Photochemical behavior of dissolved organic matter derived from Alternanthera philoxeroides hydrochar: Insights from molecular transformation and photochemically reactive intermediates
文献类型： 外文期刊
作者： Gu, Xincai 1 ; Chen, Bingfa 2 ; Liu, Hong 1 ; Feng, Yanfang 2 ; Wang, Bingyu 3 ; He, Shiying 2 ; Feng, Muhua 4 ; Pan, Guojun 2 ; Han, Shiqun 2 ;
作者机构： 1.Suzhou Univ Sci & Technol, Sch Environm Sci & Engn, Jiangsu Key Lab Environm Sci & Technol, Suzhou 215009, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China
3.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources Re, Nanjing 210094, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China
关键词： Hydrochar; Dissolved organic matter; Photochemical behavior; Photochemically reactive intermediates; Molecular transformation
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）
ISSN： 0304-3894
年卷期： 2024 年 461 卷
页码：
收录情况： SCI
摘要： Hydrochar-derived dissolved organic matter (HDOM) enters aquatic ecosystems through soil leaching and surface runoff following the application of hydrochar. However, the photochemical behavior of HDOM remains unclear. The photo-transformation of HDOM was analyzed by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), multiple spectroscopy methods, high-performance liquid chromatography, and combining synchronous fluorescence and Fourier-transform infrared spectroscopy with two-dimensional correlation spectroscopy. The results showed that with the increase of carbonization temperature, amide II in proteinlike substances were observed to be preferentially photolyzed, and the protein-like substances were more sensitive to low irradiation time, while the duration time of the photochemical behavior of amide II and aliphatic C-H were more persistent. FT-ICR MS results showed that N and S-containing molecules, including lignins and lipids were more sensitive to ultraviolet irradiation. Furthermore, the photo-transformation of HDOMs was accompanied by the generation of triple excited state dissolved organic matter and singlet oxygen. Our findings will be beneficial for understanding the mechanisms of photo-transformation of HDOM and for predicting the possible behaviors of hydrochar produced at different temperatures before large-scale application.
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