Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Box 191, Beijing 100083, China.
Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Box 191, Beijing 100083, China.
Bioresour Technol. 2021 Jun;329:124907. doi: 10.1016/j.biortech.2021.124907. Epub 2021 Feb 26.
To further explain effects of pyrolysis temperature on physicochemical properties of corn stalk pellet biochar from a new perspective, various lab physicochemical analysis methods combining microcomputed tomography were used to characterize biochar in this study. The results showed that at pyrolysis temperatures from 300 °C to 800 °C, yield of biochar decreased logarithmically with increasing pyrolysis temperature (T); changes of proximate and elemental compositions all showed significant differences, but the change rules were not consistent; high temperature pyrolysis biochar had high stability, high hardness and was convenient for storage and transportation; the proportions of hydroxyl group and amino group were highest in BC800 and BC600, respectively, contributing to the adsorption and removal of pollutants; BC400 had the best combustion performance; X-ray mean attenuation coefficient (XMAC) showed the following correlations, namely, XMAC = 0.003ln(T-285.329) + 0.011 (R = 0.904) and XMAC = -0.031(VM/100) + 0.021*(Ash/100) + 0.027 (R = 0.915). Above results provide important basic data support for development of corn stalk pellet biochar.
为了从新的视角进一步解释热解温度对玉米秸秆颗粒生物炭理化性质的影响，本研究采用了各种实验室理化分析方法并结合微计算机断层扫描技术对生物炭进行了表征。结果表明，在 300°C 至 800°C 的热解温度范围内，生物炭产率随热解温度（T）的升高呈对数下降；工业分析和元素分析的变化均表现出显著差异，但变化规律并不一致；高温热解生物炭稳定性高、硬度高，便于储存和运输；BC800 和 BC600 中羟基和氨基的比例最高，有利于吸附和去除污染物；BC400 的燃烧性能最好；X 射线平均衰减系数（XMAC）与热解温度（T）和灰分（Ash）含量之间存在以下关系，即 XMAC=0.003ln(T-285.329)+0.011（R=0.904）和 XMAC=-0.031(VM/100)+0.021*(Ash/100)+0.027（R=0.915）。上述结果为玉米秸秆颗粒生物炭的开发提供了重要的基础数据支持。
