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3 edition of Heterogeneous photocatalytic oxidation of atmospheric trace contaminants found in the catalog.

Heterogeneous photocatalytic oxidation of atmospheric trace contaminants

Heterogeneous photocatalytic oxidation of atmospheric trace contaminants

first semiannual progress report

by

  • 364 Want to read
  • 39 Currently reading

Published by Chemical Engineering Dept., North Carolina State University, National Aeronautics and Space Administration, Ames Research Center in Raleigh, NC, [Moffett Field, Calif.] .
Written in English

    Subjects:
  • Air -- Purification -- Photocatalysis.,
  • Space cabin atmospheres.

  • Edition Notes

    Other titlesFirst semiannual progress report ... for heterogeneous photocatalytic oxidation of atmospheric trace contaminants.
    Statementby David F. Ollis and Jose Peral.
    SeriesNASA contractor report -- NASA CR-188200.
    ContributionsPeral, Jose., Ames Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15382998M

    A Comparison of Photocatalytic Oxidation Reactor Performance for Spacecraft Cabin Trace Contaminant Control Applications Jay L. Perry1, Kenneth R. Frederick2, and Joseph P. Scott3 National Aeronautics and Space Administration, Huntsville, Alabama, , USA and Dana N. Reinemann4 University of Mississippi, University, Mississippi, , USA. Even though heterogeneous photocatalysis appeared in many forms, photodegradation of organic pollutants has recently been the most widely investigated. By far, titania has played a much larger role in this scenario compared to other semiconductor photocatalysts due to its cost effectiveness, inert nature and photostability. Extensive literature analysis has shown many possibilities of. The Solar Industrial Program has developed processes that destroy hazardous substances in or remove them from water and air. The processes of interest in this report are based on the application of heterogeneous photocatalysts, principally titanium dioxide or modifications thereof, but work on other heterogeneous catalysts is included in this compilation. This report continues bibliographies Cited by:


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Heterogeneous photocatalytic oxidation of atmospheric trace contaminants Download PDF EPUB FB2

Add tags for ""Heterogeneous photocatalytic oxidation of atmospheric trace contaminants": NASA research grant final report, period covered: 11/1//30/96".

Be the first. Similar Items. Get this from a library. Final report-- for heterogeneous photocatalytic oxidation of atmospheric trace contaminants. [David F Ollis; United States. National Aeronautics and Space Administration.]. One of the major applications of heterogeneous catalysis is photocatalytic oxidation (PCO) to effect partial or total mineralisation of gas phase or liquid phase contaminants to benign substances.

Even though degradation begins with a partial degradation, the term ‘photocatalytic degradation’ usually refers to complete photocatalytic Cited by: About Photocatalytic Oxidation Air Purification.

Research Studies and Facts. Photocatalytic Oxidiation is an effective way to neutralize many types of airborne bacteria, chemical contaminates and odors.

How Photocatalytic Oxidation Purifies the Air. Principle of heterogeneous photocatalysis. Heterogeneous photocatalysis is a discipline which includes a large variety of reactions: mild or total oxidations, dehydrogenation, hydrogen transfer, O 2 18 –O 2 16 and deuterium-alkane isotopic exchange, metal deposition, water detoxification, gaseous pollutant removal, etc.

In line with the two latter points, it can be considered as one of Cited by: Solar operation of heterogeneous photocatalytic oxidation reactors is looked at as a sustainable process for water Heterogeneous photocatalytic oxidation of atmospheric trace contaminants book wastewater treatment, because it does not consume electric power and chemicals.

When the heterogeneous photocatalytic oxidation is controlled by the gas-phase mass transfer, the oxidation rate increases with the increase of the airflow rate [60]; when the PCO reaction is. The photoelectrochemistry at semiconductor electrodes has been used to design systems for heterogeneous photosynthesis1–7 and photocatalysis8– There has been, however, no attempt at.

Abstract: Photocatalytic water oxidation by persulfate (Na2S2O8)with [Ru(bpy)3] 2+ (bpy=2,2’-bipyridine) as aphoto-catalyst provides astandard protocol to study the catalytic reactivity of water oxidation catalysts.

The yield of evolved oxygen per persulfate is regarded as agood index for the catalytic reactivity because the oxidation of bpy of.

In chemistry, photocatalysis is the acceleration of a photoreaction in the presence of a catalysed photolysis, light is absorbed by an adsorbed substrate. In photogenerated catalysis, the photocatalytic activity (PCA) depends on the ability of the catalyst to create electron–hole pairs, which generate free radicals (e.g.

hydroxyl radicals: •OH) able to undergo secondary reactions. The most important among the Advanced Oxidation Processes is heterogeneous photocatalytic oxidation, often referred to as photocatalysis. This method deals with the oxidation mostly of organic molecules, with the use of a solid catalyst, which is activated by the incidence of radiation of an appropriate by: 8.

TABLE I: Photocatalytic Oxidation of Benzene on Platinized Anatase or Anatase Powdersa The Journal of Physical Chemistry, Vol. 84, No. 24, Izumi et al. time of co 2 phenol illumination, generated, generated, expt no. catalyst h conditions mmol mmol 1 10% platinized anatase 4 illuminated, 0, saturated 5b 10% platinized anatase 19 illuminated, 0, the investigations for indoor air photocatalytic oxidation used this catalyst.

Obee and Brown [44] pioneered reported an investiga-tion of photocatalytic oxidation of VOCs using TiO. for indoor air. In the investigation, an important finding was that competitive adsorption between water and trace contaminants of VOCs has a significant effect File Size: KB. photocatalytic oxidation What is photocatalytic oxidation.

Oxidative decomposition means that if titanium oxide is exposed to light, organic substances on its surface will be broken down by oxidation, eventually forming carbon dioxide and water.

The method proved useful for describing the kinetics of photocatalytic oxidation (PCO) on TiO 2 particles in air for a wide range of substances: ketones, organophosphorus compounds, alkyl sulfides, and chlorinated hydrocarbons.

The range of substances can Cited by: 1. Certain air filters using photocatalytic oxidation have dangerous by-product, study shows Dangerous by-products released by a filter already in commercial use. Heterogeneous Photocatalysis for Selective Formation of High-Value-Added Molecules: Some Chemical and Engineering Aspects F.

Parrino M. Bellardita E. García-López G. Marcì V. Loddo L. Palmisano ACS Catalysis 8 (12),   Kinetics of the gas/solid heterogeneous photocatalytic oxidation of dilute trichloroethylene (TCE) vapors by ultraviolet-illuminated titanium dioxide have been determined using a fixed-bed dynamic photoreactor.

Reaction rate dependences on inlet TCE, oxygen and water vapor concentrations were found to consist of both reactant sensitive and insensitive by: Heterogeneous photocatalytic oxidation of atmospheric trace contaminants [microform]: first semiannual Fourth semiannual progress report for "Heterogeneous photocatalytic oxidation of atmospheric trace c Photoelectrochemistry, photocatalysis, and photoreactors.

What is Photocatalytic Oxidation. At Genesis Air, we utilize state-of-the-art technology to reduce airborne particles responsible for poor air quality. We achieve outstanding results by using an advanced process called photocatalytic oxidation.

Homogeneous and Heterogeneous Photocatalytic Water Oxidation by Persulfate. A variety of metal complexes act as catalysts in the photocatalytic water oxidation by persulfate with [Ru(bpy)3 ](2+) as a photocatalyst. Herein, the catalytic mechanisms are discussed for homogeneous water oxidation catalysis.

Some metal complexes are converted to Cited by: 2. Principle of Photocatalytic Oxidation Process In the photocatalytic oxidation process, organic pollutants are destroyed in the presence of semiconductor photocatalysts (e.g., TiO 2, ZnO) an energetic light source, and an oxidising agent such as oxygen or air.

Author(s): Ollis,D F; North Carolina State University, Raleigh. Chemical Engineering Department. Title(s): Heterogeneous photocatalytic oxidation of atmospheric trace contaminants.

use of semiconductors in photocatalytic oxidation (PCO) of organic contaminants to produce innocuous CO2 and H20 [1, 6, 7]. The primary advantages ofPCO over the aforementioned technologies are the use of non-expendable materials and low energy demand because the process operates at File Size: 7MB.

Heterogeneous Photocatalytic Removal of Hazardous Compounds from Water and Air Update Number 4 to October November • NREL/TP Daniel M. Blake National Renewable Energy Laboratory Cole Boulevard Golden, Colorado.

Abstract: Photocatalytic water oxidation by persulfate (Na2S2O8) with [Ru(bpy)3]2+ (bpy=2,2′‐bipyridine) as a photocatalyst provides a standard protocol to study the catalytic reactivity of water oxidation catalysts. The yield of evolved oxygen per persulfate is regarded as a good index for the catalytic reactivity because the oxidation of bpy of [Ru(bpy)3]2+ and organic ligands of Cited by: photocatalytic process.

The net process involves oxidizing the organic compound to an intermediate stage of oxygen content or to carbon dioxide, water, and a mineral acid (if a heteroatom such as nitrogen 1Blake, Daniel M.

Bibliography of Work on the Photocatalytic Removal of Hazardous Compounds from Water and Air. NREL/TP Heterogeneous Water Oxidation [clarification needed].

Water oxidation is one of the half reactions of water splitting. 2H 2 O → O 2 + 4H + + 4e − Oxidation (generation of dioxygen). 4H + + 4e − → 2H 2 Reduction (generation of dihydrogen). 2H 2 O → 2H 2 + O 2 Total Reaction.

Of the two half reactions, the oxidation step is the most demanding because it requires the coupling of 4. Final Report: Photocatalytic AIR Cleaner for Indoor Air Pollution Control EPA Contract Number: 68D Title: Photocatalytic AIR Cleaner for Indoor Air Pollution Control Investigators: Kittrell, J.

Small Business: KSE Inc. EPA Contact: Phase: I Project Period: September 1, through March 1, Project Amount: $70, RFA: Small Business Innovation Research (SBIR) - Phase I (). Food & Beverage - Photocatalytic Oxidation. Photocatalytic Oxidation (PCO) is the process of generating free radicals (in our case, hydroxyl radicals OH molecules) by exposing a catalyst to an energy source.

This process is extremely effective in destroying airborne contaminants like VOCs, bacteria, viruses, and other common pathogens. Photocatalytic Water Oxidation on TiO 2-B/RGO.

New Design Criteria of Ternary Oxides for Photocatalytic Applications. Synthesis and Characterization of PbCrO 4 Rods. Photocatalytic Water Oxidation on PbCrO.

The photocatalytic oxidation of trace contaminants such as human metabolite gas and outgas from the component materials over a UV-illuminated film of titanium dioxide (TiO 2) has been studied to apply for an environmental purification in manned trace contaminants studied were as follows: methanol, ethanol, acetal-dehyde, toluene, acetone, methane, ethylene, ammonia, Cited by: 2.

( to nm) and photo-Fenton heterogeneous photocatalysis uses sunlight up to nm. Sunlight at wavelengths over nm is normally not useful. Nevertheless, the specific hardware needed for solar photocatalytic applications has much in common with those used for thermal applications.

Theoretical Insights into Heterogeneous (Photo)electrochemical CO2 Reduction. Chemical ReviewsArticle ASAP. Qian-Qian Bi, Jia-Wei Wang, Jia-Xin Lv, Juan Wang, Wen Zhang, Tong-Bu Lu. Selective Photocatalytic CO2 Reduction in Water by Electrostatic Assembly of CdS Nanocrystals with a Dinuclear Cobalt by: The photocatalytic air purifier is based on photocatalytic oxidation (PCO), an emerging air purifier technology that converts fine (UP to.1 micron) particles (NOT larger particulate) and toxic gasses into safer compounds.

A REVIEW OF SOLAR PHOTOCATALYTIC DEGRADATION OF WASTEWATER If the concentration of Fe is less; then this regenera-tion step is rate determining step for the reaction. The addition of H 2 O 2 in enhances both the homog-enous photocatalysis and TiO 2 photocatalysis.

The H 2 O 2 can hinder the generation of e--h pair but creates additional Cited by: 2. Heterogeneous photocatalytic oxidation of gas-phase organics for air purification: Acetone, 1-butanol, butyraldehyde, formaldehyde, and m-xylene oxidation.

heterogeneous photocatalytic regime as demonstrated further. The photoefficiency can be reduced by the electron-hole recombination, described in Fig. 2, which corresponds to the degradation of the photo-electric energy into heat.

e− CpC. N CE (4) where N is the neutral center and E the energy released under the form of light (h 0 h) or of. One component of human life support, trace contaminant control, presently relies on non regenerative charcoal adsorption.

Photocatalytic oxidation holds great promise as a regenerative alternative to charcoal adsorption. It operates at ambient temperature, oxidizes a wide variety of organics, and has rapid destruction kinetics at low Cited by: 5.

Heterogeneous photocatalysis using semiconductors is one of the encouraging ad-vanced oxidation processes. Due to its high photocatalytic activity, semiconductor-as-sisted photocatalysis have been found to be an effective process for the elimination of contaminants in wastewaters [12–14].

Among several semiconductors, TiO2 and ZnO. Many air purifier manufacturers are now utilizing Photocatalytic Oxidation (PCO) technology as a way of removing toxins from the air. This air purification method may be the most advanced one yet, and some leading air purifier manufacturers are beginning to add PCO air cleaners to their product lines.Heterogeneous Photocatalytic Oxidation an Effective Tool for Wastewater Treatment – A Review.

By Cheng Chee Kaan, Azrina Abd Aziz, Shaliza Ibrahim, Manickam Matheswaran and Pichiah Saravanan. Submitted: March 15th Reviewed: August 30th Cited by: Heterogeneous photocatalytic oxidation has potential applications for the treatment of waste water with dilute concentration of organic compounds because it effectively oxidizes a large number of chemical pollutants.

Among the most popular semiconductors studied, TiO 2 is one of the best by: