Enhanced peroxidase-like activity of MMT-supported cuprous oxide nanocomposites toward rapid colorimetric estimation of H2O2

Key Words:colorimetric; cuprous oxide; hydrogen peroxide; montmorillonite; peroxidase

Abstract:Nanocomposites based on Cu2O and Ca-montmorillonite (Ca+-MMT) with different composition were successfully prepared via a simple hydrothermal method. The as-prepared Cu2O-MMT nanocomposites can rapidly catalytically oxidize the colorless chromogenic substrate, 3,3 ',5,5 '-tetramethylbenzydine (TMB) into blue oxTMB with the aid of the H2O2 only in 30 s, which were observed by the naked eye. The reaction catalyzed by the Cu2O-MMT nanocomposites followed the Michaelis-Menten kinetics. Compared to the MMT or Cu2O alone, Cu2O-MMT with different mass ratio exhibited an enhanced peroxidase-like activity. The fabricated H2O2 sensor exhibited a good response to H2O2 with a linear detection range from 3 to 80 mu M as well as a detection limit of 2.395 mu M. Taking the advantages of the Cu2O-MMT nanocomposites, including outstanding peroxidase-like activity and high sensitivity for colorimetric detection of H2O2, a colorimetric sensor based on the Cu2O-MMT nanocomposites was designed and used to rapidly detect H2O2 in a short time.

Volume:33

Issue:2

Translation or Not:no