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Sonochemical degradation of propylparaben in the presence of agro-industrial biochar

Nikolaou Stavroula, Vakros John, Diamantopoulos Evaggelos, Mantzavinos Dionysis

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URIhttp://purl.tuc.gr/dl/dias/7853D61B-DACB-4B9D-A37B-0C667090A371-
Identifierhttps://doi.org/10.1016/j.jece.2020.104010-
Identifierhttps://www.sciencedirect.com/science/article/pii/S2213343720303584-
Languageen-
Extent8 pagesen
TitleSonochemical degradation of propylparaben in the presence of agro-industrial biocharen
CreatorNikolaou Stavroulaen
CreatorVakros Johnen
CreatorDiamantopoulos Evaggelosen
CreatorΔιαμαντοπουλος Ευαγγελοςel
CreatorMantzavinos Dionysisen
CreatorΜαντζαβινος Διονυσηςel
PublisherElsevieren
Content SummaryThe degradation of propylparaben (PP) by 20 kHz ultrasound irradiation in the presence of biochar was investigated. The biochar was produced from rice husk and characterized exhaustively by several techniques. It contains high percentage of stable, amorphous carbon with a considerable number of aromatic moieties and about 60 % of ash content, exhibits a specific surface area of 70.6 m2/g and has a slightly basic surface with a pzc around 8. Batch experiments were performed with a horn-type sonicator, mainly in ultrapure water (UPW), while actual matrices such as bottled water, groundwater and treated wastewater were also tested to assess the effect of water constituents on degradation. The simultaneous use of ultrasound and biochar had a synergistic effect on PP degradation relative to the individual processes, i.e. silent adsorption and irradiation without biochar, resulting in about 60 % synergy. The pseudo-first order rate increased with increasing power density and biochar concentration (up to a certain value) and decreasing temperature and PP concentration, while basic or acidic conditions retarded degradation. Higher PP concentrations resulted in lower rate constants, thus pointing out that the production of radicals was the rate-determining step. Reactions in actual matrices were slower than in UPW (i.e. up to ten times) and this was ascribed to the various inorganic (i.e. bicarbonate, chloride) and organic (i.e. humic acid analogues) water constituents.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2021-06-30-
Date of Publication2020-
SubjectAdsorptionen
SubjectParabensen
SubjectSonochemistryen
SubjectSynergyen
SubjectWaste valorizationen
SubjectWater matrixen
Bibliographic CitationS. Nikolaou, J. Vakros, E. Diamadopoulos, and D. Mantzavinos, “Sonochemical degradation of propylparaben in the presence of agro-industrial biochar”, J. Environ. Chem. Eng., vol. 8, no. 4, Aug. 2020. doi: 10.1016/j.jece.2020.104010en

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