In
this study, sodium carboxymethyl cellulose/poly(acrylic acid)
(CMC/PAA) microgels were successfully synthesized via visible-light-triggered
free-radical polymerization to remove methylene blue (MB) from water.
The microgels had a loose and porous 3-D network structure, exhibiting
excellent adsorption performance. The equilibrium adsorption capacity
and the removal efficiency of the microgels reached approximately
1479 mg/g and 97%, respectively, when the initial concentration of
MB was 300 mg/L. The adsorption kinetics was well described by the
pseudo-second-order model, and the adsorption isotherms followed the
Langmuir isothermal model. Notably, CMC/PAA microgels could naturally
settle and be separated from the MB solution. Furthermore, the recovery
efficiency of the regenerated CMC/PAA microgels reached approximately
94% after five adsorption–desorption cycles. Therefore, the
microgels could be used as promising adsorbents due to the advantages
of high adsorption capacity, fast removal rate, and reusability.
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