期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 137, 期 -, 页码 741-750出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.06.244
关键词
Attapulgite; Aminopropyltriethoxysilane; Chitosan; Pb(II); Adsorption
资金
- National Natural Science Foundation of China [21476212]
- Science and Technology department of Zhejiang Province [2018C02038]
- Zhejiang Provincial Natural Science Foundation of China [LQ17C190002]
- Zhejiang Provincial Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals [2018002, 2018003]
- Bureau of Science and Technology of Zhoushan [2019C21023]
The performance of Fe3O4/attapulgite (APT) nanoparticles in Pb(II) adsorption from aqueous solutions could be improved by modifying the particles with aminopropyltriethoxysilane (APTS) and then combining with chitosan (CS) into beads. After preparing the APTS-Fe3O4/APT@CS beads, their surface morphology and crystal phases were analyzed by Fourier-transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction. The magnetic properties of APTS-Fe3O4/APT@CS were studied by a vibrating sample magnetometer, while their heat resistance and stability were characterized by thermal weight analysis. A recycling test and comparison of adsorption capacities were also carried out. The adsorption capacity of Fe3O4/APT was improved by the modification with APTS and CS. The adsorption process conforms to the pseudo-second-order kinetic and Langmuir adsorption isotherm models. The adsorption of Pb(II) reaches a maximum of 625.34 mg/g, which compares favorably with other reported adsorbents. The results show that APTS-Fe3O4/APT@CS is a promising hybrid adsorbent for effective removal of Pb(II) from water. (C) 2019 Elsevier B.V. All rights reserved.
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