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A dual TiO2/Ti-stainless steel anode for the degradation of orange G in a coupling photoelectrochemical and photo-electro-Fenton system
摘要： A dual-anode consists of stainless steel and TiO2/Ti electrodes is used to study the kinetics of the degradation of hazardous chemicals exemplified by azo dye orange G (OG) using a coupling photoelectrochemical catalytic and photoelectro-Fenton (PEC/PEF) system. Concurrent generation of hydroxyl radicals on the TiO2/Ti photocatalyst and in-situ generation of Fenton reagents on the stainless steel electrode greatly enhances the performance of the PEC/PEF electrodes over that of the PEC and the PEF alone process. The efficiency of the PEC/PEF process is a function of Fe2+ and H2O2 concentration OH? in the solution bulk, which promotes the oxidative degradation of OG and its byproducts. The mean carbon oxidation state (COS) is estimated to reflect the degree of mineralization. Based on the pseudo first-order kinetics with respect to OH?, OG, Fe2+, the corresponding reaction rates is established. UV–Vis spectrometry reveals the presence of four major intermediates, which helps establish the OG degradation pathways.
关键词： Photoelectrochemical catalytic oxidation,Orange G,Electro-Fenton,Photoelectro-Fenton,Electrochemical oxidation
更新于2025-09-23 15:23:52
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Assessment of 4-aminoantipyrine degradation and mineralization by photoelectro-Fenton with a BDD anode: Optimization, treatment in municipal secondary effluent, and toxicity
摘要： 4-Aminoantipyrine (4-AA), a persistent metabolite of dipyrone found in natural water, has been treated in 100 mL of aqueous 0.050 M Na2SO4 solutions at pH 3.0 by photoelectro-Fenton (PEF) with a 4 W UVA light. The assays were performed in a cell equipped with a BDD anode and an air-diffusion cathode for H2O2 generation. The formation of an unstable Fe(III)-4-AA complex with 1:2 molar ratio was evidenced. A 24 central composite design was used to assess the effect of four independent variables on PEF performance. The optimized conditions for 62.5 mg L-1 4-AA were: current density of 77.5 mA cm-2 and 47.75 mg L-1 Fe2+, yielding 99% 4-AA degradation at 7 min, and 45% 4-AA mineralization with 3.2% mineralization current efficiency at 130 min. Slightly slower degradation and similar mineralization were obtained under these conditions when 4-AA was spiked into a municipal secondary effluent, showing a low influence of natural organic matter on PEF. The initially high acute toxicity determined using Artemia salina was largely diminished upon PEF treatment.
关键词： 4-Aminoantipyrine,Response surface methodology,Photoelectro-Fenton,Municipal secondary effluent,Acute toxicity
更新于2025-09-23 15:23:52
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Enhanced electrocatalytic production of H2O2 at Co-based air-diffusion cathodes for the photoelectro-Fenton treatment of bronopol
摘要： (Co, S, P)-decorated multiwalled carbon nanotubes (MWCNTs) have been synthesized following a hydrothermal route as electrocatalysts to manufacture large surface area air-diffusion cathodes with carbon cloth as substrate. The enhanced electrocatalytic H2O2 production as compared with Co-free MWCNTs cathodes was demonstrated in a 2.5-L pre-pilot plant with either a RuO2-based or boron-doped diamond (BDD) anode, accumulating between 2- and 3-fold greater H2O2 contents with the catalyzed cathode. The good stability of this new material was ensured from the low Co leaching, with less than 9% Co released to solutions upon repeated usage. Aqueous solutions of the brominated organic preservative bronopol with 0.050 M Na2SO4 at pH 3.0 were comparatively treated by electro-oxidation (EO-H2O2), electro-Fenton (EF), UVA-assisted photoelectro-Fenton (PEF) and solar PEF (SPEF) at constant current density. SPEF with BDD anode and the catalyzed cathode showed the best performance, with total bronopol removal at 210 min and 94% mineralization after 360 min at 40 mA cm-2, thanks to the action of ?OH, BDD(?OH) and sunlight. Formic acid was identified as main reaction by-product, whereas Br and N atoms were mainly converted to Br-, BrO3- and NO3-. Some unidentified organic by-product containing Br and N was formed as well.
关键词： Photoelectro-Fenton process,Bronopol,H2O2 electrogeneration,Wastewater treatment,Pre-pilot plant
更新于2025-09-23 15:23:52
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FTO-TiO2 photoelectrocatalytic degradation of triphenyltin chloride coupled to photoelectro-Fenton: A mechanistic study
摘要： A powerful, simple and stable transparent photoanode based on TiO2 nanoparticles deposited on fluorine-doped tin oxide (FTO) was synthesized for the photoelectrocatalytic degradation of the organometallic pollutant triphenyltin chloride (TPTCl). Contrasting with most of the works on photoelectrocatalysis (PEC), FTO-TiO2 was found to be an excellent anode material for the degradation/mineralization of organic pollutants at high anodic potentials through the formation of electrochemically-induced hVB+ (dark PEC), showing a similar behavior as the so-called 'non-active' anodes like the powerful boron doped diamond electrode (BDD). The electrocatalytic efficiency was enhanced by the photoexcitation of TiO2 under UV light (PEC) and by coupling with photoelectro-Fenton (PEC-PEF): this resulted in complete degradation of TPTCl in 15 min (kapp = 0.274 min-1) and total mineralization in 2 h. The mechanisms governing the photoelectrocatalytic processes are investigated in detail by means of electrochemical measurements and chemical probes, and a mineralization pathway for TPTCl is proposed.
关键词： photoelectro-Fenton,photoelectrocatalysis,fluorine-doped tin oxide,organotin pollutants,Dark PEC
更新于2025-09-23 15:21:01