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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2017
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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. |
format | Online Article Text |
id | pubmed-5418241 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
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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