptake capacity. However, its microcrystalline nature puts limitations on its practical applications. Therefore, achieving an efficient method to produce the desired shaped forms while preserving the intrinsic properties of the powder has been a challenge. In this study, the MIL-101(Cr) powder material was produced in >300 g quantities with an overall yield of around 65% and an average SBET = 3101 m2 g−1 and it was shaped into spherical beads with mean size of 2.1 ± 0.2 mm by using sodium alginate and calcium chloride solution through an ionotropic gelation technique. The water vapor adsorption and the breakthrough behavior of prepared adsorbent were investigated in comparison with commercial adsorbents. In addition, hydrothermal stability, optimized regeneration temperature and mechanical strength of the adsorbent beads were examined. The results showed that at 25 °C and 1 bar the shaped adsorbent affording of water uptake of 1.1 g/g at 75% relative humidity, which is 290, 250 and 350 % more than activated alumina, 13X and 3A molecular sieves, respectively. Furthermore, it showed a breakthrough time as high as that for activated alumina and 3A molecular sieve. The complete regeneration was achieved at as low as 80 °C and the adsorbent showed stable performance after 20 consecutive water adsorption/desorption cycles. The outcome of this study suggests the high potential of the ionotropic gelation to shape MIL-101(Cr) powder material into bead form and use in water adsorption applications.

Original languageEnglish
Article number120830
Number of pages10
JournalSeparation and Purification Technology
Volume291
DOIs
Publication statusPublished - 15 Jun 2022
Externally publishedYes

Keywords

  • Breakthrough curve
  • Calcium alginate
  • Composite bead
  • MIL-101(Cr)
  • Water vapor adsorption

Cite this