Photocatalytic Degradation of Paraquat Dichloride Using Coupled Zinc Oxide/titanium Dioxide Thin Films PDF Download
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Author: Kar Wai Pon
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Author: Kar Wai Pon
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Author: Yoon Thai Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Titanium dioxide (TiO2), a semiconductor metal oxide, has been used in heterogeneous photocatalysis for the destruction of organic, inorganic, and biological materials. The chief objectives of my doctoral research are to generate kinetic data and to develop engineering models for photocatalytic oxidation (PCO) using TiO2 thin films for current challenges in "solid"--Solid and air-solid environmental remediation. Three topics are studied in detail: i. TiO2 Photocatalytic Oxidation for Formaldehyde Removal from Air (Air-Solid) Formaldehyde (CH2O) is a toxic air contaminant present in industrial, commercial, and residential buildings. A novel rotating honeycomb adsorbent coupled with a PCO reactor was demonstrated by F. Shiraishi and coworkers for CH2O oxidation. They showed that their cyclic adsorbent D PCO reactor could oxidize CH2O to concentrations below the WHO guideline, but they made no attempt to model the system. In this project we modeled their batch system at transient and steady states. In addition, we applied the batch model kinetic parameters to design a continuous system for typical residential home challenges. ii. TiO2 Photobleaching of Dye Layers as a Field Analysis Method ("Solid"-Solid) Technological advances in the past decade allow glass manufacturers to deposit thin, photoactive, nano-sized TiO2 layers on glass billed as "self-cleaning" surfaces. Field installation of such "self-cleaning" window glass for office buildings or residential homes will require the creation of field analysis methods to characterize the initial and continuing catalyst activity variations with time and environmental conditions. In this project we characterized the PCO properties of commercial Pilkington Activ"!glass by oxidizing deposited organic dyes (a) to show visual decolorization and recovery of the aesthetic clarity of the glass and (b) to determine the light-driven reaction kinetics on Activ"!glass. i.
Author: Irwanshah Amanshah
Publisher:
ISBN:
Category : Photocatalysis
Languages : en
Pages : 51
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Author: Nadzirah Ahmad Thawari
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Author: Noraidura Amin
Publisher:
ISBN:
Category : Photocatalysis
Languages : en
Pages : 105
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Author: Rodrigo Teixeira Bento
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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The aim of this work was to characterize and evaluate the influence of the thickness on the photocatalytic efficiency of titanium dioxide thin films on the degradation of methyl orange dye under UV light irradiation. The films of 280 and 468 nm thick were deposited on borosilicate substrates at 400°C by the MOCVD technique using titanium isoproxide IV as precursor. XRD analyses showed the formation of anatase-TiO2 phase. Cross-sectional FE-SEM images show that the films presented a dense columnar structure and grown perpendicularly to the substrate surface. The photocatalytic activity of the catalysts was studied using UV-vis spectrophotometry The TiO2 film with 468 nm of thickness presented higher photocatalytic activity exhibiting 69% of dye degradation. The increase of grain size and thickness of the films promoted an improvement of photocatalytic efficiency.
Author: Halimahton Saadiah Hasli
Publisher:
ISBN:
Category : Photochemistry
Languages : en
Pages : 49
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Author: Ruoh Chyang Tang
Publisher:
ISBN:
Category :
Languages : en
Pages : 62
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Author: Umar Ibrahim Gaya
Publisher: Springer Science & Business Media
ISBN: 9400777752
Category : Science
Languages : en
Pages : 222
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Book Description
This book underscores the essential principles of photocatalysis and provides an update on its scientific foundations, research advances, and current opinions, and interpretations. It consists of an introduction to the concepts that form the backbone of photocatalysis, from the principles of solid-state chemistry and physics to the role of reactive oxidizing species. Having recognised the organic link with chemical kinetics, part of the book describes kinetic concepts as they apply to photocatalysis. The dependence of rate on the reaction conditions and parameters is detailed, the retrospective and prospective aspects of the mechanism of photocatalysis are highlighted, and the adsorption models, photocatalytic rate expressions, and kinetic disguises are examined. This book also discusses the structure, property, and activity relationship of prototypical semiconductor photocatalysts and reviews how to extend their spectral absorption to the visible region to enable the effective use of visible solar spectrum. Lastly, it presents strategies for deriving substantially improved photoactivity from semiconductor materials to support the latest applications and potential trends.
