Publication: Efficient mercury removal at ultralow metal concentrations by cysteine functionalized carbon-coated magnetite
Issued Date
2020-11-02
Resource Type
ISSN
20763417
Other identifier(s)
2-s2.0-85096389610
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Applied Sciences (Switzerland). Vol.10, No.22 (2020), 1-18
Suggested Citation
Assadawoot Srikhaow, Teera Butburee, Weeraphat Pon-On, Toemsak Srikhirin, Kanchana Uraisin, Komkrit Suttiponpanit, Suwilai Chaveanghong, Siwaporn Meejoo Smith Efficient mercury removal at ultralow metal concentrations by cysteine functionalized carbon-coated magnetite. Applied Sciences (Switzerland). Vol.10, No.22 (2020), 1-18. doi:10.3390/app10228262 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/60430
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Efficient mercury removal at ultralow metal concentrations by cysteine functionalized carbon-coated magnetite
Abstract
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This work reports the preparation and utility of cysteine-functionalized carbon-coated Fe3 O4 materials (Cys-C@Fe3 O4) as efficient sorbents for remediation of Hg(II)-contaminated water. Efficient removal (90%) of Hg(II) from 1000 ppb aqueous solutions is possible, at very low Cys-C@Fe3 O4 sorbent loadings (0.01 g sorbent per liter of Hg(II) solution). At low metal concentrations (5–100 ppb Hg(II)), where adsorption is typically slow, Hg(II) removal efficiencies of 94–99.4% were achievable, resulting in final Hg(II) levels of <1.0 ppb. From adsorption isotherms, the Hg(II) adsorption capacity for Cys-C@Fe3 O4 is 94.33 mg g−1, around three times that of carbon-coated Fe3 O4 material. The highest partition coefficient (PC) of 2312.5 mgg−1 µM−1 was achieved at the initial Hg (II) concentration of 100 ppb, while significantly high PC values of 300 mgg−1 µM−1 and above were also obtained in the ultralow concentration range (≤20 ppb). Cys-C@Fe3 O4 exhibits excellent selectivity for Hg(II) when tested in the presence of Pb(II), Ni(II), and Cu(II) ions, is easily separable from aqueous media by application of an external magnet, and can be regenerated for three subsequent uses without compromising Hg(II) uptake. Derived from commercially available raw materials, it is highly possible to achieve large-scale production of the functional sorbent for practical applications.