Preparation and structural analysis of humic acid by co-thermal oxidation of wheat straw and Heilongjiang lignite

被引：0

作者：

Li Y.-L. ^{[1
]}

Chen X. ^{[1
]}

Zhang C.-Q. ^{[2
]}

Li X.-F. ^{[2
]}

Liu P. ^{[1
]}

Chen W.-X. ^{[1
]}

Ren S.-X. ^{[1
]}

Lei T.-Z. ^{[1
]}

机构：

[1] Institute of Urban and Rural Mines, Changzhou University, Changzhou

[2] National Institute of Clean-and-low-carbon Energy, Beijing

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2023年 / 51卷 / 02期

基金：

中国国家自然科学基金;

关键词：

!sup]13[!/sup]CNMR; biomass; co-thermal oxidation; humic acid; lignite;

D O I：

10.1016/S1872-5813(22)60033-1

中图分类号：

学科分类号：

摘要：

Combining with the characteristics of high yield of mineral humic acid (HA) and high activity of biochemical HA, co-thermal oxidation of low rank coal and biomass to produce complex HA (MIXHA) was newly proposed. The mixture (MIX) of Heilongjiang lignite (HL) and wheat straw (WS) was co-thermally oxidized in 10% HNO3 solution to prepare MIXHA. This work focused on comparison of the macro morphology and microstructure of MIXHA between HLHA and WSHA by SEM, FT-IR and 13C NMR analyses, and explored the synergistic effect between HL and WS during the co-thermal oxidation process. The results show that MIXHA content is higher than the theoretical value. Decomposition of HNO3 molecular produces active oxygen atoms and nitrogen oxides to attack the molecular structure of WS and HL. Due to hydrogen bond rearrangement, glycosidic bond rupture, and crosslinking, plenty of alkyl radicals generated in WS are combined with the condensation aromatic ring in HL. Thus, the protonated aromatic carbon is changed into aliphatic substituted aromatic carbon. The obtained MIXHA is rich in oxygen-containing functional groups, and has high activity. Obvious characteristic peaks are observed in FTIR spectra of MIXHA. This work would provide a new idea for classification and resource utilization of low-rank coal and agricultural and forestry wastes. © 2023 Science Press. All rights reserved.

引用

页码：145 / 154

页数：9

共 34 条

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