Download or read book Photocatalytic Gas Detoxification of Air Polluted with Volatile Organic Compounds written by Ricardo Rivera Sotomayor and published by . This book was released on 1996 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solar Photocatalytic Gas Detoxification Pilot Plant Study written by Janice Aimee López Cabrera and published by . This book was released on 1996 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas Stripping of Organic Pollutants Using a Shallow tray Air Stripper and Detoxification by UV catalyzed Photolysis written by Vicky LaShea Harrison and published by . This book was released on 1997 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determines the feasibility of using a traytype air stripping technology to successfully remove volatile organic compounds such as benzene, toluene, and a range of hydrocarbons from groundwater. Discusses a system to destroy the contaminants by ultraviolet flashlamps once they are transferred into the air.

Download or read book Gas phase Photocatalytic Oxidation of Organic Air Pollutants written by Svetlana Jõks and published by . This book was released on 2012 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Volatile Organic Compounds By products Generation in Photocatalytic Oxidation Reactor written by Mojtaba Malayeri and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of volatile organic compounds (VOCs) in indoor air is inevitable. Their adverse effect on human health has encouraged researchers to develop various technologies for air pollution remediation. Photocatalytic oxidation (PCO) has been regarded as a promising and emerging technique for air purification and extensively investigated in the last two decades to characterize and improve the effectiveness and performance of this technology. In addition, the development of appropriate models can enhance the understanding of reactor performance and the evaluation of intrinsic kinetic parameters that enable the scale-up or re-design of more efficient large-scale photocatalytic reactors. This research works on mathematical modeling of gas phase photocatalytic reactors and analyses different key factors that can enhance pollutants decomposition. At the first step, a one-dimensional time-dependent mathematical model for continuous flow UV-PCO reactor has been developed. In this model, transfer of pollutants by advection and dispersion in bulk phase incorporates with the reaction rate based on the extended Langmuir Hinshelwood model in the catalyst phase. CFD modeling was also used to determine the flow distribution in the reactor at various airflow rates. Moreover, the light intensity distribution on the photocatalyst surface was simulated using the linear source spherical emission model. A dimensionless form of the model was then proposed to generalize the result for any scale. The proposed model was validated first by comparing with predictions of other models (inter-model comparison) and then by experimental data from two different scales (pilot and bench) of UV-PCO reactors. Furthermore, a sensitivity analysis using dimensionless parameters was conducted to find the controlling step in the PCO process. To validate the model, acetone, MEK, and toluene were tested in the UV-PCO reactor with a commercial PCO filter (TiO2 coated on silica fiber felts) at various operating conditions, such as concentration, relative humidity, irradiance and air velocity. The main issue for applying PCO technology in the indoor environment is the generation of hazardous by-products. The effect of by-products formation was usually ignored in former modeling studies. The next effort was to improve the model and build a comprehensive one to consider by-products generation in the UV-PCO reactor. To achieve this goal, a possible reaction pathway for degradation of each challenge compound was proposed based on identified by-products in analytical methods (GC-MS and HPLC). Different possible reaction rate scenarios were evaluated to find the best expression fitted to experimental data at the steady-state condition. The obtained reaction coefficients were then used to validate the model under various operating conditions. Finally, the Health Risk Index was used to investigate the implications of generated by-products on human health under varying operating conditions. The results indicated that the proposed model has a great potential to simulate the behavior of UV-PCO reactor in a real application.

Download or read book Photo catalytic Control Technologies of Flue Gas Pollutants written by Jiang Wu and published by Springer. This book was released on 2018-09-20 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the theory and applications of nanometer photocatalysis, and it briefly presents the concept of photocatalysts, photocatalytic reaction mechanisms and kinetics, and photocatalytic reactor design. In addition, the use of photocatalysis in the control of flue-gas pollutants is discussed in detail. The book also describes how a photocatalytic reactor is designed and implemented to evaluate the photocatalytic oxidation capacity of different photocatalysts on elemental mercury in a simulated flue gas. After that, the effect of photocatalysts on the SO2, NOx and Hg removal in the flue gas is studied. Photocatalytic cleaning technology can be applied not only in gas pollutant cleaning at power plants, but also in wastewater purification. Readers gain a comprehensive understanding of possible mercury emission control methods and the industrial applications of these technologies.

Download or read book Development of Photocatalytic Oxidation Technology for Purification of Air and Water written by Chun-Wai Ringo Lam and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Development of Photocatalytic Oxidation Technology for Purification of Air and Water" by Chun-wai, Ringo, Lam, 林俊偉, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Development of photocatalytic oxidation technology for purification of air and water" Submitted by Lam Chun Wai, Ringo for the degree of Master of Philosophy at the University of Hong Kong in January 2007 The adverse health effect of indoor air pollutants has aroused the attention of scientists and medical personnel since the outbreak of Legionnaires' disease in Philadelphia in 1976. Since then, numerous investigations of indoor air quality have demonstrated the positive correlation between the health risks and exposure to air pollutants such as oxides of nitrogen (NO ), sulphur dioxide (SO ), carbon monoxide x 2 (CO) and volatile organic compounds (VOC). Employees exposed to such pollutants complain of problems such as headaches and irritated eyes. These symptoms are related to elevated indoor air pollutant concentrations, which produce the condition known as sick building syndrome (SBS). There are various types of air purification systems available on the market to reduce the concentration of indoor air pollutants, such as particulate matters, VOC and micro-organisms. High-efficiency particulate air (HEPA) filters, ultraviolet germicidal irradiation (UVGI) lamps and ozone generators are commonly used. However, none of these systems offers a complete solution and some of them may even cause health hazards themselves. The photocatalytic oxidation technology employs a more robust air purification mechanism. When UVA light is incident on photocatalysts, hydroxyl and hydroperoxyl radicals will be generated. These strong oxidizing radicals can decompose VOCs into harmless simple compounds, eliminate odors and destroy microbial bioaerosols. Since the radicals generated stay on the surface of the photocatalyst and no reactive chemical is released into the air stream, the photocatalytic air purification device causes no harm to the building's occupants. This study aims to investigate the use of photocatalysis for indoor air purification. The TiO thin film was characterized with different characterization methods such as 2 Differential Scanning Calorimetry and Thermal Gravity (DSC/TG) analysis, X-ray diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM), UV- Vis NIR absorption spectra, Scanning Electron microscope (SEM) and X-ray Photoelectron Spectroscopy (XPS). Common indoor air pollutants such as formaldehyde (HCHO), nitrogen monoxide (NO), nitrogen dioxide (NO ) and airborne bacteria were selected as target compounds. Parametric analyses were conducted with the aforementioned pollutants under different parameters in the presence of TiO . The photodegradation rate, in general, increased with decreasing initial pollutant concentration and increasing UVA light intensity. Airborne bacteria, staphylococcus aureus and mycobacterium tuberculosis (MTB), were successfully photo-degraded by UVA light with the presence of sol-gel TiO . Another objective of this study was to extend the useful spectral range of photocatalyst from UVA light to visible light. It could be done by implantation of chromium (Cr) ion into TiO photocatalyst. The experimental results revealed the effectiveness of the visible-light-assisted Cr/TiO photoreactors in degradation of gaseous formaldehyde. It implied that the photoreactors could be effectively applied to achieve solar photocatalysis.

Download or read book Heterogeneous Photocatalysis written by M. Schiavello and published by . This book was released on 1997-10-09 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis is a reaction which is accelerated by light while a heterogeneous reaction consists of two phases ( a solid and a liquid for example). Heterogeneous Photocatalysis is a fast developing science which to date has not been fully detailed in a monograph. This title discusses the basic principles of heterogeneous photocatalysis and describes the bulk and surface properties of semiconductors. Applications of various types of photoreactions are described and the problems related to the modeling and design of photoreactors are covered.

Download or read book Photocatalytic Oxidation of Volatile Organic Compounds in the Air written by Daniel Grooms and published by . This book was released on 2002 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nanophotocatalysis and Environmental Applications written by Inamuddin and published by Springer. This book was released on 2019-06-07 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will be a guiding path to understand the photocatalytic process and mechanism for the deterioration of heavy metals, persistent organic pollutants and pathogens from wastewater. Environmental remediation is of crucial importance in the context of human sustainability in the present and future times. The unplanned anthropogenic activities and revolutionary industrialization end up in environmental contamination with noxious organic-inorganic and biogenic pollutants. The photocatalytic disinfection and detoxification is the only solution to preserve and restore the ecological balance. The main emphasis is to explore and enhance the photocatalytic potentials of solar active-materials.

Download or read book Solar Detoxification written by Julián Blanco Gálvez and published by UNESCO. This book was released on 2003 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar detoxification, an innovative process of water treatment using solar technology, is ready for practical application after a decade of research and development. This is of great significance as 70 per cent of the world's population currently lives within the 'sun belt', where sustainable solar technologies are feasible--a proportion due to increase in the future. Divided into two parts, the first part addresses the theory and fundamentals of water decontamination using solar energy. This prepares .the reader for the second part of the book, which addresses practical applications and engineering processes. Although the book targets university students and post graduates it can also be read by any professional or technician as all subjects are treated in depth, with scientific rigor, but are also attractively presented with a profusion of pictures and graphics. No specific previous knowledge is necessary.

Download or read book Photocatalytic Destruction of Volatile Organic Compounds from the Oil and Gas Industry written by Oluwatosin Tokode and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas phase Photocatalytic Oxidation written by Craig Steven Turchi and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photocatalytic Reaction Engineering written by Hugo de Lasa and published by Springer Science & Business Media. This book was released on 2006-10-31 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterogeneous photocatalysis is a novel technique for water purification. Publications on photocatalysis span a relatively recent period of not more than 25 years. 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.

Download or read book New and Future Developments in Catalysis written by Steven L Suib and published by Newnes. This book was released on 2013-07-19 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: New and Future Developments in Catalysis is a package of seven books that compile the latest ideas concerning alternate and renewable energy sources and the role that catalysis plays in converting new renewable feedstock into biofuels and biochemicals. Both homogeneous and heterogeneous catalysts and catalytic processes will be discussed in a unified and comprehensive approach. There will be extensive cross-referencing within all volumes.The use of solar energy during various catalytic chemical processes for the production of an array of chemical products is the theme of this volume. Photocatalysis is a topic of increasing importance due to its essential role in many of today's environmental and energy source problems. The use of solar energy for catalytic reactions results in a carbon dioxide–neutral process. All photocatalytic processes and the future developments in this area are discussed, including an economic analysis of the various processes. - Offers in-depth coverage of all catalytic topics of current interest and outlines future challenges and research areas - A clear and visual description of all parameters and conditions, enabling the reader to draw conclusions for a particular case - Outlines the catalytic processes applicable to energy generation and design of green processes

Download or read book Photocatalytic Oxidation of Volatile Organic Compounds for Indoor Air Applications written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalytic oxidation (PCO) is a promising and emerging technique in controlling indoor air contaminants, including volatile organic compounds (VOCs). It has broad air cleaning and deodorization applications in indoor environments ranging from residential and office buildings to healthcare and nursing facilities as well as spacecrafts, aircraft cabins and clean rooms in the agricultural and food industry. Numerous studies have been conducted to improve the effectiveness and performance of this technology. These include development of new configurations, energy-efficient catalysts and other parameters to control the process. However, only limited research has been conducted under realistic indoor environmental conditions. One of the most recent developments in photocatalysis is the synthesis of 2% C- and V-doped TiO[subscript]2, which is active under both dark and visible light conditions. However, like most research conducted in photocatalysis, the study on the reactivity of this catalyst has been performed only under laboratory conditions. This study investigated the possible application of the novel C and V co-doped TiO[subscript]2 in cleaning indoor air. Mathematical modeling and simulation techniques were employed to assess the potential use of some of the promising systems that utilize the catalyst (i.e., packed bed and thin films) as well as the effect of mass transfer limitations in the degradation of acetaldehyde, one of the VOCs that can be found in offices, residential buildings and other facilities.

Download or read book Air Pollution by Photochemical Oxidants written by Robert Guderian and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photochemical oxidants are secondary air pollutants formed under the influence of sunlight by complex photochemical reactions in air which contains nitrogen oxides and reactive hydrocarbons as precursors. The most adverse components formed by photochemical reactions in polluted air are ozone (0 ) 3 and peroxyacetyl nitrate (PAN), among many other products such as aldehydes, ketones, organic and inorganic acids, nitrates, sulfates etc. An analysis and evaluation of the available knowledge has been used to characterize the relationships among emissions, ambient air concentrations, and effects, and to identify the important controlling influences on the formation and effects of photochemical oxidants. The biological activity of photochemical oxidants was first clearly manifested during the early 1940's, when vegetation injury was observed in the Los Angeles Basin in the United States. Since that time, as a consequence of the increasing emissions of photochemical oxidant precursors, the photochemical oxidants have become the most important air pollutants in North America. In other parts of the world, for example South and Central America, Asia, and Australia, photo chemical oxidants threaten vegetation, particularly the economic and ecological performance of plant life. According to my knowledge, the first observations of ozone and PAN injury to vegetation in Europe were made by Dr. Ellis F. Darley (Statewide Air Pollution Research Center, University of California, Riverside, California) during a study visit (1963/64) to the Federal Republic of Germany.