Direct transformation of metallic copper to copper nanostructures by simple alcohol thermal treatment and their photoactivity

Evolution scheme for the morphology of Cu sheets with ATT for different times (left). Inactivation of E. coli by untreated Cu sheet and Cu nanobelts, nanowires and nanoparticles in the dark and under light irradiation (right).

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Fabrication of AgCl/Ag3PO4/graphitic carbon nitride heterojunctions for enhanced visible light photocatalytic decomposition of methylene blue, methylparaben and E. coli

RSC Advances ◽

10.1039/d0ra09147b ◽

2021 ◽

Vol 11 (11) ◽

pp. 6383-6394 ◽

Cited By ~ 1

Author(s):

Haishuai Li ◽

Linlin Cai ◽

Xin Wang ◽

Huixian Shi

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Photocatalytic Degradation ◽

Visible Light Irradiation ◽

Carbon Nitride ◽

Light Irradiation ◽

Graphitic Carbon Nitride ◽

Photocatalytic Decomposition ◽

E Coli ◽

Visible Light Photocatalytic

A noval ternary nanocomposite AgCl/Ag3PO4/g-C3N4 was successfully synthesized for photocatalytic degradation of methylene blue, methylparaben and inactivation of E. coli under visible light irradiation, showing excellent photocatalytic degradation performance and stability.

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TiO2 antifouling coating based on epoxy-modified tung oil waterborne resin

Polymers and Polymer Composites ◽

10.1177/09673911211011123 ◽

2021 ◽

pp. 096739112110111

Author(s):

Hailiang Hu ◽

Minmin Chen ◽

Mengye Cao

Keyword(s):

Escherichia Coli ◽

Staphylococcus Aureus ◽

Antimicrobial Activity ◽

Survival Rate ◽

Light Irradiation ◽

Fouling Resistance ◽

Tung Oil ◽

E Coli ◽

Antifouling Coating ◽

Waterborne Epoxy

The eco-friendly functionalized TiO2/polymer antifouling (AF) coating was successfully synthesized by dispersing TiO2 nanoparticles in waterborne epoxy-modified tung oil resin. The AF effectiveness of coating was evaluated toward Staphylococcus aureus ( S. aureus, ATCC6538), Escherichia coli ( E. coli, ATCC8739) and diatom ( Cyclotella sp., FACHB-1635). The nanoTiO2/polymer AF coating showed good antimicrobial activity both under the light and dark conditions by comparison with the pristine TiO2 nanoparticles and bulk polymer. Under light irradiation for 50 min, the AF coating showed only 8.4% and 8% survival rate for S. aureus and E. coli. In addition, The AF coatings exhibited favorable inhibition efficacy toward the growth and adhesion of Cyclotella sp., and the efficacy was enhanced with the increase of TiO2 content. It can be concluded that TiO2 nanoparticles endow the AF coatings with promoted fouling resistance properties.

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Preparation of azo-dye sensitized TiO 2 photocatalyst for inhibition of E-Coli bacteria under visible light irradiation

Materials Today Proceedings ◽

10.1016/j.matpr.2017.09.081 ◽

2017 ◽

Vol 4 (11) ◽

pp. 11671-11678

Author(s):

M. Giridhar ◽

H.S. BhojyaNaik ◽

R. Vishwanath ◽

C.N. Sudhamani ◽

M.C. Prabakar ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Azo Dye ◽

Light Irradiation ◽

E Coli ◽

Dye Sensitized

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Optoregulated Drug Release from an Engineered Living Hydrogel

10.26434/chemrxiv.7087010 ◽

2018 ◽

Author(s):

Shrikrishnan Sankaran ◽

Judith Becker ◽

Christoph Wittmann ◽

Aránzazu del Campo

Keyword(s):

Drug Release ◽

Blue Light ◽

Light Irradiation ◽

E Coli ◽

Hydrogel Matrix ◽

Prolonged Drug Release

A living hydrogel has been developed with metabolically and optogenetically engineered E. coli encapsulated within an agarose-based hydrogel matrix to produce and release deoxyviolacein in response to blue light irradiation. Localized, tunable and prolonged drug release have been demonstrated.<br>

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Sterilization of E. Coli by Fe-Doped TiO2 Modified Photocatalytic Paint under Visible Light Irradiation

High-Performance Ceramics V - Key Engineering Materials ◽

10.4028/0-87849-473-1.1493 ◽

2008 ◽

pp. 1493-1496

Author(s):

Rong Liang He ◽

Yi Wei ◽

Wen Bin Cao

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

E Coli

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The Influence of the Degradation of Tetracycline by Free Radicals from Riboflavin-5′-Phosphate Photolysis on Microbial Viability

Microorganisms ◽

10.3390/microorganisms7110500 ◽

2019 ◽

Vol 7 (11) ◽

pp. 500 ◽

Cited By ~ 1

Author(s):

Shiuh-Tsuen Huang ◽

Shwu-Yuan Lee ◽

Song-Hua Wang ◽

Chun-Yi Wu ◽

Jeu-Ming P. Yuann ◽

...

Keyword(s):

Blue Light ◽

Treatment Method ◽

Light Irradiation ◽

Flavin Mononucleotide ◽

Molecular Formula ◽

Bacterial Survival ◽

Exact Mass ◽

E Coli ◽

Environmentally Sound ◽

Antibiotic Degradation

Tetracycline (TC) is a broad-spectrum antibiotic compound. Wastewater with TC may have an adverse effect on ecosystems. Riboflavin-5′-phosphate (FMN or flavin mononucleotide) is a non-toxic product of the phosphorylation of vitamin B2 and is required for the proper functioning of the humans. FMN is sensitized to ultraviolet (UV) and blue light radiation, as evidenced by the generation of reactive oxygen species (ROS). This study inspects feasible applications of blue light on FMN so as to develop a valid way of degrading TC by FMN photolysis. We used the increased rate of bacterial survival as a practical indicator of antibiotic degradation. TC in the presence of FMN solution decomposed completely after 20 W/m2 of blue light irradiation (TCF treatment), and the degradation of TC (D-TCF) occurred after the photolytic process. After TCF treatment, colony-forming units (CFUs) of Escherichia coli (E. coli) were determined for the D-TCF solution. The CFU of E. coli preservation was 93.2% of the D-TCF solution (50 μg/mL of TC in the presence of 114 μg/mL of FMN solution treated with 20 W/m2 of blue light irradiation at 25 °C for 1 h) cultivation. The mass spectrum of D-TCF showed diagnostic ion signals at m/z 431.0 and 414.0 Da. The molecular formula of D-TCF was C21H22N2O8, and the exact mass was 430.44 g/mol. TC degradation by FMN photolysis can significantly decrease the antimicrobial ability of TC. The results expressed here regarding the influence of FMN photolysis on TC degradation offer an environmentally sound wastewater treatment method.

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Synthesis of Carbon Doped TiO2 Quantum Dots for Photocatalytic Sterilization under the Visible Light Irradiation and the Mechanisms

E3S Web of Conferences ◽

10.1051/e3sconf/201911801013 ◽

2019 ◽

Vol 118 ◽

pp. 01013 ◽

Cited By ~ 1

Author(s):

Wei Xiong ◽

Altair T.F. Cheung ◽

Michael K.H. Leung

Keyword(s):

Quantum Dots ◽

Visible Light ◽

Visible Light Irradiation ◽

Superoxide Radical ◽

Light Irradiation ◽

Doping Amount ◽

E Coli ◽

Carbon Doped ◽

Chemical States ◽

Self Protection

In this article, the carbon doped TiO2 (C-TiO2) quantum dots (QDs) were prepared through the hydrothermal method and calcination. The size of the C-TiO2 QDs is about 5.7 nm. The doping amount of carbon can be tuned by adjusting the volumes of the carbon source, ethylene glycol added. The carbon atoms are proved to be doped into the interstitial sites of TiO2 lattice and induce the change of chemical states of Ti 2p and C 1s. The doping of carbon leads to the increasing photocatalytic sterilization of E. coli under the visible light irradiation. The survival rate of E. coli cells over C-TiO2 is only 1.5 % after 6 h. The reactive oxygen species (ROS), such as hydroxyl radical and superoxide radical, are considered as the primary factors for the photocatalytic sterilization. Due to oxidative stress of the attack by ROS, the enzyme activity per cells increases for self-protection during the photocatalytic sterilization.

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Effect of surface pretreatment of TiO 2 films on interfacial processes leading to bacterial inactivation in the dark and under light irradiation

Interface Focus ◽

10.1098/rsfs.2014.0046 ◽

2015 ◽

Vol 5 (1) ◽

pp. 20140046 ◽

Cited By ~ 23

Author(s):

Sami Rtimi ◽

Jelena Nesic ◽

Cesar Pulgarin ◽

Rosendo Sanjines ◽

Michael Bensimon ◽

...

Keyword(s):

Diffuse Reflectance Spectroscopy ◽

Bond Distance ◽

Light Irradiation ◽

Outer Cell ◽

Bacterial Inactivation ◽

Surface Pretreatment ◽

X Ray ◽

E Coli ◽

Transmission Electron ◽

Plasma Pretreatment

Evidence is presented for radio-frequency plasma pretreatment enhancing the amount and adhesion of TiO 2 sputtered on polyester (PES) and on polyethylene (PE) films. Pretreatment is necessary to attain a suitable TiO 2 loading leading to an acceptable Escherichia coli reduction kinetics in the dark or under light irradiation for PES–TiO 2 and PE–TiO 2 samples. The amount of TiO 2 on the films was monitored by diffuse reflectance spectroscopy and X-ray fluorescence. X-ray electron spectroscopy shows the lack of accumulation of bacterial residues such as C, N and S during bacterial inactivation since they seem to be rapidly destroyed by TiO 2 photocatalysis. Evidence was found for Ti 4+ /Ti 3+ redox catalysis occurring on PES–TiO 2 and PE–TiO 2 during the bacterial inactivation process. On PE–TiO 2 surfaces, Fourier transform infrared spectroscopy (ATR-FTIR) provides evidence for a systematic shift of the n a (CH 2 ) stretching vibrations preceding bacterial inactivation within 60 min. The discontinuous IR-peak shifts reflect the increase in the C–H inter-bond distance leading to bond scission. The mechanism leading to E. coli loss of viability on PES–TiO 2 was investigated in the dark up to complete bacterial inactivation by monitoring the damage in the bacterial outer cell by transmission electron microscopy. After 30 min, the critical step during the E. coli inactivation commences for dark disinfection on 0.1–5% wt PES–TiO 2 samples. The interactions between the TiO 2 aggregates and the outer lipopolysaccharide cell wall involve electrostatic effects competing with the van der Waals forces.

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