Terahertz spectral characterization of bituminous coal treated with nitric acid under different conditions

Chaoqi Wang; Yuping Yang

doi:10.1117/12.3044164

5 December 2024 Terahertz spectral characterization of bituminous coal treated with nitric acid under different conditions

Chaoqi Wang, Yuping Yang

Author Affiliations +

Proceedings Volume 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024); 134180B (2024) https://doi.org/10.1117/12.3044164
Event: 15th International Conference on Information Optics and Photonics (CIOP2024), 2024, Xi’an, China

Abstract

This work systematically investigates the impact of nitric acid leaching treatment with various concentrations (1-6 mol/L) on the chemical composition and structural characteristics of coal samples by utilizing Elemental Analysis (EA), Fourier Transform Infrared spectroscopy (FTIR), as well as Terahertz Time-Domain Spectroscopy (THz-TDS). The results indicate a marked reduction in the content of carbon (C), hydrogen (H), and sulfur (S) as the concentration of nitric acid increased, while the proportion of nitrogen (N) and oxygen (O) exhibited a significant rise. FTIR analysis further demonstrated a notable increase in oxygen-containing functional groups, particularly the carboxyl group (-COOH), alongside the emergence of a new functional group, nitro (-NO₂). Additionally, the terahertz absorption displayed a linear growth trend that correlates closely with the increase of the nitric acid concentration, highlighting the sensitivity of the terahertz technique to alterations in elemental composition and chemical structure within the coal samples. Overall, this study elucidates the specific impacts of nitric acid leaching on the chemical composition and structure of coal samples, offering scientific insights and technical support for the advanced processing and utilization of coal resources, as well as for quality control and environmental protection.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Chaoqi Wang and Yuping Yang "Terahertz spectral characterization of bituminous coal treated with nitric acid under different conditions", Proc. SPIE 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024), 134180B (5 December 2024); https://doi.org/10.1117/12.3044164

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KEYWORDS

Absorption

FT-IR spectroscopy

Terahertz radiation

Terahertz spectroscopy

Carbon

Hydrogen

Chemical composition

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