A Multifunctional Biocide/Sporocide and Photocatalyst Based on Titanium Dioxide (TiO<sub>2</sub>) Codoped with Silver, Carbon, and Sulfur

Hamal, Dambar B.; Haggstrom, Johanna A.; Marchin, George L.; Ikenberry, Myles; Hohn, Keith L.; Klabunde, Kenneth J.

doi:10.1021/la902844r

Cited by 110 publications

(53 citation statements)

References 45 publications

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“…Several groups have conducted studies on the application of impurity-doped visible light-responsive TiO 2 photocatalysts in bacterial inactivation (Cheng et al 2009(Cheng et al , 2012Hamal et al 2010;Hu et al 2006;Pan et al 2010;Wong et al 2006;Wu et al 2010a, b;Yu et al 2005). Studies have also investigated possible photocatalytic bactericidal effects against the model bacteria E. coli using silver-modified TiO 2 (Pan et al 2010;Wu et al 2010b), Ag/N-codoped TiO 2 (Wu et al 2010a), Ag/C/S-codoped TiO 2 (Hamal et al 2010), AgI/TiO 2 (Hu et al 2007), and Ag/AgBr/TiO 2 visible light-responsive photocatalysts (Hu et al 2006).…”

Section: Visible Light-responsive Tio 2 Photocatalystsmentioning

confidence: 99%

“…Studies have also investigated possible photocatalytic bactericidal effects against the model bacteria E. coli using silver-modified TiO 2 (Pan et al 2010;Wu et al 2010b), Ag/N-codoped TiO 2 (Wu et al 2010a), Ag/C/S-codoped TiO 2 (Hamal et al 2010), AgI/TiO 2 (Hu et al 2007), and Ag/AgBr/TiO 2 visible light-responsive photocatalysts (Hu et al 2006). Wong et al (2006) reported using an N-doped visible light-responsive TiO 2 photocatalyst to reduce the numbers of several human pathogens including Shigella flexneri, Listeria monocytogenes, Vibrio parahaemolyticus, Staphylococcus aureus, Streptococcus pyogenes, and Acinetobacter baumannii.…”

Section: Visible Light-responsive Tio 2 Photocatalystsmentioning

confidence: 99%

“…Application of metal doping in TiO 2 photocatalysis further improved the efficiency of the UV-activated photocatalytic sporocidal effects (Vohra et al 2005). For visible light-responsive photocatalytic inactivation of bacterial endospores, Hamal et al (2010) synthesized an Ag, C, and S codoped TiO 2 substrate, excitable under visible light, which showed strong antimicrobial properties against E. coli cells and B. subtilis spores. Kau et al (2009) reported that photocatalysis by visible light-responsive TiO 2 substrates doped with N and C significantly reduced the cell numbers and spore activity of B. subtilis, B. thuringiensis, B. cereus, and B. anthracis.…”

Section: Reduction Of Bacterial Endospore Activitymentioning

confidence: 99%

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Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria

Liou

Chang

2012

Arch. Immunol. Ther. Exp.

175

123

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This review focuses on the antibacterial activities of visible light-responsive titanium dioxide (TiO(2)) photocatalysts. These photocatalysts have a range of applications including disinfection, air and water cleaning, deodorization, and pollution and environmental control. Titanium dioxide is a chemically stable and inert material, and can continuously exert antimicrobial effects when illuminated. The energy source could be solar light; therefore, TiO(2) photocatalysts are also useful in remote areas where electricity is insufficient. However, because of its large band gap for excitation, only biohazardous ultraviolet (UV) light irradiation can excite TiO(2), which limits its application in the living environment. To extend its application, impurity doping, through metal coating and controlled calcination, has successfully modified the substrates of TiO(2) to expand its absorption wavelengths to the visible light region. Previous studies have investigated the antibacterial abilities of visible light-responsive photocatalysts using the model bacteria Escherichia coli and human pathogens. The modified TiO(2) photocatalysts significantly reduced the numbers of surviving bacterial cells in response to visible light illumination. They also significantly reduced the activity of bacterial endospores; reducing their toxicity while retaining their germinating abilities. It is suggested that the photocatalytic killing mechanism initially damages the surfaces weak points of the bacterial cells, before totally breakage of the cell membranes. The internal bacterial components then leak from the cells through the damaged sites. Finally, the photocatalytic reaction oxidizes the cell debris. In summary, visible light-responsive TiO(2) photocatalysts are more convenient than the traditional UV light-responsive TiO(2) photocatalysts because they do not require harmful UV light irradiation to function. These photocatalysts, thus, provide a promising and feasible approach for disinfection of pathogenic bacteria; facilitating the prevention of infectious diseases.

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Section: Visible Light-responsive Tio 2 Photocatalystsmentioning

confidence: 99%

Section: Visible Light-responsive Tio 2 Photocatalystsmentioning

confidence: 99%

Section: Reduction Of Bacterial Endospore Activitymentioning

confidence: 99%

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Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria

Liou

Chang

2012

Arch. Immunol. Ther. Exp.

175

123

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“…Other nanomaterials have also been found to have antimicrobial properties, like TiO 2 (Hamal et al 2010), MgO (Huang et al 2005), Cu and CuO (Cárdenas et al 2009), ZnO (Bajpai et al 2010), Cd (Xie et al 2011), chitosan , and carbon nanotubes ).…”

Section: Antimicrobialsmentioning

confidence: 99%

Nano-developments for Food Packaging and Labeling Applications

Echegoyen

2015

Nanotechnologies in Food and Agriculture

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Nanotechnology is defined as the study and use of structures between 1 and 100 nm in length (at least in one dimension). Due to the different properties of nanosized materials compared to the bulk material, research in nanotechnology has increased exponentially in recent years. The food sector is no exception, and nanotechnology is present in different stages of the food chain, from agriculture to food processing, supplements, or food packaging. Among them, the most active area of food nanoscience research and development is food packaging.Nanomaterials are used in packaging to improve the packaging barrier properties, to create active or intelligent packaging materials, or to enhance the properties of edible and biodegradable packaging materials. In addition to the packages itself, nanotechnology can also be used in labeling applications, like a nano-barcode. In the present chapter, all these applications and the commercialized products already in the market will be discussed.The current legislation related to nano-developments in food packaging is at different stages in different countries, and there are concerns about the safety of the use of such nanosized materials for food packaging applications. The different studies concerning the possible migration of the nanomaterials used in the packaging to the food will be reviewed.

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“…Moreover, NDT did not significantly affect resistance of E. coli strain to tetracycline and vancomycin as irradiation time increased using an antibiotic-resistant test (KirbyBauer). Inactivation of E. coli cells and B. subtilis spores with composite nanostructured samples of Ag (0.5-20%)/(C, S)-TiO 2 has been also studied [84]. Ag/(C, S)-TiO 2 nanoparticles (crystallite size <10 nm) showed good antimicrobial properties against both E. coli (>8-log reduction) and B. subtilis spores (>5-log reduction) after 30-min exposure without light activation.…”

Section: Solar-driven Aopsmentioning

confidence: 99%

Conventional and New Processes for Urban Wastewater Disinfection: Effect on Emerging and Resistant Microorganisms

Ferro

Polo-López

Fernández‐Ibáñez

2015

The Handbook of Environmental Chemistry

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The continuous release of chemical and microbiological pollutants into the environment and the increasing demand for safe water call for effective water and wastewater treatment processes. In particular, the detection of resistant microorganisms (e.g. antibiotic-resistant bacteria) in the effluents of urban wastewater treatment plants disposed into surface water or reused (e.g. in crop irrigation) shows that conventional treatments and disinfection processes do not effectively control the spread of pathogens into the environment. There is a need for new and more effective disinfection processes and technologies. The aim of this chapter is to briefly describe some of the emerging and antimicrobial-resistant microorganisms detected in wastewater, as well as the conventional and new advanced available technologies for wastewater disinfection, and to evaluate and discuss their effect on these microorganisms. Moreover, regulations and policies on wastewater reuse are also critically discussed and compared.

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A Multifunctional Biocide/Sporocide and Photocatalyst Based on Titanium Dioxide (TiO₂) Codoped with Silver, Carbon, and Sulfur

Cited by 110 publications

References 45 publications

Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria

Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria

Nano-developments for Food Packaging and Labeling Applications

Conventional and New Processes for Urban Wastewater Disinfection: Effect on Emerging and Resistant Microorganisms

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A Multifunctional Biocide/Sporocide and Photocatalyst Based on Titanium Dioxide (TiO2) Codoped with Silver, Carbon, and Sulfur

Cited by 110 publications

References 45 publications

Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria

Bactericidal Effects and Mechanisms of Visible Light-Responsive Titanium Dioxide Photocatalysts on Pathogenic Bacteria

Nano-developments for Food Packaging and Labeling Applications

Conventional and New Processes for Urban Wastewater Disinfection: Effect on Emerging and Resistant Microorganisms

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Product

Resources

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A Multifunctional Biocide/Sporocide and Photocatalyst Based on Titanium Dioxide (TiO₂) Codoped with Silver, Carbon, and Sulfur