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Title: Removal of tyrosol from water by adsorption on carbonaceous materials and electrochemical advanced oxidation processes
Author: Flores Tapia, Nelly Esther
Sharif, Farbod
Yasri, Nael
Brillas, Enric
Sirés Sadornil, Ignacio
Roberts, Edward P.L.
Keywords: Adsorció
Oli d'oliva
Depuració d'aigües residuals
Oxidació electroquímica
Olive oil
Purification of sewage
Electrolytic oxidation
Issue Date: 7-Mar-2018
Publisher: Elsevier Ltd
Abstract: This work compares the ability of physical and chemical treatments, namely adsorption and electrochemical advanced oxidation processes, to remove tyrosol from aqueous medium. Adsorption on graphene nanoplatelets (GNPs) performed much better than a graphite intercalation compound. Adsorption isotherm fit with Freundlich model (R2 = 0.96), which is characteristic of a chemisorption process. Successful electrochemical regeneration enables 5 successive adsorption/regeneration cycles before corrosion of GNPs occurs. Other typical aromatic contaminants that may coexist with tyrosol can be also adsorbed on GNPs. Percentage of regeneration efficiency of GNPs showed a higher affinity towards Lewis acids group compounds and a lower one towards Lewis base. The treatment of 100 mL of 0.723 mM tyrosol solutions in non-chlorinated and chlorinated matrices at pH 3.0 was carried out by electrochemical oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and UVA photoelectro-Fenton (PEF). Trials were made with a BDD anode and an air-diffusion cathode at 10-30 mA cm-2. Hydroxyl radicals formed at the anode from water oxidation and/or in the bulk from Fenton's reaction between added Fe2+ and generated H2O2, along with active chlorine produced in chlorinated medium, were the main oxidants. Tyrosol concentration always decayed following a pseudo-first-order kinetics and its mineralization rose as EO-H2O2 < EF < PEF, more rapidly in the chlorinated matrix. The potent photolysis of intermediates under UVA radiation explained the almost total mineralization achieved by PEF in the latter medium. The effect of current density and tyrosol content on the performance of all processes was examined.
Note: Versió postprint del document publicat a:
It is part of: Chemosphere, 2018, vol. 201, p. 807-815
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ISSN: 0045-6535
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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