Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 319, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2020.114161
Keywords
Magnetic material; Modified polyacrylamide; Crosslink reaction; Cationic dyes removal; Adsorption mechanism
Funding
- National Natural Science Foundation of China [21677020]
- Chongqing Science and Technology Commission [cstc2018jszx-cyzd0053]
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In order to deal with the increasingly serious water pollution caused by dye wastewater, a novel sulfonic acid-modified polyacrylamide magnetic composite (Fe3O4@SiO2/P(AM-AMPS)) was facilely prepared by crosslink reaction. The physicochemical properties and adsorption performances of Fe3O4@SiO2/P(AM-AMPS) were systematically studied by different characterization techniques and a series of batch experiments, respectively. It was found that the adsorption capacities of Fe3O4@SiO2/P(AM-AMPS) towards cationic dyes crystal violet (CV) and methylene blue (MB) were largely enhanced than those of silica-coated Fe3O4(Fe3O4@SiO2) and maintained at relatively high levels in a wide pH range, due to the three-dimensional network structure and abundant functional groups of modified polyacrylamide. Besides, owing to the introduction of Fe3O4@SiO2, Fe3O4@SiO2/P(AM-AMPS) presented a unique magnetic property that helped it to be rapidly separated from water in a magnetic field. The maximum adsorption capacities of Fe3O4@SiO2/P(AM-AMPS) were 2106.37 mg g(-1) for CV removal and 1462.34 mg g(-1) for MB removal at 298.15 K, much higher than those of other reported magnetic composites. Furthermore, Fe3O4@SiO2/P (AM-AMPS) was effectively regenerated with HCI solution and the regeneration rates were higher than 97% and 80% for CV and MB removal after five adsorption-desorption cycles, respectively. With its excellent adsorption capacity, wide pH applicability, high separation speed, and satisfactory regeneration ability, Fe3O4@SiO2/P(AM-AMPS) was expected to become a promising adsorbent in the purification of cationic dye wastewater. (C) 2020 Elsevier B.V. All rights reserved.
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