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Functionalization of Filter Media for Improved Crystalline Silica Analysis Using Raman Spectroscopy



Details

  • Personal Author:
  • Description:
    Respirable crystalline silica (RCS) poses significant health risks in workplaces, including underground coal mines, metal and nonmetal mining, construction sites, fire suppression, and oil and gas industries. Raman spectroscopy offers a promising avenue for direct analysis of RCS on sample filters with minimal pretreatment. However, the presence of organic compounds (OC) in the samples can generate fluorescence signals that interfere with RCS measurements, potentially saturating the detector even at short integration times, particularly when using portable Raman instruments. This study explores a novel approach to address these challenges by functionalizing filters with a hydroxyapatite/silver bromide/titanium dioxide (HAT) photocatalyst, facilitating the oxidation and removal of OC using the Raman excitation laser. Photocatalytic degradation experiments conducted on polyvinyl chloride (PVC) filters preloaded with HAT and anatase titanium dioxide (TiO2) particles demonstrated that HAT significantly enhances the degradation of OC, such as oxalic acid, under visible light irradiation compared to TiO2. Additionally, fluorescence interferences were reduced for coal dust samples analyzed on functionalized silver filters using a portable Raman instrument. The efficacy of HAT in OC photocatalytic degradation on silver filters was further confirmed using a benchtop micro-Raman system. Filter functionalization had minimal impact on filtration efficiencies and pressure drops, indicating the feasibility of this approach for improving RCS analysis while maintaining filter performance. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0377-0486
  • Document Type:
    Text
  • Funding:
    Contract
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    55
  • Issue:
    11
  • NIOSHTIC Number:
    nn:20070153
  • Citation:
    J Raman Spectrosc 2024 Nov; 55(11):1190-1198
  • Contact Point Address:
    Xiaoliang Wang, Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada, USA
  • Email:
    xiaoliang.wang@dri.edu
  • CAS Registry Number:
    Quartz (SiO2) (CAS RN 14808-60-7)
  • Federal Fiscal Year:
    2025
  • Performing Organization:
    Desert Research Institute
  • Peer Reviewed:
    True
  • Start Date:
    20210901
  • Source Full Name:
    Journal of Raman Spectroscopy
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:8c50ff9b95b9f7e89ffc31a9f2dfd52308cdf6703108f111c9eb17f035edb98981ba76f2c8fe1cf1cbd50c22ec1c51bfb66b3a7719e0972a2cd873369af119eb
  • Download URL:
  • File Type:
    Filetype[PDF - 1.04 MB ]
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