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Efficient removal of Hg2+ from aqueous solution by a novel composite of nano humboldtine decorated almandine (NHDA): Ion exchange, reducing-oxidation and adsorption

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 ki...

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Published in:Journal of hazardous materials 2021-02, Vol.404, p.124035, Article 124035
Main Authors: Zeng, Qiang, Hu, Liang, Zhong, Hui, He, Zhiguo, Sun, Wei, Xiong, Daoling
Format: Article
Language:English
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Summary: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. [Display omitted] •A novel composite of NHDA could efficiently remove Hg2+ from solution.•The maximum Hg2+ adsorption capacity was 575.17 mg/g.•The removal mechanisms were ion exchange, surface complexation, reducing-oxidation.•Hg2+ removal processes and mechanisms were different for different pH values.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2020.124035