Wang Miao, Li Yanhong, Zhang Yuanqin, Hu Xun, Li Qingyin, Su Yi, Zhao Wenbo
Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
ACS Omega. 2021 Sep 9;6(37):24051-24061. doi: 10.1021/acsomega.1c03257. eCollection 2021 Sep 21.
To study the effect of HO on the content and properties of humic acids (HAs) in lignites, the experimental conditions including oxidation time, HO concentration, and the solid-liquid ratio were investigated. Under the optimum oxidation conditions, the contents of HAs of YL and HB lignite were 45.4 and 40.9%, respectively. The HAs extracted from oxidized and raw lignites were characterized and compared. The results showed that the HAs extracted from oxidized lignites contain more total acidic groups, carboxyl groups, and aliphatic carbon than that in HAs extracted from raw lignites, and their hydrophilic-hydrophobic index value is higher and thermooxidative stability is better than those in HAs extracted from raw lignites. In addition, the composition of polycyclic aromatic hydrocarbons and fluorophore types in HAs extracted from oxidized lignites are similar to the HAs extracted from raw lignites. The results indicated that the oxidation operation can increase the content of HAs in lignites, and simultaneously increase the content of oxygen-containing functional groups and biological activity of HAs, which provided a reference for the subsequent application of HAs.
为研究过氧化氢（HO）对褐煤中腐殖酸（HAs）含量及性质的影响，考察了氧化时间、HO浓度和固液比等实验条件。在最佳氧化条件下，YL褐煤和HB褐煤的腐殖酸含量分别为45.4%和40.9%。对氧化褐煤和原煤中提取的腐殖酸进行了表征和比较。结果表明，氧化褐煤中提取的腐殖酸比原煤中提取的腐殖酸含有更多的总酸性基团、羧基和脂肪族碳，其亲水-疏水指数值更高，热氧化稳定性比原煤中提取的腐殖酸更好。此外，氧化褐煤中提取的腐殖酸中多环芳烃的组成和荧光团类型与原煤中提取的腐殖酸相似。结果表明，氧化操作可提高褐煤中腐殖酸的含量，同时增加腐殖酸中含氧官能团的含量和生物活性，为腐殖酸的后续应用提供了参考。
