Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 404, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124035
Keywords
Hg2+ removal; Almandine; Humboldtine; Adsorption mechanisms
Categories
Funding
- National Natural Science Foundation of China [51774339]
- National Key Research & Development Project of China [2018YFC1900405]
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A novel composite of nano humboldtine decorated almandine was synthesized for efficient removal of Hg2+ from aqueous solution, with a maximum adsorption capacity of 575.17 mg/g. The removal process was pH-dependent, and lower pH values facilitated the removal of Hg2+. The composite showed great potential for Hg2+ removal and the transformation of mercury related species could be an important pathway in natural and engineered systems.
Efficient removal of Hg2+ from aqueous solution is key for environmental protection and human health. Herein, a novel composite of nano humboldtine decorated almandine was synthesized from almandine for the removal of Hg2+. Results showed that the Hg2+ removal process followed pseudo-second-order kinetic model and Langmuir equation, and the maximum adsorption capacity was 575.17 mg/g. Furthermore, Hg2+ removal by the composite was pH-dependent and low pH value facilitated the removal of Hg2+. SEM and HADDF-STEM results suggested a new rod morphology was generated and the adsorbed mercury was mainly enriched into this structure after reaction with Hg2+ solution. The removal mechanisms of Hg2+ by the composite was pH dependent, and included ion exchange, surface complexation, reduction and oxidation. Our results demonstrated that the composite was an ideal material for Hg2+ removal and the transformation ways of mercury related species could be a significant but currently underestimated pathway in natural and engineered systems.
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