Abstract:
Degradable magnetic and CO
2 dual-responsive microgels were prepared by inverse suspension polymerization and
in-situ synthesis of nanoparticles. The structure and morphology of microgels were characterized by Fourier-transformed infrared (FT-IR) spectroscopy, scanning electron microscope (SEM) and transmission electron microscope (TEM). The microgels exhibited magnetic and CO
2 responsiveness, and could be degraded upon the treatment of
D,
L-dithiothreitol (DTT). After treating with the stimulus of CO
2, the microgels exhibited a selective adsorption for anionic dyes. The maximum adsorption capacity was up to 1413 mg/g for Alizarin red (AR). The microgels with adsorbates could be separated from solutions under the help of an external magnetic field. Besides, the adsorbates could be described by treating with solution of pH 12. Microgels regenerated with CO
2 trigger exhibited high adsorption ability (>90%) after three consecutive recycling trials.