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Journal articles on the topic 'Photocatalytic driven antibacterial effect'

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Author: Grafiati

Published: 6 September 2023

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1

Wong, Ming-Show, Man-Ting Sun, Der-Shan Sun, and Hsin-Hou Chang. "Visible-Light-Responsive Antibacterial Property of Boron-Doped Titania Films." Catalysts 10, no. 11 (November 19, 2020): 1349. http://dx.doi.org/10.3390/catal10111349.

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Pure titanium dioxide TiO2 photocatalytic substrates exhibit antibacterial activity only when they are irradiated with ultraviolet light, which comprises high-energy wavelengths that damage all life. Impurity doping of TiO2-related materials enables visible light to stimulate photocatalytic activity, which enhances opportunities for TiO2 to be used as a disinfectant in living environments. Boron-doped TiO2 displays visible-light-responsive bactericidal properties. However, because boron-derived compounds also exert notable antibacterial effects, most reports did not clearly demonstrate the extent to which the bactericidal property of boron-doped TiO2 is contributed by visible-light-stimulated photocatalysis. In addition, TiO2 thin films have considerable potential for applications in equipment that requires sterilization; however, the antibacterial properties of boron-doped TiO2 thin films have been examined by only a few studies. We found that boron-doped TiO2 thin films displayed visible-light-driven antibacterial properties. Moreover, because boron compounds may have intrinsic antibacterial properties, using control groups maintained in the dark, we clearly demonstrated that visible light stimulated the photocatalysis of boron-doped TiO2 thin films but not the residue boron compounds display antibacterial property. The bactericidal effects induced by visible light are equally potent for the elimination of the model organism Escherichia coli and human pathogens, such as Acinetobacter baumannii, Staphylococcus aureus, and Streptococcus pyogenes. The antibacterial applications of boron-doped TiO2 thin films are described, and relevant perspectives discussed.

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2

Wafi, Abdul, Erzsébet Szabó-Bárdos, Ottó Horváth, Mihály Pósfai, Éva Makó, Tatjána Juzsakova, and Orsolya Fónagy. "The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect." Nanomaterials 10, no. 11 (November 15, 2020): 2261. http://dx.doi.org/10.3390/nano10112261.

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Catalysts for visible-light-driven oxidative cleaning processes and antibacterial applications (also in the dark) were developed. In order to extend the photoactivity of titanium dioxide into the visible region, nitrogen-doped TiO2 catalysts with hollow and non-hollow structures were synthesized by co-precipitation (NT-A) and sol–gel (NT-U) methods, respectively. To increase their photocatalytic and antibacterial efficiencies, various amounts of silver were successfully loaded on the surfaces of these catalysts by using a facile photo-deposition technique. Their physical and chemical properties were evaluated by using scanning electron microscopy (SEM), transmission electron microscopy–energy dispersive X-ray spectroscopy (TEM–EDS), Brunauer–Emmett–Teller (BET) surface area, X-ray diffraction (XRD), and diffuse reflectance spectra (DRS). The photocatalytic performances of the synthesized catalysts were examined in coumarin and 1,4-hydroquinone solutions. The results showed that the hollow structure of NT-A played an important role in obtaining high specific surface area and appreciable photoactivity. In addition, Ag-loading on the surface of non-hollow structured NT-U could double the photocatalytic performance with an optimum Ag concentration of 10−6 mol g−1, while a slight but monotonous decrease was caused in this respect for the hollow surface of NTA upon increasing Ag concentration. Comparing the catalysts with different structures regarding the photocatalytic performance, silverized non-hollow NT-U proved competitive with the hollow NT-A catalyst without Ag-loading for efficient visible-light-driven photocatalytic oxidative degradations. The former one, due to the silver nanoparticles on the catalyst surface, displayed an appreciable antibacterial activity, which was comparable to that of a reference material practically applied for disinfection in polymer coatings.

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Zhu, Hongqin, Ji Tan, Jiajun Qiu, Donghui Wang, Zhe Zhao, Zihan Lu, Gaoshan Huang, Xuanyong Liu, and Yongfeng Mei. "Gold Nanoparticles Decorated Titanium Oxide Nanotubes with Enhanced Antibacterial Activity Driven by Photocatalytic Memory Effect." Coatings 12, no. 9 (September 16, 2022): 1351. http://dx.doi.org/10.3390/coatings12091351.

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Titanium and its alloys have been widely used for orthopedic and dental implants. However, implant failures often occur due to the implant-related bacterial infections. Herein, titanium oxide nanotubes (TNTs) with an average diameter of 75 nm were formed by anodizing on the surface of titanium, and subsequently gold (Au) nanoparticles were deposited on TNTs by magnetron sputtering (Au@TNTs). The antibacterial study shows that TNTs surface decorated with Au nanoparticles exhibits the preferable effect in restricting the growth of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) even under dark conditions, and the antibacterial rates reached 84% and 75%, respectively. In addition, the constructed film showed no cytotoxicity. Such a selective bactericidal effect of Au@TNTs samples might be attributed to the photocatalytic memory effect, which provides a new insight in the designing of antibacterial surfaces for biomedical application.

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4

Lee, Sher, and Chi-Jung Chang. "Recent Developments about Conductive Polymer Based Composite Photocatalysts." Polymers 11, no. 2 (January 24, 2019): 206. http://dx.doi.org/10.3390/polym11020206.

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Conductive polymers have been widely investigated in various applications. Several conductive polymers, such as polyaniline (PANI), polypyrrole (PPy), poly(3,4-ethylenedioxythiophene) (PEDOT)), and polythiophene (PTh) have been loaded with various semiconductor nanomaterials to prepare the composite photocatalysts. However, a critical review of conductive polymer-based composite photocatalysts has not been available yet. Therefore, in this review, we summarized the applications of conductive polymers in the preparation of composite photocatalysts for photocatalytic degradation of hazardous chemicals, antibacterial, and photocatalytic hydrogen production. Various materials were systematically surveyed to illustrate their preparation methods, morphologies, and photocatalytic performances. The synergic effect between conductive polymers and semiconductor nanomaterials were observed for a lot of composite photocatalysts. The band structures of the composite photocatalysts can be analyzed to explain the mechanism of their enhanced photocatalytic activity. The incorporation of conductive polymers can result in significantly improved visible-light driven photocatalytic activity by enhancing the separation of photoexcited charge carriers, extending the light absorption range, increasing the adsorption of reactants, inhibiting photo-corrosion, and reducing the formation of large aggregates. This review provides a systematic concept about how conductive polymers can improve the performance of composite photocatalysts.

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5

Maria Magdalane, C., K. Kaviyarasu, A. Raja, M. V. Arularasu, Genene T. Mola, Abdulgalim B. Isaev, Naif Abdullah Al-Dhabi, et al. "Photocatalytic decomposition effect of erbium doped cerium oxide nanostructures driven by visible light irradiation: Investigation of cytotoxicity, antibacterial growth inhibition using catalyst." Journal of Photochemistry and Photobiology B: Biology 185 (August 2018): 275–82. http://dx.doi.org/10.1016/j.jphotobiol.2018.06.011.

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6

Pranangrong, Duangdaw, Ratima Kraikruan, Tippabust Eksangsri, and Chaweewan Sapcharoenkun. "The Effect of Polymeric Surfactant on Adhesion and Uniformity of Ag-TiO<sub>2</sub> Coating on Air Filter with Self-Cleaning Capability." Materials Science Forum 1090 (May 31, 2023): 55–60. http://dx.doi.org/10.4028/p-o2ky4c.

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This research is a continuing study on F9-filter development via Ag-TiO2 coating to promote volatile organic compounds (VOCs) removal and antibacterial activity. Problems of poor adhesion and uniform distribution of coating material on the filter surface were observed, so the addition of a polymeric surfactant (PS), which behaves as both a binder and a surfactant, was applied in this study in order to solve such problems. Dip coated F9-filter samples with a selection of Ag-TiO2 suspension were characterized and tested. Environmental scanning electron microscope was used to characterize uniform coating distribution on an air filter. Self-cleaning test was performed in accordance with ISO 27448. The results showed that Ag-TiO2 with PS dip coating on air filters provide good adhesion and high uniformity. It is also found that self-cleaning capability of Ag-TiO2 with PS coated filter is increasing with increasing of Ag-TiO2 and PS concentrations. Within a scope of this work, only visible light can drive Ag-TiO2 to undertake photocatalytic activity. Hence, improvement of Ag-TiO2 coating on F9- filter is confirmed when PS is applied.

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7

Li, Biyun, Xiaoxiao Gao, Jiangang Qu, Feng Xiong, Hongyun Xuan, Yan Jin, and Huihua Yuan. "Visible-Light-Driven Antimicrobial Activity and Mechanism of Polydopamine-Reduced Graphene Oxide/BiVO4 Composite." International Journal of Molecular Sciences 23, no. 14 (July 12, 2022): 7712. http://dx.doi.org/10.3390/ijms23147712.

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In this study, a photocatalytic antibacterial composite of polydopamine-reduced graphene oxide (PDA-rGO)/BiVO4 is prepared by a hydrothermal self-polymerization reduction method. Its morphology and physicochemical properties are characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared (FT-IR), and X-ray diffraction (XRD). The results indicate that BiVO4 particles are evenly distributed on the rGO surface. Escherichia coli (E. coli) MG1655 is selected as the model bacteria, and its antibacterial performance is tested by flat colony counting and the MTT method under light irradiation. PDA-rGO/BiVO4 inhibits the growth of E. coli under both light and dark conditions, and light significantly enhances the bacteriostasis of PDA-rGO/BiVO4. A combination of BiVO4 with PDA-rGO is confirmed by the above characterization methods as improving the photothermal performance under visible light irradiation. The composite possesses enhanced photocatalytic antibacterial activity. Additionally, the photocatalytic antibacterial mechanism is investigated via the morphology changes in the SEM images of MG1655 bacteria, 2′,7′-dichlorofluorescein diacetate (DCFH-DA), the fluorescence detection of the reactive oxygen species (ROS), and gene expression. These results show that PDA-rGO/BiVO4 can produce more ROS and lead to bacterial death. Subsequently, the q-PCR results show that the transmembrane transport of bacteria is blocked and the respiratory chain is inhibited. This study may provide an important strategy for expanding the application of BiVO4 in biomedicine and studying the photocatalytic antibacterial mechanism.

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8

Kumar, Kundan, Anshu Priya, Aditya Arun, Subrata Hait, and Anirban Chowdhury. "Antibacterial and natural room-light driven photocatalytic activities of CuO nanorods." Materials Chemistry and Physics 226 (March 2019): 106–12. http://dx.doi.org/10.1016/j.matchemphys.2019.01.020.

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9

Li, Yeping, Qian Wang, Liying Huang, Xiuquan Xu, Meng Xie, Hao Wang, Shuquan Huang, Fei Zhang, Zhengyun Zhao, and Juan Yang. "Enhanced LED-light-driven photocatalytic antibacterial by g-C3N4/BiOI composites." Journal of Materials Science: Materials in Electronics 30, no. 3 (December 17, 2018): 2783–94. http://dx.doi.org/10.1007/s10854-018-0554-3.

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10

Lefatshe, Kebadiretse, Lemme P. Kebaabetswe, and Cosmas M. Muiva. "Visible-Light Driven Photocatalytic and Antibacterial Assessment of Ag/ZnO/Cellulose Nanocomposite." Advanced Science, Engineering and Medicine 12, no. 6 (June 1, 2020): 844–52. http://dx.doi.org/10.1166/asem.2020.2658.

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Ag/ZnO/cellulose nanocomposites were synthesised through in-situ solution casting method, which offers a good adhesion and dispersity of nanostructured materials. SEM analysis revealed formation of nanodiscs-like structures for ZnO while nanospheres and hierarchical nanosheets were observed for Ag and cellulose, respectively. XRD analysis pointed to the monoclinic type-1 phase of cellulose. Peaks corresponding to typical hexagonal wurtzite structure of ZnO and face-centredcubic Ag structure were also identified. Photodecomposition of aqueous methylene blue (MB) under direct sunlight irradiation was monitored to study the photocatalytic activity of the nanocomposite. About 92% of MB dye was photodegraded in the presence of Ag/ZnO/cellulose nanocomposite. The influence of Ag+ ions on the photocatalytic efficiency of ZnO is discussed. The antibacterial efficiency of the synthesised samples was investigated against two Gram positive pathogenic bacteria species: Staphylococcus aureus and a spore forming Bacillus subtilis as well as a Gram-negative Escherichia coli. The prepared nanocomposite exhibited strong activity against the growth of all the bacterial species though in different quantified measures.

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11

Chen, Chuansheng, Shiyi Cao, Weiwei Yu, Xiaodi Xie, Qicheng Liu, Yuenhong Tsang, and Yi Xiao. "Adsorption, photocatalytic and sunlight-driven antibacterial activity of Bi2WO6/graphene oxide nanoflakes." Vacuum 116 (June 2015): 48–53. http://dx.doi.org/10.1016/j.vacuum.2015.02.031.

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12

Chelliah, Parvathiraja, Jeetendra Kumar Gupta, Saikh Mohammad Wabaidur, Masoom Raza Siddiqui, Siaw Foon Lee, and Wen-Cheng Lai. "UV-Light-Driven Photocatalytic Dye Degradation and Antibacterial Potentials of Biosynthesized SiO2 Nanoparticles." Water 15, no. 16 (August 18, 2023): 2973. http://dx.doi.org/10.3390/w15162973.

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The present work shows the obtainment of biosynthesized SiO2 with the aid of Jasminum grandiflorum plant extract and the study of its photocatalytic ability in dye degradation and antibacterial activity. The obtained biosynthesized SiO2 nanoparticles were characterized using X-ray diffractometer analysis, Fourier transform infrared spectroscopy analysis, ultraviolet–visible diffuse reflectance spectroscopy, field-emission scanning electron microscope with energy-dispersive X-ray analysis, transmission electron microscopy and X-ray photoelectron spectroscopy. The UV-light irradiated photocatalytic activity of the biosynthesized SiO2 nanoparticles was examined using methylene blue dye solution. Its reusability efficiency was determined over 20 cycles and compared with the commercial P-25 titanium dioxide. The bacterial resistivity of the biosynthesized SiO2 nanoparticles was examined using S. aureus and E. coli. The biosynthesized SiO2 nanoparticles showed a high level of crystallinity with no impurities, and they had an optimum crystallite size of 23 nm, a bandgap of 4 eV, no Si-OH groups and quasi-spherical shapes with Si-2p at 104 eV and O-1s at 533 eV. Their photocatalytic activity on methylene blue dye solution could reach 90% degradation after 40 min of UV light exposure, and their reusability efficiency was only 4% less than that of commercial P-25 titanium dioxide. At the concentration of 100 μg/mL, the biosynthesized SiO2 nanoparticles could allow the resistivity of E. coli to become borderline to the resistant range of an antibiotic called Amikacin.

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13

Kokilavani, S., Saleh A. Al-Farraj, Ajith M. Thomas, Hamed A. El-Serehy, Lija L. Raju, and S. Sudheer Khan. "Enhanced visible light driven photocatalytic and antibacterial activities of Ag2WO4 decorated ZnS nanocomposite." Ceramics International 47, no. 9 (May 2021): 12997–3006. http://dx.doi.org/10.1016/j.ceramint.2021.01.163.

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14

Choi, Jung-Yoon, Chooryung Judi Chung, Keun-Taek Oh, Yoon-Jeong Choi, and Kyung-Ho Kim. "Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans." Angle Orthodontist 79, no. 3 (May 1, 2009): 528–32. http://dx.doi.org/10.2319/012108-169.1.

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Abstract Objective: To test through various oxidation procedures the differences in antibacterial activities against Streptococcus mutans (S mutans) of Titanium (Ti) and Titanium silver (TiAg) metals coated with TiO2. Materials and Methods: This study examined the photocatalytic antibacterial effects on S mutans of Ti and TiAg ubstrates coated with two crystalline forms of TiO2 by thermal and anodic oxidation. A bacterial suspension of S mutans was pipetted onto TiO2-coated metal specimens and uncoated specimens with ultraviolet A (UVA) illumination for 20 to 100 minutes. The same specimen without UVA was used as the control. The level of colony-forming units of S mutans after UVA illumination was compared with that of the control. Results: The level of colony-forming units of S mutans was significantly lower on TiO2-coated Ti and TiAg metal specimens after UVA illumination than on uncoated Ti and TiAg specimens. The level of colony-forming units of S mutans was significantly lower on the metals coated by anodic oxidation than on those coated by thermal oxidation. The TiO2 coating on TiAg had a significantly higher and more rapid antibacterial effect than did the TiO2 coating on Ti. Conclusions: The antibacterial effect of a TiO2 film formed by anodic oxidation was superior to that formed by thermal oxidation. The addition of Ag to the Ti specimen indicated a synergistic effect on the photocatalytic antibacterial property against S mutans.

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15

Syed, Asad, Lakshmi Sagar Reddy Yadav, Ali H. Bahkali, Abdallah M. Elgorban, Deshmukh Abdul Hakeem, and Nagaraju Ganganagappa. "Effect of CeO2-ZnO Nanocomposite for Photocatalytic and Antibacterial Activities." Crystals 10, no. 9 (September 16, 2020): 817. http://dx.doi.org/10.3390/cryst10090817.

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The impact of a CeO2-ZnO nanocomposite on the photocatalytic and antibacterial properties compared to bare ZnO was investigated. A CeO2-ZnO nanocomposite was synthesized using Acacia nilotica fruit extract as a novel fuel by a simple solution combustion method. The obtained CeO2-ZnO nanocomposite was confirmed structurally by XRD, FTIR, Raman and UV-DRS and morphologically by SEM/TEM analysis. The XRD pattern indicates the presence of both hexagonal Wurtzite-structured ZnO (major) and cubic-phase CeO2 (minor). FTIR shows the presence of a Ce-O-Ce vibration at 468 cm−1 and Zn-O vibration at 445 cm−1. The existence of a band at 460 cm−1 confirmed the F2g Raman-active mode of the fluorite cubic crystalline structure for CeO2. Diffused reflectance spectroscopy was used to estimate the bandgap (Eg) from Kubelka–Munk (K–M) theory which was found to be 3.4 eV. TEM analysis shows almost spherical-shaped particles, at a size of about 10–15 nm. The CeO2-ZnO nanocomposite shows a good BET specific surface area of 30 m2g−1. The surface defects and porosity of the CeO2-ZnO nanocomposite caused methylene blue (MB) dye to degrade under sunlight (88%) and UV light (92%). The CeO2-ZnO nanocomposite also exhibited considerable antibacterial activity against a pathogenic bacterial strain.

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Ghoderao, Karuna P., Shweta N. Jamble, and Rohidas B. Kale. "Hydrothermally synthesized Cd-doped ZnO nanostructures with efficient sunlight-driven photocatalytic and antibacterial activity." Journal of Materials Science: Materials in Electronics 30, no. 12 (May 13, 2019): 11208–19. http://dx.doi.org/10.1007/s10854-019-01466-y.

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17

Xiang, Zhenbo, Yi Wang, Zhiqing Yang, and Dun Zhang. "Heterojunctions of β-AgVO3/BiVO4 composites for enhanced visible-light-driven photocatalytic antibacterial activity." Journal of Alloys and Compounds 776 (March 2019): 266–75. http://dx.doi.org/10.1016/j.jallcom.2018.10.287.

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18

Regiel-Futyra, Anna, Małgorzata Kus-Liśkiewicz, Szymon Wojtyła, Grażyna Stochel, and Wojciech Macyk. "The quenching effect of chitosan crosslinking on ZnO nanoparticles photocatalytic activity." RSC Advances 5, no. 97 (2015): 80089–97. http://dx.doi.org/10.1039/c5ra12667c.

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19

Choi, Jung-Yoon, Chooryung Judi Chung, Keun-Taek Oh, Yoon-Jeong Choi, and Kyung-Ho Kim. "Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans." Angle Orthodontist 79, no. 3 (2009): 528. http://dx.doi.org/10.2319/0003-3219(2009)079[0528:paeotf]2.0.co;2.

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20

Feng, Yibo, Hua Wang, Guanhua Lin, Peixin Cui, Hui Li, Zhiming Sun, Kaiwen Wang, et al. "Single Tungsten Atom-Modified Cotton Fabrics for Visible-Light-Driven Photocatalytic Degradation and Antibacterial Activity." ACS Applied Bio Materials 4, no. 5 (April 21, 2021): 4345–53. http://dx.doi.org/10.1021/acsabm.1c00124.

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21

Deng, Fang, Ping Wu, Guowen Qian, Yang Shuai, Lemin Zhang, Shuping Peng, Cijun Shuai, and Guoyong Wang. "Silver-decorated black phosphorus: a synergistic antibacterial strategy." Nanotechnology 33, no. 24 (March 25, 2022): 245708. http://dx.doi.org/10.1088/1361-6528/ac5aee.

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Abstract Black phosphorus (BP) exhibits great potential as antibacterial materials due to its unique photocatalytic activity. However, the unsatisfactory optical absorption and quick recombination of photoinduced electron–hole pairs restrain its photocatalytic antibacterial performance. In this work, silver nanoparticles (AgNPs) were decorated on BP to construct BP@AgNPs nanohybrids and then introduced into poly-l-lactic acid scaffold. Combining the tunable bandgap of BP and the LSPR effect of AgNPs, BP@AgNPs nanohybrids displayed the broaden visible light absorption. Furthermore, AgNPs acted as electron acceptors could accelerate charge transfer and suppress electron–hole recombination. Therefore, BP@AgNPs nanohybrids achieved synergistically enhanced photocatalytic antibacterial activity under visible light irradiation. Fluorescence probe experiment verified that BP@AgNPs promoted the generation of reactive oxygen species, which could disrupt bacteria membrane, damage DNA and oxide proteins, and finally lead to bacteria apoptosis. As a result, the scaffold possessed strong antibacterial efficiency with a bactericidal rate of 97% under light irradiation. Moreover, the scaffold also exhibited good cytocompatibility. This work highlighted a new strategy to develop photocatalytic antibacterial scaffold for bone implant application.

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22

DOINA, TOMA, LAURA CHIRILA, POPESCU ALINA, CHIRILA CORINA, and Iordache OVIDIU. "Multifunctional finishing treatments applied on textiles for protection of emergency personnel." Industria Textila 69, no. 05 (November 1, 2018): 357–62. http://dx.doi.org/10.35530/it.069.05.1585.

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The paper presents the results of the researches carried out for obtaining multifunctional textile materials with multiple effects, by means of superior finishing techniques, using functional chemicals in the form of aqueous dispersions. It has been studied the possibility of combining treatment with dispersions with photocatalytic and antibacterial effects with a hydrophobic/oleophobic treatment that simultaneously provides both sustainable photocatalytic and antibacterial effect as well as hydrophobic/oleophobic effect within satisfactory limits for all these effects. The results of the laboratory evaluations performed on 50% cotton and 50% functionalised HT polyamide textile fabrics showed that hydrophobization treatment with fluoropolymer dispersions can be combined with the treatment with titanium dioxide photocalatytic dispersions or silver chloride and titanium dioxide dispersions to obtain multiple photocatalytic, antibacterial and hydrophobic/ oleophobic effects without diminishing the functionalization effects that would have been achieved by individual treatments

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23

Soto-Garcia, Luis F., Ingrid D. Guerrero-Rodriguez, Luu Hoang, Samantha Lauren Laboy-Segarra, Ngan T. K. Phan, Enrique Villafuerte, Juhyun Lee, and Kytai T. Nguyen. "Photocatalytic and Photothermal Antimicrobial Mussel-Inspired Nanocomposites for Biomedical Applications." International Journal of Molecular Sciences 24, no. 17 (August 26, 2023): 13272. http://dx.doi.org/10.3390/ijms241713272.

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Bacterial infection has traditionally been treated with antibiotics, but their overuse is leading to the development of antibiotic resistance. This may be mitigated by alternative approaches to prevent or treat bacterial infections without utilization of antibiotics. Among the alternatives is the use of photo-responsive antimicrobial nanoparticles and/or nanocomposites, which present unique properties activated by light. In this study, we explored the combined use of titanium oxide and polydopamine to create nanoparticles with photocatalytic and photothermal antibacterial properties triggered by visible or near-infrared light. Furthermore, as a proof-of-concept, these photo-responsive nanoparticles were combined with mussel-inspired catechol-modified hyaluronic acid hydrogels to form novel light-driven antibacterial nanocomposites. The materials were challenged with models of Gram-negative and Gram-positive bacteria. For visible light, the average percentage killed (PK) was 94.6 for E. coli and 92.3 for S. aureus. For near-infrared light, PK for E. coli reported 52.8 and 99.2 for S. aureus. These results confirm the exciting potential of these nanocomposites to prevent the development of antibiotic resistance and also to open the door for further studies to optimize their composition in order to increase their bactericidal efficacy for biomedical applications.

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Raj, R. Bhaviya, M. Umadevi, V. Poornima Parvathi, and R. Parimaladevi. "Effect of potassium on structural, photocatalytic and antibacterial activities of ZnO nanoparticles." Advances in Natural Sciences: Nanoscience and Nanotechnology 7, no. 4 (October 14, 2016): 045008. http://dx.doi.org/10.1088/2043-6262/7/4/045008.

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25

Suketa, Naoki, Takashi Sawase, Hideki Kitaura, Mariko Naito, Koumei Baba, Koji Nakayama, Ann Wennerberg, and Mitsuru Atsuta. "An Antibacterial Surface on Dental Implants, Based on the Photocatalytic Bactericidal Effect." Clinical Implant Dentistry and Related Research 7, no. 2 (April 2005): 105–11. http://dx.doi.org/10.1111/j.1708-8208.2005.tb00053.x.

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26

Sayadi, Mohammad Hossein, Najmeh Ahmadpour, and Shahin Homaeigohar. "Photocatalytic and Antibacterial Properties of Ag-CuFe2O4@WO3 Magnetic Nanocomposite." Nanomaterials 11, no. 2 (January 24, 2021): 298. http://dx.doi.org/10.3390/nano11020298.

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This study aimed to synthesize a new magnetic photocatalytic nanosystem composed of Ag-CuFe2O4@WO3 and to investigate its photodegradation efficiency for two drug pollutants of Gemfibrozil (GEM) and Tamoxifen (TAM) under Ultraviolet (UV) light irradiation. In this regard, the effect of pH, catalyst dosage, and drug concentration was thoroughly determined. The largest photodegradation level for GEM (81%) and TAM (83%) was achieved at pH 5, a photocatalyst dosage of 0.2 g/L, drug concentration of 5 mg/L, and contact time of 150 min. The drug photodegradation process followed the pseudo first-order kinetic model. In addition to the photodegradation effect, the nanocomposites were proved to be efficient in terms of antibacterial activity, proportional to the Ag doping level. The Ag-CuFe2O4@WO3 nanocomposite exhibited a stable, efficient performance without an obvious catalytic loss after five successive cycles. Taken together, the developed magnetic photocatalyst is able to simultaneously disinfect wastewater streams and to degrade pharmaceutical contaminants and thus shows a promising potential for purification of multi-contaminant water systems.

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Liu, Ning, Jie Zhang, Yanhua Wang, Qingjun Zhu, Xuan Zhang, Jizhou Duan, and Baorong Hou. "Novel MOF-Based Photocatalyst AgBr/AgCl@ZIF-8 with Enhanced Photocatalytic Degradation and Antibacterial Properties." Nanomaterials 12, no. 11 (June 6, 2022): 1946. http://dx.doi.org/10.3390/nano12111946.

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A novel visible light-driven AgBr/AgCl@ZIF-8 catalyst was synthesized by a simple and rapid method. The composition and structure of the photocatalyst were characterized by XRD, SEM, UV-DRS, and XPS. It could be observed that the 2-methylimidazole zinc salt (ZIF-8) exhibited the rhombic dodecahedron morphology with the AgCl and AgBr particles evenly distributed around it. The composite photocatalyst AgBr/AgCl@ZIF-8 showed good photocatalytic degradation and antibacterial properties. The degradation rate of RhB solution was 98%, with 60 min of irradiation of visible light, and almost all P. aeruginosaudomonas aeruginosa (P.aeruginosa), Staphylococcus aureus (S. aureus), and Escherichia coli (E. coli) were inactivated under the irradiation of 90 min. In addition, the prepared catalyst had excellent stability and reusability. Based on the free radical capture experiment, ·O2- and h+ were believed to be the main active substances, and possible photocatalytic degradation and sterilization mechanisms of AgBr/AgCl@ZIF-8 were proposed.

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Felice, Betiana, Vera Seitz, Maximilian Bach, Christin Rapp, and Erich Wintermantel. "Antimicrobial polymers: Antibacterial efficacy of silicone rubber–titanium dioxide composites." Journal of Composite Materials 51, no. 16 (September 14, 2016): 2253–62. http://dx.doi.org/10.1177/0021998316668984.

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Control and reduction of microorganism infections in high-risk environments is up to date a challenge. Traditional techniques imply several limitations including development of antibiotics resistance and ecotoxicity. Then, polymers functionalized with photocatalyts arise as a promising solution against a broad spectrum of microorganisms found at, e.g. sanitary, food, and medical environments. Here, we present silicone rubber–TiO2 composites as novel antibacterial polymers. Four different types of composites with different TiO2 contents were produced and analyzed under UV irradiation and dark conditions in terms of particle distribution, chemical composition, photocatalytic activity, wettability, and antibacterial efficacy against Escherichia coli. Under UV irradiation, antibacterial sensitivity assay showed a 1000 times reduction of colony forming units after 2 h of light exposure so that the antibacterial ability of silicone–TiO2 composites was proved. Photocatalytic activity assessment suggested that reactive oxygen species induced by photocatalytic reaction at TiO2 particles are the main cause of the observed antibacterial effect. Scanning electron microscopy indicated no topographical damage after UV exposure. In addition, chemical analysis through Raman and X-Ray photoelectron spectroscopies demonstrated the stability of the silicone matrix under UV irradiation. Hence, the current work presents silicone–TiO2 composites as stable nonspecific antibacterial polymers for prevention of infections at multiple high-risk environments.

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Arfa, Ume, Mubark Alshareef, Nimra Nadeem, Amjed Javid, Yasir Nawab, Khaled F. Alshammari, and Usman Zubair. "Sunlight-Driven Photocatalytic Active Fabrics through Immobilization of Functionalized Doped Titania Nanoparticles." Polymers 15, no. 13 (June 22, 2023): 2775. http://dx.doi.org/10.3390/polym15132775.

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Frequent washing of textiles poses a serious hazard to the ecosystem, owing to the discharge of harmful effluents and the release of microfibers. On one side, the harmful effluents from detergents are endangering marine biota, while on the other end, microplastics are observed even in breastfeeding milk. This work proposes the development of sunlight-driven cleaning and antibacterial comfort fabrics by immobilizing functionalized Zn-doped TiO2 nanoparticles. The research was implemented to limit the use of various detergents and chemicals for stain removal. A facile sol–gel method has opted for the fabrication of pristine and Zn-doped TiO2 nanoparticles at three different mole percentages of Zn. The nanoparticles were successfully functionalized and immobilized on cotton fabric using silane coupling agents via pad–dry–cure treatment. As-obtained fabrics were characterized by their surface morphologies, availability of chemical functionalities, and crystallinity. The sunlight-assisted degradation potential of as-functionalized fabrics was evaluated against selected pollutants (eight commercial dyes). The 95–98% degradation of dyes from the functionalized fabric surface was achieved within 3 h of sunlight exposure, estimated by color strength analysis with an equivalent exposition of bactericidal activities. The treated fabrics also preserved their comfort and mechanical properties. The radical trapping experiment was performed to confirm the key radicals responsible for dye degradation, and h+ ions were found to be the most influencing species. The reaction pathway followed the first order kinetic model with rate constant values of 0.0087 min−1 and 0.0131 min−1 for MB and MO dyes, respectively.

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Erdural, Beril, Ufuk Bolukbasi, and Gurkan Karakas. "Photocatalytic antibacterial activity of TiO2–SiO2 thin films: The effect of composition on cell adhesion and antibacterial activity." Journal of Photochemistry and Photobiology A: Chemistry 283 (June 2014): 29–37. http://dx.doi.org/10.1016/j.jphotochem.2014.03.016.

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Hu, Chen Yang, Xiao Bo Zhang, Xiao Yun Li, and Hui Chen. "Catalytic Membrane and their Photocatalytic Properties." Applied Mechanics and Materials 204-208 (October 2012): 4215–18. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4215.

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A solution method was developed to synthesized heteronanostructure of Ag nanoparticles on titanate nanowires, and then flexible photocatalytic Films were made by these nanowires. The nanowire is about 50 nm in diameter, several hundreds micrometers in length. The size of the Ag nanoparticle grafted on the nanowire is about 50 to 100 nm. The nanowire Film showed excellent photocatalytic activity to decompose the methamidophos and satisfactory antibacterial effect to kill Escherichia coli.

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Kokilavani, S., Asad Syed, Lija L. Raju, Sarah Al-Rashed, Abdallah M. Elgorban, Ajith M. Thomas, and S. Sudheer Khan. "Synthesis of novel heterostructured FeS2/Ag2MoO4 nanocomposite: Characterization, efficient antibacterial and enhanced visible light driven photocatalytic activity." Surfaces and Interfaces 23 (April 2021): 101003. http://dx.doi.org/10.1016/j.surfin.2021.101003.

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33

Murugesan, Pramila, Sheeba Narayanan, and Manickam Matheswaran. "Photocatalytic performance and antibacterial activity of visible light driven silver iodide anchored on Graphitic-C3N4 binary composite." Environmental Nanotechnology, Monitoring & Management 10 (December 2018): 253–63. http://dx.doi.org/10.1016/j.enmm.2018.07.011.

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34

Zhang, Hui, Jiangying Zhu, Yanqiang Hu, Aonan Chen, Liang Zhou, Hui Gao, Yamei Liu, and Shengquan Liu. "Study on Photocatalytic Antibacterial and Sustained-Release Properties of Cellulose/TiO2/β-CD Composite Hydrogel." Journal of Nanomaterials 2019 (July 24, 2019): 1–12. http://dx.doi.org/10.1155/2019/2326042.

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A novel cellulose/TiO2/β-CD hydrogel with high photocatalytic antibacterial activity and sustained release of drug was prepared. TiO2 sol with a diameter of about 9 nm in this hydrogel was the photoantibacterial agent. β-CD can significantly enhance photoantibacterial activity and the sustained-release effect of this hydrogel. The structure and property of this hydrogel composite were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Escherichia coli and Staphylococcus aureus were selected as model bacteria to evaluate the antibacterial activity of the composite hydrogel under natural light irradiation and darkness, respectively. The in vitro release experiment used curcumin as a model drug in PBS buffer solution. The influence of β-CD on the antibacterial activity and sustained-release effect of the composite hydrogel was investigated. The results showed that the hydrogel composite presented a good photoantibacterial property, while the antibacterial activity can be neglected under the condition of no light. The complete release of curcumin from the composite was achieved after 120 h. Therefore, the hydrogel system has the characteristics of low cost and high effect, which could be used for an antibacterial sustained-release material.

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35

Vershney, Ritu, Komal Chelaramani, Arpan Bhardwaj, Nayma Siddiqui, and Suresh Kumar Verma. "Synthesis Photocatalytic and Antibacterial Activities of Nickle Doped Tio2 Nanoparticles." Oriental Journal of Chemistry 34, no. 6 (December 12, 2018): 3140–44. http://dx.doi.org/10.13005/ojc/340661.

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The synthesis of Ni doped titania (TiO2) nanoparticles were achieved via simple novel sol gel technique, in which Titanium-n-butoxide and NiCl2 were taken as precursors. Effect of different wt% of dopant in TiO2 was studied on photocatalytic degradation of Aniline blue and Toluidine Blue. The study suggested the increased photocatalytic degradation with increased time duration. The synthesized samples were analyzed by surface electron microscopy (SEM) and X-ray diffraction studies. The antibacterial activity was investigated against Gram-positive Staphylococcus aureus bacteriae. Studies revealed that on increasing the dopant concentration, the diameter of zone of inhibition also increased upto 1.5 wt%.

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36

Mariappan, A., P. Pandi, K. R. Beula Rani, Rajeswarapalanichamy, and K. Neyvasagam. "Study of the photocatalytic and antibacterial effect of Zn and Cu doped hydroxyapatite." Inorganic Chemistry Communications 136 (February 2022): 109128. http://dx.doi.org/10.1016/j.inoche.2021.109128.

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Harikishore, M., M. Sandhyarani, K. Venkateswarlu, T. A. Nellaippan, and N. Rameshbabu. "Effect of Ag Doping on Antibacterial and Photocatalytic Activity of Nanocrystalline TiO 2." Procedia Materials Science 6 (2014): 557–66. http://dx.doi.org/10.1016/j.mspro.2014.07.071.

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Shiraishi, Koutaro, Hironobu Koseki, Toshiyuki Tsurumoto, Koumei Baba, Mariko Naito, Koji Nakayama, and Hiroyuki Shindo. "Antibacterial metal implant with a TiO2 -conferred photocatalytic bactericidal effect against Staphylococcus aureus." Surface and Interface Analysis 41, no. 1 (November 21, 2008): 17–22. http://dx.doi.org/10.1002/sia.2965.

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39

Ullah, Z., M. T. Qureshi, K. Sultana, F. Ullah, A. Khalid, N. Masood, F. I. A. Abdella, and S. A. Elhag. "Al-ions effect on structural, optical, antibacterial, and photocatalytic activities of ZnO nanostructures." Digest Journal of Nanomaterials and Biostructures 18, no. 3 (July 2023): 995–1006. http://dx.doi.org/10.15251/djnb.2023.183.995.

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In this work, Pure and aluminum doped zinc oxide nanostructures were successfully synthesized through a well-established hydrothermal method. The hexagonal wurtzite structure, and nano porous shape for Al dopant in ZnO were confirmed via XRD and SEM analysis. The reduction in energy band gap (3.40 to 3.19 eV) for Al dopant samples and enhancement in inhibition zones (7 mm- 17 mm) for pure and Al-doped ZnO were recorded. The photocatalytic activity of Al doped ZnO was shown to be several times more efficient than in prior studies. The enhancement in these parameters suggest that these materials are good candidates for biomedical and optoelectronic applications.

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40

Shen, Bowen, Yuxian Wang, Xinlong Wang, Fatima Ezzahra Amal, Liying Zhu, and Ling Jiang. "A Cruciform Petal-like (ZIF-8) with Bactericidal Activity against Foodborne Gram-Positive Bacteria for Antibacterial Food Packaging." International Journal of Molecular Sciences 23, no. 14 (July 6, 2022): 7510. http://dx.doi.org/10.3390/ijms23147510.

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Most antibacterial nanomaterials used in food packaging act by releasing reactive oxygen species (ROS), which cannot efficiently have an inhibitory effect by penetrating the cell wall of Gram-positive Staphylococcus aureus. In this work, we used the cruciform petal-like zeolite imidazole framework-8 (ZIF-8) synthesized in the water phase which can release active Zn compounds in aqueous solution and exert a stronger inhibitory effect on S. aureus. The experimental results demonstrated that the aqueous cruciform petal-like ZIF-8 has the same photocatalytic activity as traditional ZIF-8 and can be applied in photocatalytic bacterial inactivation. The cruciform petal-like ZIF-8 was also shown to release active Zn compounds in aqueous solution with a better antibacterial effect against S. aureus, reaching 95% inactivation efficiency. The antibacterial effect was therefore 70% higher than that of traditional ZIF-8. Based on its excellent antibacterial properties, we loaded petal-like ZIF-8, PDA and PVA onto ordinary fibers to prepare ZIF-8-Film. The results further showed that ZIF-8-Film has a high filtration capacity, which can be used in antibacterial packaging material with the required air permeability. Moreover, ZIF-8-Flim can clean the surface on its own and can maintain a sterile environment. It is different from other disposable materials on the market in that it can be reused and has a self-disinfection function.

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Uçar, Mustafa, Atilla Evcin, and Osman Çelen. "Development and characterisation of multifunctional surface coatings for photovoltaic panels." Emerging Materials Research 11, no. 1 (March 1, 2022): 19–32. http://dx.doi.org/10.1680/jemmr.21.00041.

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In this research, the efficiency of photovoltaic (PV) panel surfaces due to environmental pollution (dust, dirt and carbon dioxide etc.) results in the loss of output power. The self-cleaning, photocatalytic, anti-reflection and antibacterial coatings developed to reduce this effect were coated on glass surfaces by the sol–gel method, and the effects of the coatings made on the efficiency of PV panels were investigated. The optical and photocatalytic properties of the coatings made were characterised by contact angle measurement and the scanning electron microscopy, respectively. The panels coated with increased light transmittance on the PV panel surface showed self-cleaning properties, an anti-reflection effect and antibacterial surface formation. Of the coatings made on the panel surfaces, photocatalytic and anti-reflection effects were provided with titanium dioxide (TiO2) and silicon dioxide (SiO2) compounds, and an antibacterial surface was obtained with the diboron trioxide (B2O3) compound. Four panels covered with titanium dioxide, silicon dioxide, diboron trioxide and TiO2 + SiO2 + B2O3 and uncoated panels were compared. The PV panels are in the external environment, and the most efficient coating determination was made with the data received from the PV system assembly to measure the extra energy produced.

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42

Li, Wan-Di, Jing Gao, and Lu Wang. "Enhancement of durable photocatalytic properties of cotton/polyester fabrics using TiO2/SiO2 via one step sonosynthesis." Journal of Industrial Textiles 46, no. 8 (February 16, 2016): 1633–55. http://dx.doi.org/10.1177/1528083716629138.

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This study aimed to increase the photocatalytic efficiency and durability of functional fabrics coated with TiO2/SiO2 nanoparticles. Tetrabutyl titanate and tetraethyl orthosilicate were used as precursor and ultrasonic irradiation was utilized as a tool for synthesis of TiO2/SiO2 in low temperature and loading nanoparticles onto the polyester-cotton fabric. The multifunctionality of such nanocomposite material was evaluated by analyzing its hydrophilicity, photocatalytic, and antibacterial activities. The hydrophilicity and photocatalytic activity were analyzed based on water droplet contact angle measurements and removal of methylene blue stain under UV, respectively. On the other hand, antibacterial activities were examined against the Gram-positive S. aureus and the Gram-negative E. Coli. TiO2/SiO2-coated fabrics exhibited outstanding self-cleaning, antibacterial, and superhydrophilic properties. Moreover, particle size analysis, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and UV–Visible spectrophotometry confirmed that TiO2/SiO2 nanoparticles produced higher photocatalytic activities on the treated fabrics than pure TiO2 nanoparticles. Furthermore, the self-cleaning properties remained after 30 launderings, indicating excellent washing durability. Therefore, this process had no significant negative effect on the wearability including tensile strength, whiteness index, ventilation property, and surface roughness of sonotreated fabrics.

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Cui, Xiaodan, Wangwang Xu, Zhiqiang Xie, James A. Dorman, Maria Teresa Gutierrez-Wing, and Ying Wang. "Effect of dopant concentration on visible light driven photocatalytic activity of Sn1−xAgxS2." Dalton Transactions 45, no. 41 (2016): 16290–97. http://dx.doi.org/10.1039/c6dt02812h.

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44

Wang, Zhiqiang, Xiuzhen Huang, Sheng Jin, Hongwei Wang, Lin Yuan, and John L. Brash. "Rapid antibacterial effect of sunlight-exposed silicon nanowire arrays modified with Au/Ag alloy nanoparticles." Journal of Materials Chemistry B 7, no. 40 (2019): 6202–9. http://dx.doi.org/10.1039/c9tb01472a.

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45

Zhang, Mingjing, Yuexing Chen, Bangjie Chen, Yunsong Zhang, Li Lin, Xiaowen Han, Ping Zou, Guangtu Wang, Jun Zeng, and Maojun Zhao. "Fabrication of a three-dimensional visible-light-driven Ag–AgBr/TiO2/graphene aerogel composite for enhanced photocatalytic destruction of organic dyes and bacteria." New Journal of Chemistry 43, no. 13 (2019): 5088–98. http://dx.doi.org/10.1039/c8nj06057f.

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46

Shen, Shaohua, Liejin Guo, Xiaobo Chen, Feng Ren, and Samuel S. Mao. "Effect of Ag2S on solar-driven photocatalytic hydrogen evolution of nanostructured CdS." International Journal of Hydrogen Energy 35, no. 13 (July 2010): 7110–15. http://dx.doi.org/10.1016/j.ijhydene.2010.02.013.

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47

Wang, Yuan, Hua-Bin Fang, Yan-Zhen Zheng, Rongqin Ye, Xia Tao, and Jian-Feng Chen. "Controllable assembly of well-defined monodisperse Au nanoparticles on hierarchical ZnO microspheres for enhanced visible-light-driven photocatalytic and antibacterial activity." Nanoscale 7, no. 45 (2015): 19118–28. http://dx.doi.org/10.1039/c5nr06359k.

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48

Shanmugam, Vignesh, and Kalyana Sundar Jeyaperumal. "Investigations of visible light driven Sn and Cu doped ZnO hybrid nanoparticles for photocatalytic performance and antibacterial activity." Applied Surface Science 449 (August 2018): 617–30. http://dx.doi.org/10.1016/j.apsusc.2017.11.167.

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49

Zgura, Irina, Nicoleta Preda, Monica Enculescu, Lucian Diamandescu, Catalin Negrila, Mihaela Bacalum, Camelia Ungureanu, and Marcela Elisabeta Barbinta-Patrascu. "Cytotoxicity, Antioxidant, Antibacterial, and Photocatalytic Activities of ZnO–CdS Powders." Materials 13, no. 1 (January 2, 2020): 182. http://dx.doi.org/10.3390/ma13010182.

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In this work, ZnO–CdS composite powders synthesized by a simple chemical precipitation method were thoroughly characterized. The morphological, structural, compositional, photocatalytical, and biological properties of the prepared composites were investigated in comparison with those of the pristine components and correlated with the CdS concentration. ZnO–CdS composites contain flower-like structures, their size being tuned by the CdS amount added during the chemical synthesis. The photocatalytic activity of the composites was analyzed under UV irradiation using powders impregnated with methylene blue; the tests confirming that the presence of CdS along the ZnO in composites can improve the dye discoloration. The biological properties such as antioxidant capacity, antibacterial activity, and cytotoxicity of the ZnO, CdS, and ZnO–CdS composites were evaluated. Thus, the obtained composites presented medium antioxidant effect, biocidal activity against Escherichia coli, and no toxicity (at concentrations less than 0.05 mg/mL for composites with a low CdS amount) for human fibroblast cells. Based on these results, such composites can be used as photocatalytic and/or biocidal additives for photoactive coatings, paints, or epoxy floors, which in their turn can provide a cleaner and healthier environment.

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Hayashi, Kenichiro, Kosuke Nozaki, Zhenquan Tan, Kazuhisa Fujita, Reina Nemoto, Kimihiro Yamashita, Hiroyuki Miura, Keiji Itaka, and Satoshi Ohara. "Enhanced Antibacterial Property of Facet-Engineered TiO2 Nanosheet in Presence and Absence of Ultraviolet Irradiation." Materials 13, no. 1 (December 22, 2019): 78. http://dx.doi.org/10.3390/ma13010078.

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Titania (TiO2) has attracted much attention recently for reducing bacterial diseases by the generation of reactive oxygen species (ROS) under UV irradiation. However, demand for higher photocatalytic activity due to higher recombination of electron and hole remains. The aims of this study were to make titania with higher antibacterial property and show the mechanisms of the bactericidal effect. In this study, we hydrothermally synthesized TiO2 nanosheets (NS) with highly-oriented structures. Samples were divided into five groups, depending on the fluorine/titanium ratio in the raw material, namely NS1.0, NS1.2, NS1.5, NS1.8, and NS2.0. Facet ratio and nanosheet size increased with an increase of fluorine/titanium ratio. The photocatalytic activity of TiO2 nanosheet was assessed by the generation of ROS. Hydroxyl radicals and superoxides were generated efficiently by ultraviolet light irradiation on NS1.5 and NS1.0, respectively. Antibacterial activity against Streptococcus mutans was assessed in the presence and absence of UV irradiation; NS1.0 showed superior antibacterial properties compared to commercially available TiO2 nanoparticles, under both conditions, due to the oxidation of intracellular components and cell membrane. These results together suggested TiO2 nanosheet induced bacterial cell death by oxidation, and TiO2 facet engineering resulted in enhancement of both photocatalytic and antibacterial activities of TiO2.

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