Effective adsorption of mercury by Zr(IV)-based metal-organic frameworks of UiO-66-NH 2 from aqueous solution
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RESEARCH ARTICLE
Effective adsorption of mercury by Zr(IV)-based metal-organic frameworks of UiO-66-NH2 from aqueous solution Yufeng Zhao 1 & Dongfang Wang 2 & Wei Wei 3 & Longzhe Cui 1 & Chul-Woong Cho 4 & Guiping Wu 1 Received: 17 July 2020 / Accepted: 30 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, Zr-based metal-organic frameworks (MOFs) of UiO-66 and UiO-66-NH2 were synthesized and applied to removal of mercury from aqueous solution. The characterizations of UiO-66 and UiO-66-NH2 were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TGA). To investigate the adsorption properties of UiO-66NH2 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-NH2 has a higher adsorption capacity for mercury than UiO-66. The maximum adsorption capacity of UiO-66-NH2 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-NH2 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 UiO66-NH2 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-NH2 and amino functional group as a soft base played a major role to react with mercury during the adsorption process. Keywords UiO-66-NH2 . Mercury . Adsorption . Mechanisms
Introduction Mercury, as one of the highly toxic and accumulative heavy metals, has been found in various environmental Responsible Editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-11080-9) contains supplementary material, which is available to authorized users. * Chul-Woong Cho [email protected] * Guiping Wu [email protected] 1
College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, China
2
Hubei Academy of Environmental Sciences, Wuhan 430072, China
3
Key Laboratory for Synergistic Prevention of Water and Soil Environmental Pollution, Xinyang Normal University, Xinyang 464000, China
4
Department of Bioenergy Science and Technology, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
media including soil, atmosphere, water, and organisms (Manohar et al. 2002). Mercury can be released from several sources such as electronics, paints, pharmaceuticals, paper and pulp, chlor-alkali, oil refinement, plastics, rubber processing, and manufacturing industries (Hadavifar et al. 2014; Xiong et al. 2015). Moreover, mercury compounds can persist and accumulate in the environment, causing severe toxicity to human and animals, espec
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