Experimental and Modeling Study of Visible Light Responsive Photocatalytic Oxidation (PCO) Materials for Toluene Degradation

Details

• Personal Author:
  Bartlett BM ; Batterman S ; Brancho JJ ; Godwin C ; Zhong L
• Description:
  Only limited research has examined the development and application of visible light responsive photocatalytic oxidation (PCO), although such materials have great potential for mitigating concentrations of volatile organic compounds (VOCs) when applied to building surfaces. This study evaluates the performance and characteristics of a visible light responsive photocatalyst, specially, a co-alloyed TiNbON compound with a band energy of 2.3 eV. The PCO material was developed using urea-glass synthesis, characterized by scanning electron microscopy (SEM), diffuse reflectance spectra (DRS), powder X-ray diffraction (PXRD), and Brunauer-Emmett-Teller (BET) methods, and VOC removal efficiency was measured under visible light for toluene (1-5 ppm) at room temperature (21.5 degrees C) and a range of relative humidity (RH: 25 to 65%), flow rate (0.78 to 7.84 cm/s), and irradiance (42 to 95 W/m2). A systematic parametric evaluation of kinetic parameters was conducted. In addition, we compared TiNbON with a commercial TiO2-based material under black light, estimated TiNbON's long-term durability and stability, and tested its ability to thermally regenerate. Using mass transfer and kinetic analysis, three different Langmuir-Hinshelwood (LH) type reaction rate expressions were proposed and evaluated. A LH model considering one active site and competitive sorption of toluene and water was superior to others. The visible-light driven catalyst was able to remove up to 58% of the toluene, generated less formaldehyde than the commercial TiO2, could be fully regenerated at 150 degrees C, and had reasonable durability and stability. This evaluation of TiNbON shows the potential to remove VOCs and improve air quality for indoor applications. Further research is needed to evaluate the potential for harmful by-products, to identify optimal conditions, and to use field tests to show real-world performance. [Description provided by NIOSH]
• Subjects:
  Aerosols Chemistry Coal Coal Mining Fires Fuel Oils Laboratories Microbiology Mining Occupational Health Safety

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• Keywords:
  Air Quality Author Keywords: Photocatalytic Oxidation Electron Microscopy Formaldehyde Humidity IAQ Indoor Air Quality Indoor Environments Kinetics Light Properties Models Oxidation PCO Toluenes Visible Light VOCs Volatile Organic Compounds X-ray Diffraction

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• ISSN:
  0926-3373
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Michigan ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  122-132
• Volume:
  216
• NIOSHTIC Number:
  nn:20051691
• Citation:
  Appl Catal B 2017 Nov; 216:122-132
• Contact Point Address:
  Stuart Battermana, M6075 SPH II, 1415 Washington Heights, Ann Arbor, MI 48109-2029
• Email:
  stuartb@umich.edu
• CAS Registry Number:
  Formaldehyde (CAS RN 50-00-0) ; Toluene (CAS RN 108-88-3)
• Federal Fiscal Year:
  2018
• Performing Organization:
  University of Michigan, Ann Arbor
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Applied Catalysis B: Environmental
• End Date:
  20280630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:41b5a24db21ee64a4846101a7c33f0598c624cb689ebbf153b12725986465118775e96e5c1520d4c54094b35a8558e9b680d795199e6c87448badd3b52c19a5d
• Download URL:
  https://stacks.cdc.gov/view/cdc/211510/cdc_211510_DS1.pdf
• File Type:
  [PDF - 2.35 MB ]