A new methodology to assess the performance of AOPs in complex samples: Application to the degradation of phenolic compounds by O3 and O3/UV-A–Vis. (May 2019)

• Record Type: Journal Article
• Authors: García-Ballesteros, S.; Mora, M.; Vicente, R.; Vercher, R.F.; Sabater, C.; Castillo, M.A.; Amat, A.M.; Arques, A.
• Is Part Of: Chemosphere. Volume 222(2019)
• Page Start: 114
• Page End: 123
• Publication Date: 2019-05
• Subjects: Ozone -- UV–Vis -- Phenolic compounds -- Doehlert matrix -- Toxicity -- Excitation–emission matrix fluorimetry; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.01.015
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A methodology combining experimental design methodology, liquid chromatography, excitation emission matrixes (EEM) and bioassays has been applied to study the performance of O3 and O3 /UVA-vis in the treatment of a mixture of eight phenolic pollutants. An experimental design methodology based on Doehlert matrixes was employed to determine the effect of pH (between 3 and 12), ozone dosage (02–1.0 g/h) and initial concentration of the pollutants (1–6 mg/L each). The following conclusions were obtained: a) acidic pH and low O3 dosage resulted in an inefficient process, b) increasing pH and O3 amount produced an enhancement of the reaction, and c) interaction of basic pH and high amounts of ozone decreased the efficiency of the process. The combination of O3 /UVA-vis was able to enhance ozonation in those experimental regions were this reagent was less efficient, namely low pH and low ozone dosages. The application of EEM-PARAFAC showed four components, corresponding to the parent pollutants and three different groups of reaction product and its evolution with time. Bioassys indicated important detoxification (from 100% to less than 30% after 1 min of treatment with initial pollutant concentration of 6 mg/L, pH = 9 and ozone dosage of 0.8 g/h) according to the studied methods ( D. magna and P. subcapitata ). Also estrogenic activity and dioxin-like behavior were significantly decreased. Graphical abstract: Image 10 Highlights: UV-A-vis light improves ozonation at acid pH and low O3 concentration. EEM is a good technique to detect intermediates in the oxidation process. PARAFAC is able to decompose the EEM into more simple components, allowing monitoring of the generated intermediates. This process resulted in a decrease in estrogenic and dioxine-like properties as well as detoxification (standard bioassays)