Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/117010
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dc.creatorRui S. Ribeiro
dc.creatorRaquel O. Rodrigues
dc.creatorAdrián M.T. Silva
dc.creatorPedro B. Tavares
dc.creatorAna M.C. Carvalho
dc.creatorJosé L. Figueiredo
dc.creatorJoaquim L. Faria
dc.creatorHelder T. Gomes
dc.date.accessioned2019-02-08T17:14:24Z-
dc.date.available2019-02-08T17:14:24Z-
dc.date.issued2017
dc.identifier.issn0926-3373
dc.identifier.othersigarra:299023
dc.identifier.urihttps://repositorio-aberto.up.pt/handle/10216/117010-
dc.description.abstractMagnetite, nickel and cobalt ferrites were prepared and encapsulated within graphitic shells, resulting in three hybrid magnetic graphitic nanocomposites. Screening experiments with a 4-nitrophenol aqueous model system (5 g L-1) allowed to select the best performing catalyst, which was object of additional studies with the liquid effluent resulting from a mechanical biological treatment plant for municipal solid waste. Due to its high content in bicarbonates (14350 mg L-1) and chlorides (2833 mg L-1), controlling the initial pH was a crucial step to maximize the performance of the catalytic wet peroxide oxidation (CWPO) treatment. The catalyst load was 0.5 g L-1, a very low dosage when compared to the high chemical oxygen demand (COD) of the effluent - 9206 mg L-1. At the optimum operating pH (i.e., pH = 6), ca. 95% of the aromaticity was converted and ca. 55% of COD and total organic carbon (TOC) of the liquid effluent was removed. The biodegradability of the liquid effluent was enhanced during the treatment by CWPO, as reflected by the 2-fold increase of the five-day biochemical oxygen demand (BOD5) to COD ratio (BOD5/COD), namely from 0.21 (indicating non-biodegradability) to 0.42 (suggesting biodegradability of the treated wastewater). In addition, the treated water revealed no toxicity against selected bacteria. Lastly, a magnetic separation system was designed for in-situ catalyst recovery after the CWPO reaction stage. The high catalyst stability was demonstrated through five reaction/separation sequential experiments in the same vessel with consecutive catalyst reuse.
dc.language.isoeng
dc.rightsrestrictedAccess
dc.titleHybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidation of the liquid effluent from a mechanical biological treatment plant for municipal solid waste
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.identifier.doi10.1016/j.apcatb.2017.08.013
dc.identifier.authenticusP-00M-XKZ
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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