Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 68,
  • Issue 7,
  • pp. 749-757
  • (2014)

Structural Characterization of Hydrogen Peroxide-Oxidized Anthracites by X-ray Diffraction, Fourier Transform Infrared Spectroscopy, and Raman Spectra

Not Accessible

Your library or personal account may give you access

Abstract

The structural characteristics of raw coal and hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>)-oxidized coals were investigated using scanning electron microscopy, X-ray diffraction (XRD), Raman spectra, and Fourier transform infrared (FT-IR) spectroscopy. The results indicate that the derivative coals oxidized by H<sub>2</sub>O<sub>2</sub> are improved noticeably in aromaticity and show an increase first and then a decrease up to the highest aromaticity at 24 h. The stacking layer number of crystalline carbon decreases and the aspect ratio (width versus stacking height) increases with an increase in oxidation time. The content of crystalline carbon shows the same change tendency as the aromaticity measured by XRD. The hydroxyl bands of oxidized coals become much stronger due to an increase in soluble fatty acids and alcohols as a result of the oxidation of the aromatic and aliphatic C-H bonds. In addition, the derivative coals display a decrease first and then an increase in the intensity of aliphatic C-H bond and present a diametrically opposite tendency in the aromatic C-H bonds with an increase in oxidation time. There is good agreement with the changes of aromaticity and crystalline carbon content as measured by XRD and Raman spectra. The particle size of oxidized coals (<200 nm in width) shows a significant decrease compared with that of raw coal (1 μm). This study reveals that the optimal oxidation time is ∼24 h for improving the aromaticity and crystalline carbon content of H<sub>2</sub>O<sub>2</sub>-oxidized coals. This process can help us obtain superfine crystalline carbon materials similar to graphite in structure.

PDF Article
More Like This
Label-free detection of hydrogen peroxide-induced oxidative stress in human retinal pigment epithelium cells via laser tweezers Raman spectroscopy

Yang Chen, ZhiQiang Wang, Yan Huang, ShangYuan Feng, ZuCi Zheng, XiuJie Liu, and MengMeng Liu
Biomed. Opt. Express 10(2) 500-513 (2019)

Monitoring sulfur loss in polycrystalline solid solutions of CaS-La2S3 by Raman spectroscopy and X-ray diffraction

Matthew Havel, Alexandros Kostogiannes, W. Taylor Shoulders, Victoria Blair, Daniel McGill, Clara Rivero-Baleine, Rade Bunijevac, Jeffery Eichler, Matthew R. Kincer, Myungkoo Kang, Kathleen A. Richardson, and Romain Gaume
Opt. Mater. Express 13(2) 504-513 (2023)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved