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Assessing some advanced oxidation processes in the abatement of phenol aqueous solutions

Jaramillo-Sierra Bethsabet, Mercado-Cabrera Antonio, Peña-Eguiluz Rosendo, Hernández-Arias Alma Neli, López-Callejas Régulo, Rodríguez-Méndez Benjamín Gonzalo, Valencia-Alvarado Raúl

Environment Protection Engineering

2019

Vol. 45, nr 3

23--38

In this work, phenol oxidation in aqueous solution promoted by the effect of the oxidizing agents H2O2, O3 and UV radiation and their synergy in four different advanced oxidation processes (O3, O3/UV, H2O2/O3 and O3/H2O2/UV) were assayed. Studies were performed with a closed-loop hydraulic circuit set up with a relatively high volume of solution (500 cm3) during 90 min of treatment time. Parameters such as concentration for oxidizing species, pH, presence of UV irradiation were evaluated. The resulting degradation efficiencies were evaluated using GC-MS. The agents here used were selected considering their ease of handling and low toxicity, generation of deposited matter or sludge, so a filtration treatment for the analysis of the samples was not required. In all cases, it was observed that with increasing treatment time better degradation efficiencies were obtained. The best results were obtained with the combination of O3/H2O2/UV where up to 95% degradation was attained at pH 9, which is due to active species generated in the process, e.g., O3 and OH˙, on the contaminant. SPE was performed for determining the presence of several by-products, mainly: catechol, resorcinol and hydroquinone, which were identified.