Efficient Mercury Removal at Ultralow Metal Concentrations by Cysteine Functionalized Carbon-Coated Magnetite
| Autor: | Komkrit Suttiponpanit, Weeraphat Pon-On, Toemsak Srikhirin, Teera Butburee, Assadawoot Srikhaow, Siwaporn Meejoo Smith, Suwilai Chaveanghong, Kanchana Uraisin |
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| Rok vydání: | 2020 |
| Předmět: |
magnetite
mercury Sorbent chemistry.chemical_element 02 engineering and technology 010402 general chemistry lcsh:Technology 01 natural sciences lcsh:Chemistry Metal chemistry.chemical_compound Adsorption General Materials Science lcsh:QH301-705.5 Instrumentation surface functionalization Magnetite Fluid Flow and Transfer Processes Aqueous solution lcsh:T Chemistry Process Chemistry and Technology General Engineering 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Computer Science Applications Mercury (element) Partition coefficient lcsh:Biology (General) lcsh:QD1-999 adsorption lcsh:TA1-2040 visual_art visual_art.visual_art_medium lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology Selectivity lcsh:Physics Nuclear chemistry |
| Zdroj: | Applied Sciences, Vol 10, Iss 8262, p 8262 (2020) Applied Sciences Volume 10 Issue 22 |
| ISSN: | 2076-3417 |
| Popis: | This work reports the preparation and utility of cysteine-functionalized carbon-coated Fe3O4 materials (Cys-C@Fe3O4) 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@Fe3O4 sorbent loadings (0.01 g sorbent per liter of Hg(II) solution). At low metal concentrations (5&ndash 100 ppb Hg(II)), where adsorption is typically slow, Hg(II) removal efficiencies of 94&ndash 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@Fe3O4 is 94.33 mg g&minus 1, around three times that of carbon-coated Fe3O4 material. The highest partition coefficient (PC) of 2312.5 mgg&minus 1µ M&minus 1 was achieved at the initial Hg (II) concentration of 100 ppb, while significantly high PC values of 300 mgg&minus 1 and above were also obtained in the ultralow concentration range (&le 20 ppb). Cys-C@Fe3O4 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. |
| Databáze: | OpenAIRE |
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