Distribution Characteristics and Ecotoxicity Assessment of Polycyclic Aromatic Hydrocarbons (PAHs) in Hydrothermal Carbonization Products of Corn Stalks
文献类型： 外文期刊
作者： Si, Hongyu 1 ; Ming, Wang 1 ; Chao, Xiao 2 ; Xie, Xiaomei 3 ; Gong, Junhua 3 ; Yang, Lijun 4 ; Peng, Lizeng 5 ; Koschany, Arthur Ernest 1 ; Chen, Xiuxiu 1 ; Yu, Hewei 1 ; Qiang, Yao 5 ; Lu, Jikai 6 ;
作者机构： 1.Qilu Univ Technol, Energy Res Inst, Shandong Acad Sci, Shandong Prov Key Lab Biomass Gasificat Technol, Jinan 250014, Peoples R China
2.Jereh Environm Management Co, Engn Technol Inst, Chengdu 610041, Peoples R China
3.Shikefeng Chem Ind Co Ltd, Linyi 276000, Peoples R China
4.Qingdao Guanbaolin Activated Carbon Co Ltd, Qingdao 266300, Peoples R China
5.Shandong Acad Agr Sci, Jinan 250100, Peoples R China
6.Ocean Univ China, Coll Engn, Qingdao 266100, Peoples R China
关键词： Hydrothermal carbon; Polycyclic aromatic hydrocarbons; Toxic equivalent; Preparation process
期刊名称：BIORESOURCES （ 影响因子：1.6； 五年影响因子：1.7 ）
ISSN： 1930-2126
年卷期： 2025 年 20 卷 3 期
页码：
收录情况： SCI
摘要： Hydrothermal carbonization (HTC) of corn straw causes hydrolysis and pyrolytic reorganization of the carbon skeleton, leading to the formation of polycyclic aromatic hydrocarbons (PAHs). When used as a soil amendment, hydrothermal carbon can lead to soil contamination, increased biotoxicity, and potential harm to ecosystem health. To systematically evaluate PAHs formation mechanisms, single-factor experiments were carried out by treating corn straw under varying temperatures (180 to 300 degrees C) and durations (2 to 6 h) in a closed batch reactor. PAHs were quantified via gas chromatography-mass spectrometry (GC-MS) with deuterated internal standards. Results revealed that total PAHs concentrations increased by 409%, 66.5%, and 68.3% at 180 degrees C, 210 degrees C, and 240 degrees C (4 h and 2 h), respectively, attributed to intensified dehydration and aromatization reactions under subcritical conditions. Conversely, PAHs levels decreased by 80.4% and 78.1% at 270 degrees C and 300 degrees C (4 h and 2 h), likely due to thermal cracking of PAHs macromolecules into low-molecular-weight fragments. Prolonged treatment (6 h and 4 h) reduced PAHs by 62.9 to 70.8% at <= 240 degrees C, suggesting oxidative degradation pathways dominate over pyrolysis under extended residence time. Mechanistic analysis indicated that optimizing HTC at 270 degrees C for 4 h achieves a critical balance between carbonization efficiency and PAHs suppression, providing a feasible strategy to mitigate ecotoxicological risks of hydrothermal carbon in soil remediation.
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