ORIGINAL RESEARCH
Effect of Sludge Biochars Obtained at Different
Pyrolysis Temperatures on the Adsorption
of Cd(II)by Loess in Northwestern China
Liang Dai, Jun Ren, Ling Tao, Hua Li, JianXiu Hao
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University,
Lanzhou, Gansu 730070, China
Lanzhou, Gansu 730070, China
Submission date: 2017-02-14
Final revision date: 2017-03-14
Acceptance date: 2017-03-16
Online publication date: 2017-07-12
Publication date: 2017-07-25
Pol. J. Environ. Stud. 2017;26(4):1485–1492
KEYWORDS
TOPICS
ABSTRACT
The effect of sludge biochars obtained at different temperatures on the adsorption of Cd(II) by loess
in northwestern China was investigated using the batch equilibrium method. The results showed that the
pseudo second-order kinetic model can describe the kinetics of Cd(II) adsorption on the sludge biocharamended
loess very well. The adsorption of Cd(II) by loess reached equilibrium in 6h. However, with
the addition of biochar, the adsorption time of the Cd(II) by loess decreased. In addition, the adsorption
equilibrium time decreased significantly with increasing pyrolysis temperatures. When the pH increased
from 2 to 7, the adsorption capacity of biochar-amended loess increased, while the adsorption capacity was
in equilibrium or even slightly decreased in the pH range from 7 to 8. The Langmuir model can describe
the adsorption isothermal behaviours of Cd(II) by biochar-amended loess. The adsorption capacity of
biochar-amended loess samples for Cd(II) at 25°C follows the order of LSB700 (28.74 mg/g)>LSB500
(22.42 mg/g)>LSB300 (17.67 mg/g). The addition of sludge biochars can significantly improve the saturation
adsorption capacity of loess for Cd(II). Therefore, the addition of sludge biochars can effectively improve
the adsorption-immobilization capability of loess for Cd(II).
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