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| Adsorption of Pyrene from Aqueous Solution by Biochars Produced from Different Crop Residues |
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| KeyWord:crop residues; biochars; pyrene; adsorption |
| Author Name | Affiliation | | SUN Xuan | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | LI Lian-qing | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | PAN Gen-xing | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | ZHENG Ju-feng | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | ZHANG Xu-hui | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | ZHENG Jin-wei | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | YU Xin-yan | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | WANG Jia-fang | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China |
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| Abstract: |
| In this study, biochars produced via pyrolysis of wheat straw, corn straw and peanut husk were used as adsorbents for pyrene removal from aqueous solution. Adsorption and desorption of pyrene by different biochars were evaluated at different contact time, initial concentrations and adsorbent doses. Adsorption of pyrene on biochars reached equilibrium almost within 12 h, and the process was described by the pseudo second order dynamic equation. The equilibrium adsorption was fitted with both Langmiur and Freundlich equation, with Langmiur better. The maximum adsorption was 1667 μg·g-1, 714 μg·g-1 and 370 μg·g-1 at 25 ℃ for corn straw, wheat straw and peanut husk biochars, respectively. The removal rates of pyrene from solution was over 90% for three biochars at 500 mg·L-1 addition. The desorption rates of adsorbed pyrene were less than 7% for three biochars during 6 days. Our results suggest that biochars produced from crop residues, especially corn straw, could act as potential adsorbents in removing polycyclic aromatic hydrocarbon（PAHs） from aqueous solution. |
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