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Removal of mercury and methylene blue from aqueous solution by xanthate functionalized magnetic graphene oxide: Sorption kinetic and uptake mechanism
- Source :
- Journal of Colloid and Interface Science. 439:112-120
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- Xanthate functionalized magnetic graphene oxide (Fe3O4-xGO) was successfully synthesized through linking xanthate groups to a kind of graphenes magnetic material (Fe3O4-GS). Fe3O4-xGO was found to be an ideal adsorbent for Hg(II) and methylene blue removal with a higher adsorption capacity. The synthesized adsorbent was characterized by SEM, TEM, FTIR, XRD, and BET respectively. Fe3O4-xGO can be simply recovered from water with magnetic separation at low magnetic field within only 1min. The adsorption capacity was found to be 118.55mg g(-1) for Hg(2+) (contact time for 180min, pH at 7 and temperature at 25°C) and 526.32mg g(-1) for methylene blue (contact time for 120min, pH at 5.5 and temperature at 25°C), respectively. Kinetic data showed good correlation with pseudo-second-order equation and the Langmuir model was found to fit for the isotherm data, which showed the contaminant sorption was accomplished mainly via chelation or ion exchange. The results of thermodynamic studies (ΔG0, ΔH0, ΔS0) illustrate that the adsorption process was endothermic and spontaneous in nature. The experimental results suggest that Fe3O4-xGO has the potential applications in the environmental management.
- Subjects :
- Aqueous solution
Ion exchange
Inorganic chemistry
Oxide
Langmuir adsorption model
Sorption
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Biomaterials
symbols.namesake
chemistry.chemical_compound
Colloid and Surface Chemistry
Adsorption
chemistry
symbols
Xanthate
Methylene blue
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 439
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....a8290487ce00d87fa5a2d99048e8d010