Catalytic activity of MOF(2Fe/Co)/carbon aerogel for improving H2O2 and  OH generation in solar photo–electro–Fenton process

A novel bifunctional MOF(2Fe/Co)/CA cathode with a high surface possessing area, and good electrocatalytic and photocatalytic activity, was proposed for the solar photo–electro–Fenton (SPEF) process. The optimal nFe: nCo ratio was 2:1 for successfully introducing MOF(2Fe/Co) on the surface of CA, which is due to the specific interaction affinity of FeOOH between MOF(2Fe/Co) and CA. Continuous on–site generation of H 2 O 2 through an oxygen reduction reaction (ORR) was achieved over the CA cathode. The electron transfer number (n) of the ORR with CA was 2.5 in the selected potential range. Moreover, the addition of MOF can behave as the active sites for enhancing the ORR activity and hence can increase the yield of the H 2 O 2 . Simultaneously, the photoinduced electron (e cb − ) of MOF(2Fe/Co) efficiently in–situ decomposed H 2 O 2 to form hydroxyl radicals ( OH). The observation indicated that the e cb − is an efficient and new Fenton–like catalysts that is pH–independent. Efficient photo–electro–catalytic performance was exhibited when applied to degrade Rhodamine B (RhB) and dimethyl phthalate (DMP). Almost 100% RhB removal and 85% DMP removal were reached in 45   min and 120   min, respectively. The MOF(Fe/Co)/CA presented very low iron and cobalt leaching (<0.5   ppm) even in an acidic media, and it retained an efficient degradation efficiency in the wide pH range of 3–9.