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RETRACTED: Adsorption of Eu(III) on sulfonated graphene oxide: Combined macroscopic and modeling techniques
- Source :
- Journal of Molecular Liquids. 215:443-448
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The sulfonated graphene oxide (GO-OSO 3 H) was synthesized by the oxidation of GO under concentrated H 2 SO 4 conditions. It is demonstrated based on characterization results that sulfonated groups was satisfactorily grafted on the surface of GO. Macroscopic investigation indicated that the adsorption of Eu(III) on GO-OSO 3 H can be better fitted by pseudo-second-order kinetic model with high correlation coefficient (R 2 > 0.999) compared to pseudo-first-order kinetic model (R 2 3 H was independent of ionic strength, revealing that inner-sphere surface complexation dominated the Eu(III) adsorption at pH from 2.0 to 11.0. The maximum adsorption capacity of GO-OSO 3 H for Eu(III) calculated from Langmuir model was 125.0 mg/g at pH 5.5 and T = 293 K conditions. The calculation of thermodynamic parameters showed that the adsorption of Eu(III) on GO-OSO 3 H was an exothermal and spontaneous processes. According to fitting of surface complexation modeling, the adsorption of Eu(III) on GO-OSO 3 H can be satisfactorily simulated by diffuse layer model with monodentate and mononuclear complexes (SOEu 2 + species) and bidentate and mononuclear complexes ((SO) 2 Eu (OH) 3 − species) at pH 2.0–11.0 conditions.
- Subjects :
- Denticity
Inorganic chemistry
Oxide
02 engineering and technology
010501 environmental sciences
01 natural sciences
law.invention
chemistry.chemical_compound
symbols.namesake
Adsorption
law
Materials Chemistry
Physical and Theoretical Chemistry
Spectroscopy
0105 earth and related environmental sciences
Kinetic model
Graphene
Chemistry
Langmuir adsorption model
Surface complexation
021001 nanoscience & nanotechnology
Condensed Matter Physics
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Ionic strength
symbols
0210 nano-technology
Subjects
Details
- ISSN :
- 01677322
- Volume :
- 215
- Database :
- OpenAIRE
- Journal :
- Journal of Molecular Liquids
- Accession number :
- edsair.doi...........088f38236947991729b49b70c5a34da9