Active chlorine species electrogenerated on Ti/Ru0.3Ti0.7O2 surface: Electrochemical behavior, concentration determination and their application

Understanding active chlorine species production using boron doped diamond films with lower and higher sp3/sp2 ratio

“…(13) and (14) [9,16]. This explanation is supported by the low concentration of chlorate determined at both BDD anodes.…”

“…2. At BDD 1 anode, the polarization curve is shifted to less positive potentials while increasing the chloride concentration up to 5.0 g L −1 , due to the increase of the importance of the Cl 2 /H 2 O system [16]. At these polarization levels, hydroxyl radicals are in co-existence with the active chlorine species.…”

“…In the case of 50 and 75 mA cm − 2 , the pH passes from 7.5 to 9.45 after 45 min. It suggests production of hypochlorite by reductive process of ClO 2 − (at Nernst layer (ClO 2 − + H + + e − → ClO − + OH ads ) resulting in an enrichment of ClO − in this region) [14,16], resulting in a lower production of ClO 2 − (Fig. 3).…”

“…In order to obtain information about the processes happening on these surfaces, it is important to characterize the anodic oxygen evolution reaction (o.e.r.) by electrochemical measurements (polarization curves), in acidic media (supporting electrolyte typically used) and in absence and presence of Cl − in solution (electrolyte solution in this work) [16]. In the first case, Fig.…”

Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

“…The results point out the high performance Pt/Ti anodic oxidation for treating wastewater effluent compared to BDD anode. Although, the use of NaCl favors the production of strong oxidant species that together to ROS (such as, hydroxyl radicals) oxidize dissolved organic matter in real effluent (close to anode surface and in the reaction cage) [28][29][30]; particular attention and experimental observations must be taken into consideration before or during its use due to the production of organochloride compounds (pollutants were not detected after electrolysis). Finally, the results reported in the present work have recently allowed to start the design and implementation of a pilot electrochemical cell in the treatment station at the UFRN.…”