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- Title
A novel in-situ synthesis of magnetic graphene nanocomposites by Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> intercalation for removal of congo red from water: adsorption investigation and mechanism insights.
- Authors
Xue, Zhishuang; Deng, Xinzhong; Liang, Hai; Chen, Qiuyang; Zhao, Jie; Lv, Guanlin; Zuo, Xiuyuan; Du, Guofeng; Yu, Sansan
- Abstract
A novel magnetic graphene nanocomposites (MGN) was fabricated via a environment-friendly electrochemical exfoliation in Fe2(SO4)3 aqueous solutions. Ferrous sulfate in the electrolyte had the potential to enhance both the exfoliation efficiency of graphite and the in-situ magnetization of graphene. The as-obtained MGN-700 °C was explored as an adsorbent for the removal of Congo red (CR) from aqueous solutions. The adsorption equilibrium was rapidly achieved in 20 min, and the kinetic adsorption was well fitted with the pseudo-second-order kinetic model. Meanwhile, the adsorption isotherms followed the Freundlich model with a maximum capability of 582 mg g−1 for CR. Moreover, thermodynamic study indicated that the adsorption process was spontaneous and exothermic. Characterizations of the adsorbent suggested that the adsorption mechanisms of CR onto MGN-700 °C mainly involved hydrogen bond, electrostatic interaction and π–π stacking. After five cycles of adsorption/desorption, the removal efficiency of CR onto MGN-700 °Cremained at approximately 80%, demonstrating its excellent reusability. Furthermore, the adsorbent exhibited high adsorption capacity and a ferromagnetic feature, indicating its potential practical application in dye wastewater treatment.
- Subjects
CONGO red (Staining dye); GRAPHENE synthesis; FREUNDLICH isotherm equation; ADSORPTION (Chemistry); NANOCOMPOSITE materials
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 19, p8235
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09691-5