Influence of Doping on the Antibacterial Effect of TiO2 Nanoparticles

2006 ◽  
Vol 510-511 ◽  
pp. 86-89 ◽  
Author(s):  
Guo Mei Liu ◽  
Kai Wang ◽  
Zuo Wan Zhou
Keyword(s):  
Tio2 Nanoparticles ◽  
Antibacterial Effect ◽  
Pure Tio2 ◽  
Red Shift ◽  
Charge Transfer Transition ◽  
Inhibition Concentration ◽  
Tio2 Nanopowders ◽  
Definite Temperature ◽  
And Staphylococcus Aureus ◽  
Vanadium Ions

TiO2 nanoparticles doped with V, Mn or Zn, respectively, were synthesized from pure TiO2 and dopants calcinating at definite temperature. The physical properties of prepared TiO2 nanoparticles were characterized by TEM, XRD and UV-vis spectrum. The TEM images showed that the diameters of the particles were 20~50 nm. There was no peak of doping elements in the XRD spectrum of nano-sized TiO2 doped, but the peak of a little amount of rutile was observed, which demonstrated that V, Mn and Zn might locate in the TiO2 octahedral lattice, or might be highly dispersed within crystalline of TiO2. In the meanwhile, doping of the TiO2 decreased the temperature for TiO2 transforming from anatase into rutile, and promoted the transforming. It was found that a little amount of V5+ may take the place of Ti4+ in the lattice of TiO2. The red-shift was clearly observed in the UV-vis spectrum of TiO2 nanopowders doped with V. As a result, the band gap was changed and the TiO2 nanopowders doped with V enable to absorb visible light. The red-shift could be assigned to the charge transfer transition between the 3d orbital of V5+ and the TiO2 conduction or valance band. The red-shift was not observed in the UV-vis spectrum of TiO2 nanopowders doped with Mn and with Zn, the shape of which was similar to that of pure TiO2. The results of the minimum inhibition concentration (MIC) for Escherichia coli and Staphylococcus aureus showed that vanadium ions doping intensely improved the antibacterial efficiency of nanocrystallites. This was attributed to the change of surface properties of metal ions doped semiconductor, such as O vacancies, Ti interstitial ions and vanadium ions which took the place of titanium.

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.

Biosynthesis of TiO2 nanoparticles and their superior antibacterial effect against human nosocomial bacterial pathogens

2019 ◽  
Vol 46 (2) ◽  
pp. 1077-1089 ◽  
Author(s):  
S. Priyadarshini ◽  
Azizah Mainal ◽  
Faridah Sonsudin ◽  
Rosiyah Yahya ◽  
Abdullah A. Alyousef ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Antibacterial Effect ◽  
Bacterial Pathogens

Inhibition of Food-Related Pathogenic Bacteria by god-Transformed Penicillium nalgiovense Strains

1999 ◽  
Vol 62 (8) ◽  
pp. 940-943 ◽  
Author(s):  
ROLF GEISEN
Keyword(s):  
Antibacterial Activity ◽  
Inhibitory Activity ◽  
Type Strain ◽  
Salmonella Enteritidis ◽  
Pathogenic Bacteria ◽  
Wild Type Strain ◽  
Antibacterial Effect ◽  
Wild Type ◽  
Penicillium Nalgiovense ◽  
And Staphylococcus Aureus

Two strains of Penicillium nalgiovense, which carried the god gene of Aspergillus niger and had increased glucose oxidase (GOD) activity compared with the wild-type strain, were tested for their ability to suppress the growth of certain food-related pathogenic bacteria. In contrast to the wild type, which showed no antibacterial effect when grown in mixed culture with different bacteria, the two tranformed strains were highly antagonistic. The strain that expressed higher amounts of GOD in general had higher inhibitory activity. Both strains showed antibacterial activity against Listeria monocytogenes, Salmonella Enteritidis, and Staphylococcus aureus. The inhibitory activity was dependent on the glucose concentration in the medium. S. aureus was completely inhibited at 1% glucose in the presence of the higher GOD-producing transformant. In contrast, if arabinose was used as a carbon source, no inhibition occurred. If catalase was added to the medium, the inhibitory activity of the transformants was completely inactivated, indicating that the hydrogen peroxide produced was responsible for the antibacterial activity of the transformants.

Antibacterial effect of TiO2 nanoparticles modified with APTES

2020 ◽  
Vol 134 ◽  
pp. 105862 ◽  
Author(s):  
Paulina Rokicka-Konieczna ◽  
Agnieszka Wanag ◽  
Agnieszka Sienkiewicz ◽  
Ewelina Kusiak-Nejman ◽  
Antoni W. Morawski
Keyword(s):  
Tio2 Nanoparticles ◽  
Antibacterial Effect

Influence of gadolinium precursor on the enhanced red shift of Gd/SnO2–TiO2 nanoparticles and catalytic activity

2015 ◽  
Vol 27 (3) ◽  
pp. 2994-3002 ◽  
Author(s):  
Muhammad Akhyar Farrukh ◽  
Maryam Shahid ◽  
Iqra Muneer ◽  
Shaghraf Javaid ◽  
Muhammad Khaleeq-ur-Rahman
Keyword(s):  
Catalytic Activity ◽  
Tio2 Nanoparticles ◽  
Red Shift

Preparation and Antibacterial Effect of Nanopalygorskite Supported Nano-Silver Powder

2014 ◽  
Vol 1052 ◽  
pp. 327-331 ◽  
Author(s):  
Jian Rong Wang ◽  
Ya Li Liu ◽  
Bin Liu ◽  
Yan Ping Wu
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Room Temperature ◽  
Antibacterial Effect ◽  
Silver Powder ◽  
Nano Silver ◽  
Good Antibacterial Activity ◽  
Novel Method ◽  
And Staphylococcus Aureus

A novel method was used to make palygorskite supported nano-silver powder at room temperature. XRD result showed the presence of silver in the final product. TEM investigation revealed that nano-sliver particles of 6-10 nm in diameter were successfully attached on surface of palygorskite fiber. FTIR was also used to clarify the formation mechanism of our method. The antibacterial effect of palygorskite supported nano-silver powder was investigated. Palygorskite supported nano-silver powder had good antibacterial activity on standard Escherichia coli and Staphylococcus aureus.

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.

scholarly journals Uji efek antibakteri daun mangrove Rhizophora apiculata terhadap bakteri Pseudomonas aeruginosa dan Staphylococcus aureus

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Vivi P. Santoso ◽  
Jimmy Posangi ◽  
Henoch Awaloei ◽  
Robert Bara
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Endophytic Fungi ◽  
Bacterial Growth ◽  
Antibacterial Effect ◽  
Experimental Methods ◽  
Rhizophora Apiculata ◽  
Tissue Systems ◽  
Bacterial Growth Inhibition ◽  
And Staphylococcus Aureus

Abstract: Endophytic Fungi are microorganisms that live in the plant tissue systems such as seeds, leaves, flowers, twigs, stems, and roots. Endophytic fungi used in this study was isolated from Mangrove Rhizophora apiculata leaves. R. apiculata is widely grown in coastal areas. This study aimed to determine whether there was an antibacterial effect of endophytic fungi that was isolated from leaves of Rhizophora apiculata against the sample bacteria Pseudomonas aeruginosa and Staphylococcus aureus. This study was conducted in the Pharmacology and Therapeutics Laboratory of Sam Ratulangi University by using experimental methods. The results showed two types of fungi, tusky white endophytic fungi and white filamentous endophytic fungi, isolated from Mangrove Rhizophora apiculata leaves. Both types of fungi showed the presence of bacterial growth inhibition, but the white filamentous endophytic fungi had greater antibacterial effect than the tusky white endophytic fungi.Keywords: endophytic fungi, antibacterial, rhizophora apiculata leavesAbstrak: Jamur endofit merupakan mikroorganisme yang hidup di dalam sistem jaringan tumbuhan seperti biji, daun, bunga, ranting, batang, dan akar. Jamur endofit yang digunakan pada penelitian ini merupakan hasil isolasi dari daun mangrove Rhizophora apiculata. Tanaman mangrove R.apiculata ini banyak tumbuh di kawasan pesisir pantai. Penelitian ini bertujuan untuk mengetahui apakah terdapat efek antibakteri jamur endofit yang diisolasi dari daun Rhizophora apiculata terhadap bakteri uji Pseudomonas aeruginosa dan Staphylococcus aureus. Penelitian ini dilakukan di Laboratorium Farmakologi dan Terapi Universitas Sam Ratulangi Manado dengan menggunakan metode eksperimental. Hasil penelitian ini didapatkan dua jenis jamur yaitu jamur endofit berwarna putih gading dan jamur endofit berwarna putih berserabut yang diisolasi dari daun mangrove Rhizophora apiculata. Kedua jenis jamur menunjukan adanya daya hambat pertumbuhan kedua bakteri uji, namun jamur endofit berwarna putih berserabut memiliki efek antibakteri lebih besar dari pada jamur endofit berwarna putih gading.Kata kunci: jamur endofit, antibakteri, daun rhizophora apiculata

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