制备温度对竹炭基生物炭理化特征的影响

张卓然; 刘清华; 王伟刚; 戎静; 曹瑞杰; 罗文涛; 刘超; 王亚宜

doi:10.13205/j.hjgc.202111012

制备温度对竹炭基生物炭理化特征的影响

doi: 10.13205/j.hjgc.202111012

1. 同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室, 上海 200092;
2. 上海环云再生能源有限公司, 上海 200092

基金项目:

上海市国资委技术创新和能级提升项目"垃圾渗滤液提标处理和智慧管控技术装备集成与示范"（2018001）。

详细信息

作者简介:
张卓然(1998-),女,硕士研究生,主要研究方向为水污染控制和微生物技术。1224184349@qq.com

通讯作者:
戎静(1981-),女,主要研究方向为湿垃圾处理及资源化。rj0304@126.com

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出版历程
- 收稿日期: 2021-08-04
- 网络出版日期: 2022-01-26

EFFECT OF PYROLYSIS TEMPERATURE ON THE PHYSICAL AND CHEMICAL CHARACTERISTICS OF BAMBOO-BASED BIOCHAR

1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Huanyun Renewable Energy Co., Ltd, Shanghai 200092, China

摘要

摘要: 生物炭作为新型环境功能材料，在环境污染修复、土壤改良、温室气体减排、强化污水生物脱氮方面应用前景广阔。为探究不同制备温度对竹炭基生物炭理化特征的影响，以竹粉为原料在不同温度条件下制备生物炭，并对其得失电子能力（EEC）、表面官能团及元素组成等进行表征。结果表明：当热解温度从300℃升高到700℃的过程中，电子供给能力（EDC）总体呈先升高再降低的规律，其中300，400℃下热解得到的生物炭EDC最高，分别为0.33，0.35 mmol e^-/g，具有更高的强化生物脱氮潜能；600℃下制备的生物炭EDC最低，为0.07 mmol e^-/g。由元素含量计算所得的平均氧化度C_ox与EDC的结果相对应。随着制备温度的升高，热解所得生物炭的平均氧化度由负值变为正值，300，400℃下热解得到的生物炭的C_ox为负值，表明300，400℃条件下比500~700℃下所得生物炭还原性更强，氧化性更弱，即电子供给能力（EDC）更大，电子接收能力（EAC）更小。傅里叶红外光谱结果显示，300，400℃下热解所得生物炭羟基含量最高，与其EDC的结果相吻合。
- 竹炭基生物炭 /
- 热解温度 /
- 得失电子能力
Abstract: As a new environmental functional material, biochar showed application prospects in environmental pollution remediation, soil improvement, greenhouse gas emission reduction, and enhanced biological nitrogen removal from wastewater. Biochars were prepared from bamboo powder at different pyrolysis temperatures, and their electron exchange capacity, surface functional groups, and elemental composition were characterized to explore the effect of pyrolysis temperatures on the physicochemical characteristics of bamboo-based biochar. The results showed that while the pyrolysis temperature increased from 300℃ to 700℃, the electron donating capacity (EDC) of biochars generally increased first and then decreased. The highest EDC was obtained in the biochars prepared at 300℃ and 400℃ with the value of 0.33 e^-/g Biochar and 0.35 e^-/g Biochar, respectively, had higher potential in improving biological nitrogen removal; and the lowest EDC was obtained in the biochars prepared at 600℃ with the value of 0.07 e^-/g Biochar. Accordingly, the average oxidation degree C_ox calculated from the elemental content was corresponding to the results of EDC. With the increase of pyrolysis temperature, the C_ox of biochars changed from negative to positive. When the pyrolysis temperature was 300℃ or 400℃, the C_ox of the biochars was negative, indicating that the biochars was more reductive and less oxidizable than those prepared at 500~700℃, i.e., higher electron donating capacity (EDC) and lower electron accepting capacity (EAC). In addition, Fourier transform infrared spectroscopy showed that the hydroxyl content of the biochars was highest at 300℃ and 400℃, which was consistent with their highest EDC.
- bamboo-based biochar /
- pyrolysis temperature /
- electron exchange capacity

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