Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 724, Issue -, Pages 625-632Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.07.095
Keywords
Metal-organic framework; Graphite oxide; Composite; Adsorption; Methyl orange
Categories
Funding
- National Natural Science Fund of China [U1401235]
- Science and Technology Planning Project of Guangdong Province, China [2016B020240005]
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An aluminum-based MOF/graphite oxide composite, MIL-68(Al)/GO, was synthesized and used to explore its adsorption performance toward methyl orange (MO). The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and N-2 adsorption-desorption. Compared to parent material, the composite possessed higher total pore volume and surface area. Meanwhile, a sandwich construction for the composite, with a preserved structure of MIL-68(Al) and GO, was also observed. Considering adsorption application, some key operating factors, adsorption isotherms, kinetics, mechanism, and regeneration were investigated. The adsorption isotherm conformed to the Langmuir isotherm model and the maximum equilibrium adsorption capacity was 400 mg/g. For kinetics, the process of adsorption was more suitably described by a pseudo-second-order model. Moreover, this material can be used over a wide pH range and exhibited superior adsorption performance and regenerability for the adsorption of MO. From these results, MIL-68(Al)/GO was suggested here to be a promising adsorbent for removing MO from aqueous solution. (C) 2017 Elsevier B.V. All rights reserved.
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