School of Advanced Energy, Sun Yat-sen University, 66 Gongchang Road, Guangming District, Shenzhen, Guangdong 518107, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China.
Bioresour Technol. 2023 Oct;386:129543. doi: 10.1016/j.biortech.2023.129543. Epub 2023 Jul 22.
Pyrolysis vapor is an important byproduct in the production of biochar from biomass waste, and its emission may pose potential environmental risks. To achieve green production of biochar and efficient utilization of pyrolysis vapors, a novel strategy is proposed in this study to use pristine biochar as an adsorbent to adsorb the pyrolysis vapors. According to thermogravimetry-Fourier infrared spectroscopy-mass spectrometry evaluation, the evolved vapors mainly consisted of oxygenated compounds, hydrocarbons, CO, CO, and HO. With pyrolysis temperature increasing, ethers, phenols, hydrocarbons, acids/ketones, and CO were changed in the same direction based on two-dimensional correlation spectroscopy analysis. Moreover, butene, propargyl alcohol, and butane were the most abundant ionic fragments. After adsorbing pyrolysis vapors, the heating value of the biochar increased by a maximum of 3.2 MJ kg with changes of physicochemical properties. This strategy provides a theoretical basis for green preparation of biochar while recovering energy from pyrolysis vapors.
热解蒸汽是生物质废弃物制备生物炭过程中的一种重要副产物，其排放可能会带来潜在的环境风险。为了实现生物炭的绿色生产和热解蒸汽的高效利用，本研究提出了一种新策略，即用原始生物炭作为吸附剂来吸附热解蒸汽。根据热重-傅里叶变换红外光谱-质谱评估，所产生的蒸汽主要由含氧化合物、碳氢化合物、CO、CO 和 HO 组成。随着热解温度的升高，根据二维相关光谱分析，醚类、酚类、碳氢化合物、酸/酮和 CO 呈同向变化。此外，丁烯、丙炔醇和丁烷是最丰富的离子碎片。吸附热解蒸汽后，生物炭的热值最高增加了 3.2 MJ/kg，同时其物理化学性质也发生了变化。该策略为绿色制备生物炭的同时回收热解蒸汽中的能量提供了理论依据。
