Photocatalytic Properties of Amorphous N-doped TiO2 Photocatalyst under Visible Light Irradiation

Amorphous TiO2 doped with N was characterized by its photocatalytic activity under visible light irradiation. The amorphous N-doped TiO2 was prepared by the sol-gel method through heat treatment at a low temperature. The photocatalyst showing activity in visible light despite heat treatment at low temperature can be applied to plastics and has excellent utility. The N-doped TiO2 appeared amorphous when heat-treated at 130 °C. It was converted into an anatase-type N-doped TiO2 when this was calcined at 500 °C. The photocatalyst showed photocatalytic activities in the photocatalytic decomposition of formaldehyde and methylene blue under visible light irradiation. The photocatalyst exhibited a higher rate of hydrogen production than that of TiO2 in photocatalytic decomposition of water under liquid-phase plasma irradiation. The bandgap of the amorphous N-doped TiO2 measured by investigation of optical properties was 2.4 eV. The lower bandgap induced the photocatalytic activities under visible light irradiation.

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Photocatalytic Antibacterial Effectiveness of Cu-Doped TiO2 Thin Film Prepared via the Peroxo Sol-Gel Method

Catalysts ◽

10.3390/catal8090352 ◽

2018 ◽

Vol 8 (9) ◽

pp. 352 ◽

Cited By ~ 14

Author(s):

Benjawan Moongraksathum ◽

Jun-Ya Shang ◽

Yu-Wen Chen

Keyword(s):

Electron Microscopy ◽

Methylene Blue ◽

Visible Light ◽

Visible Light Irradiation ◽

Sol Gel ◽

Light Irradiation ◽

Gel Method ◽

Doped Tio2 ◽

X Ray ◽

Photocatalytic Activities

Cu-doped titanium dioxide thin films (Cu/TiO2) were prepared on glass substrate via peroxo sol-gel method and dip-coating process with no subsequent calcination process for the degradation of organic dye and use as an antibacterial agent. The as-prepared materials were characterised using transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). For photocatalytic degradation of methylene blue in water, the samples were subjected to Ultraviolet C (UVC) and visible light irradiation. Degraded methylene blue concentration was measured using UV-Vis spectrophotometer. The antibacterial activities of the samples were tested against the gram-negative bacteria Escherichia coli (ATCC25922). Copper species were present in the form of CuO on the surface of modified TiO2 particles, which was confirmed using TEM and XPS. The optimal observed Cu/TiO2 weight ratio of 0.5 represents the highest photocatalytic activities under both UVC and visible light irradiation. Moreover, the same composition remarkably exhibited high antibacterial effectiveness against E. coli after illumination with ultraviolet A. The presence of CuO on TiO2 significantly enhanced photocatalytic activities. Therefore, active Cu-doped TiO2 can be used as a multipurpose coating material.

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Photocatalytic conversion of CO2 into methanol: Significant enhancement of the methanol yield over Bi2S3/CdS photocatalyst

International Journal of Engineering Technology and Sciences ◽

10.15282/ijets.3.2015.1.1.1021 ◽

2015 ◽

Vol 2 (1) ◽

Author(s):

M.Rahim Uddin ◽

Maksudur R. Khan ◽

M. Wasikur Rahman ◽

Chin Kui Cheng ◽

Abu Yousuf

Keyword(s):

Carbon Dioxide ◽

Visible Light ◽

Visible Light Irradiation ◽

Sol Gel ◽

Light Irradiation ◽

Significant Enhancement ◽

Gel Method ◽

Sol Gel Method ◽

Photocatalytic Activities ◽

Carbon Dioxide Co2

The present work is a significant approach to explore the photo-conversion of carbon dioxide (CO2) into methanol on Bi2S3/Cds photocatalyst under visible light irradiation. In this perspective, Bi2S3 nanoparticles have been successfully synthesized via corresponding salt and thiourea assisted sol-gel method. An innovative hetero-system Bi2S3/CdS has been proposed to achieve methanol photo evolution and its photocatalytic activities have been investigated.

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Development of Smart Composites Based on Doped-TiO2 Nanoparticles with Visible Light Anticancer Properties

Materials ◽

10.3390/ma12162589 ◽

2019 ◽

Vol 12 (16) ◽

pp. 2589 ◽

Cited By ~ 7

Author(s):

Evdokia Galata ◽

Eleni A. Georgakopoulou ◽

Maria-Emmanouela Kassalia ◽

Nefeli Papadopoulou-Fermeli ◽

Evangelia A. Pavlatou

Keyword(s):

Visible Light ◽

Tio2 Nanoparticles ◽

Visible Light Irradiation ◽

Sol Gel ◽

Ultra Violet ◽

Light Irradiation ◽

Composite Particles ◽

Doped Tio2 ◽

X Ray ◽

Anticancer Properties

In this study, the synthesis of smart, polymerically embedded titanium dioxide (TiO2) nanoparticles aimed to exhibit photo-induced anticancer properties under visible light irradiation is investigated. The TiO2 nanoparticles were prepared by utilizing the sol gel method with different dopants, including nitrogen (N-doped), iron (Fe-doped), and nitrogen and iron (Fe,N-doped). The dopants were embedded in an interpenetrating (IP) network microgel synthesized by stimuli responsive poly (N-Isopropylacrylamide-co-polyacrylicacid)–pNipam-co-PAA forming composite particles. All the types of produced particles were characterized by X-ray powder diffraction, micro-Raman, Fourier-transform infrared, X-ray photoelectron, ultra-violet-visible spectroscopy, Field Emission Scanning Electron, Transmission Electron microscopy, and Dynamic Light Scattering techniques. The experimental findings indicate that the doped TiO2 nanoparticles were successfully embedded in the microgel. The N-doped TiO2 nano-powders and composite particles exhibit the best photocatalytic degradation of the pollutant methylene blue under visible light irradiation. Similarly, the highly malignant MDA-MB-231 breast cancer epithelial cells were susceptible to the inhibition of cell proliferation at visible light, especially in the presence of N-doped powders and composites, compared to the non-metastatic MCF-7 cells, which were not affected.

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Sol-Gel Synthesized N and MN Co-Doped Tio2 Nanomaterial for Photocatalytic Degradation of Malathion under Visible Light Irradiation

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.b3116.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 3688-3694

Keyword(s):

Visible Light ◽

Photocatalytic Degradation ◽

Visible Light Irradiation ◽

Sol Gel ◽

Light Irradiation ◽

Average Particle ◽

Doped Tio2 ◽

Sem And Tem ◽

Ft Ir ◽

Co Doped

Different weight percentages (0.25-1.00 wt%) of Nitrogen (Non-Metal) and Manganese (Metal) co-doped nano titania were synthesized by sol-gel method and characterized by XRD, UV-vis.DRS, FT-IR, XPS, SEM and TEM. The XRD results has shown that all the prepared catalysts are in anatase phase indicating that co-doping of N and Mn did not affect the crystal structure of TiO2 . From the UV-vis.DRS spectra a significant absorption shift towards visible region was noticed in N and Mn co-doped TiO2 and their presence was confirmed by XPS and FT-IR results. SEM and TEM results showed spherical nanoparticles with average particle size of 9 nm. Photocatalytic efficiency of synthesized nano materials was tested on non-biodegradable organophosphorous pesticide, Malathion under visible light irradiation. The effect of dopant concentration, pH, catalyst dosage, and initial pesticide concentration on photocatalytic degradation of malathion was studied and optimum conditions were established. Among the synthesized samples 0.50 wt% N & 1.00 wt% Mn-TiO2 exhibited best photocatalytic performance. Photoluminiscent spectroscopy (PL) was used to examine the rate of production of oxidative species, hydroxyl radicals which play key role in photocatalytic degradation.

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Photocatalytic Decomposition of Acetaldehyde under Visible Light Irradiation over La3+and N Co-doped TiO2

Chemistry Letters ◽

10.1246/cl.2003.1156 ◽

2003 ◽

Vol 32 (12) ◽

pp. 1156-1157 ◽

Cited By ~ 100

Author(s):

Yoshiaki Sakatani ◽

Jun Nunoshige ◽

Hiroyuki Ando ◽

Kensen Okusako ◽

Hironobu Koike ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Photocatalytic Decomposition ◽

Doped Tio2 ◽

Co Doped

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Effective photocatalytic decomposition of VOC under visible-light irradiation on N-doped TiO2 modified by vanadium species

Applied Catalysis A General ◽

10.1016/j.apcata.2008.02.003 ◽

2008 ◽

Vol 340 (1) ◽

pp. 98-104 ◽

Cited By ~ 43

Author(s):

Shinya Higashimoto ◽

Wataru Tanihata ◽

Yoshinori Nakagawa ◽

Masashi Azuma ◽

Hiroyoshi Ohue ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Photocatalytic Decomposition ◽

Doped Tio2 ◽

Vanadium Species

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Fe-doped TiO2/Kaolinite as an Antibacterial Photocatalyst under Visible Light Irradiation

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.16.2.10325.293-301 ◽

2021 ◽

Vol 16 (2) ◽

pp. 293-301

Author(s):

Anthoni B. Aritonang ◽

Eka Pratiwi ◽

Warsidah Warsidah ◽

S. I. Nurdiansyah ◽

R. Risko

Keyword(s):

Visible Light ◽

Band Gap ◽

Visible Light Irradiation ◽

Sol Gel ◽

Light Irradiation ◽

Wave Number ◽

Crystal Lattices ◽

Doped Tio2 ◽

Tio2 Lattice ◽

Kaolinite Surface

In this work, undoped and Fe-doped TiO2 immobilized on kaolinite surface was successfully synthesized by sol-gel method with various Fe concentrations (0.05, 0.125, and 0.25 wt%). The eﬀects of Fe doping into TiO2 lattice were thoroughly investigated by a diffuse reflectance UV-visible (DRS) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, and X-ray diffraction (XRD). The optical band gap of undoped and Fe-doped TiO2/kaolinite is red shifted with respect to the incorporation of Fe3+ into the structure of TiO2 resulted band gap. The FTIR spectra shows a shift of peak at the wave number at 586 cm−1 and 774 cm−1 which is attribute of the Fe−O vibration as an indication of the formation of Fe-TiO2 bonds. Incorporation of Fe3+ cation into the TiO2 lattice replacing the Ti4+ ions, which induced a perturbation in anatase crystal structure, causes the change in the distance spacing of the crystal lattices dhkl(101) of 8.9632 to 7.9413. The enhanced photocatalytic performance was observed for Fe-doped TiO2/kaolinite compared with TiO2/kaolinite with respect to Escherichia coli growth inhibition in solution media under visible light irradiation. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Cu-Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity

Applied Sciences ◽

10.3390/app8112067 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2067 ◽

Cited By ~ 48

Author(s):

Snehamol Mathew ◽

Priyanka Ganguly ◽

Stephen Rhatigan ◽

Vignesh Kumaravel ◽

Ciara Byrne ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Density Functional ◽

Anatase Phase ◽

Sol Gel ◽

Light Irradiation ◽

Health Concern ◽

Bacterial Inactivation ◽

Doped Tio2 ◽

X Ray

Surface contamination by microbes is a major public health concern. A damp environment is one of potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO2) can effectively curb this growing threat. Metal-doped titania in anatase phase has been proven as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu)-doped TiO2 (Cu-TiO2) was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO2 was carried out via sol-gel technique. Cu-TiO2 further calcined at various temperatures (in the range of 500–700 °C) to evaluate the thermal stability of TiO2 anatase phase. The physico-chemical properties of the samples were characterized through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV–visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO2 was maintained well, up to 650 °C, by the Cu dopant. UV–vis results suggested that the visible light absorption property of Cu-TiO2 was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasize the introduction of Cu+ and Cu2+ ions by replacing Ti4+ ions in the TiO2 lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9999%) was attained in 30 min of visible light irradiation by Cu-TiO2.

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Enhanced Photocatalytic Activities of Ta2O5 and Nitrogen Co-Doped TiO2 under Visible Light Irradiation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.544-545.59 ◽

2007 ◽

Vol 544-545 ◽

pp. 59-62

Author(s):

Yan Fang Shen ◽

Tian Ying Xiong ◽

Ke Yang

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Raw Materials ◽

High Energy ◽

Light Irradiation ◽

Doped Tio2 ◽

Photocatalytic Activities ◽

Degussa P25 ◽

Energy Ball ◽

Co Doped

Tantalum dioxide and nitrogen co-doped titanium dioxide nanopowders, denoted as (Ta2O5, N) co-doped TiO2, were fabricated by a high-energy ball miller using TiO2, Ta2O5 and urea as raw materials. Experiments on the photocatalytic activities of the (Ta2O5, N) co-doped TiO2 were carried out in the form of photodegradation of methylene blue (MB) in aqueous solution under visible light irradiation. Enhanced photocatalytic activities were observed for the (Ta2O5, N) co-doped TiO2 than commercial Degussa P25. Besides, physical, chemical and optical properties, including XRD, DRS, and XPS were detected to analyze the origins for the enhanced photocatalytic activities of the prepared samples.

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