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Corn stover–derived biochar for efficient adsorption of oxytetracycline from wastewater

Published online by Cambridge University Press:  20 June 2019

Min Zhang
College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
Jun Meng
Biochar Engineering & Technology Research Center, Shenyang Agricultural University, Shenyang 110866, China
Qingyu Liu
College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
Shiyan Gu
College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
Ling Zhao
College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
Mengyao Dong
Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China
Jiaoxia Zhang
School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China
Hua Hou
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Zhanhu Guo
Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
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Biochar conversion from corn stover was evaluated under various process conditions, and the absorption capacity of biochar was investigated for the removal of oxytetracycline in wastewater. Biochar was prepared at lower carbonization temperatures (200–500 °C) and was used in three different concentrations of chemical oxygen wastewater. The results showed that the biochar prepared at the temperature range of 200–500 °C had a faster sorption rate and shorter sorption equilibrium time compared to biochar produced at higher temperatures. The longest time to reach sorption equilibrium was 9 h for biochar obtained at 200 °C. However, the biochar prepared at 500 °C required only 0.5 h to reach the sorption equilibrium. The corn stover-biochar had the highest sorption capacity of 246.3 mg/g for oxytetracycline at 30 °C. The adsorption kinetics was consistent with pseudo–second-order kinetics. This study provides a theoretical basis for the conversion of corn stover into biochar as efficient sorbents.

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Corn stover–derived biochar for efficient adsorption of oxytetracycline from wastewater
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