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Wyszukujesz frazę "kwas 2,4-dichlorofenoksyoctowy" wg kryterium: Temat

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    Tytuł:
    Technological aspects of the synthesis of 2,4-dichlorophenol
    Autorzy:
    Białek, A.
    Moszczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779182.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    2,4-dichlorofenol
    chlorowanie
    katalizator
    dioksyny
    kwas 2,4-dichlorofenoksyoctowy
    2,4-dichlorophenol
    chlorination
    catalyst
    dioxine
    2,4-dichlorophenoxyacetic acid
    Opis:
    The main factors influencing the selectivity of chlorophenols synthesis were described. The loss of raw materials and the composition of wastes obtained in a conventional technology of 2,4-D production based on 2,4-dichlorophenol (2,4-DCP) of the 89% purity were presented. The influence of some homogenous catalysts on the selectivity of 2,4-dichlorophenol obtained in phenol and chlorine reaction was examined. Using the combined catalyst enables to chlorinate selectively the monochlorophenols to 2,4-DCP without an undesirable increasing of the 2,6-dichlorophenol and 2,4,6-trichlorophenol contents. The catalyst transformations during the reaction of phenol chlorination were investigated and the method of its elimination after the reaction was elaborated.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 2; 21-30
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fotokatalityczna degradacja herbicydów : nowe katalizatory na bazie TiO2
    Photocatalytic degradation of herbicydes : new catalysts based on TiO2
    Autorzy:
    Ożóg, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/172094.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    tlenek tytanu
    TiO2
    degradacja fotokatalityczna
    kwas 2,4-dichlorofenoksyoctowy
    2,4-D
    kwas 2,4,5-trichlorofenoksyoctowy
    2,4,5-T
    4G-PHOTOCAT
    titanium dioxide
    photocatalytic degradation
    2,4-dichlorophenoxyacetic
    2,4,5-trichlorophenoxyacetic
    Opis:
    Over the past few decades a rapid increase in standard of living is observed. Rapid urbanization and development of new technologies, which are focused on the needs of a modern society, influence negatively the environment. The present policy of sustainable development is focused on the principles of rational use of scarce resources and raw materials. New technologies should comply with a number of requirements: efficiency, low costs and a low impact on the environment. Photocatalytic processes are the answer for these requirements. Photocatalysis can be used in many aspects of everyday life, offering self-cleaning surfaces, photo-drugs (e.g. for photodynamic therapy) and even photovoltaic devices. Photocatalytic degradation of pollutants in the presence of inorganic photocatalysts (e.g. TiO2 or ZnO) is one of the available methods of removing impurities from aqueous and gaseous phases. The main advantage of this process is the lack of wastes and formation of carbon dioxide, water and simple inorganic ions as end- -products. The aim of our work was to develop new TiO2-based photocatalysts doped with tungsten and molybdenum oxides. A series of materials with different content of the dopants, calcined at various temperatures, was prepared. The photocatalytic activity of the materials was determined following the degradation of two model herbicides: 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T). These compounds are used for the control of weed growth on crop plantations, but in a high dosage they can lead to destruction of the plants. They are readily soluble in water, therefore their use is simple, but brings a great risk to aquatic organisms and people. Photocatalytic degradation of herbicides is the main goal of the 4G-PHOTOCAT project. The efforts are directed towards development of a low-cost photocatalytic paint, that could be used in reactors for groundwater purification. The active ingredient of the paint is a composite material based on TiO2 modified with other metal oxides.
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 7-8; 606-616
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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