"In chemistry, photocatalysis refers to the acceleration of a photoreaction in the presence of a catalyst. Various aspects and applications of this process are described in the six chapters of this book. Chapter One addresses the reduction and oxidation of heavy metals by the photocatalytic process to produce less toxic forms, thus reducing pollution. Chapter Two reviews some issues of photocatalytic reactions which may have been overlooked in other reports. Chapter Three deals with the utilization of ZnO-CdO nanoblocks as adsorbent and efficient solar photocatalysts towards brilliant cresol blue degradation. Chapter Four explains heterogeneous photocatalysis through the use of titanium and tungsten oxide nanostructures. Chapter Five reports the fabrication and evaluation of TiO2 nanowires supported on graphene and sensitized with Ag in a unique hierarchical three-dimensional sandwich structure. Lastly, Chapter Six provides an overview of recent achievements in C-N bond formation reactions triggered by visible light-induced DDQ-photoredox catalysis"--
Author(s): Orva Auger
Series: Chemistry Research and Applications
Publisher: Nova Science Publishers
Year: 2022
Language: English
Pages: 200
City: New York
Contents
Preface
Chapter 1
Oxidation and Reduction of Heavy Metals by Photocatalytic Process
Abstract
Introduction
Photocatalytic Process for Oxidation and Reduction of Heavy Metals
Photocatalytic Reduction Processes
Lead Reduction
Photoreduction of Lead and the Use of Organic Electron Donors
The pH Effect
Lead Photoreduction Mechanism
Different Photocatalysts Applied to Lead Photoreduction and Photocatalyst Reuse
Selenium Reduction
Photoreduction of Selenite and Selenate: The Role of Organic Electron Donors
The pH Effect
Selenium Photoreduction Mechanism
Application and Reuse of Photocalalysts on Selenium Photoreduction
Photocatalytic Oxidation Processes
Arsenium Oxidation
References
Biographical Sketches
Chapter 2
Peculiarities of the Reactions on Particulate Photocatalysts
Abstract
Introduction
Various Charge-Transfer Reactions at Solid-Solution Interfaces
Reaction Rates and Reorganization Energy
Essential Difference between Photocatalysis and Electrochemistry
Electric Potential Near the Solid Surface
Lead-Wire-Free Particulate Photoelectrode
Effects of Light Intensity and Reactant Concentration on Photocatalytic Oxidation Rates
Conclusion
References
Chapter 3
ZnO-CdO Nanoblocks: Utilization as Adsorbent and Efficient Solar Photo-Catalyst towards Brilliant Cresol Blue Degradation
Abstract
Introduction
Experimental Sections
Materials and Methods
Synthesis and Growth Mechanism of Doped ZnO-CdO NBs
Photocatalytic Degradation of BCB with Doped ZnO-CdO NBs
Samples Preparation and Procedure for Metal Ions Uptakes Using ZnO-CdO NBs
Results and Discussion
Characterization of Doped ZnO-CdO NBs
Photocatalytic Degradation of BCB Using ZnO-CdO NBs
Metal Ions Uptakes Using Doped ZnO-CdO NBs (Batch Method)
Selectivity Study of Calcined ZnO-CdO NBs
Static Adsorption Capacity
Adsorption Isotherm Models
Conclusion
References
Chapter 4
Heterogeneous Photocatalysis Explained through the Use of Titanium and Tungsten Oxide Nanostructures
Abstract
Introduction
Literature Review
Photocatalysis
Titanium Dioxide (TiO2)
Tungsten Trioxide (WO3)
Sodium Tungstate Dihydrate (Na2WO4.2H2O)
Substrates
Electrospinning
Spin-Coating
Materials and Methods
Sample Construction
Electrospinning
Obtaining the Films by Spin-Coating
Characterization of Nanostructures
Photocatalytic Measurements
Results and Discussion
Descriptive of the Phases Present in the Samples
Microstructure in the Samples
Applications
Conclusion
References
Chapter 5
Designing an Enhanced Visible-Light Activated Hierarchical Three-Dimensional Ag/TiO2 Nanowires/Graphene Sandwich Photocatalyst
Abstract
Introduction
Experimental Methods
Materials
Synthesis
Graphene Oxide (GO) Synthesis
Ag/TNW/RGO Synthesis
Characterization
Photocatalytic Degradation
Results
Characterization Studies
Microscopic and Surface Area Analysis
XRD Analysis
Raman Analysis
Diffuse Reflectance UV-Vis Spectroscopy (DRS)
Photocatalytic Degradation Studies
Discussion
Conclusion
Acknowledgements
References
Chapter 6
Visible Light‐Mediated DDQ Photoredox‐Catalyzed C-N Bond Formation Reactions: A Review
Abstract
Introduction
DDQ-Initiated C-N Bond Formation under Visible-Light Irradiation
Conclusion and Outlook
References
Index
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