期刊
WATER AIR AND SOIL POLLUTION
卷 228, 期 8, 页码 -出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11270-017-3482-6
关键词
Magnetic nanoparticles; Chitosan; Modification; Tripolyphosphate; Adsorption Cu(II)
资金
- National Natural Science Foundation of China [21367016, 51104073, 51408282]
- Science Research Fund in Yunnan Province Department of Education [2015 J028]
- Key Fund Project of Yunnan Provincial Department of Education [2015Z044]
A magnetic chitosan-modified Fe3O4@SiO2 with sodium tripolyphosphate adsorbent (MTPCS) was synthesized by surface modification of Fe3O4@SiO2 with chitosan using sodium tripolyphosphate (STPP) as the cross-linker in buffer solution for the adsorption of Cu(II) ions from aqueous solution. The structure and morphology of this magnetic nanoadsorbent were examined by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), BET surface area measurements, Fourier transform infrared spectrometer (FTIR), and X-ray photoelectron spectroscopy (XPS). The effects of initial pH, adsorbent amount, and initial concentration of heavy metal ions were investigated by batch experiments. Moreover, adsorption isotherms, kinetics, and thermodynamics were studied to understand the mechanism of adsorbing metal ions by synthesized MTPCS. The results revealed that adsorption kinetics was best depicted by the pseudo-second-order rate mode and intraparticle-diffusion models. The adsorption isotherm fitted well to the Langmuir model. Moreover, thermodynamic study verified the adsorption process was endothermic and spontaneous in nature. The maximum adsorption occurred at pH 5 +/- 0.1, and the adsorbent could be used as a reusable adsorbent with convenient conditions.
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