Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Antimicrobial properties of TiO2-SiO2 thin films
Date
2009-09-01
Author
Erdural, B. Korkmaz
Karakaş, Gürkan
Bakir, U.
SULUDERE, ZEKİYE
Suludere, D.
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
164
views
0
downloads
Cite This
Titanium dioxide (TiO2) is one of the most important and most widely used semiconductor photocatalyst due to its application in solar energy conversion and environmental purifications. In this study, SiO2 used as support material and deposition of TiO2 films on glass surfaces by using a SiO2–TiO2 binary system has been performed. The SiO2 supported TiO2 samples were synthesized by sol–gel technique by using SiO2 colloidal solution and hydrolysis of TTIP. The thin films over soda glass plates were obtained by dip coating followed by calcination at 500°C. The photocatalytic activities of the samples were measured with methylene blue stain degradation and antimicrobial effect against Escherichia coli under artificial sunlight. It was found that the antimicrobial activity is enhanced by the increasing ratio of SiO2/TiO2. By contrast, the methylene blue degradation is suppressed on the surfaces with higher SiO2/TiO2 ratio in spite of their higher surface area. These results reveal that photocatalytic degradation and antimicrobial effect have different mechanisms and surface activity depends strongly on surface structure. To observe effect of TiO2 and light on the morphological changes of E. coli SEM analysis of E. coli cells on the coated and uncoated glasses was performed by Prof. Dr Zekiye Suludere and Dr Demet Suludere at Gazi University after one hour irradiation. After irradiation for one hour, no obvious morphological changes of E. coli cells were recognized on the uncoated glass. By contrast, the shape of the cells, which looks like sausage, disappeared on the coated glass after one hour irradiation. The photocatalytic inactivation experiments with E. coli revealed that the addition of SiO2 enhanced the photocatalytic activity of thin films. However, addition of SiO2 reduced photocatalytic self-cleaning activity of thin films against MB stain. In addition, it was found that the specific surface area and super-hydrophilic property of thin films increased with addition of SiO2.
Subject Keywords
Biotechnology
,
Bioengineering
,
Molecular Biology
,
General Medicine
URI
https://hdl.handle.net/11511/36705
Journal
NEW BIOTECHNOLOGY
DOI
https://doi.org/10.1016/j.nbt.2009.06.303
Collections
Department of Chemical Engineering, Article
Suggestions
OpenMETU
Core
The effects of microbial lignocellulose pretreatments on xylooligosaccharide production
Uckun, E.; Ak, O.; Bakir, U. (Elsevier BV, 2009-09-01)
Lignocellulosic agricultural waste materials are produced in huge amounts in the world and regarded as abundant, inexpensive readily available natural sources for various industries. They are mainly composed of three types of macromolecules, cellulose, hemicellulose and lignin. Cellulose and hemicellulose are converted to a variety of valuable compounds such as enzymes, hormones, antibiotics, ethanol, sugar alcohols, organic acids and xylooligosaccharides (XOs) using bioprocessing methods easily after the r...
A promising enzyme anchoring probe for selective ethanol sensing in beverages
Soylemez, Saniye; Goker, Seza; Toppare, Levent Kamil (Elsevier BV, 2019-07-15)
A newly designed amperometric biosensor for the determination of ethanol through one-step electrochemical coating of (4,7-di(thiophen-2-yl)benzo[c][1,2,5]selenadiazole-co-1H-pyrrole-3-carboxylic acid) (TBeSe-co-P3CA) on a graphite electrode is presented. It was aimed to propose a newly synthesized copolymer with enhanced biosensing properties as a novel sensor for the quantification of ethanol. The conjugated copolymer (TBeSe-co-P3CA) was prepared through electrochemical polymerization by potential cycling....
Development of a paper-type tyrosinase biosensor for detection of phenolic compounds
Senyurt, Ozge; EYİDOĞAN, FÜSUN; Yilmaz, Remziye; Oz, M. Tufan; Ozalp, V. Cengiz; Arica, Yakup; Öktem, Hüseyin Avni (Wiley, 2015-01-01)
A low-cost, portable, and disposable paper-type tyrosinase biosensor was developed for determination of phenolic compounds, using a paper-strip absorption method. Tyrosinase and a chromophore (3-methyl-2-benzothiazolinone hydrazone) were immobilized on paper strips to manufacture the biosensor, which was tested on a nontoxic substrate (l-dopamine). The biosensor was responsive to phenolic compounds such as 4-chlorophenol, catechol, m-cresol, and p-cresol. The sensor showed stability for 70days. The develope...
Encapsulated green magnetic nanoparticles for the removal of toxic Pb2+ and Cd2+ from water: Development, characterization and application
Ali, Imran; Peng, Changsheng; Lin, Dichu; Saroj, Devendra P.; Naz, Iffat; Khan, Zahid M.; Sultan, Muhammad; Ali, Mohsin (Elsevier BV, 2019-03-15)
Current research is based on an innovative approach of the fabrication of encapsulated sustainable, green, phytogenic magnetic nanoparticles (PMNPs), to inhibit the generation of secondary pollutants (Iron/Fe degrees) during water treatment applications. These novel bio-magnetic membrane capsules (BMMCs) were prepared using twostep titration gel crosslink method, with polyvinyl alcohol and sodium alginate matrix as the model encapsulating materials to eliminate potentially toxic metals (Pb2+ and Cd2+) from ...
Selective oxidation and reduction reactions with cofactor regeneration mediated by galactitol-, lactate-, and formate dehydrogenases immobilized on magnetic nanoparticles
Demir, Ayhan Sıtkı; Talpur, Farah N.; Sopaci, S. Betul; Kohring, Gert-W; ÇELİK, AYHAN (Elsevier BV, 2011-04-10)
Rapid immobilization with the one-pot purification of galactitol dehydrogenase (GatDH) and formate dehydrogenase (FDH) is achieved by using iminodiacetic acid (IDA) with chelated Co2+ modified magnetic nanoparticles as a carrier. Lactate dehydrogenase (LDH) from recombinant Escherichia coli and FDH commencing Candida methylica were used as an auxiliary enzyme for the regeneration of NADH/NAD(+) with a representative synthesis of (S)-1,2-propanediol and L-tagatose starting from hydroxyacetone and galactitol....
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
B. K. Erdural, G. Karakaş, U. Bakir, Z. SULUDERE, and D. Suludere, “Antimicrobial properties of TiO2-SiO2 thin films,”
NEW BIOTECHNOLOGY
, pp. 0–0, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36705.