Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 24, Issue 19, Pages 16520-16530Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-9213-0
Keywords
Magnetic chitosan beads; Porous structure; Heavy metal; Bioadsorbent
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Funding
- National Natural Science Foundation of China [51408074]
- Research Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection [SKLGP2015Z007, SKLGP2017Z009]
- Hong Kong Scholars Program [XJ2015005, G-YZ80]
- China Postdoctoral Science Foundation [2015T80966]
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This research focuses on the removal of heavy metal ions from aqueous solutions using magnetic chitosan hydrogel beads as a potential sorbent. Highly porous magnetic chitosan hydrogel (PMCH) beads were prepared by a combination of in situ co-precipitation and sodium citrate cross-linking. Fourier transform infrared spectroscopy indicated that the high sorption efficiency of metal cations is attributable to the hydroxyl, amino, and carboxyl groups in PMCH beads. Thermogravimetric analysis demonstrated that introducing Fe3O4 nanoparticles increases the thermal stability of the adsorbent. Laser confocal microscopy revealed highly uniform porous structure of the resultant PMCH beads, which contained a high moisture content (93%). Transmission electron microscopy micrographs showed that the Fe3O4 nanoparticles, with a mean diameter of 5 +/- 2 nm, were well dispersed inside the chitosan beads. Batch adsorption experiments and adsorption kinetic analysis revealed that the adsorption process obeys a pseudo-second-order model. Isotherm data were satisfactorily described by the Langmuir equation, and the maximum adsorption capacity of the adsorbent was 84.02 mg/g. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectra analyses were performed to confirm the adsorption of Pb2+ and to identify the adsorption mechanism.
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