Nitrogen-containing wastewater fuel cells for total nitrogen removal and energy recovery based on Cl•/ClO• oxidation of ammonia nitrogen

In situ electrogenerated Cu(III) triggers hydroxyl radical production on the Cu-Sb-SnO 2 electrode for highly efficient water decontamination

“…The presence of refractory organic micropollutants such as antibiotics and pharmaceuticals in diverse water and wastewater resources poses a significant threat to ecosystem security and clean water supply ( 1 – 3 ). The electrochemical oxidation process (EOP) with the advantages of strong oxidation capacity, environmental friendliness, compact structure, rapid reaction kinetics and modular treatment mode is considered a very promising technology for treating refractory organic pollutants ( 4 – 6 ). Pollutants can be completely degraded by electron transfer on the anode surface (direct oxidation) or electrogenerated radical attack (indirect oxidation) in EOP ( 7 ).…”

Selective tandem electroreduction of nitrate to nitrogen via copper–cobalt based bimetallic hollow nanobox catalysts

“…25 However, in previous studies, Cl − was typically introduced to the electrolyte to oxidize the undesired NH 4 + to N 2 . 41,62 In the chlorine-containing system, Cl − was first converted to Cl 2 on the anodic surface (2Cl − → Cl 2 + 2e − ), and then the dissolved Cl 2 was converted to ClO − with strong oxidation in water (Cl 2 + H 2 O → HClO + Cl − + H + ). 7 In the presence of hypochlorite, non-electrochemical ammoxidation occurred (eqn ( 7)).…”

Combined effect of Cu0and oxygen vacancies in Cu-based zeolites enables highly efficient photo-Fenton-like performance for water purification

“…1,2 The Fenton process, as a common advanced oxidation process (AOP), has received extensive attention in the field of water treatment because of its advantage of producing strong oxidative hydroxyl radicals (·OH) through the reaction between Fe 2+ and H 2 O 2 . 3–5 However, the large-scale applications of the Fenton process are usually limited by slow Fe 3+ /Fe 2+ redox cycles and a narrow pH application range. 6,7 The Cu-based heterogeneous Fenton-like reaction has been considered as a good substitute for the conventional Fenton reaction in recent years because the reaction rate of H 2 O 2 with Cu( i ) is faster than that with Fe( ii ) over a wide pH range.…”