Electro-oxidative decolorization and treatment of model wastewater containing Acid Blue 80 on boron doped diamond and platinum anodes

Decolorization and Oxidation of Acid Blue 80 in Homogeneous and Heterogeneous Phases by Selected AOP Processes

“…From the kinetic experiments of the decolorization of AB80 dye solutions, we obtained time dependences of absorbance from which current concentrations of AB80 were calculated as a function of time using the calibration line equation A 627 = 0.148c AB80 + 0.091, r 2 = 0.998, see Ref. [12]. Even though we also tried to apply zero-and second-order kinetic equations, in line with a number of analogous studies [40][41][42][43][44] and our assumptions, the first-order speed constants proved best to describe the acquired dependences.…”

“…Our kinetic study builds on our previous paper [12] in which we compared the indirect electrochemical oxidation of Acid Blue 80 (AB 80) on active Pt and non-active BDD anodes and proposed a reaction mechanism for the degradation of this dye using • OH in the presence and absence of chloride ions. Again, we used AB80 and performed kinetic experiments monitoring the decolorization rate, i.e., the degradation of dye chromophore and the subsequent partial/total mineralization of intermediate products in homogeneous and heterogeneous phases [4,13] at comparable concentrations of AB80 and within the same range of pH 3-11. In general, it can be stated that hydroxyl radicals can be generated both by using a combination of more primary oxidants (e.g., ozone, hydrogen peroxide, oxygen), and also by using a DC power supply and passive electrodes, e.g., BDD electrodes and/or solar energy sources (e.g., ultraviolet light) and catalysts (e.g., titanium white).…”

Optimization of the electrochemical oxidation of textile wastewater by graphite electrodes by response surface methodology and artificial neural network

“…The material of the anode can influence the electrochemical mechanism and the produced material (Särkkä et al 2015). Lead and lead oxide (Awad & Abo Galwa 2005), boron-doped diamond (Koparal et al 2007;Zhu et al 2018;Kuchtová et al 2020), dimensionally stable anode (DSA) (Tavares et al 2012;Zhang et al 2012), and activated carbon cloth (ACC) (Cukierman 2013) electrodes were used as a base for the electrode in the EO process. Graphite electrodes had the attention of the researchers because of their low cost, low resistivity, chemical inertness and good conductivity (Kariyajjanavar et al 2013a(Kariyajjanavar et al , 2013b.…”

Improved electrochemical oxidative degradation of Reactive Red 24 dye by BDD anodes coupled with nitrate: operating parameters, kinetics, and degradation pathways

“…This is because the BDD electrode has incomparable advantages over other electrodes (graphite, Pt, and DSA), such as wide electrochemical window, corrosion resistance, low adsorption, and it can produce a large number of •OH that indirectly oxidate azo dyes instead of releasing oxygen (reactions (1)-( 3)) (Wang et al, 2000;Panakoulias et al, 2010;Wachter et al, 2015;Soni et al, 2017). Previous research has shown that the BDD electrode's influence on the •OH of an electrocatalytic system depends on the operating parameters, such as current density, supporting electrolyte and concentration, solution pH, temperature, and pollutant concentration (Kuchtova et al, 2020). However, to improve the degradation efficiency of single electrochemical oxidation (EO), high current density and extended electrolysis time are usually adopted, which limiting its promotion and application in the industry, as shown in Table 1.…”