Exploring potential Environmental applications of TiO2 Nanoparticles
TL;DR: In this paper, thin layers of (TiO2) with a high photocatalytic activity and antibacterial properties were prepared by sol-gel process using Titanium Tetrachloride (TiCl4) as a precursor, and calcined at different calcination temperatures (400, 600, 800, and 1000) °C.
About: This article is published in Energy Procedia.The article was published on 2017-07-01 and is currently open access. It has received 195 citations till now. The article focuses on the topics: Titanium dioxide & Spin coating.
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TL;DR: In this article, the authors explain some applications and theoretical concepts of nanostructure of TiO2 nanoparticles and demonstrate electrical, optical and morphological properties of nanoparticles for environmental applications.
267 citations
TL;DR: In this paper, the authors summarized the significant properties of black TiO2 and identified some of the conflicting points observed in literature where further light needs to be shed for better understanding, including role of defects in overall photoactivity, photoactivity under visible spectrum, existence/coexistence of Ti3+ species and oxygen vacancies and their location, connection between band gap values and photocatalytic activity etc.
155 citations
12 Feb 2021
TL;DR: In this paper, the authors have surveyed antibacterial and antiviral materials of various classes such as small-molecule organics, synthetic and biodegradable polymers, silver, TiO2, and copper-derived chemicals.
Abstract: The ongoing worldwide pandemic due to COVID-19 has created awareness toward ensuring best practices to avoid the spread of microorganisms. In this regard, the research on creating a surface which destroys or inhibits the adherence of microbial/viral entities has gained renewed interest. Although many research reports are available on the antibacterial materials or coatings, there is a relatively small amount of data available on the use of antiviral materials. However, with more research geared toward this area, new information is being added to the literature every day. The combination of antibacterial and antiviral chemical entities represents a potentially path-breaking intervention to mitigate the spread of disease-causing agents. In this review, we have surveyed antibacterial and antiviral materials of various classes such as small-molecule organics, synthetic and biodegradable polymers, silver, TiO2, and copper-derived chemicals. The surface protection mechanisms of the materials against the pathogen colonies are discussed in detail, which highlights the key differences that could determine the parameters that would govern the future development of advanced antibacterial and antiviral materials and surfaces.
117 citations
TL;DR: In this paper, an efficient photocatalytic titanium dioxide nanoparticles@nitrogen-doped carbon (TiO2 NPs@C) nanocomposite and bright fluorescent with good biocompatible nitrogen doped carbon dots (N-CDs) were synthesized at once by an affordable hydrothermal method.
110 citations
TL;DR: In this article, the most recent advancement in heat transfer fluids, their preparation and stability issues when doped with nanoparticles are discussed and compared and their preparation methods and properties are discussed.
109 citations
References
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TL;DR: In this paper, the impact of particle size on phase stability and phase transformation during growth of nanocrystalline aggregates was investigated using titania (TiO2) samples consisting of anatase and brookite.
Abstract: To understand the impact of particle size on phase stability and phase transformation during growth of nanocrystalline aggregates we conducted experiments using titania (TiO2) samples consisting of nanocrystalline anatase (46.7 wt %, 5.1 nm) and brookite (53.3 wt %, 8.1 nm). Reactions were studied isochronally at reaction times of 2 h in the temperature range 598−1023 K and isothermally at 723, 853, and 973 K by X-ray diffraction (XRD). A numerical deconvolution method was developed to separate overlapping XRD peaks, and an analytical method for determining phase contents of anatase, brookite, and rutile from XRD data was established. Results show that, in contrast to previous studies, anatase in our samples transforms to brookite and/or rutile before brookite transforms to rutile. Thermodynamic and kinetic analyses further support this conclusion. For general titania samples, the transformation sequence among anatase and brookite depends on the initial particle sizes of anatase and brookite, since partic...
1,408 citations
TL;DR: In this article, a review summarises the key topics in the field of self-cleaning coatings, concentrating on the materials that have been used in commercial applications and recent research that aims to improve these materials.
Abstract: This review summarises the key topics in the field of self-cleaning coatings, concentrating on the materials that have been used in commercial applications and recent research that aims to improve these materials. Hydrophobic and hydrophilic coatings are discussed, and the various mechanisms of self-cleaning are described and related to the material properties of the coatings. Although several multinational companies have released products incorporating self-cleaning coatings, there remains much potential in this field.
861 citations
TL;DR: Cell wall damage followed by cytoplasmic membrane damage leading to a direct intracellular attack has been proposed as the sequence of events when microorganisms undergo TiO 2 photocatalytic attack.
Abstract: When exposed to near-UV light, titanium dioxide (TiO 2 ) exhibits a strong bactericidal activity. However, the killing mechanism(s) underlying the TiO 2 photocatalytic reaction is not yet well understood. The aim of the present study is to investigate the cellular damage sites and their contribution to cell death. A sensitive approach using o -nitrophenol β- d– galactopyranosideside (ONPG) as the probe and Escherichia coli as model cells has been developed. This approach is used to illustrate damages to both the cell envelope and intracellular components caused by TiO 2 photocatalytic reaction. Treatment of E. coli with TiO 2 and near-UV light resulted in an immediate increase in permeability to small molecules such as ONPG, and the leakage of large molecules such as β- d– galactosidase after 20 min. Kinetic data showed that cell wall damage took place in less than 20 min, followed by a progressive damage of cytoplasmic membrane and intracellular components. The results from the ONPG assay correlated well with the loss of cell viability. Cell wall damage followed by cytoplasmic membrane damage leading to a direct intracellular attack has therefore been proposed as the sequence of events when microorganisms undergo TiO 2 photocatalytic attack. It has been found that smaller TiO 2 particles cause quicker intracellular damage. Evidence has been obtained that indicated that the TiO 2 photocatalytic reaction results in continued bactericidal activity after the UV illumination terminates.
567 citations
TL;DR: Transparent anatase mesoporous (MTiO2) and TiO2 nanometer thin films were prepared on soda-lime glass and fused quartz via the reverse micellar method and sol-gel method, respectively as mentioned in this paper.
Abstract: Transparent anatase mesoporous TiO2 (MTiO2) and TiO2 nanometer thin films were prepared on soda-lime glass and fused quartz via the reverse micellar method and sol–gel method, respectively. The as-prepared MTiO2 and TiO2 films were then treated by dipping them in a H2SO4 solution. The MTiO2 and TiO2 films before and after surface acid treatment were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), transmission electron microscopy (TEM), X-ray diffraction (XRD), BET surface area and UV–VIS spectrophotometry. The photocatalytic activity of the samples was evaluated by photocatalytic oxidation of acetone in air. It was found that MTiO2 thin films showed higher photocatalytic activity than that of the TiO2 thin films. This was attributed to the fact that MTiO2 thin films were composed of smaller monodisperse spherical particles about 15 nm and had higher specific surface areas. Furthermore, the monodispersity of TiO2 particles was beneficial to transfer and separation of photo-generated electrons and holes in the inner of and on the surface of TiO2 particle and reduced the recombination of photo-generated electrons and holes. The films deposited on quartz showed the highest photocatalytic activity because films deposited on quartz exhibited a better crystallization and had no sodium contaminant. The photocatalytic activity of MTiO2 and TiO2 thin films deposited on different substrates after treated with H2SO4 solution was significantly enhanced. Acid treatment was particularly effective for MTiO2/glass and TiO2/glass, which showed activity enhancement of four and over two times, respectively. This increase in activity has been correlated with the reduction of sodium ions and the increase in the adsorbed hydroxyl content on the surface of TiO2 films.
471 citations