Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk
Publication Date
2017-05-01Journal Title
Environmental Science and Pollution Research
ISSN
0944-1344
Publisher
Springer Verlag
Volume
24
Issue
14
Pages
12809-12819
Language
English
Type
Article
This Version
VoR
Metadata
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Shen, Z., Zhang, Y., McMillan, O., Jin, F., & Al-Tabbaa, A. (2017). Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk. Environmental Science and Pollution Research, 24 (14), 12809-12819. https://doi.org/10.1007/s11356-017-8847-2
Abstract
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.
Keywords
biochar, adsorption studies, adsorption capacity, standardised production, adsorption mechanisms, nickel
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1007/s11356-017-8847-2
This record's URL: https://www.repository.cam.ac.uk/handle/1810/264536
Rights
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International