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| Effect of the pyrolysis temperature on biochar adsorption of Pb2+ |
| Received:July 11, 2018 Revised:October 22, 2018 |
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| KeyWord:pyrolysis temperature;rice husk;cotton straw;biochar;Pb2+;adsorption |
| Author Name | Affiliation | E-mail | | LIU Jie | New Technological Key Laboratory of Agricultural Application in Beijing/Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China | | | SHI Sheng-li | New Technological Key Laboratory of Agricultural Application in Beijing/Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China | | | JIA Yue-hui | New Technological Key Laboratory of Agricultural Application in Beijing/Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China | yhjia@bua.edu.cn | | GAO Fan | New Technological Key Laboratory of Agricultural Application in Beijing/Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China | | | LIANG Qiong | New Technological Key Laboratory of Agricultural Application in Beijing/Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China | | | SU Shi-ming | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Scieces, Beijing 100081, China | | | YANG Jian-jun | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Scieces, Beijing 100081, China | | | ZENG Xi-bai | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Scieces, Beijing 100081, China | | | WANG Tao | New Technological Key Laboratory of Agricultural Application in Beijing/Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China | |
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| Abstract: |
| To investigate the effects of additive amounts, initial pH, and adsorption duration on Pb2+ adsorption, we prepared the biochars from rice husk and cotton straw at 300, 400, 500, 600, and 700℃. The results showed that the amount of Pb2+ adsorbed was gradually enhanced with the increasing rate of biochars and was higher with the higher pyrolysis temperature at the same rate of biochars.The adsorption effect was positively correlated with the pH of the solution and better especially in the range of pH 4~7. The fitting curves of Pb2+ adsorption by biochars were better by the quasi-second-order kinetic model (R2 ≥ 0.992)than the quasi-first-order kinetic model.The higher the pyrolysis temperature, the faster the adsorption rate. Meanwhile, the equilibrium adsorption capacity of Pb2+ by biochars reached no less than 49.0 mg·g-1 at medium temperature (500℃)and high temperature (600℃ and 700℃). The suitable temperature for preparing rice husk and cotton stalks is about 500℃. |
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