Electrodeposition of Titanium, Tungsten and Zinc Layered Oxides as Photocatalysts for the Degradation of Benzene-toluene-xylene in Aqueous Phase PDF Download
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Author: Chien Ju Lee
Publisher:
ISBN:
Category : Environmental degradation
Languages : en
Pages : 143
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Book Description
Author: Chien Ju Lee
Publisher:
ISBN:
Category : Environmental degradation
Languages : en
Pages : 143
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Book Description
Author: Hazlini Mohmad Ameran
Publisher:
ISBN:
Category : Metal oxide semiconductors
Languages : en
Pages : 102
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Book Description
Author: Zul Adlan Mohd. Hir
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 131
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Book Description
Author: Mahmoud Sadeghi
Publisher:
ISBN:
Category : Benzene
Languages : en
Pages : 348
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Book Description
Author: Mario J. Muñoz-Batista
Publisher: Springer Nature
ISBN: 3030494926
Category : Science
Languages : en
Pages : 301
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Book Description
The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field. The chapter "Mechanochemical Forces as a Synthetic Tool for Zero and One-Dimensional Titanium Oxide-Based Nano-photocatalysts" is available open access under a CC BY 4.0 License via link.springer.com.
Author: Junzhe Dong
Publisher:
ISBN:
Category : Electrochemistry
Languages : en
Pages : 190
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Book Description
n the past few decades, transition metal oxides (TMO) show various unique properties and wide applications due to their electronic configuration and multiple possible structures. Among different TMO, titanium dioxide (TiO2), tungsten trioxide(WO3), and zinc oxide (ZnO) are most commonly oxides used as catalyst, sensors and electric devices due to their unique physical and chemical properties. Electrochemical anodization is a facile and cost-effective way to produce 1D self-assembly metal oxides,which integrates the advantage of larger surface area, short diffusion path, low quantum confinement, high charge transfer efficiency and tunable electronic structures. Post-annealing is a possible way to rearrange the disordered atomic arrangement of the anodic oxides and tune their electronic structure. In addition, the decoration of the anodic oxides with metal nanoparticles is another efficient way to modify the as-synthesized anodic oxides, which helps supress the recombination of the photogenerated charge carriers and prolong their life time. The as-prepared and modified anodic metal oxides exhibit various applications, including the photocatalyst, electrochemical catalyst and SERS substrates.The pre-treatment of the Ti substrate and electrolyte were conducted before formal anodization. Their influence on the morphology and mechanical properties of the anodic TiO2 were discussed. The results indicated that the regular TiO2 NTs with the hierarchical shape was produced on the patterned Ti substrate prepared by two-step anodization. Although the regularity of TiO2 NTs improved a lot with the increase of aging time, the pore size decreased as well as the surface homogeneity. The nanohardness and reduced modulus showed the obvious increase with the aging time and highest adhesion between TiO2 and Ti substrate was achieved by anodizing in the 25 h aging electrolyte. Anodic TiO2 initially has an amorphous structure and crystallizes into anatase after thermal annealing. High resolution transmission electron microscopy and in situ synchrotron X-ray diffraction were employed to study the dynamic phase transformation process and the effect of annealing parameters on the atomic structure. At temperatures above 330°C the crystallization process began immediately and ceased within ~500 s. The material was not fully crystallized (crystallinity only ~70 wt.%), even when the annealing time was prolonged to 7000 s at an elevated temperature. The incomplete crystallization could be ascribed to the effect of grain boundaries, oxygen vacancies, and fluorine ions. Besides the phase structure change of anodic TiO2 after annealing, the electric resistivity and wettability of the TiO2 were found to have a close relationship with the post heat treatment. The as-synthesized and annealed TiO2 were used as the electroplating substrate for fabrication Ni-TiO2 nanocomposite. The results reveal that the deposited Ni grows inside the nanotube on annealed TiO2 substrate, while it only forms a compact layer on the top of as-anodized. The resultant Ni-TiO2 nanocomposite on annealed TiO2 substrates also exhibited better oxygen evolution performance than on amorphous substrates in terms of low overpotential at a current density of 10 mA/cm2 and small Tafel slope. The modification of TiO2 can also be achieved by a novel technique that combines magnetron sputtering and thermal dewetting. The obtained Cu-TiO2 nanocomposite catalyst exhibited 4-fold increase in the photodegradation rate of methylene blue aqueous solution under solar light irradiation than anatase TiO2 prepared with sameanodization conditions. The enhanced photocatalytic activity was attributed to thesynergistic effect of Schottky barrier and surface plasmon resonance.Similar to anodic TiO2, regular self-organized nanoporous WO3 was prepared through anodization in the electrolyte containing ethylene glycol, ammonium fluoride and DI water, which was subsequently used as a template for deposition of Ag nanoparticles by magnetron sputtering and thermal dewetting. The synthesized Ag-WO3 nanocomosites showed large SERS enhancement factor of ~2.1× 107 and a low detection limit of ~1× 10-6 M Rhodamine B. The visible light responding behaviour of WO3, synergistic interaction between Ag nanoparticles and the WO3 substrate, and the plasmonic behaviour of Ag collectively contribute to the enhanced Raman scattering. Although TiO2 nanotube and WO3 nanoporous structure can be successfully prepared in the ethylene glycol electrolyte containing the NH4F, it did not work for anodic ZnO. A new type of self-assembled Zinc oxide (ZnO) nanostructure has been prepared by electrochemical anodization of Zinc foil in NaOH aqueous electrolyte. The experimental results indicate that the primary factor affecting anodic nanostructure is the applied voltage, while anodization time and electrolyte concentration also play significant roles in tailoring nanorod morphology.
Author: Leonardo Palmisano
Publisher: Elsevier
ISBN: 0128242426
Category : Technology & Engineering
Languages : en
Pages : 488
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Book Description
Photoelectrocatalysis: Fundamentals and Applications presents an in-depth review of the topic for students and researchersworking on photoelectrocatalysis-related subjects from pure chemistry to materials and environmental chemistry inorder to propose applications and new perspectives. The main advantage of a photoelectrocatalytic process is the mildexperimental conditions under which the reactions are carried out, which are often possible at atmospheric pressure androom temperature using cheap and nontoxic solvents (e.g., water), oxidants (e.g., O2 from the air), catalytic materials (e.g.,TiO2 on Ti layer), and the potential exploitation of solar light. This book presents the fundamentals and the applications of photoelectrocatalysis, such as hydrogen production fromwater splitting, the remediation of harmful compounds, and CO2 reduction. Photoelectrocatalytic reactors and lightsources, in addition to kinetic aspects, are presented along with an exploration of the relationship between photocatalysisand electrocatalysis. In addition, photocorrosion issues and the application of selective photoelectrocatalytic organictransformations, which is now a growing field of research, are also reported. Finally, the advantages/disadvantages andfuture perspectives of photoelectrocatalysis are highlighted through the possibility of working at a pilot/industrial scale inenvironmentally friendly conditions. Presents the fundamentals of photoelectrocatalysis Outlines photoelectrocatalytic green chemistry Reviews photoelectrocatalytic remediation of harmful compounds, hydrogen production, and CO2 reduction Includes photocorrosion, photoelectrocatalytic reactors, and modeling along with kinetic aspects
Author: Innocent Udom
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 116
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Book Description
This research investigated the supported semiconductor photocatalysts (TiO2 and ZnO), particularly ZnO nanorods and nanowires, their synthesis methods, properties and corresponding effectiveness in photocatalysis. The effect of transition metal co-catalysts on the photocatalytic properties of TiO2 was investigated. Although TiO2 is the most extensively studied photocatalyst for water decontamination, ZnO, as presented in this work, could be a substitute because of its lower cost, relative energy bandgap and higher visible light photoactivity. Both photocatalysts were doped and screened for the decomposition of model contaminates, rhodamine B (RhB), phenol and methyl orange, under ultraviolet and/or visible light irradiation. In the photodegradation of RhB, TiO2/Ru 1% showed a superior photocatalytic activity relative to P25-TiO2 under broad-band irradiation, while doped ZnO-Ag resulted in better photodegradation of methyl orange, compared to P25-TiO2, under visible light irradiation.
Author: Juan Carlos Colmenares
Publisher: Springer
ISBN: 3662487195
Category : Science
Languages : en
Pages : 419
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Book Description
The book explains the principles and fundamentals of photocatalysis and highlights the current developments and future potential of the green-chemistry-oriented applications of various inorganic, organic, and hybrid photocatalysts. The book consists of eleven chapters, including the principles and fundamentals of heterogeneous photocatalysis; the mechanisms and dynamics of surface photocatalysis; research on TiO2-based composites with unique nanostructures; the latest developments and advances in exploiting photocatalyst alternatives to TiO2; and photocatalytic materials for applications other than the traditional degradation of pollutants, such as carbon dioxide reduction, water oxidation, a complete spectrum of selective organic transformations and water splitting by photocatalytic reduction. In addition, heterogeneized polyoxometalate materials for photocatalytic purposes and the proper design of photocatalytic reactors and modeling of light are also discussed. This book appeals to a wide readership of the academic and industrial researchers and it can also be used in the classroom for undergraduate and graduate students focusing on heterogeneous photocatalysis, sustainable chemistry, energy conversion and storage, nanotechnology, chemical engineering, environmental protection, optoelectronics, sensors, and surface and interface science. Juan Carlos Colmenares is a Professor at the Institute of Physical Chemistry, Polish Academy of Sciences, Poland. Yi-Jun Xu is a Professor at the State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, China.
Author: Juan M. Coronado
Publisher: Springer Science & Business Media
ISBN: 1447150619
Category : Technology & Engineering
Languages : en
Pages : 352
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Book Description
Research for the development of more efficient photocatalysts has experienced an almost exponential growth since its popularization in early 1970’s. Despite the advantages of the widely used TiO2, the yield of the conversion of sun power into chemical energy that can be achieved with this material is limited prompting the research and development of a number of structural, morphological and chemical modifications of TiO2 , as well as a number of novel photocatalysts with very different composition. Design of Advanced Photocatalytic Materials for Energy and Environmental Applications provides a systematic account of the current understanding of the relationships between the physicochemical properties of the catalysts and photoactivity. The already long list of photocatalysts phases and their modifications is increasing day by day. By approaching this field from a material sciences angle, an integrated view allows readers to consider the diversity of photocatalysts globally and in connection with other technologies. Design of Advanced Photocatalytic Materials for Energy and Environmental Applications provides a valuable road-map, outlining the common principles lying behind the diversity of materials, but also delimiting the imprecise border between the contrasted results and the most speculative studies. This broad approach makes it ideal for specialist but also for engineers, researchers and students in related fields.
