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Effect of combined aging treatment on biochar adsorption and speciation distribution for Cd(II) by Yuxin Ke; Fuxiang Zhang; Zulin Zhang; Rupert Hough; Qiang Fu; Yi-Fan Li; Song Cui is a Environmental Science article available to read on EtoBox.

What is Effect of combined aging treatment on biochar adsorption and speciation distribution for Cd(II) about?

As a passivation material for heavy metals in-situ remediation, biochar (BC) has often been expected to maintain long-term adsorption performance for target pollutants. There is still lack of consensus about the impact of aging processes on biochar properties, particularly with respect to its long-term sorption performance. In this study, the changes to immobilization mechanisms as well as the speciation distribution of Cd(II) triggered by combined aging simulation (dry-wet, freeze-thaw cycle and oxidation treatment) on BC prepared under three levels of pyrolysis temperatures (300, 500 and 700 °C) were investigated. The results showed significant inhibition of aging on adsorption performance with the adsorptive capacity of BC300, BC500 and BC700 for Cd(II) decreased by 31.12 %, 50.63 % and 14.94 %, respectively. However, sequential extraction results indicated little influence of the aging process on the relative fractionation of Cd(II) speciation. The distribution of readily bioavailable, potentially bioavailable and non-bioavailable fractions of Cd(II) on BC showed only minimal changes post-aging. Overall, there was less Cd(II) sorption following aging, but the fractional availab

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Author

Yuxin Ke; Fuxiang Zhang; Zulin Zhang; Rupert Hough; Qiang Fu; Yi-Fan Li; Song Cui

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)