Inactivation of Escherichia coli by photocatalytic oxidation

Bekbölet, Miray; Araz, Claudia V.

doi:10.1016/0045-6535(95)00359-2

Cited by 88 publications

(42 citation statements)

References 10 publications

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“…[16][17][18] Sunada et al proposed that decomposition of the outer membrane by photocatalytic reaction ultimately leads to cell death. 31 Maness et al reached the more specific conclusion that photocatalysis promotes peroxidation of phospholipids in the membrane.…”

Section: Discussionmentioning

confidence: 99%

“…It has been confirmed that these active oxygen species can destroy the outer bacterial cell membrane, ultimately leading to nonselective cell death without fostering drug-resistant species, as well as decompose endotoxins and provide nourishment for bacteria. [16][17][18][19][20] In our previous in vitro studies, TiO 2 film had a strong photocatalytic bactericidal effect on Staphylococcus aureus, 21 which is one of the main bacteria causing pin site infection and can easily become antibiotic-resistant.…”

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confidence: 99%

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Clinical and histomorphometrical study on titanium dioxide-coated external fixation pins

Koseki¹,

Asahara²,

Shida³

et al. 2013

IJN

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Background:Pin site infection is the most common and significant complication of external fixation. In this work, the efficacy of pins coated with titanium dioxide (TiO 2 ) for inhibition of infection was compared with that of stainless steel control pins in an in vivo study. Methods: Pins contaminated with an identifiable Staphylococcus aureus strain were inserted into femoral bone in a rat model and exposed to ultraviolet A light for 30 minutes. On day 14, the animals were sacrificed and the bone and soft tissue around the pin were retrieved. The clinical findings and histological findings were evaluated in 60 samples. Results: Clinical signs of infection were present in 76.7% of untreated pins, but in only 36.7% of TiO 2 -coated pins. The histological bone infection score and planimetric rate of occupation for bacterial colonies and neutrophils in the TiO 2 -coated pin group were lower than those in the control group. The bone-implant contact ratio of the TiO 2 -coated pin group was significantly higher (71.4%) than in the control pin group (58.2%). The TiO 2 was successful in decreasing infection both clinically and histomorphometrically. Conclusion:The photocatalytic bactericidal effect of TiO 2 is thought to be useful for inhibiting pin site infection after external fixation.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Clinical and histomorphometrical study on titanium dioxide-coated external fixation pins

Koseki¹,

Asahara²,

Shida³

et al. 2013

IJN

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“…Fotokataliz prosesi ile kabul edilebilir proses süresi aralığında, doğal ve yapay ışık kaynakları altında etkin olarak bakteri inaktivasyonu sağlanabildiği literatürde bir çok çalışmada ifade edilmiştir [9][10][11][12]. Fotokimyasal…”

Section: Introductionunclassified

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

Özkal¹,

Pagano²

2016

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZSu kaynaklarında sıklıkla rastlanan mikrokirleticilerin, alıcı ortamdaki çevresel etkileri ve mevcut arıtma sistemleri ile etkin giderilememeleri sebebiyle gelecek yıllarda yasal sınırlamaların hedefi olması beklenmektedir. Özellikle farmasötikler ve geniş kullanım alanına sahip antibiyotikler, hem üretimleri, hem de tüketimleri sonrasında çevreye salınmakta ve alıcı ortamı tehdit etmektedir. Biyolojik arıtma sistemleri başta olmak üzere konvansiyonel arıtma proseslerinin, antibiyotiklerin gideriminde yetersiz kaldığı görülmektedir. Antibiyotiklerin biyolojik olarak bozunmaya dirençli yapısı oksidasyon potansiyeli yüksek olan ileri oksidasyon proseslerinin kullanımını gerektirmektedir. Fotokataliz prosesleri, eko-toksik etkisinin minimum düzeyde olması ve antibiyotikleri mineralize edebilme potansiyeli ile önemli bir detoksifikasyon prosesidir. Ayrıca prosesin güneş enerjisi ile işletilebilir olması, deneysel çalışma ve pilot ölçekli uygulamalara olan ilgiyi arttırmaktadır. Bu çalışma ile literatürde askıda sistem ve yüzeyde sabitlenme prensibine göre yürütülmekte olan fotokataliz prosesi çalışmalarının temel prensip ve mekanizmaları, antibiyotik giderimi ve bakteri inaktivasyonu açısından değerlendirilmektedir. Proses parametrelerinin, büyük ölçekli uygulamaların yaygınlaşması ve prosesin modellenmesi hedeflerine uygun olarak ele alınması üzerinde durulmuştur. Anahtar Kelimeler: Antibiyotik giderimi, bakteri inaktivasyonu, fotokataliz EVALUATION OF ANTIBIOTICS AND ANTIBIOTIC RESISTANT BACTERIA REMOVAL BY PHOTO-CATALYSIS ABSTRACTMicro-pollutants are one of the most commonly encountered pollutants in water resources. Because of environmental impacts and insufficient rates of removal at the prevalent treatment plant, they involve the most specific pollutants that will be the target of future legislations. Following their production and consumption, releases of effluents pose a threat to the receiving environment. Conventional but most essentially of biological treatment plants, are mostly ineffective for removal of antibiotics. Advanced oxidation processes with their high oxidation potentials have the utmost potential for total mineralization of antibiotics that have non-biodegradable structure. Photo-catalysis is superior with its process mechanism causing relatively lower eco-toxicity and able to provide total mineralization and may be nominated as a detoxification process option. Since photo-catalysis has potential to be operated under solar irradiation, there is growing interest in both laboratory scale experiments and pilot scale applications.

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“…TiO 2 primary particle size was reported as 30 nm and dispersed particle size would be 200-215 nm in comparison to bacteria being greater than 0.45 µm [29]. As a consequence due to the low initial adsorption of TC bacteria (~25% for both L3 and H3), photocatalytic inactivation profiles of TC could be related to the Eley-Rideal mechanism rather than the surface-oriented Langmuir-Hinshelwood mechanism [30][31][32]. On the other hand, FC inactivation profiles could be correlated to higher adsorptive removals (76% for L3 and 65% for H3).…”

Section: Bacterial Inactivationmentioning

confidence: 99%

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

Uyguner-Demirel

Bekbölet

2016

Catalysts

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This study aimed to investigate TiO 2 photocatalytic degradation of synthetically-prepared greywater samples with differing compositional contents of organic matter (OM), anion concentration, and microbiological consortium. Treatment efficiency was followed through removal of organic matter content in terms of dissolved organic carbon (DOC), specific spectroscopic parameters, and bacterial inactivation. Photocatalytic degradation kinetics were expressed by pseudo first-order kinetic modeling. The best DOC removal rates were attained for greywater samples containing OM with lower molecular size fractions. In addition, either enhancing or reducing the effect of common anions as radical scavengers were observed depending on the composition and concentration of variables in the greywater matrix. Moreover, possibility of a photocatalytic disinfection process was found to be of a bacteria type specific in OM-loaded synthetic greywater samples. Photocatalytic destruction of fecal streptococci required longer irradiation periods under all conditions. Bacterial removal rates were found to be in the order of total coliform > fecal coliform > fecal streptococci, for low organic load greywater, and fecal coliform > total coliform > fecal streptococci, for high organic load greywater.

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Inactivation of Escherichia coli by photocatalytic oxidation

Cited by 88 publications

References 10 publications

Clinical and histomorphometrical study on titanium dioxide-coated external fixation pins

Clinical and histomorphometrical study on titanium dioxide-coated external fixation pins

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

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