Electrochemical degradation of tricyclazole in aqueous solution using Ti/SnO2–Sb/PbO2 anode

Zhong, Congqiang; Wei, Kajia; Han, Weiqing; Wang, Lianjun; Sun, Xiuyun; Li, Jiansheng

doi:10.1016/j.jelechem.2013.07.027

Cited by 56 publications

(18 citation statements)

References 38 publications

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“…Applying a third outer layer of PbO2 increases the electrochemical stability of the SnO2-Sb electrode in high voltage; moreover, nano-PbO2 provides more surface sites for reactions [26,37]. Ideally, every electron that flows out of the anode should create one hydroxyl radicals if the band gap is large.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical oxidation of ofloxacin using a TiO2-based SnO2-Sb/polytetrafluoroethylene resin-PbO2 electrode: Reaction kinetics and mass transfer impact

Xie

Meng

Sun

et al. 2017

Applied Catalysis B: Environmental

224

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Electrochemical oxidation has been proposed for the destruction of organic contaminants; however, this process is hampered by low oxidation efficiency and high energy cost. Accordingly, we developed a TiO2-based SnO2-Sb/polytetrafluroethylene resin (FR)-PbO2 electrode that was based on TiO2 nanotubes. We tested the performance of the electrode on an antibiotic, ofloxacin, and identified the major pathway of ofloxacin oxidation. We found growing TiO2 nanotubes on Ti material increased current efficiency, and the electrical efficiency per order (EE/O, kWh/m 3) for oxidation was decreased by 16.2%. Our electrode requires a large overpotential before electrons flow, which minimizes oxygen evolution, reduces hydrogen peroxide and ozone generation, and favors hydroxyl radicals (HO•) production. We found the electron efficiency (EE) during oxidation was as high as 88.45%. In other words, 88.45% of the electrons that flow out of the electrode cause oxidation. The effects of current density, initial concentration, pH value and electrolyte concentration were investigated. A differential column batch reactor (DCBR) was used to simulate the performance of continuous plug flow reactor and we found that the destruction of ofloxacin followed pseudo-first order model. We also evaluated the impact of mass transfer on electrochemical performance. The effects of fluid velocity and electrode spacing on oxidation rate were evaluated by determining the mass transfer coefficient and the effectiveness factor Ω (between 0-1). Our experiments and calculations indicated that the mass transfer reduced oxidation rate by more than 55% (Ω<0.45) for an electrode spacing of 1 cm at a fluid velocity of 0.033 m/s. Unlike studies carried out using completely mixed batch reactor, the DCBR can simulate the flow conditions in pilot or full scale reactors; consequently, observed pseudo-first order rate constants in the DCBR can be used for preliminary design.

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Section: Introductionmentioning

confidence: 99%

Electrochemical oxidation of ofloxacin using a TiO2-based SnO2-Sb/polytetrafluoroethylene resin-PbO2 electrode: Reaction kinetics and mass transfer impact

Xie

Meng

Sun

et al. 2017

Applied Catalysis B: Environmental

224

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“…However, in the strong acidic solutions, the life of anode decreases [ 44 ]. As a result, in the present study, a pH of 2 was found as the optimum pH value for maximum PFOA mineralization.…”

Section: Resultsmentioning

confidence: 99%

Sonoelectrochemical mineralization of perfluorooctanoic acid using Ti/PbO 2 anode assessed by response surface methodology

Bonyadinejad

Khosravi

Ebrahimi

et al. 2015

J Environ Health Sci Engineer

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BackgroundPerfluorocarboxylic acids (PFCAs) are emerging pollutant and classified as fully fluorinated hydrocarbons containing a carboxylic group. PFCAs show intensively resistance against chemical and biological degradation due to their strong C–F bond. The Sonoelectrochemical mineralization of the synthetic aqueous solution of the perfluorooctanoic acid (PFOA) on Ti/PbO2 anode was investigated using the response surface methodology based on a central composite design with three variables: current density, pH, and supporting electrolyte concentration.MethodsThe defluorination ratio of PFOA was determined as an indicator of PFOA mineralization. Fluoride ion concentration was measured with an ion chromatograph unit. The Ti/PbO2 electrode was prepared using the electrochemical deposition method. The ultrasonic frequency was 20 kHz.ResultsThe optimum conditions for PFOA mineralization in synthetic solution were electrolyte concentration, pH, and current density of 94 mM, 2, and 83.64 mA/cm2, respectively. The results indicated that the most effective factor for PFOA mineralization was current density. Furthermore, the PFOA defluorination efficiency significantly enhanced with increasing current density. Under optimum conditions, the maximum mineralization of PFOA was 95.48 % after 90 min of sonoelectrolysis.ConclusionsSonoelectrolysis was found to be a more effective technique for mineralization of an environmentally persistent compound.

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“…In our study, when the initial concentration of EDTA increased, more substrates are transferred to the surface of electrode, the generation of reactive oxidative species (·OH) are limited [ 32 ], so excessive EDTA would decrease the degradation efficiency. Many authors have investigated the effect of initial pH on the electrochemical oxidation of pollutants in aqueous medium [ 30 , 33 ]. In this study, low pH was beneficial to degrade the EDTA.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Oxidation of EDTA in Nuclear Wastewater Using Platinum Supported on Activated Carbon Fibers

Zhao

Zhu

Tao

et al. 2017

IJERPH

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A novel Pt/ACF (Pt supported on activated carbon fibers) electrode was successfully prepared with impregnation and electrodeposition method. Characterization of the electrodes indicated that the Pt/ACF electrode had a larger effective area and more active sites. Electrochemical degradation of ethylenediaminetetra-acetic acid (EDTA) in aqueous solution with Pt/ACF electrodes was investigated. The results showed that the 3% Pt/ACF electrode had a better effect on EDTA removal. The operational parameters influencing the electrochemical degradation of EDTA with 3% Pt/ACF electrode were optimized and the optimal removal of EDTA and chemical oxygen demand (COD) were 94% and 60% after 100 min on condition of the electrolyte concentration, initial concentration of EDTA, current density and initial value of pH were 0.1 mol/L, 300 mg/L, 40 mA/cm2 and 5.0, respectively. The degradation intermediates of EDTA in electrochemical oxidation with 3% Pt/ACF electrode were identified by gas chromatography-mass spectrum (GC-MS).

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Electrochemical degradation of tricyclazole in aqueous solution using Ti/SnO2–Sb/PbO2 anode

Cited by 56 publications

References 38 publications

Electrochemical oxidation of ofloxacin using a TiO2-based SnO2-Sb/polytetrafluoroethylene resin-PbO2 electrode: Reaction kinetics and mass transfer impact

Electrochemical oxidation of ofloxacin using a TiO2-based SnO2-Sb/polytetrafluoroethylene resin-PbO2 electrode: Reaction kinetics and mass transfer impact

Sonoelectrochemical mineralization of perfluorooctanoic acid using Ti/PbO 2 anode assessed by response surface methodology

Electrochemical Oxidation of EDTA in Nuclear Wastewater Using Platinum Supported on Activated Carbon Fibers

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