Development of TiO2 photocatalysts suitable for practical use and their applications in environmental cleanup

Taoda, Hiroshi

doi:10.1163/156856708784040579

Cited by 33 publications

(19 citation statements)

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“…Self‐cleaning coatings have become a major focus in recent years 4, 9–11, 118–127. These coatings can be characterized into two main types: superhydrophobic films119, 128–139 or photoactive films 24, 120, 140.…”

Section: Coatings That Prevent Protein Foulingmentioning

confidence: 99%

“…TiO 2 can decompose a wide range of contaminants, such as stearic acid121, 122, 146 and gaseous formaldehyde,147 and can keep itself clean under UV as well as visible light. Due to its self‐cleaning action, TiO 2 has been coated onto different types of surfaces, including glass,121, 122, 147, 148 textiles,9, 11 and catheters,4 and has been used extensively for environmental clean‐up 123…”

Section: Coatings That Prevent Protein Foulingmentioning

confidence: 99%

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Antifouling Coatings: Recent Developments in the Design of Surfaces That Prevent Fouling by Proteins, Bacteria, and Marine Organisms

2010

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The major strategies for designing surfaces that prevent fouling due to proteins, bacteria, and marine organisms are reviewed. Biofouling is of great concern in numerous applications ranging from biosensors to biomedical implants and devices, and from food packaging to industrial and marine equipment. The two major approaches to combat surface fouling are based on either preventing biofoulants from attaching or degrading them. One of the key strategies for imparting adhesion resistance involves the functionalization of surfaces with poly(ethylene glycol) (PEG) or oligo(ethylene glycol). Several alternatives to PEG-based coatings have also been designed over the past decade. While protein-resistant coatings may also resist bacterial attachment and subsequent biofilm formation, in order to overcome the fouling-mediated risk of bacterial infection it is highly desirable to design coatings that are bactericidal. Traditional techniques involve the design of coatings that release biocidal agents, including antibiotics, quaternary ammonium salts (QAS), and silver, into the surrounding aqueous environment. However, the emergence of antibiotic- and silver-resistant pathogenic strains has necessitated the development of alternative strategies. Therefore, other techniques based on the use of polycations, enzymes, nanomaterials, and photoactive agents are being investigated. With regard to marine antifouling coatings, restrictions on the use of biocide-releasing coatings have made the generation of nontoxic antifouling surfaces more important. While considerable progress has been made in the design of antifouling coatings, ongoing research in this area should result in the development of even better antifouling materials in the future.

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Section: Coatings That Prevent Protein Foulingmentioning

confidence: 99%

Section: Coatings That Prevent Protein Foulingmentioning

confidence: 99%

Antifouling Coatings: Recent Developments in the Design of Surfaces That Prevent Fouling by Proteins, Bacteria, and Marine Organisms

2010

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“…Glass beads or fiberglass mesh structures may increase the surface area available for catalysis. Taoda [142] developed photocatalytic silica gel by coating a transparent film of TiO 2 on beads of silica gel. Because the reaction area was large, it allowed highly efficient decomposition of harmful organic substances, unpleasant odors and colored matters present in wastewater.…”

Section: Wastewater Treatmentmentioning

confidence: 99%

A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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“…Transition metal oxide semiconductors, such as titania [1,2], are promising materials for wide ranging applications as photo-electro-catalysts [3][4][5], energy conversion materials [6], environmental clean-up agents [7,8], food additives [9] components of biomaterials [10] and advanced products of pharmaceutical [11], cosmetic [12] or medical relevance [13,14]. However, incorporation of oxide nanoparticles into such materials may lead to their subsequent uncontrollable release into the environment, in particular into the marine and freshwater systems, and subsequent undesired transfer into the trophic chains.…”

Section: Introductionmentioning

confidence: 99%

Photogeneration of reactive oxygen species over ultrafine TiO2 particles functionalized with rutin–ligand induced sensitization and crystallization effects

et al. 2019

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Interaction of amorphous and crystalline TiO 2 ultrafine particles (2-6 nm) with rutin results in the formation of colored nanomaterials of an excellent dispersity and enhanced colloidal stability in aqueous media. The FTIR and Raman spectra confirmed attachment of the rutin ligand via vicinal hydroxyl groups in a catechol-like fashion. The binding of rutin to amorphous TiO 2 gives rise to spontaneous crystallization of the parent nanoparticles into hydrogen titanates (H 2 Ti 3 O 7 and H 2 Ti 12 O 25). Such structural transformations result in photosensitization toward visible light with enhanced efficiency of the charge separation and interfacial charge transfer processes, confirmed by detailed photoelectrochemical studies of the examined nanomaterials. The effectiveness of the photocatalytic ROS generation reactions was also strongly influenced by hydrogen peroxide, which plays a double role of a reactant prone to reduction and generation of hydroxyl radicals or a redox agent destroying the intra-band gap electronic states, suppressing thereby charge recombination. The photoinduced charge transfer processes lead to generation of various reactive oxygen species, which were detected by EPR using DMPO spin trap (HOO • detection) and in the reaction with terephthalic acid acting as a chemical scavenger (HO • detection). Complexation of TiO 2 particles with rutin shifts the photogeneration of hydroperoxyl (HOO •) and hydroxyl (HO •) radicals toward visible light (λ > 400 nm). A triple effect of rutin attachment to titania was established. It consists in pronounced photosensitization, promotion of crystallization and enhancement of the colloidal stability of ultrafine titania particles. Environmental implications of these assets on the photoinduced redox reactions with hydrogen peroxide in aqueous solutions upon UV or visible light irradiation were also discussed.

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Development of TiO2 photocatalysts suitable for practical use and their applications in environmental cleanup

Cited by 33 publications

References 1 publication

Antifouling Coatings: Recent Developments in the Design of Surfaces That Prevent Fouling by Proteins, Bacteria, and Marine Organisms

Antifouling Coatings: Recent Developments in the Design of Surfaces That Prevent Fouling by Proteins, Bacteria, and Marine Organisms

A review of TiO2 nanoparticles

Photogeneration of reactive oxygen species over ultrafine TiO2 particles functionalized with rutin–ligand induced sensitization and crystallization effects

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