Possible degradation pathways of triclosan from aqueous systems via TiO2 assisted photocatalyis

Constantin, Lucian Alexandru; Niţoi, Ines; Cristea, Nicolae Ionut; Constantin, Mirela Alina

doi:10.1016/j.jiec.2017.09.020

Cited by 42 publications

(15 citation statements)

References 23 publications

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“…Among the transformation intermediates, the occurrence of dioxin-like compounds is also concerning. For example, the formation of 2,8-dichlorodibenzo-p-dioxin was identified by the use of GC-MS (see SM), which is in good agreement with previous studies (Chen et al, 2008;Constantin et al, 2018;Latch et al, 2005;Lores et al, 2005). The identified dioxin is likely to be less toxic to aquatic organisms than the intermediates with 3 or 4 aromatic rings, but toxicity to mammals could be an issue, and even to fish if the detoxification metabolism is blocked (Sijm and Opperhuizen, 1988).…”

Section: Reaction Mechanism Based On the Detected By-productssupporting

confidence: 90%

Tracking photodegradation products and bond-cleavage reaction pathways of triclosan using ultra-high resolution mass spectrometry and stable carbon isotope analysis

Liu

Mekić

Carena

et al. 2020

Environmental Pollution

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Triclosan (TCS) is an antimicrobial compound ubiquitously found in surface waters throughout the world. Although several studies have focused on the photochemical degradation of TCS, there is still limited knowledge about its environmental fate. In this study, we got molecular-level insights into the photochemical degradation of TCS.Significant stable carbon isotope fractionation was observed during photodegradation; different bond-cleavage reaction pathways under different photolytic conditions were characterized, using compound specific isotope analysis (CSIA). Photochemical modeling of TCS photodegradation showed that direct photolysis would be the main transformation pathway if pH > 7, even in presence of dissolved organic matter. Moreover, by use of ultrahigh resolution mass spectrometry, FT-ICR-MS, a broad and complex spectrum of organic by-products (some of which potentially toxic, as assessed by a quantitative structureactivity relationship approach) were identified. A detailed reaction mechanism was developed on the basis of the detected compounds.

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Section: Reaction Mechanism Based On the Detected By-productssupporting

confidence: 90%

Tracking photodegradation products and bond-cleavage reaction pathways of triclosan using ultra-high resolution mass spectrometry and stable carbon isotope analysis

Liu

Mekić

Carena

et al. 2020

Environmental Pollution

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“…In this context, it is important to note that while there are different ways to generate the • OH radical species, there are also reports on the use of different AOPs to remove triclosan from aqueous effluents. Among the AOPs explored for triclosan degradation, photocatalysis [12], Fenton [13], electro-Fenton [14], electrochemical oxidation [15] and ozonation [16], stand out as successful approaches and among these, the electro-Fenton treatment of contaminated water, is particularly attractive since it works by electrochemically producing H 2 O 2 from dissolved oxygen reduction at a carbonaceous electrode surface (see Reaction (1)),O2+2H++2e-→H2O2…”

Section: Introductionmentioning

confidence: 99%

Electrochemical degradation of triclosan in aqueous solution. A study of the performance of an electro-Fenton reactor

García‐Espinoza

Robles

Gil

et al. 2019

Journal of Environmental Chemical Engineering

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“…Triclosan (TCS or 2,4,4 -Trichloro-2 -hydroxydiphenyl ether) is a broad antimicrobial agent, with low water-solubility (more susceptible to bio-accumulation) and that has been used for more than 50 years as an antiseptic, disinfectant, or preservative in clinical settings and several consumer products, i.e., toothpastes, cosmetics, and plastics. On the basis of the available studies, it is now accepted that it has extensive environmental and health effects, also being toxic to water living organisms due to its photodegradation to chlorodioxins [13,14]. TCS has been detected in wastewater treatments plants and surface waters [15,16].…”

Section: Introductionmentioning

confidence: 99%

Electronic Tongue Coupled to an Electrochemical Flow Reactor for Emerging Organic Contaminants Real Time Monitoring

Magro

Mateus

Paz‐Garcia

et al. 2019

Sensors

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Triclosan, which is a bacteriostatic used in household items, has raised health concerns, because it might lead to antimicrobial resistance and endocrine disorders in organisms. The detection, identification, and monitoring of triclosan and its by-products (methyl triclosan, 2,4-Dichlorophenol and 2,4,6-Trichlorophenol) are a growing need in order to update current water treatments and enable the continuous supervision of the contamination plume. This work presents a customized electronic tongue prototype coupled to an electrochemical flow reactor, which aims to access the monitoring of triclosan and its derivative by-products in a real secondary effluent. An electronic tongue device, based on impedance measurements and polyethylenimine/poly(sodium 4-styrenesulfonate) layer-by-layer and TiO2, ZnO and TiO2/ZnO sputtering thin films, was developed and tested to track analyte degradation and allow for analyte detection and semi-quantification. A degradation pathway trend was observable by means of principal component analysis, being the sample separation, according to sampling time, explained by 77% the total variance in the first two components. A semi-quantitative electronic tongue was attained for triclosan and methyl-triclosan. For 2,4-Dichlorophenol and 2,4,6-Trichlorophenol, the best results were achieved with only a single sensor. Finally, working as multi-analyte quantification devices, the electronic tongues could provide information regarding the degradation kinetic and concentrations ranges in a dynamic removal treatment.

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Possible degradation pathways of triclosan from aqueous systems via TiO2 assisted photocatalyis

Cited by 42 publications

References 23 publications

Tracking photodegradation products and bond-cleavage reaction pathways of triclosan using ultra-high resolution mass spectrometry and stable carbon isotope analysis

Tracking photodegradation products and bond-cleavage reaction pathways of triclosan using ultra-high resolution mass spectrometry and stable carbon isotope analysis

Electrochemical degradation of triclosan in aqueous solution. A study of the performance of an electro-Fenton reactor

Electronic Tongue Coupled to an Electrochemical Flow Reactor for Emerging Organic Contaminants Real Time Monitoring

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