2004 Progress Report: Visible-Light-Responsive Titania Modified with Aerogel/Ferroelectric Optical Materials for VOC Oxidation

EPA Grant Number: R831276C004
Subproject: this is subproject number 004 , established and managed by the Center Director under grant CR831276
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).

Center: Gulf Coast HSRC (Lamar)
Center Director: Ho, Tho C.
Title: Visible-Light-Responsive Titania Modified with Aerogel/Ferroelectric Optical Materials for VOC Oxidation
Investigators: Chen, Daniel , Li, Ku-Yen
Institution: Lamar University
EPA Project Officer: Lasat, Mitch
Project Period: December 1, 2003 through November 30, 2004
Project Period Covered by this Report: December 1, 2003 through November 30, 2004
Project Amount: Refer to main center abstract for funding details.
RFA: Gulf Coast Hazardous Substance Research Center (Lamar University) (1996) RFA Text |  Recipients Lists
Research Category: Hazardous Waste/Remediation , Targeted Research

Objective:

Volatile organic compounds (VOCs), the precursors of ground-level ozone and particulate, pose major threats to the air quality of many Texas metropolitan areas. Photocatalytic oxidation has gained much attention in air/water pollution control because of the potential to use solar energy. Photocatalysis utilizes near-UV light to break down organic pollutants into innocuous compounds at room temperatures. Our project deals with the destruction of VOCs using titania photocatalytic oxidation (PCO), which has the potential to become a commercialized advanced oxidation technology, especially in low-concentration, low-flow rate, and noncentralized applications. The low light and photon utilization efficiency, however, hinders its widespread use. The objectives of this research project are to: (1) use aerogel TiO2 powder to increase the porosity and surface area of the visible-light-responsive (VLR) TiO2; (2) use the transparent optical crystals to guide UV/visible light into the catalyst interiors; and (3) characterize the modified VLR TiO2 to determine the properties that may be responsible for the enhancement.

Progress Summary:

We have made significant progress during Year 1 of the project. Two types of VLR TiO2 have been tested: NTB200 and BA-PW25. NTB200 is made by Showa Denko K.K, and BA-PW25 is developed by Ecodevice, both from Japan. NTB200 is made mainly of brookite TiO2. Two kinds of enhancement techniques have been tested: ferroelectric crystal LiNbO3 and aerogel additives. Among many light sources, cool white fluorescent light is closest to the sunlight spectrum. Light emitting diode (LED) offering almost a single wavelength of light is used to identify the effective wavelength range for each photocatalyst. Under fluorescent light, aerogel, Degussa P-25, and VLR TiO2 all show a PCO ability. Aerogel gives the best performance. There is significant enhancement to BA-PW25 with 0.1 percent (w/w) LiNbO3 (16% increase in butyraldehyde conversion). There is a maximum in conversion of butyraldehyde in the presence of humid air. The conversion increases to 50 percent from 31 percent as humidity is increased from 0 percent to 20 percent, and after that, there is a drop in conversion at humidity between 20 percent and 40 percent. NTB200 is characterized with X-ray diffraction (XRD) and shows mainly the brookite structure.

We are testing the Oriel solar simulator with filters (> 400 nm) to verify the activity of the VLR catalysts beyond fluorescent light. Preliminary results using BA-PW25 show positive photocatalytic activity. Future plans also call for testing ferroelectric crystals (LiNbO3/BaTiO2) enhancements to VLR TiO2 using butyraldehyde as a model compound.

Future Activities:

Future activities include: (1) continuing to test VLR photocatalysts with filters that cut wavelength less than 400 nm; (2) testing enhancement with BaTiO3 and LiNbO3 under visible light irradiation; and (3) seeking VLR photocatalysts other than NTB200 and BA-PW25.


Journal Articles on this Report : 2 Displayed | Download in RIS Format

Other subproject views: All 3 publications 2 publications in selected types All 2 journal articles
Other center views: All 64 publications 19 publications in selected types All 18 journal articles
Type Citation Sub Project Document Sources
Journal Article Chen DH, Ye X, Li K. Oxidation of PCE with a UV LED photocatalytic reactor. Chemical Engineering & Technology 2005;28(1):95-97. CR831276 (Final)
R831276C004 (2004)
R828598 (Final)
R828598C744 (Final)
  • Abstract: Wiley Online - Abstract
    Exit
  • Journal Article Huang C, Chen DH, Li K. Photocatalytic oxidation of butyraldehyde over titania in air: by-product identification and reaction pathways. Chemical Engineering Communications 2003;190(3):373-392. CR831276 (Final)
    R831276C004 (2004)
    R828598 (Final)
    R828598C744 (2001)
  • Abstract: Taylor&Francis - Abstract
    Exit
  • Supplemental Keywords:

    waste, ecological risk assessment, environmental engineering, hazardous waste, advanced treatment technologies, bioremediation, contaminated waste sites, groundwater contamination, petroleum contaminants, hydrocarbon,, RFA, Scientific Discipline, Air, INTERNATIONAL COOPERATION, Waste, POLLUTANTS/TOXICS, air toxics, Environmental Chemistry, Chemicals, Hazardous Waste, Hazardous, Engineering, Chemistry, & Physics, Environmental Engineering, emission control strategies, hazardous waste treatment, advanced treatment technologies, mass spectrometry, emission control technologies, VOCs, air pollution control, VOC removal, emissions, gas chromatography, aerogel catalysts, visible light responsive titania, photocatalytic oxidation, VOC emission controls, air pollution control technology, Volatile Organic Compounds (VOCs), air emissions, emissions contol engineering, atmospheric mercury chemistry

    Relevant Websites:

    http://dept.lamar.edu/gchsrc/ Exit

    Progress and Final Reports:

    Original Abstract
  • Final

  • Main Center Abstract and Reports:

    CR831276    Gulf Coast HSRC (Lamar)

    Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
    R831276C001 DNAPL Source Control by Reductive Dechlorination with Fe(II)
    R831276C002 Arsenic Removal and Stabilization with Synthesized Pyrite
    R831276C003 A Large-Scale Experimental Investigation of the Impact of Ethanol on Groundwater Contamination
    R831276C004 Visible-Light-Responsive Titania Modified with Aerogel/Ferroelectric Optical Materials for VOC Oxidation
    R831276C005 Development of a Microwave-Induced On-Site Regeneration Technology for Advancing the Control of Mercury and VOC Emissions Employing Activated Carbon
    R831276C006 Pollution Prevention through Functionality Tracking and Property Integration
    R831276C007 Compact Nephelometer System for On-Line Monitoring of Particulate Matter Emissions
    R831276C008 Effect of Pitting Corrosion Promoters on the Treatment of Waters Contaminated with a Nitroaromatic Compounds Using Integrated Reductive/Oxidative Processes
    R831276C009 Linear Polymer Chain and Bioengineered Chelators for Metals Remediation
    R831276C010 Treatment of Perchlorate Contaminated Water Using a Combined Biotic/Abiotic Process
    R831276C011 Rapid Determination of Microbial Pathways for Pollutant Degradation
    R831276C012 Simulations of the Emission, Transport, Chemistry and Deposition of Atmospheric Mercury in the Upper Gulf Coast Region
    R831276C013 Reduction of Environmental Impact and Improvement of Intrinsic Security in Unsteady-state
    R831276C014 Integrated Chemical Complex and Cogeneration Analysis System: Greenhouse Gas Management and Pollution Prevention Solutions
    R831276C015 Improved Combustion Catalysts for NOx Emission Reduction
    R831276C016 A Large-Scale Experimental Investigation of the Impact of Ethanol on Groundwater Contamination
    R831276C017 Minimization of Hazardous Ion-Exchange Brine Waste by Biological Treatment of Perchlorate and Nitrate to Allow Brine Recycle
    R831276C018 Integrated Chemical Complex and Cogeneration Analysis System: Greenhouse Gas Management and Pollution Prevention Solutions