期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 255, 期 -, 页码 7-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.07.037
关键词
Cr (VI) removal; RGO/NiO nanocomposites; Adsorption; Langmuir; Mechanism
类别
资金
- National Natural Science Foundation of China [21277142]
- Cross-disciplinary Collaborative Teams Program for Science, Technology and Innovation of Chinese Academy of Sciences
- Hundred Talents Project of the Chinese Academy of Science
- Important Deployment Project of Chinese Academy of Sciences [KZZD-EW-TZ-16]
- CAS Interdisciplinary Innovation Team
- 135 Breading Project of Chinese Academy of Sciences (Northeast Institute of Geography and Agro-ecology) [Y6H2081001]
In this work, we report a room-temperature approach to synthesizing reduced graphene oxidei/NiO (RGO/NiO) nanocomposites. The chemical structure of RGO/NiO nanocomposites were investigated by Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray power diffraction (XRD). It is shown by the experiment that the RGO/NiO nanocomposites have strong capacity to absorb the hexavalent chromium ion (Cr (VI)), the maximum adsorption capacity of Cr (VI) on RGO/NiO nanocomposites at pH = 4 and T = 25 degrees C can reach 198 mg g(-1), higher than any other currently reported. The adsorption kinetic data were well described by a pseudo-second-order model. Both Freundlich and Langmuir isotherm models were applied to the experimental data analysis, and the latter proved to be a better fit. The pH value markedly affected the adsorption behavior of RGO/NiO nano composites, but the effect of temperature was insignificant. The probable mechanism of synergistic adsorption of Cr (VI) ions was considered. These results suggest that RGO/NiO nanocomposites have the potential to be applied in industrial wastewater treatment. (C) 2017 Elsevier Inc. All rights reserved.
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