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

Shen, Z and Zhang, Y and McMillan, O and Jin, F and Al-Tabbaa, A (2017) Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice husk. Environ Sci Pollut Res Int, 24. pp. 12809-12819.

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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.

Item Type: Article
Uncontrolled Keywords: Adsorption capacity Adsorption mechanisms Adsorption studies Biochar Nickel Standardised production Adsorption Charcoal Nickel Oryza Triticum
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:26
Last Modified: 21 Nov 2017 03:52
DOI: