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Sci Total Environ. 2019 Jul 15;674:213-222. doi: 10.1016/j.scitotenv.2019.03.438. Epub 2019 Mar 29.

Enhanced Cd removal from aqueous solution by biologically modified biochar derived from digestion residue of corn straw silage.

Author information

1
College of Resources, Sichuan Agricultural University, Chengdu 611130, China.
2
College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China.
3
China National Tobacco Corporation Sichuan, Chengdu 610041, Sichuan, China.
4
Liangshan Branch of Sichuan Provincial Tobacco Company, Xichang 615000, Sichuan, China.
5
College of Resources, Sichuan Agricultural University, Chengdu 611130, China. Electronic address: w.changquan@163.com.

Abstract

Biologically modified biochars derived from digestion residue of corn straw silage at different pyrolysis temperature (300-700 °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 m2 g-1), oxygen-containing functional group (COC, MgO, SiO) 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 °C is an effective sorbent for Cd removal from water.

KEYWORDS:

Biochar; Cadmium; Co-precipitation; Modification; Sorption characteristics; Transabdominal transformation

PMID:
31004898
DOI:
10.1016/j.scitotenv.2019.03.438
[Indexed for MEDLINE]

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