scholarly journals THE STRUCTURAL, MORPHOLOGICAL AND OPTICAL STUDY OF PURE AND W-DOPEDTiO2 NANO PARTICLES AND ITS APPLICATION TO ANTIMICROBIAL ACTIVITY

2017 ◽  
Vol 13 (3) ◽  
pp. 6065-6075
Author(s):  
Manikandan Kandasamy
Keyword(s):  
Antimicrobial Activity ◽  
Crystallite Size ◽  
Tio2 Nanoparticles ◽  
Research Work ◽  
Pure Tio2 ◽  
Nano Particles ◽  
Assay Method ◽  
Powdered Sample ◽  
Doped Tio2 ◽  
Vis Spectroscopy

  In this research work, the effect of Tungsten-doping on the crystal structure, morphology and antimicrobial of titanium dioxide nanoparticles were studied. The pure and different weight % of tungsten doped TiO2 nanoparticles were synthesized by sol–gel method and calcinated at 600°C for 5 hours. The synthesised products have been characterized by X-ray Diffraction studies (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Elemental analysis (EDXA), Ultra Violet Visible Spectroscopy (UV-Vis), Photoluminescence Spectra (PL), High Resolution Transmission Spectroscopy (HRTEM) and Fourier Transform Infra Red Spectroscopy (FT-IR). XRD pattern of pure TiO2 and 1 weight % W-doped TiO2nanoparticles confirms the anatase structure and increase in the W-doping changes the phase of TiO2 to rutile. Average crystallite size of synthesized nanoparticles was determined using the Debye–Scherrer formula. The crystallite size obtained for pure TiO2 is in the range from 29 nm to 39 nm and W-doped TiO2 is varied from 28 to 34 nm. The SEM images show the agglomerated particles of spherical-like morphology. Optical property and direct bandgap of pure and W-doped TiO2nanoparticles also further characterised by UV–Vis Spectroscopy. The images of HRTEM clearly confirm that particles present in the W-doped TiO2 powdered sample is nanosized particles. The Kirby Bauer Agar Well Diffusion Assay  method was employed to explore antimicrobial activity of nanosized pure and W-doped TiO2 colloidal suspension against the test microorganisms two Gram positive bacteria(Staphylococcus aureus, Bacillus subtilis),two Gram negative Bacteria(Escherichia coli, Pseudomonas aeruginosa),and two fungi(Candida albicans, Aspergillus niger). It shows that the W- doped TiO2 nanoparticles inhibited the multiplication and growth of the above mentioned test bacteria and fungi. Antimicrobial activity was found against all tested microorganisms which confirmed that W-doped TiO2 nanoparticles possess high antimicrobial activity compared to pure TiO2 nanoparticles.   

scholarly journals Green Synthesis of N/Zr Co-Doped TiO2 for Photocatalytic Degradation of p-Nitrophenol in Wastewater

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 235
Author(s):  
Hayette Benkhennouche-Bouchene ◽  
Julien G. Mahy ◽  
Cédric Wolfs ◽  
Bénédicte Vertruyen ◽  
Dirk Poelman ◽  
...  
Keyword(s):  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Visible Region ◽  
Chemical Properties ◽  
Pure Tio2 ◽  
Molar Ratio ◽  
Xps Spectra ◽  
Doped Tio2 ◽  
Co Doped

TiO2 prepared by a green aqueous sol–gel peptization process is co-doped with nitrogen and zirconium to improve and extend its photoactivity to the visible region. Two nitrogen precursors are used: urea and triethylamine; zirconium (IV) tert-butoxide is added as a source of zirconia. The N/Ti molar ratio is fixed regardless of the chosen nitrogen precursor while the quantity of zirconia is set to 0.7, 1.4, 2, or 2.8 mol%. The performance and physico-chemical properties of these materials are compared with the commercial Evonik P25 photocatalyst. For all doped and co-doped samples, TiO2 nanoparticles of 4 to 8 nm of size are formed of anatase-brookite phases, with a specific surface area between 125 and 280 m2 g−1 vs. 50 m2 g−1 for the commercial P25 photocatalyst. X-ray photoelectron (XPS) measurements show that nitrogen is incorporated into the TiO2 materials through Ti-O-N bonds allowing light absorption in the visible region. The XPS spectra of the Zr-(co)doped powders show the presence of TiO2-ZrO2 mixed oxide materials. Under visible light, the best co-doped sample gives a degradation of p-nitrophenol (PNP) equal to 70% instead of 25% with pure TiO2 and 10% with P25 under the same conditions. Similarly, the photocatalytic activity improved under UV/visible reaching 95% with the best sample compared to 50% with pure TiO2. This study suggests that N/Zr co-doped TiO2 nanoparticles can be produced in a safe and energy-efficient way while being markedly more active than state-of-the-art photocatalytic materials under visible light.

Enhancement of the Photocatalytic Performance of Ru-Doped TiO2 Nanoparticles

2008 ◽  
Vol 55-57 ◽  
pp. 853-856 ◽  
Author(s):  
Khatcharin Wetchakun ◽  
Natda Wetchakun ◽  
Sukon Phanichphant
Keyword(s):  
Electron Microscopy ◽  
Formic Acid ◽  
Tio2 Nanoparticles ◽  
Photocatalytic Performance ◽  
Condensation Reaction ◽  
Pure Tio2 ◽  
Absolute Ethanol ◽  
Impregnation Method ◽  
Doped Tio2 ◽  
Degussa P25

Pure TiO2 nanoparticles were synthesized by the modified sol-gel method using titanium tetraisopropoxide (TTIP) precursor dissolved in absolute ethanol. A pouch type cellophane membrane was employed as barrier between the precursor solution and the mixture of absolute ethanol (1:1 v/v) and distilled water with 0.5-1.0 % concentrated of ammonia in order to fix the reaction activity inside the pouch and control diffusion rate of hydrolysis and condensation reaction. The doping of TiO2 nanoparticles with 0.1, 0.2, 0.5, 1.0 and 2.0 at.% Ru was performed by the impregnation method using ruthenium acetyl acetonate in toluene as dopant. The properties of the all samples were characterized by X-ray diffraction (XRD), Brunauer, Emmett and Teller (BET)-specific surface area, Scanning electron microscopy-Energy dispersive spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The crystalline size of pure TiO2 and Ru-doped TiO2 nanopaticles were found to be in the range of 10-20 nm. The photocatalytic mineralization of formic acid, oxalic acid, sucrose and glucose was investigated using Degussa P25, pure TiO2 and Ru-doped TiO2 nanoparticles as photocatalysts in aqueous solutions under UVA irradiation. The rate of 50% mineralization of formic acid by 0.1 at.% Ru-doped TiO2 was 1.53 times and 1.34 times higher than that of pure TiO2 and Degussa P25, respectively showing the enhancement of the photocatalytic performance of TiO2 by doping with an optimum amount of ruthenium.

Synthesis, Characterization and Photocatalytic Properties of TiO2-SnO2 Composite Nanoparticles

2013 ◽  
Vol 678 ◽  
pp. 373-377 ◽  
Author(s):  
Duraisamy Nithyadevi ◽  
Ramasamy Thangavelu Rajendrakumar
Keyword(s):  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Pure Tio2 ◽  
Precursor Concentration ◽  
Pure Sno2 ◽  
Doped Tio2 ◽  
Sn Doping ◽  
Brookite Phase

Pure TiO2 nanoparticles were synthesized using Titanium (IV)-n-butoxide as Titanium precursor and Sn doping was performed by adding Tin (II) ethylhexanate (Sn precursor) in Titanium precursor by Sol-gel method. The morphology of nanoparticles was examined by XRD and SEM analysis. The XRD analysis shows the formation of mixture phases (anatase and brookite) for pure TiO2. Addition of lower Sn precursor concentration resulted in the formation of Sn doped TiO2 nanoparticles. On increasing the Sn precursor favours the growth of TiO2-SnO2 nanocomposites. It is interesting to observe the fraction of brookite phase in TiO2 decreases by increasing the Sn precursor concentration. The photocatalytic activity test for pure TiO2, pure SnO2, Sn doped TiO2 nanoparticles and TiO2-SnO2 nanocomposites were carried out for Methylene blue (MB) solution. Both Sn doped TiO2 nanoparticles and TiO2-SnO2 nanocomposites show faster photocatalytic degradation than pure TiO2 nanoparticles due to suppression of brookite phase by addition of Sn precursor.

scholarly journals Label-Free Electrochemical Sensor Based on Manganese Doped Titanium Dioxide Nanoparticles for Myoglobin Detection: Biomarker for Acute Myocardial Infarction

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4252
Author(s):  
Adel Al Fatease ◽  
Mazharul Haque ◽  
Ahmad Umar ◽  
Shafeeque G. Ansari ◽  
Yahya Alhamhoom ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Titanium Dioxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Pure Titanium ◽  
Label Free ◽  
Doped Tio2 ◽  
Vis Spectroscopy ◽  
Mn Doped

A label free electrochemical sensor based on pure titanium oxide and manganese (Mn)-doped titanium oxide (TiO2) nanoparticles are fabricated and characterized for the sensitive detection of myoglobin (Mb) levels to analyze the cardiovascular infarction. Pristine and Mn-doped TiO2 nanoparticles were synthesized via the sol-gel method and characterized in order to understand their structure, morphologies, composition and optical properties. The structural properties revealed that the pure- and doped-TiO2 nanoparticles possess different TiO2 planes. FTIR studies confirm the formation of metal oxide nanoparticles by exhibiting a well-defined peak in the range of 600–650 cm−1. The values of the optical band gap, estimated from UV-Vis spectroscopy, are decreased for the Mn-doped TiO2 nanoparticles. UV-Vis spectra in the presence of myoglobin (Mb) indicated interaction between the TiO2 nanoparticles and myoglobin. The SPE electrodes were then fabricated by printing powder film over the working electrode and tested for label-free electrochemical detection of myoglobin (Mb) in the concentration range of 0–15 nM Mb. The fabricated electrochemical sensor exhibited a high sensitivity of 100.40 μA-cm−2/nM with a lowest detection limit of 0.013 nM (0.22 ng/mL) and a response time of ≤10 ms for sample S3. An interference study with cyt-c and Human Serum Albumin (HSA) of the sensors show the selective response towards Mb in 1:1 mixture.

scholarly journals MoS2/Cu/TiO2 nanoparticles: synthesis, characterization and effect on photocatalytic decomposition of methylene blue in water under visible light

2018 ◽  
Vol 2017 (1) ◽  
pp. 184-193 ◽  
Author(s):  
Desireé M. de los Santos ◽  
Sara Chahid ◽  
Rodrigo Alcántara ◽  
Javier Navas ◽  
Teresa Aguilar ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Visible Region ◽  
Pure Tio2 ◽  
Photocatalytic Decomposition ◽  
Tio2 Sample ◽  
X Ray ◽  
Vis Spectroscopy

Abstract Photodegradation processes are of great interest in a range of applications, one of which is the photodecomposition of pollutants. For this reason, analysing nanoparticles that improve the efficiency of these processes under solar radiation are very necessary. Thus, in this study, TiO2 was doped with Mo and Cu using low-temperature hydrolysis as the method of synthesis. Pure TiO2 and x%MoS2/Cu/TiO2 nanoparticles were prepared, where x is the theoretical quantity of MoS2 added (0.0%, 1.0%, 5.5%, 10.0%), setting the nominal quantity of Cu at 0.5 wt.%. The samples obtained were characterized by X-ray diffraction, Raman spectroscopy, X-ray electron spectroscopy and UV-Vis spectroscopy in diffuse reflectance mode. The results suggest that the TiO2 structure was doped with the Mo6+ and Cu2+ ions in the position of the Ti4+. The x%MoS2/Cu/TiO2 samples presented lower band gap energy values and greater optical absorption in the visible region than the pure TiO2 sample. Lastly, the photocatalytic activity of the samples was assessed by means of the photodegradation of methylene blue under visible light. The results show that when the quantity of Mo in the co-doped samples increased (x%MoS2/Cu/TiO2) there were significant increases of up to 93% in the photocatalytic activity.

Enhanced Photocatalytic Activity of N/Li2MoO4 Co-doped TiO2 Nanoparticles under Visible Light

2021 ◽  
Author(s):  
Jutarat Kwakkaew ◽  
Matthana Khangkhamano ◽  
Rungrote Kokoo ◽  
Weerachai Sangchay
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Visible Region ◽  
Strong Light ◽  
Doped Tio2 ◽  
Vis Spectroscopy ◽  
Wide Range

TiO2-based nanomaterials have been extensively synthesized and used in a wide range of photocatalytic applications. The photocatalytic oxidation process, however, is only activated by irradiation with ultraviolet (UV) light which limits its indoor applications. Herein, to improve such limitations, N/Li2MoO4-doped TiO2 nanoparticles were prepared via sol-gel method. Li2MoO4 concentration was varied. The catalysts were characterized by XRD, XPS, FE-SEM, and UV-Vis spectroscopy. As-synthesized N/Li2MoO4-doped TiO2 catalysts exhibited their crystal sizes of as fine as 20 nm in diameter whereas that of the pure TiO2 was about 35 nm. The absorption ranges of the N/ Li2MoO4-doped catalysts were relocated from UV region toward visible light region. The catalyst with 1 mol% Li2MoO4 offered the highest degradation rate of methylene blue (MB) solution upon visible light irradiation. Its fine crystal size, narrow band gap energy (2.82 eV), high defect concentration, and strong light absorption in visible region are responsible for the enhanced photocatalytic activity of the 1 mol% Li2MoO4.

Nano Size Lanthanum Doped Semiconductors: Synthesis, Characterization and their Photocatalytic Activity

2007 ◽  
Vol 31 ◽  
pp. 212-214 ◽  
Author(s):  
S. Anandan ◽  
Y. Ikuma ◽  
T. Kudoh ◽  
Y. Ogita ◽  
V. Murugesan
Keyword(s):  
Photocatalytic Activity ◽  
High Activity ◽  
Nitrogen Adsorption ◽  
Pure Tio2 ◽  
Nano Particles ◽  
Doped Semiconductors ◽  
Doped Tio2 ◽  
Nano Size ◽  
La Doped ◽  
Highly Porous

In the present study, La-doped TiO2 and ZnO nano particles were synthesized and extensively characterized by various sophisticated techniques such as XRD, nitrogen adsorption, UV-Vis, AFM and XPS. Rough and highly porous surface of La-doped photocatalysts was observed by AFM, which is critical for enhancing the photocatalytic activity. Degradation and mineralization studies of monocrotophos (MCP) revealed that 1 wt% La-doped TiO2/ZnO exhibits high activity compared to that of pure TiO2/ZnO.

scholarly journals Boron-Doped TiO2-CNT Nanocomposites with Improved Photocatalytic Efficiency toward Photodegradation of Toluene Gas and Photo-Inactivation of Escherichia coli

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 632 ◽  
Author(s):  
Valmiki B. Koli ◽  
Shyue-Chu Ke ◽  
Ananta G. Dodamani ◽  
Shamkumar P. Deshmukh ◽  
Jung-Sik Kim
Keyword(s):  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Photo Luminescence ◽  
Pure Tio2 ◽  
Electron Hole ◽  
Doped Tio2 ◽  
E Coli ◽  
Boron Doped ◽  
Electron Hole Pair

An in-situ sol-gel method was used for the synthesis of boron-doped TiO2-CNT nanocomposites with varied boron concentrations from 1 to 4 mol%. The synthesized nanocomposites were characterized by various techniques, namely XRD, UV-DRS, TEM, PL, and XPS; all results show that 3 mol% B-TiO2-CNT nanocomposites have superior properties to pure TiO2, 3B-TiO2 nanoparticles, and other nanocomposites. TEM images clearly show the B-TiO2 nanoparticles decorated on the CNT surface. Photo-luminescence studies confirm that boron doping of up to 3 mol% in TiO2-CNT nanocomposites reduces the electron-hole pair recombination rate. The photocatalytic performance of the B-TiO2-CNT nanocomposites was tested against the photodegradation of toluene gas and the photocatalytic inactivation of E. coli in the presence of UV and visible light respectively. B-TiO2-CNT (3 mol%) nanocomposites show the highest photocatalytic activity.

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