Book: Nanosized Titania Composites for Reinforcement of Photocatalysis and Photoelectrocatalysis (original) (raw)
Related papers
Photocatalytic Activity and Antibacterial Behavior of Polyaniline-Doped Titanium Oxide Layers
Dental Materials, 2022
The sol-gel process is used to prepare photocatalytic coatings with antibacterial properties. Also, doping with metallic or non-metallic elements has an impact on the antibacterial and photocatalytic activity of these coatings. Although there are many studies in this field, the effect of co-doping with Cu and N and their concentrations on the antibacterial properties of TiO 2 coatings against the E. coli and S. aureus bacteria has not been studied. In the present investigation, the sol-gel method was employed to deposit both undoped and Cu-N co-doped TiO 2 photocatalytic coatings on glass surface, which are expected to degrade bacterial and chemical contaminants in water while exposed to visible sunlight wavelengths. Before the coating process, an appropriate heat treatment was applied on the samples and the quality of coatings, band gap energy, and also photocatalytic and antibacterial properties were evaluated. Results showed that, in the presence of dopants, the band gap become narrower and the absorption spectrum is transferred from the ultraviolet to the visible light range. Also, it was demonstrated that, under the visible light radiation, all of the co-doped samples show higher photocatalytic activity than the undoped ones. Meanwhile, the antibacterial characteristics of TiO 2 coatings was enhanced by increasing the dopant concentration when exposing to sunlight.
Modified nanostructured titania photocatalysts for aquatic disinfection applications
Materials Today: Proceedings, 2021
According to the SDG 6, everyone on earth should have access to safe and affordable drinking water. In sharing water-treatment technologies that leads to accomplishing this goal, it is imperative to devise ways of removing microbial contaminants such as E. coli from drinking water especially in resource-limited settings that lack centralized water supply systems. One of the approaches is bacterial disinfection of water at the point of use. In this study, the bactericidal effects of the photocatalysis of titanium dioxide-based nanoparticles under UV and visible light are explored. Pristine and silver doped nanostructured mesoporous titanium dioxide (Ag-TiO 2 , TiO 2) particles with high specific surface area and average crystallite domain size of $ 7.0-7.5 nm were prepared using the simple and cost effective sol-gel technique followed by thermal treatment. The addition of Ag + ions during the hydrolysis/condensation of the Ti (IV) molecular precursor led to homogeneous dispersion of the Ag + cations on the titania matrix. The As-prepared nanoparticles were characterized using X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), thermogravimetry, Fourier Transform Infra-Red (FTIR), and Raman Spectroscopy. X-ray diffraction, FTIR and Raman spectroscopy confirmed that the crystalline structure of the TiO 2 matrix corresponds to the anatase polymorph; however, the presence of the dopant led to an increase in the system disorder due to the rise in concentration of oxygen vacancies. The As-prepared nanoparticles were used for Escherichia coli (E. coli) inactivation under dark and UV-Visible light conditions. Under dark conditions, Ag doped titania and pristine titania resulted in $ 95% and $ 64% E. coli population inactivity while under light conditions, 9999% and 99 97% degradation respectively were observed. Taken together, these results demonstrate that, the synthesized TiO 2 nanoparticles have promising applications in the light mediated point of use inactivation of bacterial contaminants in water.
Developments in photocatalytic antibacterial activity of nano TiO2: A review
Korean Journal of Chemical Engineering, 2016
TiO 2 , which is one of the most explored materials, has emerged as an excellent photocatalyst material for environmental and energy fields, including air and water purification, self-cleaning surfaces, antibacterial and water splitting. This review summarizes recent research developments of TiO 2-based photocatalyst used for photocatalytic antibacterial applications. Several strategies to enhance the efficiency of TiO 2 photocatalyst are discussed, including doping with metal ions, noble metals, non-metals, and coupling with other materials. The mechanism of photocatalytic antibacterial activity in the presence of nano-sized TiO 2 is also discussed. The modified TiO 2 photocatalyst significantly inhibits the growth of bacterial cells in response to visible light illumination. TiO 2 photocatalysis appears to be promising as a route of advanced oxidation process for environmental remediation.
Journal of Nanomaterials, 2015
The presence of both organic and inorganic pollutants in water due to industrial, agricultural, and domestic activities has led to the global need for the development of new, improved, and advanced but effective technologies to effectively address the challenges of water quality. It is therefore necessary to develop a technology which would completely remove contaminants from contaminated waters. TiO2(titania) nanocatalysts have a proven potential to treat “difficult-to-remove” contaminants and thus are expected to play an important role in the remediation of environmental and pollution challenges. Titania nanoparticles are intended to be both supplementary and complementary to the present water-treatment technologies through the destruction or transformation of hazardous chemical wastes to innocuous end-products, that is, CO2and H2O. This paper therefore explores and summarizes recent efforts in the area of titania nanoparticle synthesis, modifications, and application of titania n...
Photocatalytic activity of polyaniline-TiO2 nanocomposites
Indian Journal of Physics, 2011
The characteristics of the UV illumination-assisted degradation of Malachite green (MG) on highly active nanostructured-anatase TiO 2 , bulk Polyaniline (PAni), PAni nanoparticles and PAni-TiO 2 nanocomposites have been studied. Dodecylbenzene sulphonic acid doped PAni-TiO 2 nanocomposites were synthesized by a water-assisted self-assembly method. Samples were characterized using transmission electron microscopy, X-ray diffraction studies, Fourier Transform Infra red spectroscopy and photoluminescence studies. Photoluminescence intensity of TiO 2 nanoparticles was found to decrease with the increase of PAni in the nanocomposite which can be attributed to the reduction of electron-hole pair recombination at the interface of PAni and TiO 2 due to electron transfer from TiO 2 to PAni. Exposure to UV light brought about the photocatalytic oxidation of MG in contact with bulk PAni, PAni and TiO 2 nanoparticles, and PAni-TiO 2 nanocomposites. The decrease in absorbance was measured, and its kinetics was analyzed using the Langmuir-Hinshelwood kinetic model. PAni-TiO 2 nanocomposites exhibit higher photocatalytic activity than pure TiO 2 nanoparticles, bulk PAni and PAni nanoparticles under the same degradation condition for MG. The enhanced photocatalytic activity of nanocomposites is attributed to the electron transfer from TiO 2 to PAni resulting in enhancing the oxidative property of the TiO 2 nanoparticles.
Nanoscience and Nanometrology, 2021
In recent years development of different type of industries are enlarged and these industries are connected with the discarding of organic pollutants which are harmful to aquatic system and the human health. The presence of those organic pollutants in the aquatic system can result in pollution of wastewater which affects the ecosystem. Therefore, the removals of pollutants have become an ecological concern and they are vital for the environmental sustainability. Many practices have been widely applied in the treatment of organic effluent such as biological treatment, reverse osmosis, ozonation, filtration, adsorption on solid phases, incineration, and coagulation. However, each of the methodologies has its own advantages and limitations. The recent research demonstrates that advanced oxidation processes (AOPs) based on photocatalysts are valuable and this method benefits complete mineralization of organic molecules into nontoxic CO2 and H2O at the atmospheric conditions by generatin...
A Review on Green Synthesis of TiO2 NPs: Photocatalysis and Antimicrobial Applications
Polymers, 2022
Nanotechnology is a fast-expanding area with a wide range of applications in science, engineering, health, pharmacy, and other fields. Nanoparticles (NPs) are frequently prepared via a variety of physical and chemical processes. Simpler, sustainable, and cost-effective green synthesis technologies have recently been developed. The synthesis of titanium dioxide nanoparticles (TiO2 NPs) in a green/sustainable manner has gotten a lot of interest in the previous quarter. Bioactive components present in organisms such as plants and bacteria facilitate the bio-reduction and capping processes. The biogenic synthesis of TiO2 NPs, as well as the different synthesis methods and mechanistic perspectives, are discussed in this review. A range of natural reducing agents including proteins, enzymes, phytochemicals, and others, are involved in the synthesis of TiO2 NPs. The physics of antibacterial and photocatalysis applications were also thoroughly discussed. Finally, we provide an overview of c...
A brief review on applications of titanium dioxide nanoparticles and their resources
Journal of Medicinal and Nanomaterials Chemistry , 2024
The ongoing issue of environmental pollution, particularly water contamination, remains a significant challenge worldwide. Water contamination involves the introduction of harmful pollutants into water bodies, which can include heavy metals, organic dyes, pharmaceuticals, and other toxic substances. These pollutants pose severe risks to both human health and the environment, impacting aquatic life and contaminating drinking water sources. As clean water sources become increasingly scarce due to pollution, the demand for effective water purification and treatment technologies is rising. Addressing water contamination requires a multi- faceted approach, including stricter regulations, innovative treatment methods, and global cooperation to ensure safe and sustainable water supplies for future generations. Titanium dioxide nanoparticles (TiO2 NPs) have gained significant attention in recent years due to their unique properties and widespread applications, particularly in environmental pollution control. These nanoparticles can be synthesized using various physical, chemical, and environmentally friendly methods, allowing for customization based on specific needs and applications. One of the most remarkable features of TiO2-NPs is their high surface area-to-volume ratio, which enhances their reactivity and makes them highly effective in catalyzing the degradation of pollutants through photocatalysis. Given the growing environmental concerns and the need for sustainable solutions, this review delves into the latest advancements in the synthesis of TiO2 NPs and their environmental applications, with a particular focus on their role in wastewater treatment. By examining these recent developments, the review highlights the potential of TiO2 NPs in addressing some of the most pressing challenges in water contamination and pollution management.
Potential Role of ‘Green’ Synthesized Titanium Dioxide Nanoparticles in Photocatalytic Applications
Crystals
Environmental sustainability is the cornerstone of the development of nanotechnology in today’s time. The synthesis of nanoparticles (NPs) based on green chemistry widely promotes this concept by minimizing the use of toxic precursors. Herein, the synthesis of titanium dioxide (TiO2) NPs is reported using Origanum majorana extract. The mode of synthesis is facile, eco-friendly, economically, applicable, and rapid. The constituent phytochemicals of the extract responsible for the formation of the nanocatalysts were identified using FTIR spectroscopy. In addition, X-ray diffraction, particle size measurements, and transmission electron microscopy were used to characterize the nanocatalysts. Moreover, the ability of TiO2 NPs to degrade rhodamine B dye under UV irradiation was also investigated. The key findings showed the marked photocatalytic property of the synthesized green TiO2 NPs, which could be potentially incorporated as a nanoscale technique in the process of water purificatio...
2021
Titanium dioxide nanoparticles (TiO2-NPs) were synthesized via a facile hydrothermal method. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR), and Raman spectroscopy were used to study the structure, morphology, chemical composition, and functional group attached to the as-synthesized TiO2-NPs. These NPs were then used to test their efficacy against various microbes and their potency as effective catalysts. TiO2-NPs are found to have the maximum antibacterial activity against Gram-negative bacterial strains rather than Gram-positive bacteria. The photocatalytic activity of the TiO2-NPs was investigated for the photodegradation of 10 ppm bromophenol blue (BPB) dye by using 0.01 g–0.05 g of catalyst. TiO2-NPs exhibited the removal of 95% BPB, respectively, within 180 min. The TiO2-NPs’ antibacterial and catalytic properties suggest that these may be used in environmental remediation...