EDDS As Complexing Agent for Enhancing Solar Advanced Oxidation Processes in Natural Water: Effect of Iron Species and Different Oxidants.

S. Miralles-Cuevas,I. Oller,A. Ruiz-Delgado,A. Cabrera-Reina, L. Cornejo-Ponce,S. Malato

Journal of Hazardous Materials（2018）SCI 1区

Univ Tarapaca | Plataforma Solar Almeria | Plataforma Solar Almeria CIEMAT

Cited 65|Views11

Abstract

The main purpose of this pilot plant study was to compare degradation of five microcontaminants (MCs) (antipyrine, carbamazepine, caffeine, ciprofloxacin and sulfamethoxazole at 100 mu g/L) by solar photo-Fenton mediated by EDDS and solar/Fe:EDDS/S2O82-. The effects of the Fe:EDDS ratio (1:1 and 1:2), initial iron species (Fe(It) or Fe(III) at 0.1 mM) and oxidizing agent (S2O82- or H2O2 at 0.25-1.5 mM) were evaluated. The higher the S2O82- concentration, the faster MC degradation was, with S2O82- consumption always below 0.6 mM and similar degradation rates with Fe(II) and Fe(III). tinder the best conditions (Fe 0.1 mM, Fe:EDDS 1:1, S2O82- mM) antipyrine, carbamazepine, caffeine, ciprofloxacin and sulfamethoxazole at 100 mu g/L where 90% eliminated applying a solar energy of 2 kJ/L (13 min at 30 W/m(2) solar radiation < 400 nm). Therefore, S2O82- promotes lower consumption of EDDS as Fe:EDDS 1:1 was better than Fe:EDDS 1:2. In photo-Fenton-like processes at circumneutral pH, EDDS with S2O82- is an alternative to H2O2 as an oxidizing agent.

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Key words

EDDS,Persulfate,Microcontaminants,Solar advanced oxidation processes,Neutral pH

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