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      The Influence of Solution pH on the Kinetics of Resorcinol Electrooxidation (Degradation) on Polycrystalline Platinum

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          Abstract

          Electrochemical oxidation of resorcinol on a polycrystalline platinum electrode was investigated in five different solutions, namely 0.5 and 0.1 M H 2SO 4, 0.5 M Na 2SO 4, 0.5 and 0.1 M NaOH. The rates of electrochemical degradation of resorcinol were determined based on the obtained reaction parameters, such as resistance, capacitance and current-density. The electrochemical analyses (cyclic voltammetry and a.c. impedance spectroscopy) were carried-out by means of a three-compartment, Pyrex glass cell. These results showed that the electrochemical oxidation of resorcinol is strongly pH-dependent. In addition, the energy dispersive X-ray (EDX) spectroscopy technique was employed for Pt electrode surface characterization. Additionally, the quantitative determination of resorcinol removal was performed by means of instrumental high-performance liquid chromatography/mass spectrometry (HPLC/MS) methodology.

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          Electro-Fenton process and related electrochemical technologies based on Fenton's reaction chemistry.

          Enric Brillas, Ignasi Sirés, Mehmet A Oturan (2009)
          Article 0 comments Cited 484 times – based on 0 reviews     Review now
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            Characteristics and adsorption capacities of low-cost sorbents for wastewater treatment: A review

            Sabino De Gisi, Giusy Lofrano, Mariangela Grassi … (2016)
            Article 0 comments Cited 292 times – based on 0 reviews     Review now
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              The Haber-Weiss cycle--70 years later.

              W. Koppenol (2001)
              The chain reactions HO* + H2O2 --> H2O + O2*- + H+ and O2*- + H+ + H2O2 --> O2 + HO* + H2O, commonly known as the Haber-Weiss cycle, were first mentioned by Haber and Willstätter in 1931. George showed in 1947 that the second reaction is insignificant in comparison to the fast dismutation of superoxide, and this finding appears to have been accepted by Weiss in 1949. In 1970, the Haber-Weiss reaction was revived by Beauchamp and Fridovich to explain the toxicity of superoxide. During the 1970s various groups determined that the rate constant for this reaction is of the order of 1 M(-1) s(-1) or less, which confirmed George's conclusion. The reaction of superoxide with hydrogen peroxide was dropped from the scheme of oxygen toxicity, and superoxide became the source of hydrogen peroxide, which yields hydroxyl radicals via the Fenton reaction, Fe2+ + H2O2 --> Fe3+ + HO- + HO*. In 1994, Kahn and Kasha resurrected the Haber-Weiss reaction again, but this time the oxygen was believed to be in the singlet (1delta(g)) state. As toxicity arises not from a Fenton-catalysed Haber-Weiss reaction, but from the Fenton reaction, the Haber-Weiss reaction should not be mentioned anymore.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Molecules
                Journal ID (iso-abbrev): Molecules
                Journal ID (publisher-id): molecules
                Title: Molecules
                Publisher: MDPI
                ISSN (Electronic): 1420-3049
                Publication date (Electronic): 21 June 2019
                Publication date Collection: June 2019
                Volume: 24
                Issue: 12
                Electronic Location Identifier: 2309
                Affiliations
                [1 ]Department of Chemistry, Faculty of Environmental Management and Agriculture, University of Warmia and Mazury in Olsztyn, Plac Lodzki 4, 10-727 Olsztyn, Poland; mateusz.luba@ 123456uwm.edu.pl
                [2 ]Department of Rehabilitation, Faculty of Medical Sciences, University of Warmia and Mazury in Olsztyn, Zolnierska 14C Street, 10-561 Olsztyn, Poland; rehab@ 123456uwm.edu.pl
                [3 ]Institute of Animal Reproduction and Food Research, Polish Academy of Sciences in Olsztyn, Tuwima 10 Street, 10-748 Olsztyn, Poland; w.wiczkowski@ 123456pan.olsztyn.pl
                Author notes
                [* ]Correspondence: tomasz.mikolajczyk@ 123456uwm.edu.pl (T.M.); bogpierozynski@ 123456yahoo.ca or boguslaw.pierozynski@ 123456uwm.edu.pl (B.P.); Tel.: +48-89-523-4177 (B.P.); Fax: +48-89-523-4801 (B.P.)
                Author information
                https://orcid.org/0000-0003-0113-4804
                https://orcid.org/0000-0002-9412-3620
                https://orcid.org/0000-0001-6021-5589
                Article
                Publisher ID: molecules-24-02309
                DOI: 10.3390/molecules24122309
                PMC ID: 6631510
                PubMed ID: 31234459
                SO-VID: 72b50267-1ef1-45bd-8c48-0a1b6e982d6f
                Copyright © © 2019 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 31 May 2019
                Date accepted : 21 June 2019
                Categories
                Subject: Article

                Keywords: oxidation of resorcinol,a.c. impedance spectroscopy,energy dispersive x-ray spectroscopy,0.5 m h2so4,0.5 m na2so4,0.1 m naoh,0.1 m h2so4,0.5 m naoh
                Data availability:
                Keywords: oxidation of resorcinol, a.c. impedance spectroscopy, energy dispersive x-ray spectroscopy, 0.5 m h2so4, 0.5 m na2so4, 0.1 m naoh, 0.1 m h2so4, 0.5 m naoh

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