农业环境科学学报2017，Vol.36Issue(9)：1877-1883,7.DOI:10.11654/jaes.2017-0269
生物炭和乙醇改性生物炭对铜的吸附研究
Comparison of copper adsorption onto wheat biochar and ethanol-modified biochar
摘要
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 pre-pared 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.关键词
小麦秸秆/生物炭/Cu2+/吸附平衡/接触角Key words
wheat straw/biochar/Cu2+/adsorption equilibrium/contact angle分类
资源环境引用本文复制引用
尹英杰,朱司航,徐东昊,楚龙港,陈冲,赵晶晶,商建英..生物炭和乙醇改性生物炭对铜的吸附研究[J].农业环境科学学报,2017,36(9):1877-1883,7.基金项目
国家自然科学基金项目(41501232) （41501232）
国家级创新训练项目(201610019027) The National Natural Science Foundation of China(41501232) （201610019027）
National Innovation Training Program,China(201610019027) （201610019027）
