Download Free Design And Development Of Nanostructured Photocatalysts For Co2 Reduction Under Ambient Conditions Book in PDF and EPUB Free Download. You can read online Design And Development Of Nanostructured Photocatalysts For Co2 Reduction Under Ambient Conditions and write the review.

The solar-light driven photocatalysis is considered a promising solution to both energy-shortage and environmental issues. In photocatalysis, a semiconductor-based photocatalyst is key to efficient CO2 reduction. Among others, graphitic carbon nitride and quantum dots materials are the most investigated because of their easy synthesis, low cost, and outstanding physicochemical properties. Numerous g-C3N4 and quantum dots - based nanostructured photocatalysts have been developed and studied for photocatalytic CO2 reduction. However, their photocatalytic performance is still moderate due to the rapid charge recombination and insufficient solar-light absorption. This thesis employed facile and new strategies to develop three efficient photocatalysts for CO2 reduction. The synthesized materials exhibit unique structural properties with improved solar-light absorption and increased charge separation rate, thus contributing to photocatalytic efficiency. For the g-C3N4 materials, we first employed cobalt cluster embedded graphitic carbon nitride as a cocatalyst for CO2 reduction by copolymerization between urea and cobalt complex as g-C3N4 and cobalt cluster precursors, respectively. Using 4,4'-Diamino-2,2'-bipyridine as a coordinating ligand of the cobalt complex is beneficial. First, it can copolymerize with urea during the thermolysis for the g-C3N4 formation, thus improving solar-light absorption of g-C3N4. Secondly, it can stabilize the cobalt cluster and provide and efficient electron transfer pathway between g-C3N4 and the cobalt cluster, resulting in enhanced photocatalytic performance. In the second material, we attempted to improve the solar-light absorption of g-C3N4 by incorporating TiN plasmonic nanoparticles onto the surface of g-C3N4 nanosheets. Before the incorporation, the surface of plasmonic TiN nanoparticles is grafted with amino groups to enhance the interaction with urea during the thermal copolymerization process. The synthesized material exhibited enhanced solar-light absorption and improved charge separation. As a result, this photocatalyst demonstrated high performance for photocatalytic CO2 reduction under solar-light irradiation. Regarding quantum dots material, we attempted to explore the relationship between the localized protons near the active sites and the photocatalytic performance by employing 3- mercaptopropionate as a proton shutter on CdS quantum dot surfaces. A facile aqueous synthesis was utilized to synthesize the water-soluble 3-mercaptopropionic acid (MPA)- capped CdS quantum dots. It was found that the enhanced photocatalytic activity of functional CdS quantum dots could be attributed to the cooperative interaction between localized protons and surface Cd atoms, which behave as a result of the Lewis acid and Lewis base interaction, respectively.
Nanostructured Photocatalysts: From Materials to Applications in Solar Fuels and Environmental Remediation addresses the different properties of nanomaterials-based heterogeneous photocatalysis. Heterogeneous nanostructured photocatalysis represents an interesting and viable technique to address issues of climate change and global energy supply. Sustainable hydrogen (H2) fuel production from water via semiconductor photocatalysis, driven by solar energy, is regarded as a viable and sustainable solution to address increasing energy and environmental issues. Similarly, photocatalytic reduction of CO2 with water for the production of hydrocarbons could also be a viable solution. Sections cover band gap tuning, high surface area, the short diffusion path of carriers, and more. Introduces the utilization of nanostructured materials in heterogeneous photocatalysis for hydrogen fuel production via water splitting Explains preparation techniques for different nanomaterials and hybrid nanocomposites, enabling improved sunlight absorption efficiency and enhanced charge separation Assesses the challenges that need to be addressed before this technology can be practically implemented, particularly of identifying cost-effective nanophotocatalysts
A comprehensive and timely overview of this important and hot topic, with special emphasis placed on environmental applications and the potential for solar light harvesting. Following introductory chapters on environmental photocatalysis, water splitting, and applications in synthetic chemistry, further chapters focus on the synthesis and design of photocatalysts, solar energy conversion, and such environmental aspects as the removal of water pollutants, photocatalytic conversion of CO2. Besides metal oxide-based photocatalysts, the authors cover other relevant material classes including carbon-based nanomaterials and novel hybrid materials. Chapters on mechanistic aspects, computational modeling of photocatalysis and Challenges and perspectives of solar reactor design for industrial applications complete this unique survey of the subject. With its in-depth discussions ranging from a comprehensive understanding to the engineering of materials and applied devices, this is an invaluable resource for a range of disciplines.
This book explains the basic and fundamental aspects of nanotechnology and the potential use of nanostructured photocatalysts in various applications, especially in the context of the environment and energy harvesting. It describes the preparation and characterization of unique nanostructured photocatalysts and provides details of their catalytic action, and also discusses the design of new types of photocatalysts with controlled nanostructures. Given its broad scope, the book will appeal to academic and industrial researchers interested in heterogeneous photocatalysis, sustainable chemistry, energy conversion and storage, nanotechnology, chemical engineering, environmental protection, optoelectronics, sensors and surface and interface science.
Nanostructured Photocatalysts: From Fundamental to Practical Applications offers a good opportunity for academic, industrial researchers and engineers to gain insights on the fundamental principles and updated knowledge on the engineering aspects and various practical applications of photocatalysis. This book comprehensively and systematically reviews photocatalytic fundamental aspects, ranging from reaction mechanism, kinetic modeling, nanocatalyst synthesis and design, essential material characterization using advanced techniques, and novel reactor design and scale-up. Future perspectives, techno-economical evaluation and lifecycle assessment of photocatalytic processes are also provided. Finally, a wide range of practical, important and emerging photocatalytic applications, namely wastewater treatment, air pollution remediation, renewable and green energy generation, and vital chemical production are thoroughly covered, making this book useful and beneficial for engineers, scientists, academic researchers, undergraduates and postgraduates. Provides a fundamental understanding of photocatalysis Covers all aspects of recent developments in photocatalytic processes and photocatalytic materials Focuses on advanced photocatalytic applications and future research advancements on energy, environment, biomedical, and other specialty fields Contains contributions from leading international experts in photocatalysis Presents a valuable reference for academic and industrial researchers, scientists and engineers
The ensuing thesis examines the conversion of carbon dioxide (CO2) to value-added chemical and fuels under solar light irradiation by employing some of the emerging photocatalytic materials known as covalent organic frameworks (COFs). This approach of photocatalytic process is considered to be one of the most viable remedies to global warming and energy crisis dilemmas. Importantly, this thesis delivers three novel nanostructured hybrid composites based on COFs for photocatalytic CO2 reduction to value-added chemicals and fuels. Light-harvesting, charge separation, and surface reactions are critical aspects that have an enormous impact on CO2 photoreduction. Covalent organic frameworks can be suitable candidates for these processes as they offer outstanding structural features and properties. Diverse nanostructured photocatalysts are actively being developed for CO2 photoreduction. Multidimensional nanostructures and nanocomposite heterostructures are widely studied because of their excellent attributes such as efficient separation and long lifetime of the excited charge carriers. Promisingly, nanostructures and nanocomposites of the covalent organic frameworks with graphene and its derivatives, metal dichalcogenides and plasmonic materials exhibit excellent photocatalytic performance, according to the literature reports. In this investigation, a keto-enamine TpPa-1 covalent organic framework and reduced graphene oxide nanosheet nanocomposite are developed by an in-situ assembling technique. The covalent interactions between TpPa-1 and rGO facilitated the formation of band edges with required potential and thereby to achieve an improved charge separation along with rapid migration of charge carriers to the surface toward the selective reduction of CO2. By the support of the electron mediator [Co(bpy)3]2+ in the hybrid served as the active sites for the coordination, activation, and reduction of CO2 molecules to CO. A hollow nano spherical TpPa-1 covalent organic framework (COF) integrated with single atom Co-1T-MoS2 (TpPa-1/Co-1T-MoS2) is further designed and developed through a dual-ligand strategy to tune the band edge potential and enhance the charge separation to improve CO2 photoreduction efficiency of the system. The interactions between TpPa-1 and Co-1T-MoS2 aided and enhanced the charge separation as well as charge carrier migration to the surface resulted in selective conversion CO2 to CO. Au plasmonic nanoparticles adorned three-dimensional hollow porphyrin-based covalent organic framework with Co single atom (COF-366-Co[subscript (H)]/Au) is developed via dual-ligand strategy and post-synthetic metallization method and found that this system significantly boosted up the CO2 photoreduction efficiency. It utilizes the plasmon-induced energetic electron transfer, enhanced light harvesting, and surface reactions to drive the photocatalytic redox reactions. The developed COF-366-Co[subscript (H)]/Au exhibited fine activity toward photocatalytic CO2 reduction under visible light irradiation, which yielded the CO at a rate up to ~1200 μmolg−1h−1 with a selectivity of 98% over H2.
Various books are available on photocatalysis systems based on bulk semiconducting materials. However, photocatalytic phenomena controlled by nanostructures are attractive beyond conventional semiconductors. This book is specifically devoted to the several novel uses of innovative organic, inorganic, and Metal-Organic Frameworks (MOFs)-based photocatalysts. Detailed discussion of synthesis methods, characterization techniques, and applications of advanced nanostructured photocatalysts is presented in the book. The conversion and storage of solar light is currently one of the most blooming interdisciplinary arenas of scientific technology converging various fields such as optics, physical chemistry, solid state physics, electrochemistry, photochemistry, catalysis, and several other research fields. The current textbook is intended to provide an outlook on the contemporary condition of photochemical systems for harvesting of solar light based on nanocrystalline semiconducting assemblies and materials. Different chapters of the book present an account on numerous aspects of such systems which include solar water splitting, photosynthetic procedures for reduction of CO2, evolution of molecular H2 and the photoelectrochemical organic substances based on nanoparticle semiconducting materials. A special attention is given to "nano" aspect of semiconducting photocatalytic materials, that is, the role of nanostructured crystals and the effect of their sizes in the conversion of solar energy, the design of semiconducting nanostructures with customized photochemical features, and the prospects of nanophotocatalysis systems based on heterogeneous photocatalytic materials. This book will inspire the researchers and readers to explore the novel design strategies for development of photocatalysts with customized nanostructures. Book jacket.
This book serves the environmentalists to track the development of photocatalytic materials and technology in the present context and to explore future trends. Photocatalysis is the most influential greener technology being researched, developed and adopted for the treatment of wastewater. The technological advancements in the area of smart hybrid photocatalytic materials have gained momentum in the present era. The rational designing of photocatalytic materials with a multi-pronged approach opens a new chapter for environmental detoxification. Other important aspects relate to the transfer of this nanostructured photocatalytic technology to real backdrops. Harnessing natural solar energy for energy and environmental roles is another crucial criterion in designing photocatalysts.
While books on semiconductor TiO2 photocatalysis are legion, nanostructured controlled photocatalysts are attractive beyond standard semiconductors, and this book is devoted to the many novel uses of advanced TiO2 and MOF-based photocatalysts. Details on synthesis, characterization, and reaction applications of nanostructured photocatalysts are summarized. Other new materials discussed in this book are Bi- W- oxides, metal complexes, and unique porous materials. This book contains methods of preparation and characterization of unique nanostructured photocatalysts, and details about their catalytic action. Contributors to this volume are leading Asian researchers in Photocatalysis. It will appeal to researchers wishing to know how to design new types of photocatalysts with controlled nanostructures.