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Topic: Photocatalysis

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	Current Uses of TiO2 Photocatalysis (Site not responding. Last check: 2007-11-03)
		The definition of photocatalysis is basically the acceleration of a photoreaction by the presence of a catalyst.
		In photocatalysis, no energy is stored; there is merely an acceleration of a slow event by a photon- assisted process.
		The best way to cleanse a wastewater would be to use a photocatalysis process that can be effective on a multitude of contaminants or in other words a heterogeneous environment of contaminants.
	ceenve.calpoly.edu /cota/enve436/projects/TiO2b/TiO2-Organics.html (1103 words)

	Photocatalysis
		Photocatalysis is a fantastic way to clean facilities, houses, and living environments.
		Catalysis is the process where a substance participates in modifying the rate of a chemical transformation of the reactants without being altered in the end.
		Hence, photocatalysis is a reaction which uses light to activate a substance which modifies the rate of a chemical reaction without being involved itself.
	dev.nsta.org /evwebs/1952/photocatalysis.htm (208 words)

	Gas-solid photocatalytic oxidation of environmental pollutants - Patent 5045288
		Heterogeneous photocatalysis shows promise as a chemical method that is capable of the complete, room temperature oxidation of volatile organic compounds such as TCE to environmentally innocuous species.
		The major advantage of photocatalysis employed in the present invention is that chemical transformations, which would be difficult or expensive using traditional thermal methods, can be accomplished under relatively mild conditions.
		Volatile species were extracted with the gas-solid heterogeneous photocatalysis reactor hereof by directing a gas stream of pollutants produced by the air stripping of waters containing volatile pollutants into the reactor.
	www.freepatentsonline.com /5045288.html (4323 words)

	Photocatalysis: raising the stakes for IAQ Engineered Systems - Find Articles
		Photocatalysis is an AOT that uses a metal salt catalyst like titanium dioxide (Ti[O.sub.2]) in combination with photolysis from UV light to generate these radicals.
		The recent emergence of photocatalysis in HVAC applications reveals opportunities for building owners, operators, and tenants to enjoy the benefits of sound design choices in several important areas.
		Comparison of facility energy consumption simulations with the case of using photocatalysis under DDC vs. that of control by dilution with fresh air demonstrated an estimated savings of 10.8% in electricity consumption over a one-year period.
	www.findarticles.com /p/articles/mi_m0BPR/is_12_21/ai_n8580913 (808 words)

	Photocatalysis: Innova Air Tech Instruments A/S - gas analyser, green house gas emissions, anaesthetic gas monitoring, ...
		In Figure 1 the main areas of activity in TiO2 photocatalysis are shown.
		As already menthioned, in the last 10 years photocatalysis has become more and more attractive for the industry regarding the development of technologies for purification of water and air.
		Compared with traditional advanced oxidation processes the technology of photocatalysis is known to have some advantages, such as ease of setup and operation at ambient temperatures, no need for postprocesses, low consumption of energy and consequently low cost.
	www.innova.dk /Photocatalysis.pas.0.html (477 words)

	Elimination of organic pollutants from the passenger compartment of a vehicle by photocatalysis - Patent 6468491
		In a technique for eliminating organic pollutants from the passenger compartment of a vehicle by photocatalysis, the upper face of the dashboard is covered with a layer of photocatalyst.
		The invention relates to the elimination of organic pollutants from the air of a motor-vehicle passenger compartment, this vehicle being equipped with a heating, ventilation and/or air-conditioning installation arranged under the dashboard.
		Toxic- or polluting-gas-filtration apparatus for a vehicle passenger compartment is known from EP 0 798 143, this apparatus using photocatalysis as active principle.
	www.freepatentsonline.com /6468491.html (2419 words)

	Titanium Dioxide—Carbon Nanostructure Composites for Enhanced Photocatalysis (Site not responding. Last check: 2007-11-03)
		Photocatalysis using titanium dioxide particles can be applied to wet and dry systems and can also be used for surface disinfection.
		A significant drawback of photocatalysis process is the time required for inactivation, especially for bacterial endospores.
		Enhancement in photocatalysis can be achieved by reducing the recombination of photon generated electron-hole pairs, with subsequent increase in generation of reactive species, such as hydroxyl radicals.
	aiche.confex.com /aiche/s06/techprogram/P38034.HTM (276 words)

	Strathprints - Detoxification of water by semiconductor photocatalysis
		An overview of the use of semiconductor photocatalysis for water purification is given.
		The basic principles of semiconductor photocatalysis are described along with the current understanding of the underlying reaction mechanism(s) and how it fits in with the major features of the observed Langmuir-Hinshelwood-type kinetics of pollutant destruction.
		An attempt is made briefly to compare the efficacy of semiconductor photocatalysis for water purification with that of other, more popular and prevalent water purification processes.
	eprints.cdlr.strath.ac.uk /453 (304 words)

	Cornu, Catherine J. G. (2001-09-24) Photocatalysis under periodic illumination. ... (Site not responding. Last check: 2007-11-03)
		In the first part of this work, the use of periodic illumination is investigated as a means to improve the quantum yield of aqueous phase photocatalysis.
		In the second part of this work, periodic illumination is applied as a tool to investigate the kinetic behavior of the intermediates involved in photocatalysis.
		Two transitions are observed in the quantum yield as a function of the active light period, corresponding to separate lifetimes of two intermediates.
	etd.caltech.edu /etd/available/etd-05082006-143046 (351 words)

	Challenges of Photocatalysis for Water Purification
		Heterogeneous photocatalysis is an attractive alternative treatment method for decontamination of organic compounds and disinfection of microorganisms to purify potable water.
		There is no harmful byproducts produced in the case of photocatalysis and the technology has been proven effective in removing trace amounts of organic compounds from water.
		The study of degrading a substantial number of organics and microorganisms in a small scale shows the potential of the process for domestic use.
	www.ucalgary.ca /~chlangfo/photcat.htm (421 words)

	AutomatedBuildings.com Article - Photocatalysis: Considerations for IAQ-Sensitive Engineering Designs
		Heterogeneous photocatalysis, also referred to as photocatalytic oxidation or PCO, is an emerging advanced oxidizing technology that offers many opportunities for application in the HVAC industry.
		Photocatalysis taking place at the interfacial boundary between two phases (solid-liquid; solid-gas; liquid-gas).
		Photocatalysis is considered to be a sustainable technology in that it functions to improve indoor air quality and minimize building energy usage, and does so without appreciable depletion of the semiconductor photo-catalyst.
	www.automatedbuildings.com /news/apr06/articles/csg/060320110906csg.htm (2246 words)

	Optimizing photocatalytic oxidation for purifying air
		A major benefit of photocatalysis is that, powered by light, it can activate processes not thermally accessible under ambient conditions.
		Photocatalysis in the aqueous phase has also been extensively studied.
		But before photocatalysis can be considered a viable commercial alternative in self-cleaning applications, the issue of deactivation must be resolved.
	newsroom.spie.org /x4110.xml (921 words)

	Photocatalysis of cementitious materials: clean buildings and clean air
		Photocatalysis of cementitious materials: clean buildings and clean air
		Concrete with added functionality - for example, self-cleaning characteristics and the ability to remove pollutants - is desirable.
		Heterogeneous photocatalysis (e.g., gas—solid or liquid—solid catalytic processes caused by light irradiation) by semiconductor particles or coatings has now reached a high level of development and is a promising technology for the reduction of global environmental pollutants.
	www.azobuild.com /details.asp?ArticleID=7815 (170 words)

	Controlled Periodic Illumination in Heterogeneous Photocatalysis
		Heterogeneous photocatalysis is an advanced oxidation process for water and air purification.
		These studies provide extensive insight into photocatalysis, but the field is far from being completely understood.
		Furthermore, as photocatalysis is commercially developed for water purification, more problems have arisen.
	www.calpoly.edu /~ceenve/enve/jsczechowski/research.html (641 words)

	Photocatalysis
		Photocatalysis, the promotion or driving of a chemical reactions by light, is as yet the most commercialized application of semiconductor electrochemistry.
		A new review on the terminology used in photocatalysis ("Suggested terms and definitions in photocatalysis and radiocatalysis") was published by N. Serpone and A. Emeline in International Journal of Photoenergy Vol.
		One of the projects deals with sulfur recovery from oil and gas refinery waste streams where hydrogen sulfide is decomposed to its constituent elements in a photoreactor.
	netserv.ipc.uni-linz.ac.at /~dieter/DsWeb/Research/Detox/0Photocatalysis.htm (1832 words)

	Publisher description for Library of Congress control number 2004065093 (Site not responding. Last check: 2007-11-03)
		Heterogeneous photocatalysis is a novel technique for water purification.
		This is a technique that, according to our extensive experience on the development of laboratory scale and pilot plant units, has great promise to eliminate water and air pollutants.
		Photocatalysis offers much more than competitive techniques where pollutants are transferred from phases; photocatalysis can achieve complete mineralization of pollutants leaving non-toxic species such as CO2 and H2O and can be exploited at close to room temperature and ambient pressure.
	www.loc.gov /catdir/enhancements/fy0663/2004065093-d.html (145 words)

	Photocatalysis on Nano-Sized Photocatalysts (Site not responding. Last check: 2007-11-03)
		Photocatalysis can be defined as the acceleration of a photoreaction by the presence of a catalyst.
		I hope this page has given you a basic understanding of photocatalysis, and the role nanoparticles will play in this field in the future.
		In conclusion, heterogeneous photocatalysis is now approaching a level of understanding where commercial implementation, particularly for environmental applications, can be considered.
	www.rpi.edu /dept/materials/COURSES/NANO/popielarski/index.html (346 words)

	Photocatalysis:Considerations For IAQ-Sensitive Engineering Designs - Feature Article - Engineered Systems (Site not responding. Last check: 2007-11-03)
		An example of the complementary relationship between technologies can be found in the combined use of particulate filtration, photolysis, and photocatalysis.
		Photocatalysis is considered to be a sustainable technology in that it functions to improve IAQ and minimize building energy usage, and does so without appreciable depletion of the semiconductor photocatalyst.
		In certain designs, the opportunity may exist for the LEED point standing to be increased due to the application of this technology to the building design.
	www.esmagazine.com /CDA/Articles/Feature_Article/1f9016fba223a010VgnVCM100000f932a8c0____ (2249 words)

	Research Activities of Kamat Group at Notre Dame
		The advanced oxidation processes such as photocatalysis, radiolysis and sonolysis are useful for degrading undesirable organics from air and water.
		To develop new methodologies (e.g., combining sonolysis and photocatalysis) to improve the rate of degradation and control the fate of reaction pathways leading to mineralization.
		Comapre and contrast the merits of photocatalysis, sonolysis and radiolysis for their effectiveness in the mineralization of organic contaminants and humic substances
	www.nd.edu /~pkamat/environmental.html (733 words)

	Words You Should Know: Depollution, Photocatalysis - Precast Solutions Magazine Summer 2006
		Today, the industry has two new words to get acquainted with, words that may be even more important since they affect not just construction but the very quality of life in our communities: depollution and photocatalysis.
		Making it capable of photocatalysis requires manipulating the material to create extremely fine nano-sized particles with a different atomic structure than that of the ordinary pigment.
		So by applying a few new words like photocatalysis and depollution to your construction vocabulary, you just might hear your clients use that beautiful world: yes.
	www.precast.org /publications/solutions/2006_fall/feature_words.htm (1454 words)

	Airwise Air Purifier
		Airwise uses photocatalysis, a purification process so effective it’s FDA approved for poultry processing (destroys salmonella), pork processing (destroys E. coli).
		The photocatalysis purification process is also widely used to remove pesticides from fruits and vegetables.
		Photocatalysis is equally effective for purifying the air in your home and workplace.
	www.fernsnutrition.com /airwise.html (514 words)

	Studies of surface bound intermediates in UV initiated photocatalysis using solid state NMR spectroscopy
		My research interests are focused on the chemistry of surfaces and the study of advanced materials, primarily through the use of new high resolution solid-state NMR techniques.
		Some results in the area of environmental photocatalysis and thioborate based glassy fast ionic conductors are summarized below.
		Heterogeneous semiconductor photocatalysis represents an emerging area of environmental catalysis with the broadly defined goal of efficiently detoxifying hazardous organic pollutants.
	www.che.caltech.edu /nmr/research.html (412 words)

	Photocatalysis Applications of Titanium Dioxide Ti02 - TitaniumArt.com
		Photocatalysis Applications of Titanium Dioxide Ti02 - TitaniumArt.com
		Titanium dioxide, also known as titania is the naturally occurring oxide of titanium, chemical formula TiO2.
		TiO2 coated tiles in an hospital environment showed the surface bacteria on the wall surfaces were reduced to zero, plus airborne bacteria counts were reduced.
	www.titaniumart.com /photocatalysis-ti02.html (276 words)

	Research on nanopore materials shows potential for industrial photocatalysis applications - Nanowerk LLC
		(PRLEAP.COM) (Nanowerk News) A novel instrument for analyzing porous nanostructures will aid the improvement of photocatalysis, which is an important application in industry, for example for water or air purification.
		The photocatalytic activity of TiO2 depends among other things on the surface area of the catalyst and high photocatalytic activity is associated with high crystallinity and high surface area.
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	www.prleap.com /printer/28727 (519 words)

	Amazon.com: Homogeneous Photocatalysis (Wiley Series in Photoscience & Photoengineering): Books: M. Chanon (Site not responding. Last check: 2007-11-03)
		Photocatalysis and related processes occupy a strategic position for the future of Photochemistry.
		Indeed, applications in solar energy taming, pollution management or other environmental problems and information storage could become practical before the end of this century.
		Homogeneous Photocatalysis is the only book that provides the necessary fundamentals and explains how applications work at the molecular level.
	www.amazon.com /Homogeneous-Photocatalysis-Wiley-Photoscience-Photoengineering/dp/047196753X (665 words)

	Table of contents for Library of Congress control number 88033979
		Thermodynamic and Kinetic Aspects in Photocatalysis (M. Schiavello & A. Sclafani).
		Photocatalysis in Organized Assemblies (D. Meisel & M. Matheson).
		Heterogeneous Photocatalysis in the Environment: Application to Water Purification (D. Ollis & N. Serpone).
	www.loc.gov /catdir/toc/onix03/88033979.html (170 words)

	History
		Photocatalysis using semiconductors under irradiation has been extensively studied for about three decades.
		The main focus of previous studies have been to investigate the principal applicability of photocatalysis systems for efficient treatment of water polluted with toxic substances.
		Quantum size effects on photoreactions for semiconductor nanoparticles have only been recently studied.
	dev.nsta.org /evwebs/1952/history.htm (76 words)

	Green Quest - Photocatalyst Mechanism
		Chlorophyll of plants is a type of photocatalyst.
		Photocatalysis compared to photosynthesis, in which chlorophyll captures sunlight to turn water and carbon dioxide into oxygen and glucose, photocatalysis creates strong oxidation agent to breakdown any organic matter to carbon dioxide and water in the presence of photocatalyst, light and water.
		dioxide into oxygen and glucose, photocatalysis creates strong oxidation agent to
	www.tekon.com /green/Photocatalyst.html (945 words)

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