Insights into the molecular transformation in the dissolved organic compounds of agro-waste-hydrochars by microbial-aging using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry
Insights into the molecular transformation in the dissolved organic compounds of agro-waste-hydrochars by microbial-aging using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry
复制标题
使用电喷雾电离傅里叶变换离子回旋共振质谱法深入了解微生物老化导致的农业废弃物氢炭溶解有机化合物的分子转化
DOI：
10.1016/j.biortech.2020.124411
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发表时间：
2021
影响因子：
11.4
通讯作者：
Xing Baoshan
中科院分区：
文献类型：
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作者：
Chu Qingnan;Xue Lihong;Wang Bingyu;Li Detian;He Huayong;Feng Yanfang;Han Lanfang;Yang Linzhang;Xing Baoshan
以水炭为基质的溶解性有机物（DOM）易被生物体利用，作为环境改良剂对生物区系有重要影响。因此，在水炭应用前，对DOM的分子组成进行积极的修饰是必不可少的。本文系统研究了厌氧发酵微生物老化对农业废弃物-水焦DOM的影响。结果表明，微生物老化导致DOM释放量降低，但DOM分子多样性增加。此外，微生物老化导致更多的可生物降解的化合物，包括脂质和蛋白质的生产，并降低了DOM的芳香性。高含氧分子（O/C > 0.6）在水炭DOM中发生了向低级分子的迁移，表明亲水性化合物向疏水性化合物的转化。此外，微生物老化促进了热解炭DOM中酚类、酚酸和多环芳烃的降解，降解率分别为99.0%~ 98.9%、37.8%~ 73.5%和83.4%~ 90.4%。总体而言，这项研究表明，微生物老化以积极的方式改变了基于碳氢化合物的DOM的分子特征。
Hydrochars-based dissolved organic matters (DOM) are easily available to organisms and thus have important influence on the biota once applying hydrochars as environment amendment. Thus, positive modifications on molecular composition of DOM is indispensable before hydrochars application. In this study, the impacts of microbial-aging by anaerobic fermentation on DOM of agro-waste-hydrochars was systematically assessed. Results revealed that microbial-aging caused lower DOM release but higher DOM molecular diversity. Moreover, microbial-aging resulted in the production of more biodegradable compounds, including lipids and proteins, and reduced the aromaticity of DOM. The highly oxygenated molecules (O/C > 0.6) were shifted into lower-order ones in the hydrochars-based DOM, suggesting the transformation of hydrophilic compounds into hydrophobic ones. Additionally, microbial-aging promoted the degradation of phenols by 99.0–98.9%, phenolic acids 37.8–73.5%, and polycyclic aromatic hydrocarbons by 83.4–90.4% in hydrochar-based DOM. Overall, this study demonstrates that microbial-aging changes the molecular characteristics of hydrochars-based DOM in a positive manner.