Carbon dots (CD) generated from biomass were fabricated on g-C 3 N 4 to construct a metal-free nanozyme with inherent peroxidase mimic functions. The formation of CD/g-C 3 N 4 was confirmed by different characterization techniques. The CD/g-C 3 N 4 displays distinct peroxidase mimic activities, as evidenced by the catalyzed oxidation of TMB (3,3',5,5', -tetramethylbenzidine) in the presence of H 2 O 2 , as well as color alteration from transparent to blue. The mechanistic analysis of peroxidase activity indicated that H 2 O 2 was catalyzed by CD/g-C 3 N 4 to produce reactive oxygen species. In an acidic solution, the presence of Cr (VI) accelerates the breakdown of H 2 O 2 to * OH radicals thereby increasing the rate of TMB oxidation. Hence, a visual colorimetric sensor was developed for the purpose of detecting Cr(VI) with limits of detection (LOD) 0.31 μM, based on the accelerated electron transfer between TMB and H 2 O 2 with the assistance of CD/g-C 3 N 4 .
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.