Herein, we reported a label-free and reliable photoelectrochemical (PEC) platform for highly selective monitoring of norepinephrine (NE) based on metallic Bi nanoparticles anchored on hollow porous ZnSnO3 microspheres (3D Bi/ZnSnO3) via a simple solvothermal strategy. The designed 3D Bi/ZnSnO3 Schottky junction exhibited a unique photoanodic response toward NE among other catechol derivatives, such as epinephrine (EP) and dopamine (DA), and effectively shielded the interference from thirteen coexisting biomolecules like uric acid (UA) and ascorbic acid (AA). High selectivity and excellent sensitivity could be correlated to the unique chelating coordination interaction between NE and Zn2+ at surface sites as well as the efficient carrier separation of Bi/ZnSnO3, thereby developing a novel “signal-on” label-free and selective strategy for NE detection. The proposed Bi/ZnSnO3-based PEC sensor achieved remarkable NE biosensing with a low detection limit of 0.68 nmol L−1 and a wide response ranging from 0.002 to 350.0 μmol L−1. The applicability of this biosensor was realized for the selective analysis of NE in human serum, human urine and injection samples, laying the foundation for the label-free PEC monitoring of NE in biological fluids.
Chunran Zhao,Lin Yue,Shude Yuan,Xujie Ren,Zhihao Zeng,Xin Hu,Leihong Zhao,Ying Wu,Yiming He
A composite of cheap metallic Bi-decorated ZnSnO 3 was synthesized via a solvothermal method and applied for photocatalytic N 2 fixation for the first time. The results demonstrated that the Bi/ZnSnO 3 composite with 1.5 % Bi exhibited superior photocatalytic performance. with the optimal sample producing NH 3 at a rate of 988 μmol/L g -1 h −1 under simulated sunlight. This is 5 times faster than that of pure ZnSnO 3 . Additionally, the Bi/ZnSnO 3 composite showed significantly better photocatalytic performance than pure ZnSnO 3 in RhB degradation. Structural analyses confirmed successful loading of Bi nanoparticles on the surface of ZnSnO 3 . Furthermore, diffuse reflectance spectroscopy analysis revealed that the surface plasmon resonance effect of metal Bi effectively improved the optical absorption performance. However, the sensitization of metal Bi had a limited contribution to the high photocatalytic activity of the Bi/ZnSnO 3 . Electrochemical analyses indicated that the Schottky barrier formed between Bi and ZnSnO 3 captured photo-generated electrons and promoted the charge separation, which was considered responsible for the increased photoactivity of Bi/ZnSnO 3 .This work provides a new application of Bi/ZnSnO 3 and may offer new ideas for the application of ZnSnO 3 materials in the field of photocatalysis, which are crucial for addressing environmental pollution and energy conversion challenges.
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