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| Structural feature and chromium(Ⅵ) adsorption of biochar derived from Pennisetum hydridum |
| Received:November 26, 2015 |
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| KeyWord:biochar;Pennisetum hydridum;pyrolysis temperature;chromium(Ⅵ);adsorption performance;scanning electron microscopy |
| Author Name | Affiliation | E-mail | | LAI Chang-hong | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | YAN Zeng-guang | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | LIAO Bo-wen | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | LI Song-wei | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | HE Hong-zhi | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | LI Hua-shou | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | CHEN Gui-kui | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | guikuichen@scau.edu.cn |
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| Abstract: |
| This research investigated the structural feature of biochar derived from Pennisetum hydridum under hypoxia conditions at three pyrolysis temperatures(300 ℃, 500 ℃, and 700 ℃) and its chromium(Ⅵ) adsorption. Results showed that increasing pyrolysis temperature decreased the biochar production rates, but increased ash content and pH values. Scanning electron microscopy showed that the hole wall of the biochar prepared at 700 ℃ was thinner, with more attachments and protuberances inside than that at 300 ℃. All three biochars had good adsorption of Cr(VI), with adsorption capacity being higher at 500 ℃ and 700 ℃ than at 300 ℃. The adsorption of Cr(VI) by biochars increased quickly and reached saturation after 1 h, and remained no obvious changes after that. |
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