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Download or read book Use of Cysteine-modified TiO2 Photocatalyst for Treatment of Combined Organic written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (683 download)
Download or read book Combined Photooxidation written by and published by . This book was released on 1995 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) colloids prepared from titanium chloride (TiCl4) were used as photocatalysts in the experiments. Cysteine was selected as the model derivative for the surface modification of the TiO2 nanoparticles. Testing of TiO2 photocatalysts conducted in the absence of organic compounds demonstrated that adsorption of lead ions occurred in the system with either untreated (virgin) or treated (modified using cysteine) TiO2 photocatalysts. Adsorption rates of the metal ions in the systems that used treated TiO2 photocatalysts were about three times faster than those where untreated TiO2 photocatalysts were used. Lead ion concentrations in the irradiated solutions decreased as the UV irradiation time increased; greater metal removals were achieved at longer irradiation times. The rate of decreasing lead ion concentrations in the system that used treated TiO2 photocatalysts was about two to three times faster than that in the system using untreated TiO2 photocatalysts. Experiments were also performed in which organic compounds (naphthalene or phenol) and heavy metals (Pb{sup 2+}) were simultaneously treated with TiO2 photocatalysts. The presence of lead ions did not interfere with the photo-degradation of the selected organic compounds from solution. The presence of phenol compound appeared not to affect the photoreduction of lead ions, while addition of naphthalene compound resulted in a lag-time effect on the photoreduction of lead ions from solution. All of the experimental results showed that the cysteine-modified TiO2 resulted in faster and more effective removal than that for the untreated TiO2 system. This technique has resulted in the simultaneous photocatalytic removal/recovery of organic and inorganic compounds in the system.
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (16 download)
Download or read book Combined Photooxidation/photoreduction Using TiO{sub 2} Photocatalysts to Treat Organic/inorganic Metal-laden Wastewaters written by and published by . This book was released on 1995 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) colloids prepared from titanium chloride (TiCl4) were used as photocatalysts in the experiments. Cysteine was selected as the model derivative for the surface modification of the TiO2 nanoparticles. Testing of TiO2 photocatalysts conducted in the absence of organic compounds demonstrated that adsorption of lead ions occurred in the system with either untreated (virgin) or treated (modified using cysteine) TiO2 photocatalysts. Adsorption rates of the metal ions in the systems that used treated TiO2 photocatalysts were about three times faster than those where untreated TiO2 photocatalysts were used. Lead ion concentrations in the irradiated solutions decreased as the UV irradiation time increased; greater metal removals were achieved at longer irradiation times. The rate of decreasing lead ion concentrations in the system that used treated TiO2 photocatalysts was about two to three times faster than that in the system using untreated TiO2 photocatalysts. Experiments were also performed in which organic compounds (naphthalene or phenol) and heavy metals (Pb{sup 2+}) were simultaneously treated with TiO2 photocatalysts. The presence of lead ions did not interfere with the photo-degradation of the selected organic compounds from solution. The presence of phenol compound appeared not to affect the photoreduction of lead ions, while addition of naphthalene compound resulted in a lag-time effect on the photoreduction of lead ions from solution. All of the experimental results showed that the cysteine-modified TiO2 resulted in faster and more effective removal than that for the untreated TiO2 system. This technique has resulted in the simultaneous photocatalytic removal/recovery of organic and inorganic compounds in the system.
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ISBN 13 :
Total Pages : 802 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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ISBN 13 :
Total Pages : 534 pages
Book Rating : 4.0/5 ( download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Armando M. Lacerda
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Modified TiO2 Photocatalysts for the Degradation of Organic Pollutants and H2 Generation Via Solar Energy Conversion written by Armando M. Lacerda and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anne Wanjira Mbiri
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (19 download)
Download or read book Photocatalytic Degradation of Selected Organic Pollutants in Water on Zirconium Modified TiO2 Photocatalyst written by Anne Wanjira Mbiri and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Herein, we report enhanced photocatalytic activity of mesoporous TiO2 powder and thin films towards degradation of organic pollutants in water due to their modification with zirconium. Catalysts were prepared by sol-gel and EISA methods while thin films were prepared using EISA via dip-coating. Characterization was carried out using different methods and effects of Zr on the morphology, structure, crystallinity and photoactivity of the catalyst investigated. Incorporation of Zr to Ti positions in the TiO2 crystal lattice enhanced charge separation, improved surface area, increased stability of anatase phase and controlled the crystal growth. Zr modified TiO2 catalysts showed higher photocatalytic activity compared to pure TiO2 catalyst. The results show that modification of TiO2 with Zr is a promising method in improving photocatalytic activity of TiO2 towards degradation of organic pollutants. engl.
Author : Mikaela Shand
Publisher :
ISBN 13 :
Total Pages : 372 pages
Book Rating : 4.:/5 (111 download)
Download or read book Simultaneous Removal of Nitrate and Organics Over Modified TIO2 Photocatalysts written by Mikaela Shand and published by . This book was released on 2016 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Aiguo Wu
Publisher : John Wiley & Sons
ISBN 13 : 3527347240
Total Pages : 252 pages
Book Rating : 4.5/5 (273 download)
Download or read book TiO2 Nanoparticles written by Aiguo Wu and published by John Wiley & Sons. This book was released on 2020-06-02 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Narmina Balayeva
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Visible-light-driven Photocatalytic Organic Synthesis with Surface Modified TiO2-composites written by Narmina Balayeva and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 307 pages
Book Rating : 4.:/5 (663 download)
Download or read book Understanding and Modifying TiO 2 for Aqueous Organic Photodegradation written by and published by . This book was released on 2005 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis with semiconductor has recently emerged as an advanced oxidation process for environmental decontamination. It is safe and versatile, and consumes only light. It is very promising for solving the environmental problems in the most economic way. TiO2 of anatase phase has proven to be the most promising semiconductor photocatalyst for widespread environmental applications because it shows a high reactivity under ultraviolet (UV) light and it is nontoxic, stable and inert chemically. However, anatase TiO2 has a band gap of 3.2eV. This limits its application under sunlight as well as providing its high reactivity because the light with the energy larger than 3.2eV (corresponding to a wavelength of 387nm) constitutes only 3︢︣4% of the energy of solar light reaching the earth. TiO2 of rutile phase is claimed as catalytically inactive or much less active for organic compound photodegradation although it has a smaller band gap (3.0eV) corresponding to a wavelength of 413nm. Therefore, modifications of TiO2 are needed to allow TiO2 to efficiently utilize the solar spectrum. The present dissertation aims at developments of the photocatalysts which can work under visible light. One method used in the study was modification of rutile TiO2 by surface platinization. The experimental results indicate that Pt can act as a bridge for electrons created in rutile TiO2 to transfer to O2, which enables rutile TiO2's photoactivity under visible light. Roles of Pt deposited on anatase and anatase-rutile TiO2 for aqueous organic photooxidation were also investigated experimentally and theoretically. The other method used was modification of TiO2 with transition metal ions. MCM-41, a kind of mesoporous material, was used as a host for incorporation of transition metal ions (Cr, V, Fe, Cu, Mn, Co, Ni, Mo and La) and TiO2 loading. Only Cr6+ was found to be able to sensitize TiO2 for organic degradatoin under visible light. Two other mesoporous materials (MCM-48, and SBA-15) with different pore sizes and dimensionalities were also studied as supports for Cr6+ and TiO2. MCM-41 was found to be the best for visible light photocatalyst development. Cr6+ concentration in TiO2-loaded Cr-incorporated MCM-41 was parametrically investigated and the optimal atomic ratio of Si to Cr was 20. The catalyst deactivates with reation time; the deactivated catalyst can be 100% reactivated by recalcination under 450 C. Cr leaching is minimal when the catalyst deactivates completely after reaction. What is more, the synergistic effect between anatase and rutile titanias named in the literature was investigated with different kinds of titanias. A technique was discovered for removal of organics containing acid and/or phenolic groups under visible light by using commercial pristine TiO2. Conclusively, it has been shown that visible light utilization for aqueous organic oxidation can be achieved by modification of TiO2 with surface platinization or Cr6+ incorporation.
Author : Zahra Shayegan
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Modification of Titanium Dioxide for Photocatalytic Degradation of Indoor Volatile Organic Compounds written by Zahra Shayegan and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The indoor air quality (IAQ) concern has risen since people spend most of their time (>90%) in indoor environments. Volatile organic compounds (VOCs) are categorized as a major group of gas pollutants. Indoor VOCs, known as hazardous compounds with several proven adverse health effects. Among various purification techniques, a heterogeneous photocatalytic oxidation process (PCO) is a promising technology for removing indoor VOC contaminants. Titanium dioxide (TiO2) is the leading candidate for PCO given its unique properties. However, no TiO2-based photocatalysts completely satisfy all practical requirements, considering the photoexcited charge carriers' short lifetime and a wide band gap requiring ultraviolet (UV) radiation. Moreover, the application of PCO for VOCs degradation is greatly hindered at high humidity levels. Herein, TiO2 modification techniques that include approaches for overcoming the inherent TiO2 limitations and improving the photocatalytic degradation of VOCs are studied. In this research, strategies for improving TiO2 photocatalyst activities by doping with different metal and/or non-metal ions as well as surface modification have been examined. Accordingly, the adsorption capacity and photocatalytic activity of P25 and surface fluorinated P25 coated on nickel foam were evaluated for VOCs removal. In addition, the photoactivity of visible-light-driven photocatalysts including; anatase/rutile carbon-doped P25, anatase/brookite cerium-doped TiO2, and anatase/brookite iron-doped TiO2 coated on nickel foam were evaluated for degradation of VOCs under both UV and visible light irradiation. Surface fluorination was then applied to reduce the surface hydrophilicity of Ce-TiO2 and Fe-TiO2 photocatalysts with the optimum Ce and Fe contents. Notably, their photocatalytic performance was investigated in continuous flow mode-of-operation reactors with small residence time, different relative humidity levels, and low-level inlet contaminant concentration. These techniques can improve PCO performance through the following mechanisms: i) by introducing an electron capturing level in the band gap that would generate some defects in the TiO2 lattice and help capture charge carriers and can also be excited under visible irradiation; ii) by slowing down the charge carrier recombination rate and increasing VOCs degradation; and iii) by reducing the surface hydrophilicity, which increases VOCs' adsorption capacity at high humid conditions.
Author : Anuj Kumar
Publisher : CRC Press
ISBN 13 : 1040113583
Total Pages : 335 pages
Book Rating : 4.0/5 (41 download)
Download or read book 2D Semiconducting Materials for Electronic, Photonic, and Optoelectronic Devices written by Anuj Kumar and published by CRC Press. This book was released on 2024-11-07 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional semiconducting materials (2D-SCMs) are the subject of intensive study in the fields of photonics and optoelectronics because of their unusual optical, electrical, thermal, and mechanical properties. The main objective of 2D Semiconducting Materials for Electronic, Photonic, and Optoelectronic Devices is to provide current, state-of-the-art knowledge of two-dimensional semiconducting materials for various applications. Two-dimensional semiconducting materials are the basic building blocks for making photodiodes, light-emitting diodes, light-detecting devices, data storage, telecommunications, and energy-storage devices. When it comes to two-dimensional semiconducting materials, electronic, photonic, and optoelectronic applications, as well as future plans for improving performance, no modern book covers as much ground. The planned book will fill such gaps by offering a comprehensive analysis of two-dimensional semiconducting materials. This book covers a range of advanced 2D materials, their fundamentals, and the chemistry for many emerging applications. All the chapters are covered by experts in these areas around the world, making this a suitable textbook for students and providing new guidelines to researchers and industries. • Covers topics such as fundamentals and advanced knowledge of two-dimensional semiconducting materials • Provides details about the recent methods used for the synthesis, characterization, and applications of two-dimensional semiconducting materials • Covers the state-of-the-art development in two-dimensional semiconducting materials and their emerging applications This book provides directions to students, scientists, and researchers in semiconductors and related disciplines to help them better understand the physics, characteristics, and applications of 2D semiconductors.
Author : Suresh C. Ameta
Publisher : Academic Press
ISBN 13 : 0128105259
Total Pages : 430 pages
Book Rating : 4.1/5 (281 download)
Download or read book Advanced Oxidation Processes for Wastewater Treatment written by Suresh C. Ameta and published by Academic Press. This book was released on 2018-02-19 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Oxidation Processes for Waste Water Treatment: Emerging Green Chemical Technology is a complete resource covering the fundamentals and applications of all Advanced Oxidation Processes (AOPs). This book presents the most up-to-date research on AOPs and makes the argument that AOPs offer an eco-friendly method of wastewater treatment. In addition to an overview of the fundamentals and applications, it details the reactive species involved, along with sections on reactor designs, thus helping readers understand and implement these methods. Presents in-depth coverage of all types of Advanced Oxidation Processes, including Super Critical Water Oxidation, Photo-Fenton and Like Processes Includes a fundamental review, applications, reactive species and reactor designs Reviews applications across waste types, including industrial waste, domestic and municipal sewage, and hospital wastes
Author : Maulin P Shah
Publisher : CRC Press
ISBN 13 : 1000546632
Total Pages : 298 pages
Book Rating : 4.0/5 (5 download)
Download or read book Advanced Oxidation Processes for Wastewater Treatment written by Maulin P Shah and published by CRC Press. This book was released on 2022-03-09 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Oxidation Processes for Wastewater Treatment: An Innovative Approach: This book highlights the importance of various innovative advanced oxidation technology to clean up the environment from pollution caused by human activities. It assesses the potential application of several existing bioremediation techniques and introduces new emerging technologies. This book is an updated vision of the existing advanced oxidation strategies with their limitations and challenges and their potential application to remove environmental pollutants. It also introduces the new trends and advances in environmental bioremediation technology with thorough discussion of recent developments in this field. This book highlights the importance of different innovative advanced oxidation process to deal with the ever-increasing number of environmental pollutants. Features: Illustrates the importance of various advance oxidation processes in effluent treatment plant Points out the reuse of the treated wastewater through emerging advance oxidation technologies for effluent treatment plant Highlights the recovery of resources from wastewater Pays attention to the occurrence of novel micro-pollutants Emphasizes the role of nanotechnology in bioremediation of pollutants Introduces new trends in environmental bioremediation
Author : Aracely Hernández-Ramírez
Publisher : Springer
ISBN 13 : 3319109995
Total Pages : 298 pages
Book Rating : 4.3/5 (191 download)
Download or read book Photocatalytic Semiconductors written by Aracely Hernández-Ramírez and published by Springer. This book was released on 2014-11-17 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This critical volume examines the different methods used for the synthesis of a great number of photocatalysts, including TiO2, ZnO and other modified semiconductors, as well as characterization techniques used for determining the optical, structural and morphological properties of the semiconducting materials. Additionally, the authors discuss photoelectrochemical methods for determining the light activity of the photocatalytic semiconductors by means of measurement of properties such as band gap energy, flat band potential and kinetics of hole and electron transfer. Photocatalytic Semiconductors: Synthesis, Characterization and Environmental Applications provide an overview of the semiconductor materials from first- to third-generation photocatalysts and their applications in wastewater treatment and water disinfection. The book further presents economic and toxicological aspects in the production and application of photocatalytic materials.
Author : Olusola Olaitan Ayeleru
Publisher : Elsevier
ISBN 13 : 0443217955
Total Pages : 828 pages
Book Rating : 4.4/5 (432 download)
Download or read book Smart Nanomaterials for Environmental Applications written by Olusola Olaitan Ayeleru and published by Elsevier. This book was released on 2024-09-09 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart nanomaterials are making their presence ever so noticeable in areas like environmental protection and remediation, as well as in many other fields of study. The international team of expert researchers behind Smart Nanomaterials for Environmental Applications aims to spotlight the latest, rapid developments in the design and manipulation of materials at the nanoscale and to concisely present information regarding their novel methods of utilization for the safeguard of the environment, while at the same time apprising readers of challenges encountered and anticipated prospects. The volume illustrates state-of-the-art, actionable content, which is relevant and extremely valuable for those who want to apply this up-to-date knowledge in industry too. Offers fundamentals of smart nanomaterials, including characterization, design, and fabrication methods Includes advanced information on fine-tuning different morphologies of smart nanomaterials Features three case studies on real-life applications of smart nanomaterials
