Liu Xinran, Wei Lihong, Jiang Jinyuan, He Changjun, Sun Xun, Song Haoyang
College of Energy and Environment, Shenyang Aerospace University, No.37 Daoyi Southstreet, Shenbei New District, Shenyang, 110122, China.
Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environment Sciences, No. 8 An Wai Da Yang Fang, Chaoyang District, Beijing, 100012, China.
Environ Sci Pollut Res Int. 2024 Mar;31(12):18527-18539. doi: 10.1007/s11356-024-32240-1. Epub 2024 Feb 12.
Dissolved organic matter (DOM) derived from biochar takes a crucial role in transport and bioavailability toward contaminants; hence, it is undeniable that a thorough analysis of its properties is important. So far, the effect of pyrolysis temperature on the functional groups, components, and evolutionary sequence of manure-based biochar DOM has not been adequately investigated. Here, DOM was released from two typical livestock manures (cow and pig) at five pyrolysis temperatures (300 ~ 700°C), and it was explored in depth with the aid of moving window 2D correlation spectroscopy (MW-2D-COS) and heterogeneous 2D correlation spectroscopy (hetero-2D-COS). The results demonstrated that the concentration, aromaticity, and hydrophobicity of DOM were greater at high temperatures, and more DOM was liberated from cow manure-based biochar at identical temperature. Protein-like compounds dominated at high temperatures. The pyrolysis temperatures of final configuration transformation points of the fulvic acid-like component and the aromatic ring C=C in DOM were 400°C and 500°C, respectively. Moreover, Fourier transform infrared spectroscopy combined with two-dimensional correlation analysis indicated that the functional group evolution of DOM depends on the pyrolysis temperature and feedstock type. The study provides a new perspective on manure management and environmental applications of biochar.
源自生物炭的溶解有机物（DOM）在污染物的迁移和生物可利用性方面起着关键作用；因此，对其性质进行全面分析的重要性是不可否认的。到目前为止，热解温度对基于粪便的生物炭DOM的官能团、成分和演化顺序的影响尚未得到充分研究。在此，在五个热解温度（300~700°C）下从两种典型的家畜粪便（牛粪和猪粪）中释放出DOM，并借助移动窗口二维相关光谱（MW-2D-COS）和异质二维相关光谱（hetero-2D-COS）对其进行深入探究。结果表明，高温下DOM的浓度、芳香性和疏水性更高，并且在相同温度下从牛粪基生物炭中释放出的DOM更多。高温下以类蛋白质化合物为主。DOM中类富里酸成分和芳香环C=C的最终构型转变点的热解温度分别为400°C和500°C。此外，傅里叶变换红外光谱结合二维相关分析表明，DOM的官能团演化取决于热解温度和原料类型。该研究为粪便管理和生物炭的环境应用提供了新的视角。
