Abstract
Nanozymes as one of artificial enzymes show many advantages than natural enzymes. The high Michaelis-Menten constant (Km) to H2O2 is the drawback for nanozymes, which means a high H2O2 concentration to oxidize 3,3',5,5'-tetramethylbenzidine (TMB). For this problem, FeS2/SiO2 double mesoporous hollow spheres (DMHSs) were first synthesized as an artificial peroxidase through a solid reaction. The experimental results demonstrate that Fe3O4 vulcanization and DMHS formation were effective strategies to enhance affinity to H2O2 for the nanozyme. The Km of FeS2/SiO2 DMHSs (H2O2 as the substrate) is 18-fold smaller than that of FeS2 nanoparticles (NPs). The catalytic efficiency (Kcat/Km) of FeS2/SiO2 DMHSs is about 16 times higher than that of FeS2 NPs. FeS2/SiO2 DMHSs can be used as a nanozyme to sensitively and rapidly detect H2O2 and glutathione within 1 min at room temperature.
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