Characteristics and mechanisms of nickel adsorption on biochars produced from wheat straw pellets and rice huskReport as inadecuate




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Environmental Science and Pollution Research

, Volume 24, Issue 14, pp 12809–12819

First Online: 31 March 2017Received: 04 November 2016Accepted: 16 March 2017DOI: 10.1007-s11356-017-8847-2

Cite this article as: Shen, Z., Zhang, Y., McMillan, O. et al. Environ Sci Pollut Res 2017 24: 12809. doi:10.1007-s11356-017-8847-2

Abstract

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

KeywordsBiochar Standardised production Adsorption studies Adsorption capacity Adsorption mechanisms Nickel Responsible editor: Guilherme L. Dotto

Electronic supplementary materialThe online version of this article doi:10.1007-s11356-017-8847-2 contains supplementary material, which is available to authorized users.





Author: Zhengtao Shen - Yunhui Zhang - Oliver McMillan - Fei Jin - Abir Al-Tabbaa

Source: https://link.springer.com/







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