The Photocatalytic Degradation of Chlorophenol PDF Download
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Author: Michael Kenneth Levy
Publisher:
ISBN:
Category : Chlorophenols
Languages : en
Pages : 160
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Book Description
Author: Michael Kenneth Levy
Publisher:
ISBN:
Category : Chlorophenols
Languages : en
Pages : 160
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Book Description
Author: Radwa Elsalamony
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659549106
Category :
Languages : en
Pages : 264
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Book Description
There we will focus on the water pollution which is an important problem. This work aims to study the photocatalytic degradation of chlorophenols. They belong to a notable group of pollutants because of their high toxicity, and hardly biodegradable, and are difficult to remove from the environment. Photocatalytic degradation of chlorophenols using UV light was investigated over mesoporous catalysts. Ti-MCM-41(20), Ti-MCM-41(10), TiO2/MCM-41, Fe-Ti-MCM-41, TiO2/Fe-MCM-41 and TiO2/SBA-15 catalysts were prepared from the corresponding metal salts by the sol-gel technique. The catalyst were investigated using X-ray diffraction (XRD), FT-IR spectroscopes, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and BET surface areas of the samples were determined using the nitrogen adsorption and desorption isotherms. 100 ppm was used as model pollutants. High purity 2,4,6-trichlorophenol and 4-chlorophenol solutions individually and 0.1 g/L of each catalyst was tested at different irradiation times. At each interval time 10 ml of irradiated solution was taken and analyzed by High Performance Liquid Chromatography (HPLC), Ion Chromatography (IC). Aromatic interme
Author: Inamuddin
Publisher: Springer Nature
ISBN: 303054723X
Category : Science
Languages : en
Pages : 443
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Book Description
In the context of climate change and fossil fuel pollution, solar energy appears as a cheap and sustainable fuel for many environmental applications, yet the efficiency of techniques has to be improved. This book reviews recent methods and applications of photocatalysis for the treatment of wastewater containing bacteria, heavy metals, organic pollutants, dyes and tannery effluents. Basics of water pollution, polluted river ecosystems and membranes are also detailed.
Author: Chih-Chang Wang
Publisher:
ISBN:
Category : Chlorophenols
Languages : en
Pages : 230
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Book Description
Author: Shinoka Fujita
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 388
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Book Description
Author: Saengkae Pairattanakorn
Publisher:
ISBN: 9789749937747
Category :
Languages : en
Pages : 134
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Book Description
Author: Nyiak Tao Tang
Publisher:
ISBN:
Category : Degradation (Chemistry)
Languages : en
Pages : 109
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Book Description
Author: John R. Bedford
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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Book Description
Author: George R. Helz
Publisher: CRC Press
ISBN: 135108674X
Category : Science
Languages : en
Pages : 665
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Book Description
Aquatic and Surface Photochemistry provides a broad overview of current research in the emerging field of environmental aquatic and surface photochemistry. Selected reviews and current research articles are blended to provide an in-depth treatment of various aspects of this research area. The first part of the text deals with photochemistry in the environment, covering recent research on the following topics: aquatic photochemistry of organic pollutants and agrochemicals, photochemical cycling of carbon and transition metals (especially iron), photochemical formation of reactive oxygen species in natural waters, photoreaction in cloud and rain droplets, and photoreactions on environmental surfaces (soil, ash, metal, oxide). The second part provides discussions and data on both heterogeneous photocatalytic and homogeneous processes, with topics ranging from applications to mechanistic studies. These chapters illustrate the wide diversity of pollutant classes that are degradable by photochemical techniques and the effects of various reaction conditions on the rates and efficiency of the techniques. Current kinetic studies are presented, which provide new information about the role of adsorption and the nature of the reactive oxidizing species that mediate these photoremediation processes.This book will interest civil, chemical, and environmental engineers, as well as chemists, soil scientists, geochemists, and atmospheric chemists.
Author: Laurence Timothy Hogg
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Book Description
The photo-activity and specific surface area of a number of potentially-useful photocatalysts has been determined using the liquid phase dehydrogenation of propan-2-ol (activity), and the adsorption of argon gas at 77K (surface area). Degussa P25 titanium dioxide was considered the most active solid on this basis (activity=l23_+5xl0-4mol.g-1h-1, SA 39_+3 m2g-1). The photo-activity of suspended solids was found to be dependent upon the anatase:rutile ratio and the catalyst concentration, but relatively independent of the surface area for structurally different specimens. This has been explained in terms of the absorbance of band-gap radiation by the solid as a function of suspended particulate mass. Experimental evidence regarding the rate of propan-2-ol photo-oxidation under oxygen-purged conditions compared to the observed rate under air, suggests a rate dependence upon the partial pressure of oxygen of P02 1/2 The total photocatalytic mineralisation of aqueous 2-chlorophenol mediated by Degussa P25 TiO2 has been achieved in approximately 5 hours (c0 2CP = 5x10-4M), with an initial zero order rate constant of 1.7x10-4mol.g-1h-1. (6h irradiation period). The kinetics of the reaction are shown to be loosely expressed by the Langmuir-Hinshelwood kinetic model, but complex kinetics were in evidence under conditions of partial mineralisation, which may be dictated by the solution pH and/or the concentration of intermediate degradation products. A mechanism for the photo-oxidation reaction has also been proposed, based upon experimental evidence involving measurements of pH, conductance, carbon dioxide evolution and GCMS studies, which suggests a complex reaction pathway. The photocatalytic mineralisation of a saturated solution of gamma - hexachlorocyclohexane (Lindane, 7ppm), has been achieved in approximately 2 hours by this method and the mechanistic and kinetic details of this reaction are discussed briefly.
