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Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk

The adsorption characteristics and mechanisms of Ni(2+) on four-standard biochars produced from wheat straw pellets (WSP550, WSP700) and rice husk (RH550, RH700) at 550 and 700 °C, respectively, were investigated. The kinetic results show that the adsorption of Ni(2+) on the biochars reached an equi...

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Autores principales: Shen, Zhengtao, Zhang, Yunhui, McMillan, Oliver, Jin, Fei, Al-Tabbaa, Abir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5418241/
https://www.ncbi.nlm.nih.gov/pubmed/28364204
http://dx.doi.org/10.1007/s11356-017-8847-2
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author Shen, Zhengtao
Zhang, Yunhui
McMillan, Oliver
Jin, Fei
Al-Tabbaa, Abir
author_facet Shen, Zhengtao
Zhang, Yunhui
McMillan, Oliver
Jin, Fei
Al-Tabbaa, Abir
author_sort Shen, Zhengtao
collection PubMed
description The adsorption characteristics and mechanisms of Ni(2+) on four-standard biochars produced from wheat straw pellets (WSP550, WSP700) and rice husk (RH550, RH700) at 550 and 700 °C, respectively, were investigated. The kinetic results show that the adsorption of Ni(2+) on the biochars reached an equilibrium within 5 min. The increase of the solid to liquid ratio resulted in an increase of Ni(2+) removal percentage but a decrease of the adsorbed amount of Ni(2+) per weight unit of biochar. The Ni(2+) removal percentage increased with the increasing of initial solution pH values at the range of 2–4, was relatively constant at the pH range of 4–8, and significantly increased to ≥98% at pH 9 and stayed constantly at the pH range of 9–10. The calculated maximum adsorption capacities of Ni(2+) for the biochars follow the order of WSP700 > WSP550 > RH700 > RH550. Both cation exchange capacity and pH of biochar can be a good indicator of the maximum adsorption capacity for Ni(2+) showing a positively linear and exponential relationship, respectively. This study also suggests that a carefully controlled standardised production procedure can make it reliable to compare the adsorption capacities between different biochars and investigate the mechanisms involved. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11356-017-8847-2) contains supplementary material, which is available to authorized users.
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spelling pubmed-54182412017-05-19 Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk Shen, Zhengtao Zhang, Yunhui McMillan, Oliver Jin, Fei Al-Tabbaa, Abir Environ Sci Pollut Res Int Research Article The adsorption characteristics and mechanisms of Ni(2+) on four-standard biochars produced from wheat straw pellets (WSP550, WSP700) and rice husk (RH550, RH700) at 550 and 700 °C, respectively, were investigated. The kinetic results show that the adsorption of Ni(2+) on the biochars reached an equilibrium within 5 min. The increase of the solid to liquid ratio resulted in an increase of Ni(2+) removal percentage but a decrease of the adsorbed amount of Ni(2+) per weight unit of biochar. The Ni(2+) removal percentage increased with the increasing of initial solution pH values at the range of 2–4, was relatively constant at the pH range of 4–8, and significantly increased to ≥98% at pH 9 and stayed constantly at the pH range of 9–10. The calculated maximum adsorption capacities of Ni(2+) for the biochars follow the order of WSP700 > WSP550 > RH700 > RH550. Both cation exchange capacity and pH of biochar can be a good indicator of the maximum adsorption capacity for Ni(2+) showing a positively linear and exponential relationship, respectively. This study also suggests that a carefully controlled standardised production procedure can make it reliable to compare the adsorption capacities between different biochars and investigate the mechanisms involved. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11356-017-8847-2) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2017-03-31 2017 /pmc/articles/PMC5418241/ /pubmed/28364204 http://dx.doi.org/10.1007/s11356-017-8847-2 Text en © The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Research Article
Shen, Zhengtao
Zhang, Yunhui
McMillan, Oliver
Jin, Fei
Al-Tabbaa, Abir
Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
title Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
title_full Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
title_fullStr Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
title_full_unstemmed Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
title_short Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
title_sort characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5418241/
https://www.ncbi.nlm.nih.gov/pubmed/28364204
http://dx.doi.org/10.1007/s11356-017-8847-2
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