Floating TiO2 photocatalyst for efficient inactivation of E. coli and decomposition of methylene blue solution

Varnagiris, Šarūnas; Urbonavičius, Marius; Sakalauskaitė, Sandra; Daugelavičius, Rimantas; Pranevičius, L.; Lelis, Martynas; Milčius, D.

doi:10.1016/j.scitotenv.2020.137600

Cited by 45 publications

(28 citation statements)

References 89 publications

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“…Table 5 represents the results obtained for the test of the cotton fabric covered with the TiO 2 particles of various titania content against gram-positive staphylococcus (S. aureus) and gram-negative coli bacillus (E. coli). According to the results obtained, staphylococcus has demonstrated higher sensitivity to the presence of TiO 2 than E. coli bacillus, which is consistent with the literature reports [70]. The higher the titania concentration, the higher the antibacterial effect towards S. aureus.…”

Section: Antimicrobal Activity Studiessupporting

confidence: 91%

Highly Defective Dark Nano Titanium Dioxide: Preparation via Pulsed Laser Ablation and Application

et al. 2020

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The development of methods to synthesize and study the properties of dark titania is of the utmost interest due to prospects for its use, primarily in photocatalysis when excited by visible light. In this work, the dark titania powder was prepared by pulsed laser ablation (Nd:YAG laser, 1064 nm, 7 ns) in water and dried in air. To study the changes occurring in the material, the thermal treatment was applied. The structure, composition, and properties of the obtained powders were studied using transmission electron microscopy, low-temperature N2 adsorption/desorption, X-ray diffraction, thermogravimetry/differential scanning calorimetry, X-ray photoelectron, Raman and UV-vis spectroscopies, and photoluminescence methods. The processes occurring in the initial material upon heating were studied. The electronic structure of the semiconductor materials was investigated, and the nature of the defects providing the visible light absorption was revealed. The photocatalytic and antibacterial activities of the materials obtained were also studied. Dark titania obtained via laser ablation in liquid was found to exhibit catalytic activity in the phenol photodegradation process under visible light (>420 nm) and showed antibacterial activity against Staphylococcus aureus and bacteriostatic effect towards Escherichia coli.

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Section: Antimicrobal Activity Studiessupporting

confidence: 91%

Highly Defective Dark Nano Titanium Dioxide: Preparation via Pulsed Laser Ablation and Application

et al. 2020

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“…These internal ROS are the cause of bacteria degradation. On this topic, the following article may be useful [ 33 ]. DCFH-DA is a cell-permeant reagent fluorogenic dye that measures hydroxyl, peroxyl, and other ROS activity in the cell.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Inactivation of Salmonella typhimurium by Floating Carbon-Doped TiO2 Photocatalyst

et al. 2021

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Photocatalysis application is considered as one of the most highly promising techniques for the reduction in wastewater pollution. However, the majority of highly efficient photocatalyst materials are obtained as fine powders, and this causes a lot of photocatalyst handling and reusability issues. The concept of the floating catalyst proposes the immobilization of a photocatalytic (nano)material on relatively large floating substrates and is considered as an encouraging way to overcome some of the most challenging photocatalysis issues. The purpose of this study is to examine floating photocatalyst application for Salmonella typhimurium bacteria inactivation in polluted water. More specifically, high-density polyethylene (HDPE) beads were used as a photocatalyst support for the immobilization of carbon-doped TiO2 films forming floating photocatalyst structures. Carbon-doped TiO2 films in both amorphous and anatase forms were deposited on HDPE beads using the low-temperature magnetron sputtering technique. Bacteria inactivation, together with cycling experiments, revealed promising results by decomposing more than 95% of Salmonella typhimurium bacteria in five consecutive treatment cycles. Additionally, a thorough analysis of the deposited carbon-doped TiO2 film was performed including morphology, elemental composition and mapping, structure, and depth profiling. The results demonstrate that the proposed method is a suitable technique for the formation of high-quality photocatalytic active films on thermal-sensitive substrates.

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“…Under UV-B light, it takes 120 min to degrade about 80% of 6 ppm MB while under sunlight it took 60 min to degrade about 90% of the same MB solution. Moreover, TiO 2 photocatalyst can also be applied for efficient inactivation of Escherichia coli [ 55 ]. In this case, the results showed that the combination of TiO 2 and UV-B light leads to the disruption of the outer membrane which causes the effective inactivation of E. coli bacteria.…”

Section: Heterogeneous Photocatalysismentioning

confidence: 99%

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

et al. 2021

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The application of TiO2 as a slurry catalyst for the degradation of contaminants of emerging concern (CEC) in liquid effluents has some drawbacks due to the difficulties in the catalyst reutilization. Thus, sophisticated and expensive separation methods are required after the reaction step. Alternatively, several types of materials have been used to support powder catalysts, so that fixed or fluidized bed reactors may be used. In this context, the objective of this work is to systematize and analyze the results of research inherent to the application of ceramic materials as support of TiO2 in the photocatalytic CEC removal from liquid effluents. Firstly, an overview is given about the treatment processes able to degrade CEC. In particular, the photocatalysts supported in ceramic materials are analyzed, namely the immobilization techniques applied to support TiO2 in these materials. Finally, a critical review of the literature dedicated to photocatalysis with supported TiO2 is presented, where the performance of the catalyst is considered as well as the main drivers and barriers for implementing this process. A focal point in the future is to investigate the possibility of depurating effluents and promote water reuse in safe conditions, and the supported TiO2 in ceramic materials may play a role in this scope.

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Floating TiO2 photocatalyst for efficient inactivation of E. coli and decomposition of methylene blue solution

Cited by 45 publications

References 89 publications

Highly Defective Dark Nano Titanium Dioxide: Preparation via Pulsed Laser Ablation and Application

Highly Defective Dark Nano Titanium Dioxide: Preparation via Pulsed Laser Ablation and Application

Photocatalytic Inactivation of Salmonella typhimurium by Floating Carbon-Doped TiO2 Photocatalyst

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

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