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Category :
Languages : en
Pages : 36
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Book Description
The optimization of a technology for the TiO2-mediated solar photocatalysis of atrazine is described. The target users of this technology might be agrochemical dealers, manufacturers, and possibly farmers. Studies were performed to determine the ideal cover material for such a reactor based on UV light transmitting properties. The best cover material was a UV transmitting acrylic. The TiO2 employed for this technology was bound to fiberglass mesh. The effects of mesh amount, stirring, water impurities, concentration of pesticide, and source of UV light (mercury vapor lamp vs. solar) were also determined. The most efficient photocatalysis was achieved using five layers of mesh, a stirred reaction, water low in carbonate and other ions, a dilute waste stream, and solar irradiation rather than a mercury-vapor lamp. The formation and disappearance of eight intermediates were followed in a 2429 h indoor experiment comparing pure and formulated atrazine. A modified reaction mechanism was proposed based on studies of the detected intermediates.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
The optimization of a technology for the TiO2-mediated solar photocatalysis of atrazine is described. The target users of this technology might be agrochemical dealers, manufacturers, and possibly farmers. Studies were performed to determine the ideal cover material for such a reactor based on UV light transmitting properties. The best cover material was a UV transmitting acrylic. The TiO2 employed for this technology was bound to fiberglass mesh. The effects of mesh amount, stirring, water impurities, concentration of pesticide, and source of UV light (mercury vapor lamp vs. solar) were also determined. The most efficient photocatalysis was achieved using five layers of mesh, a stirred reaction, water low in carbonate and other ions, a dilute waste stream, and solar irradiation rather than a mercury-vapor lamp. The formation and disappearance of eight intermediates were followed in a 2429 h indoor experiment comparing pure and formulated atrazine. A modified reaction mechanism was proposed based on studies of the detected intermediates.
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ISBN:
Category :
Languages : en
Pages : 26
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Book Description
TiO2 photocatalysis is investigated is a potential means for the disposal of pesticide rinsate waste at agrochemical dealerships. The focus is an evaluation of parameters that affect the rate and mechanism of atrazine degradation using formulated atrazine (ca. 20-25 ppm), TiO2 mesh, a high-pressure mercury-vapor lamp, and solar irradiation. The UV transmission of a variety of transparent materials was measured and atrazine photocatalysis was carried out using several materials as reactor covers. The pseudo-first-order rate constants were calculated and compared to determine which cover results in the most efficient atrazine degradation. A clear acrylic gave results nearly identical to Pyrex and was chosen for future photocatalytic experiments. UV intensity and photocatalytic rate were studied as a function of different numbers of layers of TiO2 mesh. It was found that five layers give the optimum rate of degradation without employing excess mesh. In order to assess the general effect of impurities present in water on the rate of atrazine degradation, water from five different sources was obtained and each sample was analyzed for purity and used to prepare aqueous atrazine for photocatalytic degradation. The results show that contaminants specific to different locations are likely to inhibit the rate of photocatalysis to different degrees. While working to maximize the rate of atrazine degradation, studies are concurrently in progress to elucidate the mechanism of degradation for the experimental conditions employed herein. Initial results indicate that the overall degradation of atrazine to the reported end product, cyanuric acid, occurs by two distinct pathways of similar importance.
Author:
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Category :
Languages : en
Pages :
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Author: Janis Mc Farland Ph.D.
Publisher: Elsevier
ISBN: 0080559638
Category : Technology & Engineering
Languages : en
Pages : 604
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Book Description
Over the past 50 years, triazines have made a great impact on agriculture and world hunger by assisting in the development of new farming methods, providing greater farming and land use capabilities, and increasing crop yields. Triazines are registered in over 80 countries and save billions of dollars a year. The Triazine Herbicides is the one book that presents a comprehensive view of the total science and agriculture of these chemicals. With emphasis on how the chemicals are studied and developed, reviewed, and used at the agricultural level this book provides valuable insight into the benefits of triazine herbicides for sustainable agriculture. - Presents previously unpublished information on the discovery, development and marketing of herbicides - Includes a vital section on the origin, use, economics and fate of triazine herbicides - Covers benefits of triazines in corn and sorghum, sugarcane, citrus, fruit and nut crops - Establishes best management practice and environmental benefits of use in conservation tillage
Author: Daniel William Tedder
Publisher:
ISBN: 9780841233225
Category : Language Arts & Disciplines
Languages : en
Pages : 344
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Book Description
This volume summarizes remedial technologies for contaminated soils and ground waters, discusses treatment combinations for remediation of Superfund sites, and focuses on new developments in soil cleaning, resource recovery, nitrification, thermal destruct
Author: Kayzad Jimmy Vajifdar
Publisher:
ISBN:
Category : Atrazine
Languages : en
Pages : 186
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Book Description
Author: American Society of Mechanical Engineers. Solar Energy Division. Conference
Publisher:
ISBN:
Category : Solar energy
Languages : en
Pages : 684
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 708
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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ISBN:
Category :
Languages : en
Pages : 29
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The Tennessee Valley Authority's Environmental Research Center has been developing a means of detoxifying atrazine waste waters using TiO2 photocatalysis. The toxicity and physical properties of atrazine and its degradation products will probably be required information in obtaining permits from the United States Environmental Protection Agency for the demonstration of any photocatalytic treatment of atrazine waste waters. The following report is a literature survey of the toxicological and physical properties of atrazine and its degradation products.
Author: Manuel A. Heredia
Publisher:
ISBN:
Category : Photocatalysis
Languages : en
Pages : 180
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Book Description
