The Photocatalytic and Antibacterial Activity of Copper-doped Titanium Dioxide Nanoparticles PDF Download
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Author: Naizhen Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Organic pollutants and pathogenic microbes exist in water systems causing many communities, especially in developing countries, to have a high risk of infection with water-borne diseases. Developing a simple, cost-effective, and efficient sunlight-driven water treatment technology is crucial for people to access clean and safe water. The most widely studied photoactive and antibacterial material is titanium dioxide (TiO2) nanoparticles (NPs). TiO2 NPs can produce highly reactive free radicals to oxidize organic pollutants and deactivate biological pollutants. However, pristine TiO2 NPs have a large band gap and only harvest solar radiation in the UV region. This thesis focuses on developing copper-doped titanium dioxide (TiCuxO2) catalysts and exploring its photocatalytic activity in the visible-light region. The first project focuses on synthesizing Cu-doped white TiO2 (wTiCuxO2) NPs using the solvothermal approach. The second project is a comprehensive study on Cu-doped black TiO2 (bTiCuxO2) NPs. The photocatalytic performance of the resulting TiCuxO2 catalysts (white and black particles) were evaluated using degradation of Rhodamine B (RhB) dye and disinfection of Escherichia coli (E. coli) under visible light irradiation. We show that introducing a Cu dopant and surface defects on the catalysts enhances its photodegradation ability. The mechanism of increased photocatalytic activity for TiCuxO2 is hypothesized to be due to band gap narrowing and accelerated charge separation. For disinfection ability, the activity might be related to the free Cu ions increasing the radical species under irradiation. In the project, I have developed two efficient photocatalysts for water treatment; the mechanistic studies of the nano-catalysts increase our understanding of the heterogeneous catalysts for photo-degradation of industrial dyes and inactivation of waterborne microbes, which are useful for engineering more efficient and sustainable water treatment devices.
Author: Naizhen Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Organic pollutants and pathogenic microbes exist in water systems causing many communities, especially in developing countries, to have a high risk of infection with water-borne diseases. Developing a simple, cost-effective, and efficient sunlight-driven water treatment technology is crucial for people to access clean and safe water. The most widely studied photoactive and antibacterial material is titanium dioxide (TiO2) nanoparticles (NPs). TiO2 NPs can produce highly reactive free radicals to oxidize organic pollutants and deactivate biological pollutants. However, pristine TiO2 NPs have a large band gap and only harvest solar radiation in the UV region. This thesis focuses on developing copper-doped titanium dioxide (TiCuxO2) catalysts and exploring its photocatalytic activity in the visible-light region. The first project focuses on synthesizing Cu-doped white TiO2 (wTiCuxO2) NPs using the solvothermal approach. The second project is a comprehensive study on Cu-doped black TiO2 (bTiCuxO2) NPs. The photocatalytic performance of the resulting TiCuxO2 catalysts (white and black particles) were evaluated using degradation of Rhodamine B (RhB) dye and disinfection of Escherichia coli (E. coli) under visible light irradiation. We show that introducing a Cu dopant and surface defects on the catalysts enhances its photodegradation ability. The mechanism of increased photocatalytic activity for TiCuxO2 is hypothesized to be due to band gap narrowing and accelerated charge separation. For disinfection ability, the activity might be related to the free Cu ions increasing the radical species under irradiation. In the project, I have developed two efficient photocatalysts for water treatment; the mechanistic studies of the nano-catalysts increase our understanding of the heterogeneous catalysts for photo-degradation of industrial dyes and inactivation of waterborne microbes, which are useful for engineering more efficient and sustainable water treatment devices.
Author: Sheng Yau Leong
Publisher:
ISBN:
Category : Process control
Languages : en
Pages : 44
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Book Description
Titanium dioxide (TiO2) is best known for its inexpensiveness and highly available as a photocatalyst. However, due to its wide-bandgap of 3.2 eV and the fast recombination of electron-hole pair, they have contributed to the inability to use the sunlight sufficiently as well as hindering for any reaction to happen. The objectives of the title are to synthesize a copper (Cu) doped TiO2, to inspect the photocatalytic activity of the synthesized TiO2 and to study the kinetic of the degradation of methylene blue (MB). A Cu salt is first synthesized using copper nitrate (Cu(NO3)) mixed in the glycerol phase. The preparation of TiO2 was carried out by the sol-gel method and the resulted Cu salt is added into it to in a 10 wt.% Cu/TiO2 manner. The resulted gel was aged for a day before it was heated up in the oven for 24 hours, which resulted in powder form. It was grinded and calcinated at 300 oC for an hour. The photocatalytic activity of the synthesized catalyst was inspected with the degradation of methylene blue (MB). As a result, the photocatalytic activity had been increased and the K0 ((k0H/K0)+ k0 is 0.03236 mg L-1 min-1 while K0 is 9.32615 X 10-3 4L mg-1.
Author: Akira Fujishima
Publisher:
ISBN: 9784939051036
Category : Photocatalysis
Languages : en
Pages : 176
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Book Description
Author: Aiguo Wu
Publisher: John Wiley & Sons
ISBN: 3527347240
Category : Science
Languages : en
Pages : 252
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Book Description
A unique book that summarizes the properties, toxicology, and biomedical applications of TiO2-based nanoparticles Nanotechnology is becoming increasingly important for products used in our daily lives. Nanometer-sized titanium dioxide (TiO2) are widely used in industry for different purposes, such as painting, sunscreen, printing, cosmetics, biomedicine, and so on. This book summarizes the advances of TiO2 based nanobiotechnology and nanomedicine, covering materials properties, toxicological research, and biomedical application, such as antibacter, biosensing, and cancer theranostics. It uniquely integrates the TiO2 applications from physical properties, toxicology to various biomedical applications, and includes black TiO2 based cancer theranostics. Beginning with a comprehensive introduction to the properties and applications of nanoparticles, TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine offers chapters on: Toxicity of TiO2 Nanoparticles; Antibacterial Applications of TiO2 Nanoparticles; Surface Enhanced Raman Spectrum of TiO2 Nanoparticle for Biosensing (TiO2 Nanoparticle Served as SERS Sensing Substrate); TiO2 as Inorganic Photosensitizer for Photodynamic Therapy; Cancer Theranostics of Black TiO2 Nanoparticles; and Neurodegenerative Disease Diagnostics and Therapy of TiO2-Based Nanoparticles. This title: -Blends the physical properties, toxicology of TiO2 nanoparticles to the many biomedical applications -Includes black TiO2 based cancer theranostics in its coverage -Appeals to a broad audience of researchers in academia and industry working on nanomaterials-based biosensing, drug delivery, nanomedicine TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine is an ideal book for medicinal chemists, analytical chemists, biochemists, materials scientists, toxicologists, and those in the pharmaceutical industry.
Author: Mohamed A. Barakat
Publisher: Springer
ISBN: 3319242717
Category : Science
Languages : en
Pages : 39
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Book Description
In this brief, a comprehensive review of the UV/visible-TiO2 photocatalytic oxidation process is presented with an insight into the mechanisms involved, the role of titanium dioxide as a catalyst, irradiation sources, types of reactors, and a comparison between various modes of TiO2 application. An overview of the development and enhancement of the activity of TiO2 nanoparticles in photocatalysis is presented. The topics covered include a detailed look at the unique properties of the TiO2 nanoparticles and their relationship to photocatalytic properties. The utilization of the TiO2 nanoparticles as photocatalysts, in the non-doped and doped forms is also reviewed. Finally, the use of modified TiO2 nanoparticles has made a significant contribution in providing definitive mechanistic information regarding the visible light photocatalytic processes.
Author: Atsile Rosy Ocwelwang
Publisher:
ISBN:
Category : Chitosan
Languages : en
Pages : 190
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Book Description
Author: Vladimiro Dal Santo
Publisher: MDPI
ISBN: 3038976946
Category : Science
Languages : en
Pages : 208
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Book Description
Although the seminal work of Fujishima et al. dates back to 1971, TiO2 still remains the most diffused and studied semiconductor, employed in photo-oxidation processes for cleantech (i.e., polluted water and air treatment), in solar fuel production (mainly hydrogen production by water photo splitting), and in Carbon Capture and Utilization (CCU) processes by CO2 photoreduction. The eleven articles, among them three reviews, in this book cover recent results and research trends of various aspects of titanium dioxide photocatalysis, with the chief aim of improving the final efficiency of TiO2-based materials. Strategies include doping, metal co-catalyst deposition, and the realization of composites with plasmonic materials, other semiconductors, and graphene. Photocatalysts with high efficiency and selectivity can be also obtained by controlling the precise crystal shape (and homogeneous size) and the organization in superstructures from ultrathin films to hierarchical nanostructures. Finally, the theoretical modeling of TiO2 nanoparticles is discussed and highlighted. The range of topics addressed in this book will stimulate the reader’s interest as well as provide a valuable source of information for researchers in academia and industry.
Author: Haya Abdel Raouf Ahmed
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 220
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Book Description
The goal of this work was to improve the performance of TiO2 nanomaterials by increasing their optical activities by shifting the onset of the response from the UV to the visible-light region. Among the several ways to achieve this goal, doping TiO2 nanomaterials with other elements (e.g. metals) was selected to narrow the band gap and enhance the optical properties of TiO2 nanomaterials. In this work, we have prepared Cu-doped TiO2 and Ag-doped TiO2 nano-catalysts, characterized them and studied their properties, and the optical ones in particular. The Ag-doped TiO2 catalyst was prepared by the sol-gel method while the Cu-doped TiO2 catalyst was prepared by using two different techniques for comparison purposes: the sol-gel method and the inert gas condensation technique under ultra-high vacuum. The Ag-doped TiO2 nano-catalysts prepared by the sol-gel method were characterized by using Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM) and Electron Probe Micro-Analyser (EPMA) for surface morphology and chemical composition, Brunauer-Emmett-Teller (BET) analysis for surface area and porosity measurements, X-ray diffraction (XRD) to determine their crystal structure and UV-visible absorption spectrometry (UV-Vis) to measure the optical properties. The same characterization methods have been applied on the Cudoped TiO2 photocatalysts prepared by the sol-gel method, in addition to some rheological measurements to determine their flow behaviour. Furthermore, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV-visible absorption spectrometry (UV-Vis) analyses have been conducted to characterize the Cu-doped TiO2 catalysts prepared by the inert gas condensation technique. vii The experimental work conducted here revealed promising results for improving the performance of the TiO2 nano material by doping it with Cu and Ag metals where the optical activity was enhanced and shifted to the visible region causing an appreciable increase in its effectiveness for photo catalytic applications.
Author: Aparna B. Gunjal
Publisher: Nova Science Publishers
ISBN: 9781685074661
Category : Science
Languages : en
Pages : 138
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Book Description
This book, titled Titanium Dioxide: Advances in Research and Applications, deals with important aspects of applications of titanium dioxide and recent developments in the areas of research of titanium dioxide. There are 5 chapters in this book contributed by various authors. Chapter 1 deals with applications of titanium dioxide in space and its photocatalytic activity in a vacuum environment. Chapter 2 mentions various applications of titanium dioxide in the biomedical field, such as in bone implantation, immobilization of drug carriers, and in cancer therapy as well as in environmental remediation, such as degradation of hazardous pollutants and treatment of wastewater. Chapter 3 deals with doped titanium dioxide nanostructures for visible light driven photo catalysis. The applications of visible light on active titanium dioxide photocatalysts for degradation of various toxic pollutants are described. Chapter 4 deals in detail with various methods of biosynthesis of titanium dioxide nanoparticles and their antibacterial activity. Chapter 5 describes preparation of titanium dioxide nonmaterials, their forensic applications, and fingerprint imaging. The book Titanium Dioxide: Advances in Research and Applications will be of immense use to students, professors and researchers of various colleges, universities and research institutes. It will increase knowledge regarding the synthesis, applications and various aspects of titanium dioxide.
Author: Rakshit Ameta
Publisher: CRC Press
ISBN: 1482254948
Category : Science
Languages : en
Pages : 340
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Book Description
Photocatalysis, reactions carried out in the presence of a semiconductor and light, is rapidly becoming one of the most active areas of chemical research, with applications in areas such as electrochemistry, medicine, and environmental chemistry, Photocatalysis: Principles and Applications stresses the development of various types of photocatalytic semiconductors, including binary, ternary, quaternary, and composite, and their modifications by metallization, sensitization, and doping to enhance their photocatalytic activities. In addition to describing the principles and mechanisms of photocatalysis, it also discusses other possible applications of photocatalysis such as use as antifouling agents, controlling air pollution by degrading contaminants present in the environment, self-cleaning of glasses and tiles in the presence of light/artificial light, green composites, wastewater treatment, hydrogen generation, and inactivation of microorganisms. The book also describes medical applications and summarizes efforts in the field of photosplitting of water as a newer energy source and photoreduction of carbon dioxide for providing synthetic fuels and also a step towards mimicking photosynthesis. Introduces the basic principle of photocatalysis. Provides an overview of the types of semiconductors, their immobilization, and modifications to make them more active. Gives possible applications of photocatalysis in wastewater treatment and strategy to combat against different kinds of pollutions like water, air, and soil. Summarizes efforts in the field of photosplitting of water as a newer energy source and photoreduction of carbon dioxide for providing synthetic fuels and as a step towards mimicking photosynthesis. Discusses inactivation of different kinds of microorganisms. Covers medical applications. Features Introduces the basic principle of photocatalysis. Provides an overview of the types of semiconductors, their immobilization, and modifications to make them more active. Gives possible applications of photocatalysis in wastewater treatment and strategy to combat against different kinds of pollutions like water, air, and soil. Summarizes efforts in the field of photosplitting of water as a newer energy source and photoreduction of carbon dioxide for providing synthetic fuels and as a step towards mimicking photosynthesis. Discusses inactivation of different kinds of microorganisms. Covers medical applications.
