Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV‐visible spectra

Abstract

In the present work, the generation mechanism of reactive oxygen species (ROS) on calcium peroxide (CaO 2 ) was studied. A very intense chemiluminescence (CL) signal was observed when adding an aqueous solution of luminol or 2-methyl-6-(4-methoxyphenyl)-3,7-dihydroimidazo[1,2α]-pyrazin-3-one hydrochloride (MCLA) to a suspension of CaO 2 . The ROS released on CaO 2 were thought to be oxidizing agents leading to CL, and were characterized by CL, UV-visible (UV-vis) spectra and the effective scavengers of the special ROS. ( 1 O 2 ) in the process. Obviously, the release of the ROS on CaO 2 is the main factor that contributed to the effect of CaO 2 , but the details have not been clarified and needed further research.Chemiluminescence (CL) is a powerful analytical technique that has excellent sensitivity, and a wide linear dynamic range and requires relatively simple and inexpensive instrumentation. Furthermore, CL is an effective method in research on ROS, because of the associated instantaneous nature of CL and the short lifetime of ROS radicals (11-16). Goto et al. (17) successfully investigated the CL mechanism of the alkalineearth metal peroxides (MgO 2 , BaO 2 ) with CL reagents (luminol and lucigenin), and demonstrated that the hydroxyl ( • OH) and • O 2 − were released chiefly on the MgO 2 and BaO 2 , respectively, with CL. According to our literature search, corresponding reports about CaO 2 have not so far been made.

Performance of α-methylnaphthalene degradation by dual oxidant of persulfate/calcium peroxide: Implication for ISCO

“…Liang et al also reported the similar scavenger results caused by the heterogeneous catalyst happened on copper oxidate surface in the PS/copper oxidate system [50]. CP could readily redox through obtaining a single electron in the suspension of alkaline earth metal peroxides to offer Å OH [51]. Compared to MeOH, TBA was easier to react with the radicals close to the surface of CP due to its relatively low solubility.…”

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

“…Besides its stable oxidation capability, CaO 2 also possesses the capacities of bleaching, disinfection, and deodorizing. Hence, CaO 2 has been widely used in agriculture, aquiculture, and medicine (Ma et al, 2007). CaO 2 can be used to promote organic pollutant degradation in contaminated soil due to its oxidation (Ndjou'ou and Cassidy, 2006).…”

Properties of calcium peroxide for release of hydrogen peroxide and oxygen: A kinetics study

“…2 Furthermore, a few of predecessors indicates that some of the H 2 O 2 produced can rapidly react on the surface of CaO 2 , forming free radicals (hydroxyl radical and superoxide) [36]. These unstable species can immediately react and form O 2 .…”