Anodic oxidation of aspirin on PbO 2 , BDD and porous Ti/BDD electrodes: Mechanism, kinetics and utilization rate

He, Yapeng; Huang, Weimin; Chen, Rongling; Zhang, Wenli; Lin, Haibo; Li, Hongdong

doi:10.1016/j.seppur.2015.09.036

Cited by 78 publications

(19 citation statements)

References 44 publications

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“…The low-pressure conversion of carbon to diamond crystals has allowed a thin layer of diamond film to develop on suitable substrates like silicon, niobium, tungsten, molybdenum, and titanium [78]. He et al [79] examined aspirin degradation with PbO 2 , BDD, and porous Ti/BDD as the anode. On BDD electrodes, the electrochemical process involves direct and indirect electrochemical oxidation, whereas, on the PbO 2 electrode, only indirect oxidation.…”

Section: Boron-doped Diamondmentioning

confidence: 99%

Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems

Dao

Yang

Chen

et al. 2020

Water

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Due to various potential toxicological threats to living organisms even at low concentrations, pharmaceuticals and personal care products in natural water are seen as an emerging environmental issue. The low efficiency of removal of pharmaceuticals and personal care products by conventional wastewater treatment plants calls for more efficient technology. Research on advanced oxidation processes has recently become a hot topic as it has been shown that these technologies can effectively oxidize most organic contaminants to inorganic carbon through mineralization. Among the advanced oxidation processes, the electrochemical advanced oxidation processes and, in general, electrochemical oxidation or anodic oxidation have shown good prospects at the lab-scale for the elimination of contamination caused by the presence of residual pharmaceuticals and personal care products in aqueous systems. This paper reviewed the effectiveness of electrochemical oxidation in removing pharmaceuticals and personal care products from liquid solutions, alone or in combination with other treatment processes, in the last 10 years. Reactor designs and configurations, electrode materials, operational factors (initial concentration, supporting electrolytes, current density, temperature, pH, stirring rate, electrode spacing, and fluid velocity) were also investigated.

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Section: Boron-doped Diamondmentioning

confidence: 99%

Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems

Dao

Yang

Chen

et al. 2020

Water

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“…also contributes to the mineralization process of organic matter. The differences observed between electrolytes may be mainly related to the formation of different oxidant species and differences can be explained in terms of their different properties (in particular, their oxidation capability) [39,40]. Likewise, UV light irradiation seems to have a significant effect on the mineralization process, this outcome becomes more important when working at higher current densities.…”

Section: Synergy Coefficientmentioning

confidence: 99%

Use of conductive diamond photo-electrochemical oxidation for the removal of pesticide glyphosate

Rubí-Juárez

Cotillas

Sáez

et al. 2016

Separation and Purification Technology

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In this work, the depletion of a commercial formulation of the pesticide glyphosate (RoundUp) using photolysis, electrolysis and photo-electrolysis with diamond anodes was studied. Results show that single photolysis is an inefficient technology for the removal of the pesticide; however, when coupled with electrolysis the removal yield significantly improves. The use of a combined process (photo-electrolysis) leads to the generation of higher concentrations of free radicals from the photo-activation of the oxidants electrogenerated. A major finding is that the supporting electrolyte plays a key role on the removal of glyphosate due to the generation of different oxidant species. Such species (peroxocarbonates, peroxosulfates and hypochlorite) also contribute to the depletion of the pesticide. Furthermore, the removal of glyphosate is clearly influenced by the current density because of the strong relationship between this parameter and the oxidants produced on the anode surface.

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“…Among the methods available to treat contaminated water, electrochemical technology has been used to remove various kinds of organic compounds, such as dyes [6][7][8][9][10][11][12], pharmaceuticals [12][13][14][15][16][17][18][19], pesticides [1,12,[20][21][22][23], or plasticizers [24][25][26]. High levels of energy consumption and low current efficiencies can be the main possible drawbacks of this technology; however, if an adequate choice of hydrodynamic conditions, applied current density, and anode material is made, high removal degrees can be attained at relatively low energy expenses.…”

Section: Introductionmentioning

confidence: 99%

Comparative electrochemical degradation of the herbicide tebuthiuron using a flow cell with a boron-doped diamond anode and identifying degradation intermediates

Pereira

Silva²,

Oliveira

et al. 2017

Electrochimica Acta

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The electrochemical degradation of tebuthiuron (TBH; 100 mg L À1) was carried out under enhanced mass transport conditions (using a flow cell with a BDD anode), while investigating the effect of solution pH, absence and presence of Cl À ions in the supporting electrolyte solution (0.1 mol L À1 Na 2 SO 4), and current density (j = 10, 30, 50 mA cm À2) on the herbicide degradation and resulting oxidation intermediates. The enhanced mass transport conditions led to significantly improved performances, comparatively to previous results obtained with a common electrochemical cell. The solution pH or presence of Cl À ions did not affect the TBH removal rate. However, the COD removal rate, despite being independent of pH, was significantly faster in the presence of Cl À ions, most probably due to false results caused by organochlorinated intermediates. In the absence of Cl À ions in solution, the TBH removal rate increased with j, whereas the COD removal rate was not affected, but significantly increased removal rates were attained in the presence of Cl À ions, most probably because of increased formation of organochlorines. As expected, higher values of the general and mineralization current efficiencies as well as lower energy consumptions per unit TOC mass removed (EC TOC) were attained at 10 mA cm À2 ; in the absence of Cl À ions, complete removal of TBH and 80% removal of TOC were attained with EC TOC = 0.2 kW h g À1 (less than 1/10 of those for electrolyses using a conventional electrochemical cell). From the identified intermediates, an initial TBH oxidation pathway like those of coupled processes involving photochemistry is expected. Most carboxylic acid intermediates were removed or being removed by the end of the electrolyses (except tartronic acid, which accumulated). As expected, organochlorinated intermediates were identified in the presence of Cl À ions, but were completely removed by the end of the electrolyses. In summary, the electrochemical degradation of TBH in the presence of Cl À ions is not advantageous; no significant improvement in the TBH and TOC removal rates, or in the energy expense, is achieved and the formation of organochlorines is a real possibility.

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Anodic oxidation of aspirin on PbO 2 , BDD and porous Ti/BDD electrodes: Mechanism, kinetics and utilization rate

Cited by 78 publications

References 44 publications

Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems

Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems

Use of conductive diamond photo-electrochemical oxidation for the removal of pesticide glyphosate

Comparative electrochemical degradation of the herbicide tebuthiuron using a flow cell with a boron-doped diamond anode and identifying degradation intermediates

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