Ying Pan,Qiongjie Ding,Baohong Li,Xiaoxiong Wang,Yiwei Liu,Junhao Chen,Fei Ke,Jianqiang Liu
The construction of efficient and superior adsorbed materials for the precise removal of hazardous contaminants from water have gained significant attention by the scientific community. In this work, a facile bimetallic zeolitic-imidazolate framework (Co x Zn y -JUC-160) by using self-adjusted strategy (SAS) was developed to synthesize various N-doped Co-based hierarchical porous carbon composites through sacrificial template route. A series of highly porous magnetic materials with well-dispersed or reduced Co particle size have been fabricated by fine tuning the ratio of Co and Zn in the precursors. For the first time the effect of the Co/Zn ratio on the textural properties and drug adsorption performance of the resultant porous carbon composites have been investigated systematically. Remarkably, the optimal Co@NC-1/4-900 possesses large specific surface area, hierarchical pore structures, and well-distributed Co adsorption sites which facilitates the exposure of active Co center and realizes fast diffusion of amodiaquine (ADQ) molecules with record-high adsorption capacities (890.23 mg g −1 ). The presented synthetic strategy provides deep insights into the development of highly efficient recyclable magnetic adsorbent for the removal of contaminants.
Integrating other metal ions into mono-metallic metal–organic framework (MOF) to form bi-metallic MOF is an effective strategy to enhance the performance of MOFs from the internal structure. In this study, two-dimensional (2D) cobalt/zinc-porphyrin (Co/Zn-TCPP) MOF nanomaterials with different Co/Zn molar ratios were synthesised using a simple surfactant-assisted method, and novel dopamine (DA) sensing methods were constructed based on these materials. The characterisation results showed that all MOF with different Co/Zn molar ratios presented a nanofilm, and the Co and Zn elements were uniformly distributed. All sensors based on Co x Zn 100− x -TCPP had a certain catalytic performance to DA. Among them, the sensor based on CO 25 Zn 75 -TCPP showed the strongest signal response, indicating that the catalytic performance of MOF on DA can be adjusted by changing the Co/Zn molar ratio. The doping of metal ions improves the chemical environment of the pores, and increases the types and spatial arrangement of the active sites of the MOF, which is beneficial to the electron transfer and exchange with DA; Co 2+ and Zn 2+ active centres have a synergistic promotion effect, so the catalytic activity of MOF is significantly improved. The linear range at the potential of 0.1 V based on Co 25 Zn 75 -TCPP for DA was 5 nM–177.8 μM, with a detection limit of 1.67 nM (S/N = 3). The sensor exhibited a good selectivity for detecting DA. This research is expected to provide new ideas and references for constructing high-performance sensing interfaces and platforms. Graphical abstract
危险品化学品经营许可证（带存储）