Solar-photocatalytic disinfection of Vibrio cholerae by using Ag@ZnO core–shell structure nanocomposites

Das, Swapan K; Sinha, Sayantan; Suar, Mrutyunjay; Yun, Soon‐Il; Mishra, Amrita; Tripathy, Suraj K.

doi:10.1016/j.jphotobiol.2014.10.021

Cited by 89 publications

(60 citation statements)

References 39 publications

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“…Many researchers have demonstrated a significantly extended light-absorption range and prolonging the lifetimes of photoexcited charge carriers through the decoration of noble metal nanoparticles onto ZnO [16][17][18][19]. This is mainly due to the respective effects of surface plasmon resonance (SPR) and the formation of a Schottky barrier at the metal-ZnO interface.…”

mentioning

confidence: 99%

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Wu¹,

Jian²,

Dang³

et al. 2017

Pol. J. Environ. Stud.

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mentioning

confidence: 99%

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Wu¹,

Jian²,

Dang³

et al. 2017

Pol. J. Environ. Stud.

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“…In Figure1 (c and d) bacterial disinfection is represented in its corresponding log reduction profile and the disinfection pattern is validated through comparison of the obtained profile with the standardized Chick-Watson model [11,[20][21]. Figure1 (a) and (b) suggests that amongst the concentration tested, 2 mg/L and 3mg/L resulted in complete disinfection (6 log reductions) of E. coli and S. aureus respectively in 60 min and 90 min respectively.…”

Section: Photocatalytic Disinfection Of Target Pathogensmentioning

confidence: 87%

“…To monitor and analyze the inactivation of microbes, 100 μL of collected samples were further diluted in 900 μL of sterile 0.9% NSS and a volume of 100 μL from the final diluted sample was spread on nutrient agar plates. The plates were left for overnight incubation at 37 o C. Following this, viable cell count was performed to obtain the results for the rate of disinfection [11,16]. The above steps were repeated using two commonly used catalysts ZnO and TiO2 (Degussa P25) for comparative studies and with the optimum catalyst concentration for proper disinfection as obtained by Ag@ZnO.…”

Section: Photocatalytic Disinfection Experimentsmentioning

confidence: 99%

“…Additionally for further confirmation the post reaction water sample was analyzed using MP-AES to detect the leaching of Ag + and Zn 2+ ions during the photocatalytic disinfection experiment [11]. Catalyst was recovered by centrifugation at 10000 g for 30 min and dried at 80 o C and reused for the photocatalytic disinfection application.…”

Section: Stability and Reusability Of The Photocatalystmentioning

confidence: 99%

“…At optical density (OD600) 0.6 for E. coli and 0.8 for S. aureus, corresponding to 10 CFU/ml (CFU = colony forming unit), the bacteria were harvested by centrifugation at 5000 rpm for 10 min. They were thereafter washed with 0.9 % normal saline solution (NSS) to provide appropriate osmotic conditions [11]. All the glassware and plastic-ware used for media preparation, experimental purposes and analysis were sterilized by autoclaving at 121 o C, for 20 min before being used [15].…”

Section: Introductionmentioning

confidence: 99%

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Disinfection of Water Borne Pathogens <em>Escherichia coli</em> and <em>Staphylococcus aureus</em> by Solar Photocatalysis using Sonochemically Synthesized Reusable Ag@ZnO Core-shell Nanoparticles

Das¹,

Ranjana²,

Misra³

et al. 2017

Preprint

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Abstract:Water borne pathogens present a threat to human health and their disinfection from water poses a challenge, prompting search for newer methods and newer materials. Disinfection of Gram-negative bacterium Escherichia coli and Gram-positive coccal bacterium Staphylococcus aureus in aqueous matrix was achieved within 60 and 90 minutes respectively at 35⁰C using solarphotocatalysis mediated by sonochemically synthesized Ag@ZnO core-shell nanoparticles. The efficiency of the process increased with increase in temperature and at 55⁰C the disinfection could be achieved in 45 and 60 min respectively for the two bacteria. A new ultrasound assisted chemical precipitation technique was used for the synthesis of Ag@ZnO core-shell nanoparticles. The characteristics of the synthesized material were established using physical techniques. The material remained stable even at 400 o C. Disinfection efficiency of the Ag@ZnO core-shell nanoparticles was confirmed in case of real world water samples from pond, river, municipal tap and was found to be better than that of pure ZnO and TiO2 (Degussa P25). When the nanoparticle based catalyst was recycled and reused for subsequent disinfection experiments, its efficiency did not change remarkably even after three cycles. The sonochemically synthesized Ag@ZnO core-shell nanoparticles have a good potential for application in solar photocatalytic disinfection of water borne pathogens.

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Two‐dimensional nanomaterials for photocatalytic water disinfection: recent progress and future challenges

Liu

Zeng

et al. 2018

J of Chemical Tech & Biotech

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Photocatalysis has received ever‐growing attention as a promising alternative to traditional water treatment technologies for waterborne biohazard inactivation. Due to unique optical, electronic, physicochemical properties and feasibility of functional architecture assembly, two‐dimensional (2D) nanomaterials have become important in developing novel photocatalysts. This review summarizes the recent progress in configuring nanostructures with 2D materials as building blocks for photocatalytic water disinfection. In this review, five categories of 2D nanomaterials, that is, graphene, graphitic carbon nitride, 2D metal oxides and metallates, metal oxyhalides and transition metal dichalcogenides, for photocatalytic pathogen inactivation are introduced. First, the synthesis process, nanostructure engineering and disinfection performance of 2D‐based photocatalysts are reviewed in categories. In the following section, the bacteria destruction mechanism based on the generation and roles of reactive species (RSs) is presented. Moreover, the effects of the chemical characteristics of the water matrix on photocatalytic bactericidal performance are discussed. Finally, the challenges regarding the development and application of 2D‐based photocatalysts for highly efficient water sterilization are highlighted. © 2018 Society of Chemical Industry

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Solar-photocatalytic disinfection of Vibrio cholerae by using Ag@ZnO core–shell structure nanocomposites

Cited by 89 publications

References 39 publications

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Disinfection of Water Borne Pathogens <em>Escherichia coli</em> and <em>Staphylococcus aureus</em> by Solar Photocatalysis using Sonochemically Synthesized Reusable Ag@ZnO Core-shell Nanoparticles

Two‐dimensional nanomaterials for photocatalytic water disinfection: recent progress and future challenges

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