Effect of solar simulated N-doped TiO2 photocatalysis on the inactivation and antibiotic resistance of an E. coli strain in biologically treated urban wastewater

Rizzo, Luigi; Sannino, Diana; Vaiano, Vincenzo; Sacco, Olga; Scarpa, A.; Pietrogiacomi, Daniela

doi:10.1016/j.apcatb.2013.07.033

Cited by 185 publications

(92 citation statements)

References 39 publications

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“…This field was relatively unexplored and several aspects needed to be studied; this knowledge area welcomed works conducted by Kositzi et al [7] and Polo-Lopez et al [8] and Rizzo et al [9], that have investigated several aspects of solar photolytic and photocatalytic treatment in different microorganisms (E. coli, Fusarium). Interest was also given in the enhancement of the process by technical means, such as compound parabolic collector (CPC) solar photo-reactors [10,11], with special focus given to the application and reuse of wastewater.…”

Section: Introductionmentioning

confidence: 99%

The antagonistic and synergistic effects of temperature during solar disinfection of synthetic secondary effluent

Giannakis

Darakas

Escalas-Cañellas

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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a b s t r a c tA 4-factor, multilevel, full factorial design of 240 experiments was performed in order to investigate the effect of temperature on the inactivation efficiency of spiked Escherichia coli in simulated solar disinfection of a synthetic secondary effluent. The initial population of the microorganisms was 10 3 , 10 4 , 10 5 and 10 6 CFU/mL, the exposure time 1, 2, 3 and 4 h, the treatment temperature 20, 30, 40, 50 and 60• C and the sunlight intensity 0, 800 and 1200 W/m 2 . Radical changes in bacterial behavior, process efficiency and remaining populations were observed, while treating effluents in discreet temperatures. Elevating treatment temperature from 20 to 40• C drastically impaired disinfection. Thermal inactivation with no regrowth predominated at 50• C and total inactivation of microorganisms was observed at 60• C in nonirradiated samples. Irradiation at 800 and 1200 W/m 2 much increased inactivation efficiency, especially at 50 and 60• C, proving sensitive light-temperature synergy at those temperatures. Total inactivation was achieved within 4 h under a range of treatment conditions, including all samples at 1200 W/m 2 , or 60• C samples at 800 W/m 2 . Also, 99.9-100% efficiencies and final population below 1000 CFU/100 mL were obtained at 800 W/m 2 and temperatures of 50 • C and above. Treatment time, temperature and intensity are the critical parameters for the disinfection process, while initial population is insignificant for removal efficiency. An explanation of the mechanism of the process as well as a general linear model predicting the outcome of the experiments is also suggested.

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Section: Introductionmentioning

confidence: 99%

The antagonistic and synergistic effects of temperature during solar disinfection of synthetic secondary effluent

Giannakis

Darakas

Escalas-Cañellas

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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“…Several works could be found in literature on the use of modified TiO 2 for inactivation of microorganisms. N-doped TiO 2 (NDT) photocatalytic material was investigated to find out its disinfection capability when UV-A is irradiated against ARB isolated from WWTP [83]. The ARB used was E. coli resistant to vancomycin and tetracycline.…”

Section: Solar-driven Aopsmentioning

confidence: 99%

Conventional and New Processes for Urban Wastewater Disinfection: Effect on Emerging and Resistant Microorganisms

Ferro

Polo-López

Fernández‐Ibáñez

2015

The Handbook of Environmental Chemistry

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The continuous release of chemical and microbiological pollutants into the environment and the increasing demand for safe water call for effective water and wastewater treatment processes. In particular, the detection of resistant microorganisms (e.g. antibiotic-resistant bacteria) in the effluents of urban wastewater treatment plants disposed into surface water or reused (e.g. in crop irrigation) shows that conventional treatments and disinfection processes do not effectively control the spread of pathogens into the environment. There is a need for new and more effective disinfection processes and technologies. The aim of this chapter is to briefly describe some of the emerging and antimicrobial-resistant microorganisms detected in wastewater, as well as the conventional and new advanced available technologies for wastewater disinfection, and to evaluate and discuss their effect on these microorganisms. Moreover, regulations and policies on wastewater reuse are also critically discussed and compared.

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“…Heterogeneous photocatalytic technology has been widely applied to treat wastewater because it can completely decompose all organic compounds to CO 2 , H 2 O, and corresponding inorganic ions [1,2]. As well known, semiconductors excited by light (hv C Eg) can generate electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced charge separation and simulated solar-driven photocatalytic performance of C–N-co-doped TiO2 prepared by sol–gel method

Chen

Zhong

et al. 2015

J Sol-Gel Sci Technol

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C-N-co-doped anatase TiO 2 photocatalysts were successfully prepared by a sol-gel method and characterized by Brunauer-Emmett-Teller method, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope (SEM), and surface photovoltage spectroscopy (SPS). The separation efficiency of photogenerated charges was investigated using benzoquinone as scavenger. An obvious redshift of the absorption edge of TiO 2 was observed owing to C and N doping. Moreover, doping C and N into TiO 2 increases the content of hydroxyl content on the surface of photocatalysts and photoinduced charge separation efficiency. The photocatalytic activity was evaluated by decolorization of methyl orange (MO) aqueous solution under simulated sun light and visible light irradiation. The results show that photocatalytic activities of the TiO 2 are greatly improved by C and N co-doping, which can be further confirmed by the removal of COD of MO aqueous solution. Graphical Abstract In general, the strong SPS response corresponds to the high separation rate of photoinduced charge carriers on the basis of the SPS principle. Thus, it can be confirmed that the C-, N-TiO 2 sample has a higher charge separation rate than the pure TiO 2 sample, and the 4 % C-, N-TiO 2 shows the highest charge separation rate 400 420 440 460 480 500 0.00 0.02 0.04 0.06 Photovoltage (mV) Wavelength (nm) 5%C-,N-TiO 2 0%C-,N-TiO 2 4%C-,N-TiO 2 300 350 400 450 500 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

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Effect of solar simulated N-doped TiO2 photocatalysis on the inactivation and antibiotic resistance of an E. coli strain in biologically treated urban wastewater

Cited by 185 publications

References 39 publications

The antagonistic and synergistic effects of temperature during solar disinfection of synthetic secondary effluent

The antagonistic and synergistic effects of temperature during solar disinfection of synthetic secondary effluent

Conventional and New Processes for Urban Wastewater Disinfection: Effect on Emerging and Resistant Microorganisms

Photoinduced charge separation and simulated solar-driven photocatalytic performance of C–N-co-doped TiO2 prepared by sol–gel method

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