Journal
POLYMER
Volume 213, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.123316
Keywords
Carboxymethyl chitosan; Polydopamine; Magnetic; Aerogel; Dyes removal
Categories
Funding
- Science and Technology Program of Guangzhou, China [202002030223]
- Zhaoqing Xijiang innovation team project, Guangdong, China
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A novel method combining mussel-inspired chemistry and Schiff base reaction was developed to remove dyes, resulting in a magnetic aerogel with excellent recyclability and removal efficiency after seven cycles. The designed aerogel is a simple, convenient, and environmentally friendly procedure.
A novel and facile method that magnetic carboxymethyl chitosan aerogel (Fe3O4@PDA/CMC) has been developed with the combination of mussel-inspired chemistry and Schiff base reaction to remove cation and anion dyes. The resulted aerogel were systematically characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), thermogravimetric analysis (TGA), N-2 adsorption-desorption, and point of zero charge (pH(pzc)). Diverse factors affecting adsorption behavior such as pH, contact time, adsorbent dosage, initial concentration, ionic strength of dyes was investigated. The kinetic results show that the adsorption process can be well described by the pseudo-second-order. The Langmuir isotherm model can fit the equilibrium data well. The thermodynamic analyses show that the adsorption of cation and anion dyes onto Fe3O4@PDA/CMC aerogel is endothermic and spontaneous. In this study, the obtained Fe3O4@PDA/CMC aerogel is a simple, facile and environmentally friendly procedure which involves non-toxic organic solvent. The designed magnetic aerogel exhibited an excellent recyclability and removal efficiency after seven adsorption-desorption cycles.
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