Vermiculite as heterogeneous catalyst in electrochemical Fenton-based processes: Application to the oxidation of Ponceau SS dye

Modified sodium vermiculite, an iron-rich clay mineral, has been used in novel heterogeneous electrochemical Fenton-based treatments, so-called electro-Fenton (EF)-vermiculite, UVA photoelectro-Fenton (PEF)-vermiculite and solar photoelectro-Fenton (SPEF)-vermiculite. Tests were made with 130 mL of...

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Published in:Chemosphere (Oxford) 2020-02, Vol.240, p.124838-124838, Article 124838
Main Authors: dos Santos, Alexsandro Jhones, Sirés, Ignasi, Alves, Ana P.M., Martínez-Huitle, Carlos A., Brillas, Enric
Format: Article
Language:English
Subjects:
Aluminum Silicates - chemistry
Azo Compounds - chemistry
Catalysis
Electrochemical Techniques - methods
Heterogeneous electro-Fenton
Heterogeneous Fenton
Heterogeneous photoelectro-Fenton
Mineral catalyst
Ponceau SS
Water treatment
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creator dos Santos, Alexsandro Jhones
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description Modified sodium vermiculite, an iron-rich clay mineral, has been used in novel heterogeneous electrochemical Fenton-based treatments, so-called electro-Fenton (EF)-vermiculite, UVA photoelectro-Fenton (PEF)-vermiculite and solar photoelectro-Fenton (SPEF)-vermiculite. Tests were made with 130 mL of 0.150 mM Ponceau SS diazo dye in 0.050 M Na2SO4 at pH 3.0, in the presence of 1.0 g L−1 catalyst microparticles. The electrolyses were performed in an undivided cell with a boron-doped diamond anode (BDD) and air-diffusion cathode for H2O2 production, at 33.3 mA cm−2. Decolorization and mineralization were upgraded in the sequence: EF-vermiculite 
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Tests were made with 130 mL of 0.150 mM Ponceau SS diazo dye in 0.050 M Na2SO4 at pH 3.0, in the presence of 1.0 g L−1 catalyst microparticles. The electrolyses were performed in an undivided cell with a boron-doped diamond anode (BDD) and air-diffusion cathode for H2O2 production, at 33.3 mA cm−2. Decolorization and mineralization were upgraded in the sequence: EF-vermiculite &lt; PEF-vermiculite &lt; SPEF-vermiculite. The removal of organics occurred by the combined action of OH oxidant formed at the BDD surface and homogeneous and heterogeneous Fenton's reactions, along with the photolysis caused by UVA light or sunlight. The homogeneous Fenton's reaction resulted from iron ions leaching, but the heterogeneous mechanism was prevalent. Comparative treatments by anodic oxidation in the presence of H2O2 and homogeneous EF were less effective than EF-vermiculite. The diazo dye absorbance decays agreed with a pseudo-first-order kinetics. SPEF-vermiculite was the most powerful process, yielding total decolorization and 84.1% mineralization after 300 and 360 min, respectively. The influence of catalyst concentration, current density and diazo dye content on PEF-vermiculite performance was examined. Oxalic, oxamic, malic, tartronic and acetic acids were detected as final short-linear carboxylic acids. •Sodium vermiculite as catalyst in heterogeneous EAOPs for Ponceau SS removal.•Low iron leaching from catalyst microparticles at pH 3.0: homogeneous catalysis.•OH formed by heterogeneous Fenton's reaction prevailed over homogeneous degradation.•Greater oxidation power: EF-vermiculite &lt; PEF-vermiculite &lt; SPEF-vermiculite.•Oxalic, oxamic, malic, tartronic and acetic acids detected as final carboxylic acids.</description><identifier>ISSN: 0045-6535</identifier><identifier>EISSN: 1879-1298</identifier><identifier>DOI: 10.1016/j.chemosphere.2019.124838</identifier><identifier>PMID: 31542582</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject>Aluminum Silicates - chemistry ; Azo Compounds - chemistry ; Catalysis ; Electrochemical Techniques - methods ; Heterogeneous electro-Fenton ; Heterogeneous Fenton ; Heterogeneous photoelectro-Fenton ; Mineral catalyst ; Ponceau SS ; Water treatment</subject><ispartof>Chemosphere (Oxford), 2020-02, Vol.240, p.124838-124838, Article 124838</ispartof><rights>2019 Elsevier Ltd</rights><rights>Copyright © 2019 Elsevier Ltd. 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Tests were made with 130 mL of 0.150 mM Ponceau SS diazo dye in 0.050 M Na2SO4 at pH 3.0, in the presence of 1.0 g L−1 catalyst microparticles. The electrolyses were performed in an undivided cell with a boron-doped diamond anode (BDD) and air-diffusion cathode for H2O2 production, at 33.3 mA cm−2. Decolorization and mineralization were upgraded in the sequence: EF-vermiculite &lt; PEF-vermiculite &lt; SPEF-vermiculite. The removal of organics occurred by the combined action of OH oxidant formed at the BDD surface and homogeneous and heterogeneous Fenton's reactions, along with the photolysis caused by UVA light or sunlight. The homogeneous Fenton's reaction resulted from iron ions leaching, but the heterogeneous mechanism was prevalent. Comparative treatments by anodic oxidation in the presence of H2O2 and homogeneous EF were less effective than EF-vermiculite. The diazo dye absorbance decays agreed with a pseudo-first-order kinetics. SPEF-vermiculite was the most powerful process, yielding total decolorization and 84.1% mineralization after 300 and 360 min, respectively. The influence of catalyst concentration, current density and diazo dye content on PEF-vermiculite performance was examined. 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subjects Aluminum Silicates - chemistry
Azo Compounds - chemistry
Catalysis
Electrochemical Techniques - methods
Heterogeneous electro-Fenton
Heterogeneous Fenton
Heterogeneous photoelectro-Fenton
Mineral catalyst
Ponceau SS
Water treatment
title Vermiculite as heterogeneous catalyst in electrochemical Fenton-based processes: Application to the oxidation of Ponceau SS dye
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