Effective adsorption of mercury by Zr(IV)-based metal-organic frameworks of UiO-66-NH2 from aqueous solution

In this study, Zr-based metal-organic frameworks (MOFs) of UiO-66 and UiO-66-NH 2 were synthesized and applied to removal of mercury from aqueous solution. The characterizations of UiO-66 and UiO-66-NH 2 were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimet...

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Bibliographic Details
Published in:Environmental science and pollution research international 2021-02, Vol.28 (6), p.7068-7075
Main Authors: Zhao, Yufeng, Wang, Dongfang, Wei, Wei, Cui, Longzhe, Cho, Chul-Woong, Wu, Guiping
Format: Article
Language:English
Subjects:
Adsorption
Aquatic Pollution
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Fourier analysis
Fourier transforms
Functional groups
Infrared analysis
Infrared spectroscopy
Mercury
Mercury (metal)
Mercury surface
Metal-organic frameworks
Photoelectron spectroscopy
Photoelectrons
Research Article
Scanning electron microscopy
Sodium chloride
Spectrum analysis
Thermogravimetric analysis
Waste Water Technology
Water Management
Water Pollution Control
X ray photoelectron spectroscopy
X-ray diffraction
Zirconium
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Summary:In this study, Zr-based metal-organic frameworks (MOFs) of UiO-66 and UiO-66-NH 2 were synthesized and applied to removal of mercury from aqueous solution. The characterizations of UiO-66 and UiO-66-NH 2 were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TGA). To investigate the adsorption properties of UiO-66-NH 2 for mercury, the experiments of kinetics, isotherm, pH, temperature, and salt concentration were conducted, and the results were compared with those by UiO-66. The result showed that UiO-66-NH 2 has a higher adsorption capacity for mercury than UiO-66. The maximum adsorption capacity of UiO-66-NH 2 was 223.8 ± 17.8 mg g −1 at 313 K. The salt concentration of NaCl has a significant effect on the adsorption of mercury on UiO-66, while UiO-66-NH 2 can maintain the stable adsorption capacity for mercury in the concentration range of 0.1–0.5 M NaCl. Adsorption thermodynamics result indicated that the adsorption process of mercury on UiO-66-NH 2 was spontaneous and endothermic. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses showed that the mercury was successfully adsorbed on the surface of UiO-66-NH 2 and amino functional group as a soft base played a major role to react with mercury during the adsorption process. Graphical abstract
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-020-11080-9