Novel insights into released hydrochar particle derived from typical high nitrogen waste biomass: Special properties, microstructure and formation mechanism
文献类型： 外文期刊
作者： Guo, Wenjing 1 ; Zhang, Zhiyong 1 ; Wang, Bingyu 2 ; Xue, Lihong 1 ; Feng, Yanfang 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain Sci, Expt Stn Arable Land Conservat Jiangsu, Nanjing 210014, Peoples R China
2.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources Re, Nanjing 210094, Peoples R China
关键词： Microsphere; Hydrophobicity; Gaussian model; TG-FTIR-MS; Core-shell structure
期刊名称：WASTE MANAGEMENT （ 影响因子：7.1； 五年影响因子：8.0 ）
ISSN： 0956-053X
年卷期： 2025 年 193 卷
页码：
收录情况： SCI
摘要： Hydrothermal carbonization (HTC) treatment is a promising method to transforming waste biomass into valuable resources and promoting waste recycling, especially for high nitrogen feedstocks. While small-sized hydrochar particle (>= 0.45 mu m) released from its solid product (hydrochar) application demonstrated large knowledge gaps compared with its original hydrochar and "secondary char" from model biomass (like glucose, sucrose, and starch). Thus, hydrochar particles derived from typical high nitrogen biomass, kitchen garbage (KG), and blue-green algae mud (AM), were collected to investigate their basic properties, microstructures and corresponding formation mechanisms. The results were: 1) the micron-sized hydrochar particles with yields as 3.42-7.86 wt% presented special characteristics, i.e., poor porous structures, moderate pH value, negative surface charge and higher surface hydrophobicity (contact angles as 95.00-117.67 degrees) relative to original hydrochar and secondary char; 2) micronuclei aromatic core and hydrophobic hydrothermal polymers (methoxyl groups/alkyl chain with ether and carboxy groups) were identified in these hydrochar microparticles (HMPs) by jointly using differential thermogravimetry (DTG) analysis, Gaussian fitting model and thermogravimetric analysis combined with Fourier transform infrared spectrometry and mass spectrometry (TG-FTIR-MS) analysis; 3) polycondensation/cyclization reactions and Maillard/Mannich reaction in the KGHMPs, as well as solid-solid conversion and Maillard/Mannich reaction, polymerization reaction in AMHMPs core and its shell were proposed as their dominated formation mechanisms. The conclusions of this study indicated strong binding of HMPs with NH4+, metals, and hydrophobic contaminants, and further reinforcing these application effects as soil fertilizer and decontaminant in soil/water for the N conversion, which also significantly depend on HTC temperature and feedstock.
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