The objective of this study was to investigate the feasibility of biochar for removing Cd from aqueous solution. Biochars were produced from a Miscanthus sacchariflorus via slow pyrolysis at 300, 400, 500 and 600°C. Higher pyrolytic temperature resulted in biochar with a higher aromatic structure and fewer polar functional groups. In particular, pH and surface area of biochar increased greatly at pyrolytic temperatures ≥500°C, which increased Cd sorption capacity up to 13.24mgg-1 The diffuse-controlled Cd removal was likely due to a surface sorption or a precipitation reaction depending on pH. A simulation with the visual MINTEQ program indicated that the precipitate was Cd(OH)2. In addition, biochar treatment significantly removed the acute toxicity of Cd toward Daphnia magna , resulting in increase of EC50 (50% effective concentration) value from 0.16 to 0.76mgL-1
Bibliographical noteFunding Information:
This study was supported by a project from the Cooperative Research Program for Agriculture Science & Technology Development of the Rural Development Administration (Project No. PJ0079662011).
Copyright 2017 Elsevier B.V., All rights reserved.
- Heavy metal
- Slow pyrolysis
ASJC Scopus subject areas
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal