Oxygen Vacancies and Hydroxyl Radicals are Contributed in Catalytic Oxidation of 3,3′,5,5′-Tetramethylbenzidine Over NH2-MiL-88 (Fe, Ni) as the Main Reactive Oxygen Species
Abstract
Ali Reza Hormozi Jangi and Mohammad Reza Hormozi Jangi
Herein, the reactive oxygen species contributed in catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine over NH2 -MiL-88 (Fe, Ni) were identified by investigating the effect of different scavengers on the catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine. The possible contribution of Ovs, hydroxyl radicals, and 1 O2 in the catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine over NH2-MiL-88 (Fe, Ni) were investigated. The results revealed that oxygen vacancies (Ovs) and hydroxyl radicals are significantly contributed in nanozymatic reaction while by presence of 1O2, the catalytic oxidation reaction is not affected. Considering the results, hydrogen peroxide and 3,3′,5,5′-tetramethylbenzidine were adsorbed over the nanozymes and then the active metal center of the nanozymes affected on hydrogen peroxide to generate 0 OH or O2 -. Afterward, the oxidation of 3,3′,5,5′-tetramethylbenzidine to its corresponding colored product was occurred by the reactive oxygen species.