E. coli inactivation by visible light irradiation using a Fe–Cd/TiO 2 photocatalyst: Statistical analysis and optimization of operating parameters

Feilizadeh, Mehrzad; Mul, Guido; Vossoughi, Manouchehr

doi:10.1016/j.apcatb.2014.12.034

Cited by 47 publications

(19 citation statements)

References 51 publications

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“…Among AOPs, heterogeneous photocatalysis using titanium dioxide (TiO 2 ) semiconductor has been proved to be an efficient approach for degrading both aquatic and atmospheric contaminants . The unique properties of TiO 2 , such as its high oxidizing power, non‐toxicity, high stability, low cost, and resistance to photo and chemical corrosion, make this photocatalyst suitable for the photocatalytic degradation processes .…”

Section: Introductionmentioning

confidence: 99%

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

et al. 2017

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In this study, for the first time a statistical analysis based on the response surface methodology (RSM) was employed to investigate individual and interaction effects of key operating parameters of the photocatalytic degradation under visible-light irradiation using Ag-S/PEG/TiO 2 . Ag-S/PEG/ TiO 2 is a visible-light-driven photocatalyst and was synthesized (based on earlier research) by co-doping of TiO 2 with silver and sulphur and addition of polyethylene glycol (as a reagent template). In addition, the model pollutant was methylene orange (MO) and the studied operating parameters included the photocatalyst loading, initial concentration of the pollutant, and pH of the solution. The statistics-based experimental design and RSM was utilized to find a quadratic model as a functional relationship between the degradation efficiency and the three operating parameters. The regression analysis with R 2 value of 0.9678 showed a close fit between the model prediction and experimental data of the degradation efficiency. The analysis of variance based on the model indicated that pH of the solution was the most influential factor, while the two other operating parameters were also significant. The efficiency of MO degradation reached 94.0 % under the optimum conditions (i.e. photocatalyst loading of 1.20 g/L, MO concentration of 5 mg/L, and pH of 2).

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Section: Introductionmentioning

confidence: 99%

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

et al. 2017

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“…Therefore, bare TiO 2 cannot utilize the majority of the sunlight reaching the surface of the earth since 43 % of solar energy lies in the wavelength range of visible light . Many attempts have been made to move the inception of the photo‐excitation of TiO 2 from the ultraviolet to the visible region . For this purpose, an efficient strategy is to dope TiO 2 with transition metal or non‐metal elements .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen peroxide‐assisted photocatalysis under solar light irradiation: Interpretation of interaction effects between an active photocatalyst and H₂O₂

2019

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In this work, the combination of H 2 O 2 and an active visible-light-driven photocatalyst (Ag-S/PEG/TiO 2 ) was utilized under natural solar radiation for the degradation of 2-nitrophenol (2-NP), and interaction effects between the photocatalyst and hydrogen peroxide were analyzed. For this purpose, experiments were designed using the response surface methodology based on the central composite design. The resulting data was utilized to obtain a model for the prediction of response (the degradation efficiency) as a function of two independent factors (H 2 O 2 concentration and the photocatalyst loading). The statistical analysis indicated that optimum values of each of the two independent factors decreased by increasing the other one and vice versa. Moreover, it was found that adding the optimal amount of H 2 O 2 to the solution, which contained just the photocatalyst, can enhance the degradation significantly (up to 45 %). However, using higher concentrations of H 2 O 2 may decrease the efficiency. The global optimum condition was found to be 545 ppm and 316 mM for Ag-S/PEG/TiO 2 loading and H 2 O 2 concentration, respectively. In this condition, the degradation efficiency of 2-NP reached 92.4 % after only 45 min of solar light irradiation.

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“…(Baş & Boyacı, ). RSM has been applied for many studies successfully to describe the behavior (growth or inactivation) of microorganisms for example; spores of Bacillus sporothermodurans inactivation by nisin (Aouadhi, Rouissi, Mejri, & Maaroufi, ), Escherichia coli inactivation by visible light irradiation (Feilizadeh, Mul, & Vossoughi, ), Staphylococcus aureus , Enterococcus faecalis , Bacillus subtilis , Escherichia coli inactivation by supercritical carbon dioxide (Hossain et al, ), thermal inactivation of Alicyclobacillus acidoterrestris spores (Silva, Gibbs, Vieira, & Silva, ), Vibrio parahaemolyticus inactivation by acidic electrolyzed water (Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Electro activated water mechanism onEscherichia coliandEnterococcus faecalisand optimization of operating parameters

Türkay

Şeker

Ramadhan

et al. 2017

J Food Process Preserv

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In this study, the efficacy of electro activated water (EAW) and its mechanism on Escherichia coli and Enterococcus faecalis were investigated. The effects of different operating parameters of EAW on inactivation of bacteria were evaluated by response surface methodology (RSM). The interaction of free chlorine concentration and treatment time at 25 °C had a synergetic effect on E. coli and E. faecalis inactivation. The increase in crystal violet uptake showed the deterioration of cell membrane permeability. The release of 260 nm absorbing materials from both bacteria increased after EAW treatment. Protein degeneration increased with deformation of E. coli and E. faecalis cell membranes, which in turn was followed by the release of proteins together with other intracellular components such as DNA, RNA, potassium, and phosphate. Practical applications An electrode module was setup to produce EAW from a mixture of salt and tap water. Freshly prepared EAW was added to the bacterial pellets, mixing thoroughly and immediately initiating a timer. The mixtures were set at different treatment times. The effects of three operating parameters (treatment time, free chlorine concentration (FCC) and temperature) on bacteria inactivation were investigated using Response surface methodology. Crystal violet uptake assay, 260 nm release study and FT‐IR spectroscopy analysis were conducted to determine the mechanism of action of EAW.

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E. coli inactivation by visible light irradiation using a Fe–Cd/TiO 2 photocatalyst: Statistical analysis and optimization of operating parameters

Cited by 47 publications

References 51 publications

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Hydrogen peroxide‐assisted photocatalysis under solar light irradiation: Interpretation of interaction effects between an active photocatalyst and H₂O₂

Electro activated water mechanism onEscherichia coliandEnterococcus faecalisand optimization of operating parameters

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E. coli inactivation by visible light irradiation using a Fe–Cd/TiO 2 photocatalyst: Statistical analysis and optimization of operating parameters

Cited by 47 publications

References 51 publications

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Individual and interaction effects of operating parameters on the photocatalytic degradation under visible light illumination: Response surface methodological approach

Hydrogen peroxide‐assisted photocatalysis under solar light irradiation: Interpretation of interaction effects between an active photocatalyst and H2O2

Electro activated water mechanism onEscherichia coliandEnterococcus faecalisand optimization of operating parameters

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Hydrogen peroxide‐assisted photocatalysis under solar light irradiation: Interpretation of interaction effects between an active photocatalyst and H₂O₂