Longbao Yu,Yanfeng Tang,Xinlin Liu,Changchang Ma,Pengwei Huo,Jianming Pan,Weidong Shi,Yongsheng Yan
The Cadmium sulfide (CdS) microsphere photocatalysts with the cauliflower-like morphology have been synthesized by hydrothermal method. The as-prepared photocatalysts have been characterized by powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, UV–vis absorption (UV–vis), and the thermo-gravimetric analysis. The UV–vis measurements show that the CdS microsphere prepared with 2 h have a band gap about 2.13 eV, which is smaller than the reported 2.42 eV, thus the as-prepared photocatalysts can be easily photoexcited and exhibit better photocatalytic performance. The photo-degradation experiments have been performed with CdS photocatalysts prepared with various synthesis conditions. Particularly, the CdS microsphere photocatalysts show the highest degradation ratio (72.78%) of Oxytetracycline hydrochloride under the visible light irradiation.
Yan Zhao,Jian Gong,Xiaobin Zhang,Rongmei Kong,Fengli Qu
Recently, photoelectrochemical (PEC) biosensing has received considerable attention with wide applications in biotechnology and biomedicine. Here we report a novel PEC biosensing platform constructed via the combined strategy of both PEC analysis and bioetching. Urchin-like ZnO-Au@CdS microspheres were obtained by depositing Au nanoparticles (NPs) and CdS NPs on the surface of urchin-like ZnO microspheres. The introduction of intermediate electrotransfer of Au NPs to isolated ZnO and CdS systems significantly enhances the PEC property. CdS NPs can be irreversibly bioetched by an enzymatic reaction catalyzed by horseradish peroxidase (HRP) and H 2 O 2 . As a result, H 2 O 2 detection is realized based on the decrease of the intensity of the PEC signal. This mediator-free and interference-free sensing platform has a linear range from 0.15 to 100 μM with a detection limit of 0.04 μM H 2 O 2 at S/N = 3. Furthermore, glucose oxidase (GOD) was successfully immobilized on ZnO-Au@CdS microspheres to construct a glucose biosensor with a detection limit of 0.18 μM at S/N = 3. The PEC biosensor shows good sensing performance with low detection limit, mediator-free and accuracy, strong anti-interference, promising its application in PEC biosensing.
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