期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 319, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2020.114289
关键词
Anionic dyes; Carbon nanotubes; Adsorption performance; Kinetics; Isotherm; Thermodynamics
资金
- National Natural Science Foundation of China [51903215]
- Sichuan Province Sci-Tech Supported Project [2020YJ0168]
- Sichuan Youth Science and Technology Innovation Research Team Project [2020JDTD0018]
- China Postdoctoral Science Foundation [2019T120823]
It is a big challenge to design advanced adsorbents that have high adsorption capacity and excellent selectivity to efficiently remove organic dyes from complex environmental systems. Herein, by utilizing the adhesion property of polydopamine (PDA) and its crosslinking reaction with polyethyleneimine (PEI), a novel core/shell magnetic MWCNTs/Fe3O4@(PDA PEI) nano-hybrid that carries superior adsorption performance of dyes was constructed through facile polydopamine tailored graft polymerization. In such hierarchical structure, the inner shell of Fe3O4 nanoparticles and outer shell of (PDA + PEI) contributed to the abundant active adsorption sites, large specific surface area (126 m(2)/g) and high saturation magnetization value (10.91 emu/g). As a result, the prepared adsorbent exhibited highly selective adsorption performance toward multiple anionic dyes, including MB, CR, and MO with maximum adsorption capacity of 1449, 1006, and 935 mg/g at 298.15 K, respectively. It was found that the main adsorption mechanism was attributed to the hydrogen bonding and electrostatic interaction. The kinetics data fitted well with the pseudo-second-order model, and both the Langmuir and Freundlich isotherm models presented well fit to the isotherm data. The investigation of thermodynamic study indicated that the adsorption of anionic dyes onto core/shell magnetic MWCNTs/Fe3O4@(PDA + PEI) nano-hybrid was spontaneous and endothermic. More importantly, the adsorbent presented excellent regeneration property after multiple adsorption-desorption cycles and prominent stability in harsh environments, especially in the alkaline condition. Therefore, these results revealed the promising applications of hierarchical MWCNTs/Fe3O4@ (PDA - PEI) nano-hybrid in water remediation. (C) 2020 Elsevier B.V. All rights reserved.
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