Electro-oxidation of methyl paraben on DSA®-Cl2: UV irradiation, mechanistic aspects and energy consumption

Improving the degradation of low concentration of microcystin-LR with PEM electrolyzers and photo-electrolyzers

“…The existence of two slopes in electrochemical and photochemical degradations in discontinuous mode has been associated in the literature (Dionisio et al, 2020) to a change in the oxidation mechanisms. In this case, because of the extremely low concentration of organics, oxidants are expected to explain this change.…”

Paraben Compounds—Part II: An Overview of Advanced Oxidation Processes for Their Degradation

“…UVC photolysis was also tested, but only 17% of MP was removed in 120 min. In the studies by Dionisio et al [111,113], the presence of radiation was not able to increase the electrochemical experiments' efficiency, but when compared to single radiation, the high performance of the electrochemical route was noticed [113]. Steter et al [112] used BDD as an anode and 0.05 mol/L of K 2 SO 4 as an electrolyte solution but only achieved 34.65% of MP removal in 20 min for the best conditions.…”

“…Dionisio et al [111], Steter et al [112], and Dionisio et al [113] removed 100 mg/L of methylparaben using electrochemical oxidation with BDD [111,112] and DSA-Cl 2 [113]. Dionisio et al [111] had 100% removal in 20 min for electrochemical oxidation and photoelectrocatalysis with UVC radiation, while photochemical degradation led to 20% removal in almost 500 min reaction.…”

“…Moreover, it seems that NaCl presents a good behavior for these experiments. Dionisio et al [113] used 0.15 mol/L of NaCl as electrolyte solution, which also had 100% MP removal, but it was obtained in 40 min for electrocatalysis and photoelectrocatalysis, which did not show improvement when UVC radiation was added to the degradation process. UVC photolysis was also tested, but only 17% of MP was removed in 120 min.…”

High chlorine evolution performance of electrochemically reduced TiO2 nanotube array coated with a thin RuO2 layer by the self-synthetic method

“…A dimensionally stable anode (DSA; RuO 2 , IrO 2 , etc.) has an excellent electrochemical property for chlorine evolution reaction (ClER), 5,14,[20][21][22][23][24][25][26][27] but, one obstacle in the effective use of DSA is the high manufacturing cost based on the inclusion of expensive noble metals.…”