Bin Fang,Zipeng Xing,Weifeng Kong,Zhenzi Li,Wei Zhou
Electron spin polarization plays a vital role on photocatalysis but rarely considered. Herein, a double-layer hollow yolk-shell Pd/CoP@CoNiP superstructure photocatalyst is prepared via two ion exchanges approach using Co-MOF as a template. It shows ferromagnetic characteristics and obvious photothermal effect due to the special structure. Interestingly, the photocatalytic hydrogen evolution is enhanced about twice under external magnetic field compared to field-free. The improvement can be ascribed to the enhanced electron spin polarization of the vacancy defects for Pd/CoP@CoNiP superstructure and the formation of Z-scheme heterojunctions promoting efficient photogenerated charge separation and prolonging the lifetimes obviously. The special double-layer hollow yolk-shell superstructure is another reason for the optimized photocatalytic performance, which could expose adequate surface active sites for photocatalytic reaction. Moreover, the high stability of this defective Pd/CoP@CoNiP superstructure indicates the potential applications in field of photocatalysis. This strategy may provide new insights for fabricating high-efficient superstructure photocatalysts with electron spin polarization.
Wenqiang Li,Changpeng Xu,Lin Huang,Zhiguan Huang,Bin Zhou,Yuhe Li,Jianghui Dong,Liping Wang
Precise detection of Fe 3+ ions in vitro is important for diagnosis of disease and bone health. Covalent organic polymers (COPs) are chosen as the precision probes, due to their light-weight, stable-bonds, and fast-response. In this work, a new fluorescent COP, pyrene-2,7-diboronic-COP(PD-COP), was designed and its feasibility in detection of iron concentration in cells was tested. PD-COP showed good performance in selective detection of Fe 3+ , among other metal ions. Its high anti-interference property and recyclability provide the theoretical basis for practical applications. PD-COP could selectively detect Fe 3+ ions with low limit of detection (LOD) at a concentration of about 0.68 µM. The quenching mechanism could be due to the transfer of electron. The in vitro experiments using cells also showed that the PD-COP had good biocompatibility, and the ability to detect Fe 3+ ions in cells. In conclusion, we successfully synthesized a novel COP, with high sensitivity that could selectively detect Fe 3+ ions. The COP had the ability to enter the cell membrane and combine with iron ions, which provided a new method of monitoring bone health.
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