A novel mesoporous Fe-silica aerogel composite with phenomenal adsorption capacity for malachite green

Ruihao Tang, Wei Hong, C. Srinivasakannan, Xuelin Liu, Xin Wang, Xinhui Duan

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Silica aerogel and Fe doped silica aerogel composite were synthesized by sol–gel method adopting ambient pressure drying method. The crystal structure, surface morphology, pore structure, surface functional groups and elemental composition of silica aerogel prepared with different concentrations of Fe3+ were characterized by XRD, SEM, TEM, BET, FTIR, XPS and Zeta potential analysis. The specific surface area of the composite aerogel was found to decrease with the increase addition amount of FeCl3. The optimal composite aerogel adsorbent had a surface area of 240 m2/g with well-developed mesoporous network, which possessed a maximum malachite green(MG) adsorption capacity of 1592 mg/g, as compared to virgin silica aerogel of 1250 mg/g. Adsorption capacity for large molecules like MG is very low for the most popular adsorbent such as high surface area activated carbon, which is usually the first-choice adsorbent for wastewater treatment. Such high adsorption capacitiy of the silica aerogel composite is highly promising as it is on the classification of low-cost adsorbents, which can serve to be far better alternative for waste water treatment applications.

Original languageBritish English
Article number119950
JournalSeparation and Purification Technology
Volume281
DOIs
StatePublished - 15 Jan 2022

Keywords

  • Adsorption mechanism
  • High adsorption capacity
  • Malachite green
  • Silica aerogel composite

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