Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 674, Issue -, Pages 213-222Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.03.438
Keywords
Biochar; Cadmium; Co-precipitation; Modification; Sorption characteristics; Transabdominal transformation
Categories
Funding
- National Natural Science Foundation of China [41807126]
- National Key Research and Development Program of China [SQ2018YFD080041]
- Applied Basic Research Programs of Sichuan Science and Technology Department [2018JY0002]
- Key Program of China National Tobacco Corporation Sichuan [SCYC201803]
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Biologically modified biochars derived from digestion residue of corn straw silage at different pyrolysis temperature (300-700 degrees C) were prepared for removing Cd from water. Compared with the pristine biochar derived from corn straw (CB), transabdominal transformation of corn straw silage (TCB) significantly increased surface area (4.24-56.58 m(2) g(-1)), oxygen-containing functional group (C-O-C, Mg-O, Si-O) and mineral components (CaCO3, KCl). The sorption isotherms could be well described by Langmuir model, the kinetic data was best fitted by the Pseudo second order model. The maximum sorption capacity (Qm) obtained from Langmuir model for TCB700 (175.44 mg g(-1)) was 3 times of CB700 (56.82 mg g(-1)). Precipitation with minerals, ion exchange and complexation with oxygen-containing functional groups were the main mechanisms of Cd(II) sorption on TCB. These results imply that biologically modified biochar derived from digestion residue of corn straw silage at >= 600 degrees C is an effective sorbent for Cd removal from water. (C) 2019 Elsevier B.V. All rights reserved.
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