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| Comparison of copper adsorption onto wheat biochar and ethanol-modified biochar |
| Received:March 03, 2017 |
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| KeyWord:wheat straw;biochar;Cu2+;adsorption equilibrium;contact angle |
| Author Name | Affiliation | E-mail | | YIN Ying-jie | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | ZHU Si-hang | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | | | XU Dong-hao | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | CHU Long-gang | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | CHEN Chong | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | | | ZHAO Jing-jing | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | | | SHANG Jian-ying | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | jyshang@cau.edu.cn |
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| Abstract: |
| To test the performance of biochar with and without bio-oil for the removal of heavy metals, wheat straw biochars pyrolyzed at three temperatures(300℃, 450℃, and 600℃) were used and then modified by ethanol solution. The ethanol-modified biochars were prepared in 75% ethanol solution for 12 hours to remove bio-oils from the biochars. The characteristics of the raw and ethanol-modified biochars were analyzed, and batch and kinetic adsorption experiments were conducted. The results showed that more bio-oil production rate was obtained using the ethanol-modified biochar pyrolyzed at higher temperature. The contact angle ranges of the raw and ethanol-modified biochars with water were from 122.6° to 89.3° and from 96.0° to 68.7°, respectively, which meant that the ethanol-modified biochars showed less hydrophobicity than the raw biochars did. Ethanol modification had almost no effect on the adsorption rate of the biochar pyrolyzed at 300℃, and decreased the adsorption rate of the raw biochar pyrolyzed at 600℃ by 30%, from 1.535 g·mg-1·h-1 to 1.073 g·mg-1·h-1. Ethanol modification only slightly decreased the maximum adsorption capacity of the biochars pyrolyzed at all three temperatures, as the biochar modified with ethanol still had around 90% adsorption capacity of the biochars without ethanol modification. The copper adsorption processes onto the raw and ethanol-modified biochars were well fitted by second-order kinetics and Langmuir adsorption models. |
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