oaioai:bibliotecadigital.ipb.pt:10198/15377

Hybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidation of the liquid effluent from a mechanical biological treatment plant for municipal solid waste

Abstract

Magnetite, 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 (BOD 5 ) to COD ratio (BOD 5 /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.This work was financially supported by: Project POCI-01-0145-FEDER-006984 – Associate Laboratory LSRE-LCM funded by FEDERthrough COMPETE2020 − Programa Operacional Competitividadee Internacionalizac¸ ão (POCI) − and by national funds throughFCT − Fundação para a Ciência e a Tecnologia; Project VALOR-COMP, funded by FEDER through Programme INTERREG V-A Spain− Portugal (POCTEP) 2014–2020. R.S. Ribeiro and R.O. Rodrigues acknowledge the FCT individual Ph.D. grants SFRH/BD/94177/2013 and SFRH/BD/97658/2013, respectively, with financing from FCT and the European Social Fund (through POPH and QREN). A.M.T. Silva acknowledges the FCT Investigator 2013 Programme (IF/01501/2013), with financing from the European Social Fund and the Human Potential Operational Programme.AcknowledgmentsThis work was financially supported by: Project POCI-01-0145-FEDER-006984 – Associate Laboratory LSRE-LCM funded by FEDERthrough COMPETE2020 − Programa Operacional Competitividadee Internacionalizac¸ ão (POCI) − and by national funds throughFCT − Fundac¸ ão para a Ciência e a Tecnologia; Project VALOR-COMP, funded by FEDER through Programme INTERREG V-A Spain− Portugal (POCTEP) 2014–2020. R.S. Ribeiro and R.O. Rodriguesacknowledge the FCT individual Ph.D. grants SFRH/BD/94177/2013 and SFRH/BD/97658/2013, respectively, with financing from FCTand the European Social Fund (through POPH and QREN).A.M.T. Silva acknowledges the FCT Investigator 2013 Programme(IF/01501/2013), with financing from the European Social Fund andthe Human Potential Operational Programme.info:eu-repo/semantics/publishedVersio

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oaioai:bibliotecadigital.ipb.pt:10198/15377Last time updated on 3/23/2018

This paper was published in Biblioteca Digital do IPB.

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