Related Experiment Video
Updated: Sep 24, 2025
12:55
Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
17.9K
A comparative study on the structural features of humic acids extracted from lignites using comprehensive spectral
Yuanqin Zhang1, Yanhong Li1,2, Liping Chang2
1Faculty of Chemical Engineering, Kunming University of Science and Technology Kunming 650500 People's Republic of China liyh_2004@163.com +86 159 2523 6990.
RSC Advances
|May 6, 2022
Summary
Humic acids (HAs) from Zhaotong and Mile lignites were structurally analyzed. Zhaotong humic acids (ZLHA) exhibit higher aromaticity and oxygen-containing groups than Mile humic acids (MLHA).
Area of Science:
- Geochemistry
- Organic Chemistry
- Materials Science
Background:
- Abundant lignite reserves in Zhaotong and Mile, China, with limited utilization.
- Humic acids (HAs) extracted from lignite have diverse applications in agriculture and environmental protection.
- Understanding HA structure is crucial for optimizing their use.
Purpose of the Study:
- To characterize and compare the structures of humic acids extracted from Zhaotong lignite (ZLHA) and Mile lignite (MLHA).
- To investigate the potential of comprehensive spectral analyses for HA structural determination.
- To provide a reference for the application of ZLHA and MLHA.
Main Methods:
- Comprehensive spectral analyses including UV-Vis spectroscopy.
- Cross-polarization magic-angle spinning 13C Nuclear Magnetic Resonance (CP-MAS 13C NMR).
- Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS).
Main Results:
- UV-Vis analysis indicated MLHA has a larger molecular weight than ZLHA.
- CP-MAS 13C NMR and FT-IR revealed ZLHA possesses higher aromaticity and oxygen-containing functional groups than MLHA.
- XRD confirmed the aromaticity, and XPS provided insights into elemental composition and forms.
Conclusions:
- Comprehensive spectral analyses effectively elucidated the structural differences between ZLHA and MLHA.
- ZLHA and MLHA exhibit distinct structural characteristics, influencing their potential applications.
- This study provides foundational data for the targeted utilization of Zhaotong and Mile humic acids.
