Removal of low Sb(V) concentrations from mining wastewater using zeolitic imidazolate framework-8
Wastewater generated during mining remains a significant source of antimony pollution, because techniques to quickly and efficiently remove antimony from wastewater do not exist. In this study, zeolitic imidazolate framework-8 (ZIF-8), a specific type of Metal Organic Frameworks (MOFs), was successf...
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Published in: | Journal of environmental management Vol. 287; p. 112280 |
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Main Authors: | , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
England
Elsevier Ltd
01-06-2021
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Subjects: | |
Online Access: | Get full text |
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Summary: | Wastewater generated during mining remains a significant source of antimony pollution, because techniques to quickly and efficiently remove antimony from wastewater do not exist. In this study, zeolitic imidazolate framework-8 (ZIF-8), a specific type of Metal Organic Frameworks (MOFs), was successfully used to remove trace levels (1 mg L−1) of Sb(V) with a high removal efficiency when the ZIF-8 dose was 0.5 g L−1. Scanning electron microscopy-X-ray energy dispersive spectrometry (SEM-EDS) indicated that Sb(V) was adsorbed onto the ZIF-8surface. The powder X-ray diffraction (XRD) pattern of ZIF-8 before and after adsorption of Sb(V) indicated that ZIF-8 was successfully synthesized, and remained structurally stable after Sb(V) was adsorbed. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) both suggested complexation of zinc on ZIF-8 with Sb(V), where removal of Sb(V) by ZIF-8 followed the Langmuir adsorption isotherm with pseudo second-order kinetics. Thus, a possible removal mechanism was proposed which involved Sb(V) complexing with the zinc hydroxyl groups on ZIF-8 (Zn–OH–Sb). Practically, ZIF-8, could remove 78.6% of Sb(V) from a mining wastewater containing 20 μg L−1 Sb(V). Furthermore, ZIF-8 could be remain active after repeated uses and could still remove and 42.3% of Sb(V) from wastewater containing 1 mg L−1) Sb(V) even when the ZIF-8 was reused five time. This indicated that ZIF-8 had potential for practical removal of Sb(V) from mining wastewaters.
•ZIF-8 was successfully used to remove trace levels of Sb(V).•Main factors impacted on the removal efficiency of Sb(V) were given.•The removal mechanism based on the adsorption was proposed.•A 73.6% of Sb(V) with 20 μgL−1 from a mining wastewater was demonstrated. |
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ISSN: | 0301-4797 1095-8630 |
DOI: | 10.1016/j.jenvman.2021.112280 |