Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
Department of Civil and Environmental Engineering, University of Delaware, Newark, USA.
Bioresour Technol. 2022 Jul;355:127246. doi: 10.1016/j.biortech.2022.127246. Epub 2022 Apr 28.
Polycyclic aromatic hydrocarbons are toxic byproducts of biochar production. The effects of pyrolysis atmosphere (i.e., N and CO) and temperature (i.e., 300-900 °C) and element doping (i.e., N, B, O, and S) on the production of sixteen high priority polycyclic aromatic hydrocarbons in lignin-based biochar was investigated. N atmosphere at 300 °C produced the highest total polycyclic aromatic hydrocarbon content (1698 ± 50 ng/g). Polycyclic aromatic hydrocarbon formation decreased with increase in temperature (31 ± 15 ng/g at 900 °C). CO atmosphere significantly decreased yield of polycyclic aromatic hydrocarbons. The effects of heteroatom doping on polycyclic aromatic hydrocarbon formation were investigated for the first time in the pyrolysis synthesis of lignin-based biochar. N-, B-, O, N-B-, and N-S-doping of biochar reduced polycyclic aromatic hydrocarbon formation by 90, 85, 87, 97, and 89%, respectively. Results bring new insights into the role of heteroatom-doping and pyrolysis conditions in controlling polycyclic aromatic hydrocarbon formation in biochars.
多环芳烃是生物炭生产中的有毒副产品。研究了热解气氛（即 N 和 CO）和温度（即 300-900°C）以及元素掺杂（即 N、B、O 和 S）对木质素基生物炭中十六种高优先级多环芳烃生成的影响。在 300°C 的 N 气氛下，产生的多环芳烃总量最高（1698±50ng/g）。多环芳烃的形成随着温度的升高而减少（900°C 时为 31±15ng/g）。CO 气氛显著降低了多环芳烃的产率。首次在木质素基生物炭的热解合成中研究了杂原子掺杂对多环芳烃形成的影响。生物炭的 N、B、O、N-B 和 N-S 掺杂分别使多环芳烃的形成减少了 90%、85%、87%、97%和 89%。结果为杂原子掺杂和热解条件在控制生物炭中多环芳烃形成方面的作用提供了新的见解。
