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Ozone photolysis of paracetamol in aqueous solution.
J. Environ. Sci. Health A Tox. Hazard. Subst. Environ. Eng. 48, 1264-1271 (2013)
The degradation of a paracetamol (N-acetil-para-aminofenol) aqueous solution (C-0 (P) = 5mmol L-1) is studied in a bench-scale setup by means of simple ozonation (O-3) and ozonation catalyzed with UV light (O-3/UV) in order to quantify the influence of UV light on the degradation process. The results have shown that under the adopted experimental conditions (25 degrees C, applied ozone dose = 9.8mg L-1 and gas flow rate of 20 L h(1)) both oxidative systems are capable of removing the substrate with mineralization degrees up to 51% for ozonation and 53% for O-3/UV. HPICE chromatography allowed the detection of nitrate ions and maleic and oxalic acids as ultimate carboxylic acids. The experimental data have been interpreted through 5 indicators: the conversion of paracetamol (X-P ), the conversion degree of TOC (X-TOC ), the apparent rate constant (k(ap) ), the Hatta number (Ha) and the enhancement factor (E). The main advantage of photo-ozonation compared to simple ozonation was a more advanced conversion (79% vs. 92% after 90min). The paracetamol decay follows a pseudofirst-order reaction with a superior rate constant (higher by 54%) for the UV catalyzed system in comparison with direct ozonation. Mineralization is slightly accelerated (+4%) in the O-3/UV system, due to the additional production of hydroxyl radicals induced by the UV light and a higher Hatta number (+24%). Nevertheless, the process was still in the slow reaction kinetic regime (Ha < 0.3), and the enhancement factor was not significantly increased. The results are useful for the design and scale-up of the gas-liquid processes.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Ozonation ; Paracetamol ; Advanced Oxidation Process ; Ozone Photolysis ; Rate Constant ; Enhancement Factor; Waste-water ; Ultraviolet-radiation ; Aquatic Environment ; Advanced Oxidation ; Hydrogen-peroxide ; Contrast-media ; Uv-radiation ; Ozonation ; Degradation ; Pharmaceuticals
ISSN (print) / ISBN
1093-4529
e-ISSN
1532-4117
Quellenangaben
Volume: 48,
Issue: 10,
Pages: 1264-1271
Publisher
Taylor & Francis
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
PPM-MEX-Molecular EXposomics (MEX)