Noble metal-modified titania with visible-light activity for the decomposition of microorganisms

Endo, Masayuki; Wei, Zhishun; Wang, Kunlei; Karabiyik, Baris; Yoshiiri, Kenta; Rokicka, Paulina; Ohtani, Bunsho; Markowska‐Szczupak, Agata; Kowalska, Ewa

doi:10.3762/bjnano.9.77

Cited by 41 publications

(41 citation statements)

References 81 publications

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“…Based on their structural morphology, it has been hypothesized that the destruction caused by titania photocatalysis would not be effective. However, from our previous studies, it has been known that although titania could not cause the complete fungal growth inhibition, it could cause the reduction of spores' number and mycotoxin generation [33,35,38]. The highest sensitivity of fungi to titania, activated under irradiation, was observed for young cells just after germination (on day 1).…”

Section: Discussionmentioning

confidence: 92%

The Influence of The Light-Activated Titania P25 on Human Breast Cancer Cells

2020

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Cosmetics and other daily care products contain titanium(IV) oxide (titania). Since multiple risk factors can increase the chance of developing cancer, an evaluation of titania safety has become a matter of concern in recent times. However, it should be pointed out that titania as an efficient photocatalyst has been also applied for inactivation of various pathogens, environmental purification and energy conversion, which might result in significant improvement of human life. Therefore, it is worth considering titania not only as a possible cancer initiator, but also as an efficient solution against cancer cells. Accordingly, in this study, the effect of commercial titania photocatalyst P25 (Degussa/Evonik) on breast adenocarcinoma MCF7 cells (ATCC® HTB-22™, breast adenocarcinoma cell line from human) has been investigated. The cells were treated with titania at doses of 10, 30, and 50 µg/mL under UVA/vis irradiation and in the dark. The significant morphological alterations in living cells were observed for larger doses of titania, such as changes in the shape and the size of cells, the deviation from the normal structure, and an increase in cells’ mortality. Moreover, the effect was significantly higher under irradiation than in the dark confirming strong photocatalytic activity of titania P25. In contrast, the lowest dose of titania (10 µg/mL) did not exhibit a significant impact on MCF7 cells, similarly to the nontreated cells. Accordingly, it has been proposed that locally applied titania might be considered for a cancer therapy after necessary in vivo tests to estimate any possibilities of side effects.

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Section: Discussionmentioning

confidence: 92%

The Influence of The Light-Activated Titania P25 on Human Breast Cancer Cells

2020

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“…Previous study reported that the generated ROS initially attack the cell wall membrane and cause detachment of cell wall (Kiwi andNadtochenko, 2005, Lemire et al, 2013). Longer irradiation time is needed to induce disruption of cytoplasmic membrane followed by DNA and protein damage that are leading to cell death (Carre et al, 2014, Daly et al, 2007, Endo et al, 2018. The plot in Figure 5-6 show the relationship between the energy of light (hv) on the abscissa and the quantity of (F(R)hv) 1/2 on the ordinate.…”

Section: Factors Governing Photocatalytic Performancementioning

confidence: 99%

“…This technique substitutes the metal (titanium) or the non-metal (oxygen) component in order to alter the optical properties of TiO 2 nanomaterial. The study byEndo et al (2018) show that doped the commercial Titania samples with metal such as silver or gold result in excellent visible-light driven photodecomposition of microorganisms. An alternative technique…”

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confidence: 98%

Photocatalytic cementitious material for self-cleaning and anti-microbial application

Hamdany¹

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First of all, the author would like to express his greatest gratitude to his supervisor, Assistant Professor Qian Shunzhi, not only for his invaluable supervision and advice but also for sharing his experiences, encouragement and motivation throughout the journey of his PhD program. The author owes his deepest gratitude to Dr Wei Li and Dr Ding Yuanzhao for their endless assistance and patience in guiding and helping the author on experimental design, chemical synthesis, microbiological related experiments, training for using equipment and report writing. The author would also like to extend his sincere gratitude to Nanyang Technological University for the NTU research scholarship. The author would like to thank all colleagues in his group (Weng Yiwei, Lu Bing, Liu Siyu, Dr Zhang Zhigang), Dr Martin Wijaya (CEE), Dr Ronny William (SPMS), and Dr Namyo Salim (CEE) for their comments and helpful discussion. The author also would like to thank all of PhD students in Prof Chen Yuan's group, Mr Cheng from CT Lab, Mr Phua from CT Lab, Ms Lim, Han Khiang from Environmental Lab and technicians that have not been mentioned for all the helps and friendship through these years. Finally, the author would like to express his utmost gratitude to his family who has given continuous moral support and encouragement to the author. Chapter 4. Graphene-based TiO 2 nanocomposites for enhanced visible light degradation of organic dye and antibacterial effect of Escherichia coli 53 4.

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“…Antibacterial activity was evaluated using Escherichia coli K12 (ATCC29425, Manassas, VA, USA) as a model of bacteria. The procedure was described elsewhere [31]. In brief, 10 mg of sample was suspended in 7 mL of bacterial suspension (ca.…”

Section: Activity Testsmentioning

confidence: 99%

Carbon/Graphene-Modified Titania with Enhanced Photocatalytic Activity under UV and Vis Irradiation

et al. 2019

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Laser synthesis was used for one-step synthesis of titania/graphene composites (G-TiO 2 (C)) from a suspension of 0.04 wt% commercial reduced graphene oxide (rGO) dispersed in liquid titanium tetraisopropoxide (TTIP). Reference titania sample (TiO 2 (C)) was prepared by the same method without graphene addition. Both samples and commercial titania P25 were characterized by various methods and tested under UV/vis irradiation for oxidative decomposition of acetic acid and dehydrogenation of methanol (with and without Pt co-catalyst addition), and under vis irradiation for phenol degradation and inactivation of Escherichia coli. It was found that both samples (TiO 2 (C) and G-TiO 2 (C)) contained carbon resulting from TTIP and C 2 H 4 (used as a synthesis sensitizer), which activated titania towards vis activity. The photocatalytic activity under UV/vis irradiation was like that by P25. The highest activity of TiO 2 (C) sample for acetic acid oxidation was probably caused by its surface enrichment with hydroxyl groups. G-TiO 2 (C) was the most active for methanol dehydrogenation in the absence of platinum (ca. five times higher activity than that by TiO 2 (C) and P25), suggesting that graphene works as a co-catalyst for hydrogen evolution. High activity under both UV and vis irradiation for decomposition of organic compounds, hydrogen evolution and inactivation of bacteria suggests that laser synthesis allows preparation of cheap (carbon-modified) and efficient photocatalysts for broad environmental applications.

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Noble metal-modified titania with visible-light activity for the decomposition of microorganisms

Cited by 41 publications

References 81 publications

The Influence of The Light-Activated Titania P25 on Human Breast Cancer Cells

The Influence of The Light-Activated Titania P25 on Human Breast Cancer Cells

Photocatalytic cementitious material for self-cleaning and anti-microbial application

Carbon/Graphene-Modified Titania with Enhanced Photocatalytic Activity under UV and Vis Irradiation

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