The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents

In this experiment, three kinds of hydrous manganese dioxide (HMO) with different Zeta potentials were synthesized, and combined with KMnO4 for deep removal of Pb2+, Cd2+ and Ni2+. The competitive adsorption of three heavy metal ions was also investigated. The results indicated that the stronger the...

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Autores principales:	Ruyue Ding, Chao Liu, Fencun Xie
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	competitive adsorption cyclic adsorption in-situ reaction regeneration water chemistry Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/f815d077161d448896c887cae6067c80
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spelling	oai:doaj.org-article:f815d077161d448896c887cae6067c802021-11-06T10:56:22ZThe combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents0273-12231996-973210.2166/wst.2021.108https://doaj.org/article/f815d077161d448896c887cae6067c802021-04-01T00:00:00Zhttp://wst.iwaponline.com/content/83/8/1987https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732In this experiment, three kinds of hydrous manganese dioxide (HMO) with different Zeta potentials were synthesized, and combined with KMnO4 for deep removal of Pb2+, Cd2+ and Ni2+. The competitive adsorption of three heavy metal ions was also investigated. The results indicated that the stronger the acidity, the higher the Zeta potential (-54.3) of the synthesized HMO. After regenerating HMO with acidic KMnO4 as eluent, the removal rates of Pb2+, Cd2+ and Ni2+ could still reach 79.25%, 80.13% and 60.43% after five cycles of adsorption. The promoting mechanism of KMnO4's effect on HMO was analyzed by SEM, TEM, EDS, FTIR, XRD, XPS, BET, and UV-vis. After absorbing heavy metal ions, HMO will release part of Mn (II), and the released Mn (II) reacts with KMnO4 to form a small amount of highly active in-situ HMO. The ‘HMO + KMnO4’ system can not only improve the removal rate of heavy metal ions by HMO, and reduce the amount of adsorbent, but also remove the released Mn (II). Because of its reproducibility, efficiency and simplicity, the research on water purification materials and technologies is of significance. HIGHLIGHTS A novel mesoporous δ-MnO2 nanoparticle with high Zeta potential, large specific surface area and high hydroxyl content was prepared.; Low cost, simple preparation and high adsorption capacity.; Competitive adsorption of heavy metal ions.; Regeneration and cyclic adsorption of adsorbents.; Adding KMnO4 can greatly improve the removal efficiency of heavy metals and remove the residual Mn (II) in the solution.;Ruyue DingChao LiuFencun XieIWA Publishingarticlecompetitive adsorptioncyclic adsorptionin-situ reactionregenerationwater chemistryEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 8, Pp 1987-2000 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	competitive adsorption cyclic adsorption in-situ reaction regeneration water chemistry Environmental technology. Sanitary engineering TD1-1066
spellingShingle	competitive adsorption cyclic adsorption in-situ reaction regeneration water chemistry Environmental technology. Sanitary engineering TD1-1066 Ruyue Ding Chao Liu Fencun Xie The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents
description	In this experiment, three kinds of hydrous manganese dioxide (HMO) with different Zeta potentials were synthesized, and combined with KMnO4 for deep removal of Pb2+, Cd2+ and Ni2+. The competitive adsorption of three heavy metal ions was also investigated. The results indicated that the stronger the acidity, the higher the Zeta potential (-54.3) of the synthesized HMO. After regenerating HMO with acidic KMnO4 as eluent, the removal rates of Pb2+, Cd2+ and Ni2+ could still reach 79.25%, 80.13% and 60.43% after five cycles of adsorption. The promoting mechanism of KMnO4's effect on HMO was analyzed by SEM, TEM, EDS, FTIR, XRD, XPS, BET, and UV-vis. After absorbing heavy metal ions, HMO will release part of Mn (II), and the released Mn (II) reacts with KMnO4 to form a small amount of highly active in-situ HMO. The ‘HMO + KMnO4’ system can not only improve the removal rate of heavy metal ions by HMO, and reduce the amount of adsorbent, but also remove the released Mn (II). Because of its reproducibility, efficiency and simplicity, the research on water purification materials and technologies is of significance. HIGHLIGHTS A novel mesoporous δ-MnO2 nanoparticle with high Zeta potential, large specific surface area and high hydroxyl content was prepared.; Low cost, simple preparation and high adsorption capacity.; Competitive adsorption of heavy metal ions.; Regeneration and cyclic adsorption of adsorbents.; Adding KMnO4 can greatly improve the removal efficiency of heavy metals and remove the residual Mn (II) in the solution.;
format	article
author	Ruyue Ding Chao Liu Fencun Xie
author_facet	Ruyue Ding Chao Liu Fencun Xie
author_sort	Ruyue Ding
title	The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents
title_short	The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents
title_full	The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents
title_fullStr	The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents
title_full_unstemmed	The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents
title_sort	combination of kmno4 with hmo for cyclic adsorption of heavy metal ions and regeneration of adsorbents
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/f815d077161d448896c887cae6067c80
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The combination of KMnO4 with HMO for cyclic adsorption of heavy metal ions and regeneration of adsorbents

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