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

Shen, Zhengtao, Zhang, Yunhui, McMillan, Oliver, Jin, Fei and Al-Tabbaa, Abir 2017. Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk. Environmental Science and Pollution Research 24 (14) , pp. 12809-12819. 10.1007/s11356-017-8847-2

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The adsorption characteristics and mechanisms of Ni2+ 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 Ni2+ on the biochars reached an equilibrium within 5 min. The increase of the solid to liquid ratio resulted in an increase of Ni2+ removal percentage but a decrease of the adsorbed amount of Ni2+ per weight unit of biochar. The Ni2+ 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 Ni2+ 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 Ni2+ 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Springer Verlag (Germany)
ISSN: 0944-1344
Date of First Compliant Deposit: 21 July 2020
Date of Acceptance: 16 March 2017
Last Modified: 21 Jul 2020 13:15

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