Repeated photocatalytic inactivation of E. coli by UV + Ni foam@TiO2: Performance and photocatalyst deactivation

Wang, Miao; Xu, Zhe; Qi, Zhenlian; Cai, Yiwei; Li, Guiying; Choi, Wonyong; An, Taicheng

doi:10.1016/j.cej.2023.143680

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…Furthermore, we investigated the germicidal disinfection performance of the O 3 –MeCN system. A 5 mL suspension of E. coli was placed in 15 mL of MeCN and stirred, and the number of viable bacteria was determined after each sample through the dilution coating plate method. , Figure S8 demonstrates that E. coli cannot survive in a MeCN solution alone, indicating that the low biotoxicity of MeCN itself can effectively kill E. coli . Moreover, when the bactericidal property of O 3 is introduced into MeCN, the strong bactericidal property of O 3 further enhances the germ-killing ability.…”

Section: Results and Discussionmentioning

confidence: 99%

“…A 5 mL suspension of E. coli was placed in 15 mL of MeCN and stirred, and the number of viable bacteria was determined after each sample through the dilution coating plate method. 25,37 Finally, a comprehensive quantitative assessment was conducted to evaluate the environmental and economic aspects of the O 3 −MeCN recycling process for fast screening kits in a rational manner. As an illustrative example, each ton of waste from the colloidal Au method kits was estimated to comprise 227 100 individual kits, containing approximately 0.61 g of Au, 969.72 kg of plystyrene plastic (PS), and 24.75 kg of nitrocellulose.…”

Section: Exploration Of the Mechanismmentioning

confidence: 99%

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Resource Recovery Strategy of Rapid Screening Kits for Diseases through Ozonation

Shang,

Wang,

Chen

et al. 2023

Environ. Health

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Rapid disease screening kits are widely used due to their efficiency and convenience in disease screening. However, the resulting medical waste poses a significant environmental burden. Recycling this waste in a resourceful manner not only protects the environment from pollution but also maximizes savings in resources and energy consumption. In this study, we developed a scalable, simple, and efficient method for the resourceful recovery of assay kits. The method achieves simultaneous 100% pathogen inactivation in the kits, complete leaching of gold nanoparticles (Au NPs), and nondestructive recovery of plastics and tampons. Additionally, our mechanistic study on Au leaching has demonstrated that water plays a crucial role as the initiator for the Au dissolution reaction, and the hydroxyl radical (•OH) serves as an important reactive oxygen species. This research introduces a novel approach for dissolving the precious metal gold and provides a viable technology for the resource utilization of waste disease screening kits.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Exploration Of the Mechanismmentioning

confidence: 99%

Resource Recovery Strategy of Rapid Screening Kits for Diseases through Ozonation

Shang,

Wang,

Chen

et al. 2023

Environ. Health

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“…In order to change the surface characteristics of the photocatalysts, the aqueous substances may first bind to them through covalent bonds, electrostatic effects, interaction, and secondary bonds. Second, the altered surface charge may cause the photocatalysts to aggregate, and a strong adsorbate–surface contact may cause the photocatalysts to dissolve [ 8 ]. Numerous studies have shown that exposure to dye-contaminated water can cause damage to various organs, including the thyroid, conjunctiva/cornea, brain, kidney, liver, gastrointestinal tract, and reproductive system [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Green Biosynthesis of Zinc Oxide Nanoparticles Using Pluchea indica Leaf Extract: Antimicrobial and Photocatalytic Activities

et al. 2023

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Nanotechnology is playing a critical role in several essential technologies with nanoscale structures (nanoparticles) in areas of the environment and biomedicine. In this work, the leaf extract of Pluchea indica was utilized to biosynthesize zinc oxide nanoparticles (ZnONPs) for the first time and evaluated for antimicrobial and photocatalytic activities. Different experimental methods were used to characterize the biosynthesized ZnONPs. The biosynthesized ZnONPs showed maximum Ultraviolet–visible spectroscopy (UV-vis) absorbance at a wavelength of 360 nm. The X-Ray diffraction (XRD) pattern of the ZnONPs exhibits seven strong reflection peaks, and the average particle size was 21.9 nm. Fourier-transform infrared spectroscopy (FT-IR) spectrum analysis reveals the presence of functional groups that help in biofabrication. The existence of Zn and O was confirmed by the Energy-dispersive X-ray (EDX) spectrum and the morphology by SEM images. Antimicrobial studies showed that the biosynthesized ZnONPs have antimicrobial efficacy against Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Bacillus subtilis, Staphylococcus aureus, Candida albicans and Cryptococcus neoformans where inhibition zones at concentration 1000 µg/mL were 21.83 ± 0.76, 13.0 ± 1.1, 14.9 ± 0.85, 24.26 ± 1.1, 17.0 ± 1.0, 20.67 ± 0.57 and 19.0 ± 1.0 mm respectively. Under both dark and sunlight irradiation, the photocatalytic activity of ZnONPs was evaluated towards the degradation of the thiazine dye (methylene blue-MB). Approximately 95% of the MB dye was broken down at pH 8 after 150 min of sunlight exposure. The aforementioned results, therefore, suggest that ZnONPs synthesized by implementing environmentally friendly techniques can be employed for a variety of environmental and biomedical applications.

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“…In recent years, there has been growing interest in using semiconductor materials [ 1 , 2 , 3 ] as photocatalysts [ 4 , 5 ] for degrading low concentrations of organic and inorganic molecules in freshwater treatment [ 6 ], environmental remediation [ 7 , 8 ], industrial [ 9 ], and health applications [ 10 , 11 ]. Various types of semiconductors, such as TiO 2 [ 12 ], ZnO [ 13 ], ZnS [ 14 ], CdS [ 15 ], and others, have been reported for photocatalytic decontamination over the past two decades.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability

Ying,

Liu,

Jin

et al. 2023

Nanomaterials

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To provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain iron oxide (FeOx). Subsequently, we successfully synthesized a cost-effective, magnetic CQDs/FeOx photocatalytic composite for the first time by combining the resulting CQDs and FeOx. Our findings demonstrated that calcining IOS in an air atmosphere enhanced the content of photocatalytically active α-Fe2O3, while incorporating WRN-based CQDs into FeOx improved the electron-hole pair separation, resulting in increased O2 reduction and H2O oxidation. Under optimized conditions (IOS calcination temperature: 300 °C; carbon loading: 11 wt%), the CQDs/FeOx composite, utilizing WRN and IOS as its foundation, exhibited exceptional and reusable capabilities in photodegrading methylene blue and tetracycline. Remarkably, for methylene blue, it achieved an impressive degradation rate of 99.30% within 480 min, accompanied by a high degradation rate constant of 5.26 × 10−3 min−1. This composite demonstrated reusability potential for up to ten photocatalytic cycles without a significant reduction in the degradation efficiency, surpassing the performance of IOS and FeOx without CQDs. Notably, the composite exhibited strong magnetism with a saturation magnetization strength of 34.7 emu/g, which enables efficient and convenient recovery in photocatalytic applications. This characteristic is highly advantageous for the large-scale industrial utilization of photocatalytic water purification.

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Repeated photocatalytic inactivation of E. coli by UV + Ni foam@TiO2: Performance and photocatalyst deactivation

Cited by 10 publications

References 61 publications

Resource Recovery Strategy of Rapid Screening Kits for Diseases through Ozonation

Resource Recovery Strategy of Rapid Screening Kits for Diseases through Ozonation

Green Biosynthesis of Zinc Oxide Nanoparticles Using Pluchea indica Leaf Extract: Antimicrobial and Photocatalytic Activities

Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability

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