Octahedral Molecular Sieve Manganese Oxide: Feasible Material for Hg(II) Remediation

Abstract:

Manganese-oxide material prepared by simple sol-gel method was used as an adsorbent of Hg(II) in aqueous solution. X-ray diffraction pattern and Raman spectroscopy were conducted to prove the cryptomelane crystal. The Hg(II) adsorption behavior of the synthesized material well obeyed kinetic models of pseudo-second-order and Elovich equations indicating a chemisorption from the collected kinetic parameters. 500 mg_Hg2+/g_cryptomelane of equilibrium uptake capacity from pseudo-second-order and 7.87x10³ mg_Hg2+/g_cryptomelane/day of initial adsorption rate from the Elovich model were obtained for adsorption of Hg²⁺ cation over cryptomelane adsorbent. Desorption constant of 0.018 g_cryptomelane/mg_Hg is a significant small value, in comparison to initial adsorption rate, proposing a possible chemisorption for remediation of Hg(II) on cryptomelane structure.

• Periodical: Advances in Science and Technology (Volume 122)
• Pages: 35-40
• DOI: https://doi.org/10.4028/p-03m8d0
• Online since: January 2023
• Authors: Tuyet Mai Tran Thuy*, Dung Van Nguyen
• Keywords: Environmental Treatment, Manganese Oxide, Mercury Removal, Molecular Sieve, OMS-2

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