Advanced oxidation treatment of malachite green dye using a low cost carbon-felt air-diffusion cathode

Electrochemical advanced oxidation processes (EAOPs) as alternative treatment techniques for carwash wastewater reclamation

“…(4)) at the cathode from the Fe 3þ formed in Fenton's reaction (Eq. (2)) (Sir es and Brillas, 2012;Solano et al, 2015;Bañuelos et al, 2016;Lin et al, 2017;Ganiyu et al, 2018).…”

“…Among the anode materials currently in existence, boron doped diamond (BDD) thin film electrodes are the best anode materials known for electrochemical wastewater treatment because of its ability to generate large quantities of weakly adsorbed BDD ( OH). As a "non-active" anode, BDD can achieve complete destruction of organic pollutants (electrochemical combustion) (Panizza and Cerisola, 2009;Ruiz et al, 2011;Chaplin, 2014;Bañuelos et al, 2016;Morales et al, 2018). In contrast, when "active" anodes such as Pt, IrO 2 or RuO 2 are used, the produced M( OH) are further oxidized to chemisorbed oxygen or superoxide species, which are weak oxidants that could only achieve degradation (electrochemical conversion) with rare mineralization of the organic pollutants (Cañizares et al, 2002;Cavalcanti et al, 2013;Sopaj et al, 2015;Dur an et al, 2018).…”

A comparison investigation on photocatalytic activity performance and adsorption efficiency for the removal of cationic dye: Quantum dots vs. magnetic nanoparticles

“…Some of the methods for removal of pollutants from wastewater are adsorption [7] membrane separation [8], catalytic ozonation [9], Fenton [10], electro-Fenton [11], advanced oxidation process [12,13], electrochemical degradation [14], photocatalytic degradation [15][16][17] biodegradation [18], and ultrasonic irradiation [19]. These methods have their own advantages and disadvantages.…”

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

“…The figure shows that the higher the electrode potential, the higher hydrogen peroxide concentration. The steady-state of hydrogen peroxide concentration in solution is a common behaviour widely reported in literature for electrolytic cells[19,49,50], as a consequence of the equilibrium between the electrogeneration rate of hydrogen peroxide at the cathode [reaction (3)] and its oxidation reaction rate at the anode to produce O2 gas [reactions(5,6)]. In addition, the anodic oxidation of water would provide dissolved oxygen through the following reactions: H2O2  HO2  + H + + e -…”

“…in solution may partially help the degradation of organic dyes as the radical is more powerful oxidant[49,[51][52][53]. The hydrogen peroxide monitored inFigure 3corresponds to the hydrogen peroxide concentration which did not react with Fe 2+ ions to produce the powerful hydroxyl radical oxidant following reaction(1).…”