논문 상세보기
One‑ and two‑dimensional carbon nanomaterials as adsorbents of cationic and anionic dyes from aqueous solutions KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/388797
One- and two-dimensional carbon nanomaterials were tested as adsorbents for the elimination of two anionic dyes, reactive red 2 and methyl orange, and the cationic dye methylene blue from aqueous solutions under the same conditions. Carbon nanomaterials performed well in the removal of dyes. Surface oxygenated groups in the nanomaterials improved the cationic dyes’ adsorption, but not the adsorption of the anionic dye. The interactions between nanomaterials and dyes were verified by infrared and Raman spectroscopy. The pseudo-second order kinetic model was better fitted to the kinetic experimental data than the Elovich and pseudo-first order models. The equilibrium adsorption data were best fitted by the Langmuir model. The dimensions and morphology of the carbon nanomaterials play an important role in the adsorption of the three dyes. The main mechanism of adsorption of anionic dyes is by the interactions of the aromatic rings of the dye structures and π delocalized electrons on carbon nanostructures; the adsorption of cationic dye is mainly due to electrostatic interactions.
Abstract
1 Introduction
2 Experimental
2.1 Materials
2.2 Functionalization of carbon nanotubes
2.3 Preparation of GO
2.4 Preparation of rGO
2.5 Characterization of carbon materials
2.6 Batch equilibrium experiments
2.7 Batch kinetic experiments
2.8 Kinetics models
2.9 Isotherm models
3 Results and discussion
3.1 Properties of carbon nanomaterials
3.2 Infrared spectroscopy
3.3 Raman spectroscopy
3.4 Effect of the contact time and initial concentration of dye on the cationic and anionic dyes adsorption
3.4.1 Reactive red 2 dye adsorption
3.4.2 Methyl orange dye adsorption
3.4.3 Methylene blue dye adsorption
3.5 Kinetic studies
3.6 Adsorption isotherms
4 Conclusions
Acknowledgements
References
