| 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. |
| 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 |
| 投稿时间：2017-03-03 |
| DOI：10.11654/jaes.2017-0269 |
| 中文关键词: 小麦秸秆 生物炭 Cu2+ 吸附平衡 接触角 |
| 英文关键词: wheat straw biochar Cu2+ adsorption equilibrium contact angle |
| 基金项目:国家自然科学基金项目（41501232）；国家级创新训练项目（201610019027） |
| 作者 | 单位 | E-mail | | 尹英杰 | 中国农业大学资源与环境学院, 北京 100193 | | | 朱司航 | 中国农业大学资源与环境学院, 北京 100193
教育部植物-土壤相互作用重点实验室, 北京 100193
农业部华北耕地保育重点实验室, 北京 100193 | | | 徐东昊 | 中国农业大学资源与环境学院, 北京 100193 | | | 楚龙港 | 中国农业大学资源与环境学院, 北京 100193 | | | 陈冲 | 中国农业大学资源与环境学院, 北京 100193
教育部植物-土壤相互作用重点实验室, 北京 100193
农业部华北耕地保育重点实验室, 北京 100193 | | | 赵晶晶 | 中国农业大学资源与环境学院, 北京 100193
教育部植物-土壤相互作用重点实验室, 北京 100193
农业部华北耕地保育重点实验室, 北京 100193 | | | 商建英 | 中国农业大学资源与环境学院, 北京 100193
教育部植物-土壤相互作用重点实验室, 北京 100193
农业部华北耕地保育重点实验室, 北京 100193 | jyshang@cau.edu.cn |
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| 中文摘要: |
| 为研究生物炭和乙醇改性生物炭的特性及其对铜的吸附能力，选取小麦秸秆为原料，在300、450、600℃条件下热解制备生物炭，用于研究乙醇改性生物炭的产油率、生物炭和乙醇改性生物炭的表面官能团变化、亲水性能及其对Cu2+的吸附特性。结果表明：乙醇改性生物炭产油率随热解温度升高而增加。生物炭和乙醇改性生物炭不同温度接触角范围为122.6°~89.3°和96.0°~68.7°，乙醇改性生物炭亲水性明显高于未经改性生物炭。生物炭和改性生物炭对Cu2+的吸附符合二级动力学模型，生物炭吸附速率常数达1.535 g·mg-1·h-1，乙醇改性生物炭为1.073 g·mg-1·h-1。二者对Cu2+的等温吸附过程符合Langmuir等温吸附模型，生物炭和乙醇改性生物炭最大吸附量分别为44.3 mg·g-1和41.7 mg·g-1，说明使用乙醇萃取生物炭生物质油后，仍能保持90%左右的Cu2+吸附效率。 |
| 英文摘要: |
| 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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