Bernardes, Andrea Moura

Heberle, Alan Nelson Arenhart

Pérez Herranz, Valentín

Silva, Salatiel Wohlmuth da

Lume 5.8

Influence of a Cationic Membrane in a Double Compartment Filter-PressReactor on the Atenolol Electro-OxidationAuthors : Alan N. A. Heberle, Salatiel W. Da Silva, Valentin Perez-Herranz, Andrea M. BernardesAbstract  :  Contaminants  of  emerging  concern  are  substances  widely  used,  such  as  pharmaceutical  products.  Thesecompounds  represent  risk  for  both  wild  and  human  life  since  they  are  not  completely  removed  from wastewater  byconventional wastewater treatment plants. In the environment, they can be harm even in low concentration (µ or ng/L), causingbacterial resistance, endocrine disruption, cancer, among other harmful effects. One of the most common taken medicine totreat cardiocirculatory diseases is the Atenolol (ATL), a β-Blocker, which is toxic to aquatic life. In this way, it is necessary toimplement a methodology, which is capable to promote the degradation of the ATL, to avoid the environmental detriment. Avery  promising  technology  is  the  advanced  electrochemical  oxidation  (AEO),  which  mechanisms  are  based  on  theelectrogeneration of reactive radicals (mediated oxidation) and/or on the direct substance discharge by electron transfer fromcontaminant  to  electrode surface (direct  oxidation).  The hydroxyl  (HO•) and sulfate (SO₄•⁻)  radicals  can be generated,depending on the reactional medium. Besides that, at some condition, the peroxydisulfate (S₂O₈²⁻) ion is also generated fromthe SO₄• reaction in pairs. Both radicals, ion, and the direct contaminant discharge can break down the molecule, resulting inthe degradation and/or mineralization. However, ATL molecule and byproducts can still remain in the treated solution. On thiswise, some efforts can be done to implement the AEO process, being one of them the use of a cationic membrane to separatethe cathodic (reduction) from the anodic (oxidation) reactor compartment. The aim of this study is investigate the influence ofthe implementation of a cationic membrane (Nafion®-117) to separate both cathodic and anodic, AEO reactor compartments.The studied reactor was a filter-press, with bath recirculation mode, flow 60 L/h. The anode was an Nb/BDD2500 and thecathode a stainless steel, both bidimensional, geometric surface area 100 cm². The solution feeding the anodic compartmentwas prepared with ATL 100 mg/L using Na₂SO₄ 4 g/L as support electrolyte. In the cathodic compartment, it was used asolution containing Na₂SO₄ 71 g/L. Between both solutions was placed the membrane. The applied currents densities (iₐₚₚ) of5, 20 and 40 mA/cm² were studied over 240 minutes treatment time. Besides that, the ATL decay was analyzed by ultravioletspectroscopy (UV/Vis). The mineralization was determined performing total organic carbon (TOC) in TOC-L CPH Shimadzu. Inthe cases without membrane, the iₐₚₚ 5, 20 and 40 mA/cm² resulted in 55, 87 and 98 % ATL degradation at the end oftreatment time, respectively. However, with membrane, the degradation, for the same iₐₚₚ, was 90, 100 and 100 %, spending240, 120, 40 min for the maximum degradation, respectively. The mineralization, without membrane, for the same studied iₐₚₚ,was 40, 55 and 72 %, respectively at 240 min, but with membrane, all tested iₐₚₚ reached 80 % of mineralization, differing onlyin the time spent, 240, 150 and 120 min, for the maximum mineralization, respectively. The membrane increased the ATLoxidation, probably due to avoid oxidant ions (S₂O₈²⁻) reduction on the cathode surface.Keywords : contaminants of emerging concern, advanced electrochemical oxidation, atenolol, cationic membrane, doublecompartment reactorConference Title : ICDMT 2019 : International Conference on Desalination and Membrane TechnologyConference Location : Paris, FranceConference Dates : October 29-30, 2019  World Academy of Science, Engineering and TechnologyInternational Journal of Chemical and Molecular EngineeringVol:13, No:10, 2019Open Science Index, Chemical and Molecular Engineering Vol:13, No:10, 2019 waset.org/abstracts/108048ISNI:0000000091950263International Scholarly and Scientific Research & Innovation 13(10) 2019 1

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Influence of a cationic membrane in a double compartment filter-press reactor on the atenolol electro-oxidation

Universidade Federal do Rio Grande do Sul

https://lume.ufrgs.br/bitstream/10183/213672/1/001116044.pdf

Influence of a cationic membrane in a double compartment filter-press reactor on the atenolol electro-oxidation

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Lume 5.8

Universidade Federal do Rio Grande do Sul