Mixed phase V doped titania shows high photoactivity for disinfection of Escherichia coli and detoxification of phenol

Nair, Ranjith G.; Roy, Jetendra Kumar; Samdarshi, S.K.; Mukherjee, Ashis K.

doi:10.1016/j.solmat.2012.05.008

Cited by 24 publications

(12 citation statements)

References 33 publications

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“…Fortunately, this obstacle could be solved by the band shifting. According to the "interfacial model", 16 under irradiation of visible and near-infrared light with wavelength longer than 520 nm, only Ag 2 S QDs is activated and the Ag 2 S CB shifts upward due to the accumulation of photoexcited electrons, making it possible for the photoexcited electrons in Ag 2 S to reach the CB of CdS, and then the electrons will persistently transfer from the Ag 2 S CB to that of the CdS and TiO 2 NTs, respectively.…”

Section: Resultsmentioning

confidence: 99%

Heterojunction Engineering of CdS and Ag₂S Quantum Dots Co-Sensitized TiO₂Nanotube Array Photoelectrode

Zhong

Wang

Zhou

2014

J. Electrochem. Soc.

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CdS and Ag 2 S heteojunctions sensitized TiO 2 nanotube arrays (TiO 2 NTs/CdS-Ag 2 S) were prepared by cation exchange between Cd 2+ and Ag + on the basis of the TiO 2 NTs/CdS. The deposition of CdS and Ag 2 S heteojunctions on the upper and inner surface of the TiO 2 NTs was confirmed by field emission scanning electron (FE-SEM) and transmission electron microscopes (TEM). The UV-vis spectrum of the TiO 2 NTs/CdS-Ag 2 S revealed the photoresponse range covering the full visible and near-infrared regions, and showed considerable enhanced photoelectrochemical properties. The corresponding charge transfer path of the TiO 2 NTs/CdS-Ag 2 S photoelectrode was also illuminated.In recent years, titanium dioxide nanotube arrays (TiO 2 NTs) prepared by the electrochemical anodization method have attracted great interest due to their unique electronic and optical properties, which can be applied in photocatalyst, biosensor, photo-chromic device and other applications. 1-5 However, the intrinsic band gap of TiO 2 (3.2 eV) and high recombination rate of photogenerated electron-hole pairs are the main two drawbacks limiting the further improvement of photoelectrochemical properties. Many works related to narrow band gap semiconductors have been performed on the TiO 2 NTs to overcome these obstacles. [6][7][8] In particular, the narrow band-gap of CdS and its relatively high electron injection rate and compatibility with TiO 2 NTs make it highly desirable for application in photovoltaics and photoelectrochemistry in comparison with other semiconductors. Unfortunately, the CdS nanoparticles deposited on the TiO 2 NTs could only absorb the solar spectrum below 520 nm, which means that the utilization of solar energy is still limited. Heterostructures between CdS and other semiconductors have recently received massive attention because of utilizing visible light with longer wavelength and depressing the recombination of photogenerated electron-hole pairs for the solar cell applications. 9,10 Ag 2 S, having a large absorption coefficient and a direct band gap of 0.9 eV, is a promising material as a photosensitizer for photovoltaic cells. 11 Therefore, it is of great importance to develop a facile and rational strategy for the large scale preparation of well-defined CdS-Ag 2 S heterostructures to sensitize the TiO 2 NTs photoelectrode for enhancement of photoelectric properties.Notably, cation exchange provides a powerful route for tuning the composition and resulting optical properties of semiconductor nanocrystals. 12 Nanostructure combining CdS and Ag 2 S quantum dots (QDs) to yield a unique hybrid heterojunction could be prepared by a portion exchange of the CdS nanocrystal. In this work, we reported on the synthesis of the heterojunction of CdS and Ag 2 S to sensitize the TiO 2 NTs photoelectrode by the cation exchange method. Successful preparation of CdS and Ag 2 S heterojunction on the nanotube walls was confirmed, whereas the photochemical properties of the hybrid photoelectrode were systematically explored. The results in...

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Section: Resultsmentioning

confidence: 99%

Heterojunction Engineering of CdS and Ag₂S Quantum Dots Co-Sensitized TiO₂Nanotube Array Photoelectrode

Zhong

Wang

Zhou

2014

J. Electrochem. Soc.

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“…Among the different doped materials reported, silver, vanadium, iron, and palladium-modified nitrogen-doped TiO 2 have been tested to enhance photocatalytic performance of titania for gram-negative bacteria such as Escherichia coli, Pseudomonas aeruginosa, and Prevotella intermedia inactivation in water Wu et al 2008;Sun et al 2010;Ubonchonlakate et al 2012;Nair et al 2012) as well as some gram-positive bacteria, i.e., MRSA, Staphylococcus epidermidis, S. saprophyticus, S. pyogenes, Streptococcus aureus, and Saccharomyces cerevisiae (Mo et al 2007;Sheel et al 2008;Lu et al 2006;Erkan et al 2006), and a few protozoa such as Tetraselmis suecica, Amphidinium carterae, and Chlorella vulgaris (Rodríguez-González et al 2010;Foster et al 2011). …”

Section: Chaptermentioning

confidence: 99%

Photocatalytic Semiconductors

2015

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“…However, the photocatalytic and antibacterial activities of TiO 2 nanoparticles are still relatively small because of their large band gap (3.2 eV). ,− Doping with metals or nonmetals into the TiO 2 lattice is an effective method for improving the photocatalytic and antibacterial ability of TiO 2 under visible light irradiation by shifting the absorption peak from UV to the visible region. , However, the transition-metal-doped TiO 2 has high photocatalytic and antibacterial activity in the visible light region. Among these transition-metal dopants, vanadium is one of the most efficient dopants to enhance the photocatalytic activity under visible light irradiation as it can increase the lifetime of the charge carrier. − The incorporation of vanadium into the TiO 2 lattice can tune its band gap toward the visible region, which introduces a new energy level and increases the separation efficiency of the electron/hole pair. Because of the fast separation efficiency of the electron/hole pair under visible light irradiation, the photocatalytic and antibacterial activities of vanadium-incorporated TiO 2 enhance. , Some metal oxides cannot be incorporated effectively into the zinc coating due to their nonwetting nature in the galvanization bath .…”

Section: Introductionmentioning

confidence: 99%

“…Among these transition-metal dopants, vanadium is one of the most efficient dopants to enhance the photocatalytic activity under visible light irradiation as it can increase the lifetime of the charge carrier. − The incorporation of vanadium into the TiO 2 lattice can tune its band gap toward the visible region, which introduces a new energy level and increases the separation efficiency of the electron/hole pair. Because of the fast separation efficiency of the electron/hole pair under visible light irradiation, the photocatalytic and antibacterial activities of vanadium-incorporated TiO 2 enhance. , Some metal oxides cannot be incorporated effectively into the zinc coating due to their nonwetting nature in the galvanization bath . This is the main challenge for the development of metal oxide-incorporated hot-dip zinc coating.…”

Section: Introductionmentioning

confidence: 99%

Development of Antibacterial V/TiO₂-Based Galvanic Coatings for Combating Biocorrosion

Deepa

Arunima

Elias

et al. 2021

ACS Appl. Bio Mater.

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Recently, TiO2 crystals have been modified by transition-metal dopants with different physicochemical structures to attain distinguished properties. Considering the similar ionic sizes of V4+ (0.058 nm) and Ti4+ (0.061 nm), vanadium in the +4 state can be effectively incorporated into the crystal lattice of TiO2 to tune the band gap energy by creating an impurity energy level (V5+/V4+) below the conduction band (2.1 eV) and retaining the anatase phase. In vanadium-incorporated TiO2 (V/TiO2), V4+ is a good dopant candidate as it can increase the lifetime of the charge carrier and reduce the electron–hole recombination rate, which results in high antibacterial activity under visible light irradiation. The present study explores the V/TiO2-based hot-dip zinc coating with enhanced electrochemical properties and long-term stability for combating biocorrosion. All the composites and the coatings are characterized by different techniques, including X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, energy-dispersive X-ray analysis, confocal laser scanning microscopy, optical surface profilometry, and X-ray photoelectron spectroscopy. The biofilm formation assay and the cell viability assay reveal that the tuned composition of the V/TiO2-based hot-dip zinc coating effectively kills the adherent bacteria and inhibits biofilm formation on the surface. The high-charge-transfer resistance (225.67, 223.63, and 242.35 Ω cm2) and the high-inhibition efficiency (92.24, 92.30, and 92.02%) of the tuned composition of the V/TiO2-based hot-dip zinc coating confirm its efficient and sustainable antibiocorrosion performance and long-term stability even after an exposure period of 21 days in different bacterial environments. With the inherent antibacterial properties and antibiocorrosion performance of the developed V/TiO2-based hot-dip zinc coating, the mild steel substrates can find potential application in different fields, including aquatic and marine environments.

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Mixed phase V doped titania shows high photoactivity for disinfection of Escherichia coli and detoxification of phenol

Cited by 24 publications

References 33 publications

Heterojunction Engineering of CdS and Ag₂S Quantum Dots Co-Sensitized TiO₂Nanotube Array Photoelectrode

Heterojunction Engineering of CdS and Ag₂S Quantum Dots Co-Sensitized TiO₂Nanotube Array Photoelectrode

Photocatalytic Semiconductors

Development of Antibacterial V/TiO₂-Based Galvanic Coatings for Combating Biocorrosion

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Mixed phase V doped titania shows high photoactivity for disinfection of Escherichia coli and detoxification of phenol

Cited by 24 publications

References 33 publications

Heterojunction Engineering of CdS and Ag2S Quantum Dots Co-Sensitized TiO2Nanotube Array Photoelectrode

Heterojunction Engineering of CdS and Ag2S Quantum Dots Co-Sensitized TiO2Nanotube Array Photoelectrode

Photocatalytic Semiconductors

Development of Antibacterial V/TiO2-Based Galvanic Coatings for Combating Biocorrosion

Contact Info

Product

Resources

About

Heterojunction Engineering of CdS and Ag₂S Quantum Dots Co-Sensitized TiO₂Nanotube Array Photoelectrode

Heterojunction Engineering of CdS and Ag₂S Quantum Dots Co-Sensitized TiO₂Nanotube Array Photoelectrode

Development of Antibacterial V/TiO₂-Based Galvanic Coatings for Combating Biocorrosion