Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

In this study, the manganese-doped manganese–cobalt–iron spinel was prepared by the sol–gel self-combustion method, and its physical and chemical properties were analyzed by XRD (X-ray diffraction analysis), SEM (scanning electron microscope), and VSM (vibrating sample magnetometer). The mercury rem...

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Autores principales:	Jiawei Huang, Zhaoping Zhong, Yueyang Xu, Yuanqiang Xu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	mercury removal magnetic manganese cobalt iron spinel Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/762767a1e3994081a3cc591d3a607104
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spelling	oai:doaj.org-article:762767a1e3994081a3cc591d3a6071042021-11-25T18:59:30ZStudy on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance10.3390/separations81102252297-8739https://doaj.org/article/762767a1e3994081a3cc591d3a6071042021-11-01T00:00:00Zhttps://www.mdpi.com/2297-8739/8/11/225https://doaj.org/toc/2297-8739In this study, the manganese-doped manganese–cobalt–iron spinel was prepared by the sol–gel self-combustion method, and its physical and chemical properties were analyzed by XRD (X-ray diffraction analysis), SEM (scanning electron microscope), and VSM (vibrating sample magnetometer). The mercury removal performance of simulated flue gas was tested on a fixed bed experimental device, and the effects of Mn doping amount, fuel addition amount, reaction temperature, and flue gas composition on its mercury removal capacity were studied. The results showed that the best synthesized product was when the doping amount of Mn was the molar ratio of 0.5, and the average mercury removal efficiency was 87.5% within 120 min. Among the fuel rich, stoichiometric ratio, and fuel lean systems, the stoichiometric ratio system is most conductive to product synthesis, and the mercury removal performance of the obtained product was the best. Moreover, the removal ability of Hg<sup>0</sup> was enhanced with the increase in temperature in the test temperature range, and both physical and chemical adsorption play key roles in the spinel adsorption of Hg<sup>0</sup> in the medium temperature range. The addition of O<sub>2</sub> can promote the removal of Hg<sup>0</sup> by adsorbent, but the continuous increase after the volume fraction reached 10% had little effect on the removal efficiency of Hg<sup>0</sup>. While SO<sub>2</sub> inhibited the removal of mercury by adsorbent, the higher the volume fraction, the more obvious the inhibition. In addition, in an oxygen-free environment, the addition of a small amount of HCl can promote the removal of mercury by adsorbent, but the addition of more HCl does not have a better promotion effect. Compared with other reported adsorbents, the adsorbent has better mercury removal performance and magnetic properties, and has a strong recycling performance. The removal efficiency of mercury can always be maintained above 85% in five cycles.Jiawei HuangZhaoping ZhongYueyang XuYuanqiang XuMDPI AGarticlemercury removalmagneticmanganesecobaltironspinelPhysicsQC1-999ChemistryQD1-999ENSeparations, Vol 8, Iss 225, p 225 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mercury removal magnetic manganese cobalt iron spinel Physics QC1-999 Chemistry QD1-999
spellingShingle	mercury removal magnetic manganese cobalt iron spinel Physics QC1-999 Chemistry QD1-999 Jiawei Huang Zhaoping Zhong Yueyang Xu Yuanqiang Xu Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance
description	In this study, the manganese-doped manganese–cobalt–iron spinel was prepared by the sol–gel self-combustion method, and its physical and chemical properties were analyzed by XRD (X-ray diffraction analysis), SEM (scanning electron microscope), and VSM (vibrating sample magnetometer). The mercury removal performance of simulated flue gas was tested on a fixed bed experimental device, and the effects of Mn doping amount, fuel addition amount, reaction temperature, and flue gas composition on its mercury removal capacity were studied. The results showed that the best synthesized product was when the doping amount of Mn was the molar ratio of 0.5, and the average mercury removal efficiency was 87.5% within 120 min. Among the fuel rich, stoichiometric ratio, and fuel lean systems, the stoichiometric ratio system is most conductive to product synthesis, and the mercury removal performance of the obtained product was the best. Moreover, the removal ability of Hg<sup>0</sup> was enhanced with the increase in temperature in the test temperature range, and both physical and chemical adsorption play key roles in the spinel adsorption of Hg<sup>0</sup> in the medium temperature range. The addition of O<sub>2</sub> can promote the removal of Hg<sup>0</sup> by adsorbent, but the continuous increase after the volume fraction reached 10% had little effect on the removal efficiency of Hg<sup>0</sup>. While SO<sub>2</sub> inhibited the removal of mercury by adsorbent, the higher the volume fraction, the more obvious the inhibition. In addition, in an oxygen-free environment, the addition of a small amount of HCl can promote the removal of mercury by adsorbent, but the addition of more HCl does not have a better promotion effect. Compared with other reported adsorbents, the adsorbent has better mercury removal performance and magnetic properties, and has a strong recycling performance. The removal efficiency of mercury can always be maintained above 85% in five cycles.
format	article
author	Jiawei Huang Zhaoping Zhong Yueyang Xu Yuanqiang Xu
author_facet	Jiawei Huang Zhaoping Zhong Yueyang Xu Yuanqiang Xu
author_sort	Jiawei Huang
title	Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance
title_short	Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance
title_full	Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance
title_fullStr	Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance
title_full_unstemmed	Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance
title_sort	study on the preparation of magnetic mn–co–fe spinel and its mercury removal performance
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/762767a1e3994081a3cc591d3a607104
work_keys_str_mv	AT jiaweihuang studyonthepreparationofmagneticmncofespinelanditsmercuryremovalperformance AT zhaopingzhong studyonthepreparationofmagneticmncofespinelanditsmercuryremovalperformance AT yueyangxu studyonthepreparationofmagneticmncofespinelanditsmercuryremovalperformance AT yuanqiangxu studyonthepreparationofmagneticmncofespinelanditsmercuryremovalperformance
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Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

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