Recyclable Magnetic Iron Immobilized onto Chitosan with Bridging Cu Ion for the Enhanced Adsorption of Methyl Orange

Chitosan (CS) is a natural and low-cost adsorbent for capturing metal ions and organic compounds. However, the high solubility of CS in acidic solution would make it difficult to recycle the adsorbent from the liquid phase. In this study, the CS/Fe O was prepared via Fe O nanoparticles immobilized o...

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Published in:Molecules (Basel, Switzerland) Switzerland), 2023-03, Vol.28 (5), p.2307
Main Authors: Teng, Daoguang, Jin, Peng, Guo, Wenhuan, Liu, Jiang, Wang, Wei, Li, Peng, Cao, Yijun, Zhang, Ling, Zhang, Ying
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Azo compounds
bridging Cu
Chitosan
Composite materials
Dyes
Efficiency
Grain size
Iron oxides
Liquid phases
magnetic
Membrane separation
Metal ions
methyl orange
Nanoparticles
Organic compounds
Protein binding
Purification
Recyclability
recyclable adsorbent
Recycling
Sewage
Surface chemistry
Wastewater
Wastewater treatment
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Summary:Chitosan (CS) is a natural and low-cost adsorbent for capturing metal ions and organic compounds. However, the high solubility of CS in acidic solution would make it difficult to recycle the adsorbent from the liquid phase. In this study, the CS/Fe O was prepared via Fe O nanoparticles immobilized onto a CS surface, and the DCS/Fe O -Cu was further fabricated after surface modification and the adsorption of Cu ions. The meticulously tailored material displayed the sub-micron size of an agglomerated structure with numerous magnetic Fe O nanoparticles. During the adsorption of methyl orange (MO), the DCS/Fe O -Cu delivered a superior removal efficiency of 96.4% at 40 min, which is more than twice the removal efficiency of 38.7% for pristine CS/Fe O . At an initial MO concentration of 100 mg L , the DCS/Fe O -Cu exhibited the maximum adsorption capacity of 144.60 mg g . The experimental data were well explained by the pseudo-second-order model and Langmuir isotherm, suggesting the dominant monolayer adsorption. The composite adsorbent still maintained a large removal rate of 93.5% after five regeneration cycles. This work develops an effective strategy to simultaneously achieve high adsorption performance and convenient recyclability for wastewater treatment.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28052307