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| Characterization of phosphorus adsorption behaviors by biochar with benzene polycarboxylic acid molecular biomarkers |
| Received:August 10, 2020 |
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| KeyWord:biochar;benzene polycarboxylic acids;molecular biomarker;phosphorus;adsorption |
| Author Name | Affiliation | E-mail | | ZHANG Jun | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | ZHOU Dan-dan | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | 01yongheng@163.com | | CHANG Zhao-feng | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | WANG Wei | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | LI Fang-fang | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | LIU Yang | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | CHU Gang | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | GU Zheng-gang | Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China | |
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| Abstract: |
| Biochar has good applications in agricultural non-point pollution control owing to its porous, large specific surface area, rich oxygen-containing functional groups, and strong aromaticity. However, biochar is difficult to separate from soil particles after its application to soil, limiting the prediction of adsorption behaviors of biochar to agricultural non-point source pollutants. Molecular biomarker technology has made important contributions to the understanding of organic carbon behavior, and the benzene polycarboxylic acid(BPCAs) molecular biomarker method may provide a new perspective for understanding the interactions between biochar and phosphorus. In this study, batch experiments were carried out to investigate the adsorption behaviors of tobacco stalk, pine wood, and their derived biochars. Results showed that the content of BPCAs and the contribution rate of mellitic acid to BPCAs increased with an increase in pyrolysis temperature of biomass and biochar. The content of each BPCA and the contribution rate of benzene hexacarboxylic acid (B6CA) to BPCA increases with an increase in pyrolysis temperature. The degree of aromatic condensation of biochar continued to increase. The amount of phosphorus adsorbed by biochar decreased with an increase in pyrolysis temperature. Biochar from tobacco stalk had the largest adsorption capacity for phosphorus at 400℃, while biochar from pine wood had the largest adsorption capacity at 200℃. The decrease in surface oxygen-containing functional groups and the increase in electrostatic repulsion negatively affected the adsorption capacity of the biochars. Adsorption capacity of biochar from tobacco stalk was higher than that of biochar from pine for the former larger specific surface area and higher content of B6CA. |
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