Abstract
This paper addresses the removal of four aromatic hydrocarbons typically found in petrochemical wastewater: benzene (B), toluene (T), o-xylene (X), and naphthalene (N), by microwave-assisted catalytic wet peroxide oxidation (MW-CWPO) using activated carbon (AC) as catalyst. Under the studied conditions, complete pollutant elimination (B, 1.28 mM; T, 1.09 mM; X, 0.94 mM; and N, 0.78 mM) was achieved, with more than 90% TOC removal after only 15-min reaction time, working at 120 °C, pH0 = 3, AC at 1 g L−1, and H2O2 at the stoichiometric dose. Furthermore, in the case of toluene, naphthalene, and xylene, the hydroxylation and breakdown of the ring is very rapid and toxic intermediates were not detected. The process follows two steps: (i) pollutant adsorption onto AC followed by (ii) adsorbed compounds oxidation. Thus, MW-CWPO with AC as catalyst appears a promising way for a fast and effective process for B, T, X, and N removal in aqueous phase.
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Funding
Authors would like to thank the Spanish Ministerio de Economía y Competitividad (MINECO) for financial support through project CTM2016-76454-R. A.L. Garcia-Costa acknowledges the European Social Fund and MINECO for PhD grant BES-2014-067598.
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Garcia-Costa, A.L., Lopez-Perela, L., Xu, X. et al. Activated carbon as catalyst for microwave-assisted wet peroxide oxidation of aromatic hydrocarbons. Environ Sci Pollut Res 25, 27748–27755 (2018). https://doi.org/10.1007/s11356-018-2291-9
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DOI: https://doi.org/10.1007/s11356-018-2291-9