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AuthorDbira, Sondos
AuthorBensalah, Nasr
AuthorZagho, Moustafa M.
AuthorEnnahaoui, Massouda
AuthorBedoui,Ahmed
Available date2020-05-15T00:15:04Z
Publication Date2019
Publication NameApplied Sciences (Switzerland)
ResourceScopus
ISSN20763417
URIhttp://dx.doi.org/10.3390/app9010156
URIhttp://hdl.handle.net/10576/14930
AbstractTannic acid (TA) is a major pollutant present in the wastewater generated from vegetable tanneries process and food processing. This work studied TA degradation by two advanced oxidation processes (APOs): UV irradiation at the wavelength of 254 nm in the presence of hydrogen peroxide (H2O2) and ferrous iron (photo-Fenton) and in the presence of potassium persulfate. The influence of certain experimental parameters such as K2S2O8, H2O2, Fe2+, and TA concentrations, initial pH and temperature was evaluated in order to obtain the highest efficiency in terms of aromatics (decay in UV absorbance at 276 nm) and TOC removals. Chemical oxidation of TA (0.1 mM) by UV/persulfate achieved 96.32% of aromatics removal and 54.41% of TOC removal under optimized conditions of pH = 9 and 53.10 mM of K2S2O8 after 60 min. The treatment of TA by photo-Fenton process successfully led to almost complete aromatics removal (99.32%) and high TOC removal (94.27%) from aqueous solutions containing 0.1 mM of TA at natural pH = 3 using 29.4 mM of H2O2 and 0.18 mM of Fe2+ at 25 C after 120 min. More efficient degradation of TA by photo-Fenton process than UV/persulfate was obtained, which confirms that hydroxyl radicals are more powerful oxidants than sulfate radicals. The complete removal of organic pollution from natural waters can be accomplished by direct chemical oxidation via hydroxyl radicals generated from photocatalytic decomposition of H2O2.
SponsorFunding: This research received no external funding. The publication of this article was funded by the Qatar National Library.
Languageen
PublisherMDPI AG
SubjectDegradation
Hydroxyl radicals
Mineralization
Photo-fenton
Sulfate radicals
Tannic acid
UV/persulfate
TitleOxidative degradation of tannic acid in aqueous solution by UV/S2O8 2- and UV/H2O2/Fe2+ processes: A comparative study
TypeArticle
Issue Number1
Volume Number9
dc.accessType Open Access


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