期刊
CHEMICAL ENGINEERING JOURNAL
卷 253, 期 -, 页码 217-228出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.05.037
关键词
Oxytetracycline; Photo-Fenton mediated by ferrioxalate; Iron complexes; Solar radiation; Compound parabolic collectors (CPCs)
资金
- FEDER [PEst-C/EQB/LA0020/2013, PTDC/AAC-AMB/113091/2009, AQUAPHOTOBIO - PP-IJUP-2011-180]
- CT - Fundacao para a Ciencia e a Tecnologia
- U. Porto/Banco Santander Totta
- FCT - Fundacao para a Ciencia e a Tecnologia [SFRH/BD/62277/2009]
- FCT [IF/01501/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/62277/2009] Funding Source: FCT
This work demonstrates the application at near neutral pH of a photo-Fenton reaction mediated by ferricarboxylates on the treatment of aqueous solutions containing the antibiotic Oxytetracycline (OTC) under solar irradiation. The formation of a Fe:OTC complex after Fe2+ oxidation to Fe3+, in the presence of H2O2, showed the inconvenience of using the conventional Fe2+/H2O2/UV-Vis process at near neutral pH levels, as the complex is retained in the filter. To overcome this, a Fe3+/Oxalate/UV-Vis or Fe3+/Citrate/H2O2/UV-Vis process was proposed. The higher tendency of Fe3+ to form complexes with carboxylates avoids the formation of Fe:OTC complexes and allows for proper OTC detection along reaction times. The photo-Fenton process itself is improved by the extension of the iron solubility to higher and more practical pH values, by the increase of the quantum yield of Fe2+ production and by presenting stronger radiation absorption at wavelengths up to 580 nm. In this way, process efficiency was evaluated for different variables such as Fe3+ concentration, pH, temperature and irradiance, using a compound parabolic collector (CPC) photoreactor at lab-scale under simulated solar radiation. Reaction rates were compared in the presence of different inorganic anions and humic acids, and in two different real wastewater matrixes. Results obtained in a CPC pilot-scale plant under natural solar light, using an iron/oxalate molar ratio
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