Lianghai Xia,Lingdong Kong,Jie Tan,Yuwen Wang,Shengyan Jin,Chao Wang
BiOBr can degrade pollutants under visible light, and it is a new star in the field of photocatalysis. However, its practical application still faces great challenges, and it still needs to be designed and modified to obtain high catalytic performance for efficient degradation of organic pollutants. Herein, we have realized the simple preparation and efficient catalysis of a BiOBr composite catalyst. This catalyst combines the dual effects of stable adsorption and efficient degradation. This spherical catalyst is composed of surfactant PVP and BiOBr and has higher photocatalytic efficiency. It is found that PVP on the surface of BiOBr firmly adsorbs 2,4-dichlorophenol on the surface of the catalyst, and the petal like microsphere structure makes full use of light energy to achieve high-efficiency photocatalysis. The catalytic effect of the composite catalyst is 1.53 times higher than that of the pure BiOBr catalyst. This study will help us better understand the comprehensive effects of adsorption and degradation of surfactants and catalytic materials, and develop new and reliable green photocatalysts.
Polyvinylpyrrolidone (PVP)-modified MoS2 nanoparticles (PVP-MoS2 NPs) with d = 5 nm and in high purity and yield were prepared by a facile one-pot hydrothermal method. Cytotoxicity and hemolysis studies demonstrated that PVP-MoS2 NPs show good biocompatibility. The PVP-MoS2 NPs exhibited remarkable peroxidase-like catalytic activity, which was similar to that of horseradish peroxidase (HRP). Based on this peroxidase-like activity, a platform for colorimetric detection of H2O2 was established. We have found that these NPs have high sensitivity to detect H2O2 with a nearly linear range between 2.0 × 10−6 mol L−1 and 1.5 × 10−4 mol L−1. Furthermore, the PVP-MoS2 NPs were also used for glucose measurement in serum by quantifying the released H2O2 in the presence of glucose oxidase. The linear range for glucose detection was from 1.0 × 10−3 mol L−1 to 1.0 × 10−2 mol L−1. This work will pave a way for the high-throughput synthesis of other ultra-small transition metal dichalcogenide (TMDs) NPs. Such enzyme-mimic nanomaterials could be a useful tool for medical diagnosis.
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