Bioadsorbents of heavy metals from coal mines area in Mozambique

Mozambique is one of the largest coal exporters in Africa. Usually mining activities generate polluted water that is discharged into the Zambezi river basin in the Moatize area without treatment, increasing the risk both to the local environment and to public health because of this water containing...

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Main Authors: Estevao A. Jr. Pondja, Raed Bashitialshaaer, Kenneth M. Persson, Nelson Pedro Matsinhe
Format: Article
Language:English
Published: Taylor & Francis Group 2017-01-01
Series:Cogent Environmental Science
Subjects:
Online Access:http://dx.doi.org/10.1080/23311843.2017.1355088
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spelling doaj-34c140d02ca5408e80459e70271643032021-03-02T14:23:43ZengTaylor & Francis GroupCogent Environmental Science2331-18432017-01-013110.1080/23311843.2017.13550881355088Bioadsorbents of heavy metals from coal mines area in MozambiqueEstevao A. Jr. Pondja0Raed Bashitialshaaer1Kenneth M. Persson2Nelson Pedro Matsinhe3Lund UniversityLund UniversityLund UniversityEduardo Mondlane UniversityMozambique is one of the largest coal exporters in Africa. Usually mining activities generate polluted water that is discharged into the Zambezi river basin in the Moatize area without treatment, increasing the risk both to the local environment and to public health because of this water containing significant amounts of metals and metalloids. At the same time, Mozambique is one of the largest producers of cassava peels, most of which are wasted. The aim of the present investigation was to study the use of discarded cassava peels to treat the polluted mine water from Moatize by means of adsorption. The effects both of the pH and of the contact time between the adsorbent, the adsorbate and the adsorption isotherms were examined. For calcium, magnesium, cobalt, mercury and manganese, an equilibrium was attained in less than 50 min, the removal efficiency of calcium, magnesium, and mercury being greater under alkaline conditions and being greatest for cobalt at pH 4 and for manganese at pH 7.5. The correlation coefficients of the experimental data were very high for the calcium, magnesium and manganese metals as compared with the Langmuir and Freundlich isotherms. For the Langmuir isotherms, it was found that the adsorption of calcium, magnesium, cobalt, mercury, and manganese by the cassava peels was favorable for adsorption generally, whereas for the Freundlich isotherms it was only manganese that was found to be not favorable for adsorption.http://dx.doi.org/10.1080/23311843.2017.1355088mine wateradsorptioncassava peelslow-cost adsorbentscoal mines
collection DOAJ
language English
format Article
sources DOAJ
author Estevao A. Jr. Pondja
Raed Bashitialshaaer
Kenneth M. Persson
Nelson Pedro Matsinhe
spellingShingle Estevao A. Jr. Pondja
Raed Bashitialshaaer
Kenneth M. Persson
Nelson Pedro Matsinhe
Bioadsorbents of heavy metals from coal mines area in Mozambique
Cogent Environmental Science
mine water
adsorption
cassava peels
low-cost adsorbents
coal mines
author_facet Estevao A. Jr. Pondja
Raed Bashitialshaaer
Kenneth M. Persson
Nelson Pedro Matsinhe
author_sort Estevao A. Jr. Pondja
title Bioadsorbents of heavy metals from coal mines area in Mozambique
title_short Bioadsorbents of heavy metals from coal mines area in Mozambique
title_full Bioadsorbents of heavy metals from coal mines area in Mozambique
title_fullStr Bioadsorbents of heavy metals from coal mines area in Mozambique
title_full_unstemmed Bioadsorbents of heavy metals from coal mines area in Mozambique
title_sort bioadsorbents of heavy metals from coal mines area in mozambique
publisher Taylor & Francis Group
series Cogent Environmental Science
issn 2331-1843
publishDate 2017-01-01
description Mozambique is one of the largest coal exporters in Africa. Usually mining activities generate polluted water that is discharged into the Zambezi river basin in the Moatize area without treatment, increasing the risk both to the local environment and to public health because of this water containing significant amounts of metals and metalloids. At the same time, Mozambique is one of the largest producers of cassava peels, most of which are wasted. The aim of the present investigation was to study the use of discarded cassava peels to treat the polluted mine water from Moatize by means of adsorption. The effects both of the pH and of the contact time between the adsorbent, the adsorbate and the adsorption isotherms were examined. For calcium, magnesium, cobalt, mercury and manganese, an equilibrium was attained in less than 50 min, the removal efficiency of calcium, magnesium, and mercury being greater under alkaline conditions and being greatest for cobalt at pH 4 and for manganese at pH 7.5. The correlation coefficients of the experimental data were very high for the calcium, magnesium and manganese metals as compared with the Langmuir and Freundlich isotherms. For the Langmuir isotherms, it was found that the adsorption of calcium, magnesium, cobalt, mercury, and manganese by the cassava peels was favorable for adsorption generally, whereas for the Freundlich isotherms it was only manganese that was found to be not favorable for adsorption.
topic mine water
adsorption
cassava peels
low-cost adsorbents
coal mines
url http://dx.doi.org/10.1080/23311843.2017.1355088
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