Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guangxi, Key Laboratory of Environmental Pollution Control Theory and Technology, Guangxi Normal University, Guilin 541004, China.
ACS Appl Bio Mater. 2021 May 17;4(5):4582-4590. doi: 10.1021/acsabm.1c00315. Epub 2021 Apr 27.
As with excellent catalytic performance, palladium nanoclusters (PdNCs) have a wide range of applications. However, the traditional PdNCs are easy to agglomerate in the analysis system and lose their catalytic activity. A covalent organic framework (COF) has a definite structure, good stability, and easy surface functionalization. So, it is of great significance to develop stable PdNCs with high catalytic activity and then combine with advanced analysis techniques to analyze ultratrace small-molecule pollutants in the environment. In this research, a stable PdNC dispersed on a COF (PdTpPa) catalyst is prepared and we find it with strong catalysis for the NaHPO-HAuCl catalytic reaction. Furthermore, this nanocatalytic indicator reaction can be tracked by surface-enhanced Raman spectroscopy (SERS) and resonance Rayleigh scattering (RRS) dual-mode. Combined with a highly specific aptamer-modifying technique, a highly sensitive and selective SERS/RRS dimode assay platform for trace organic pollutants has been developed. The detection limits of oxytetracycline (OTC), glyphosate (GLY), tetracycline (TEC), and bisphenol A (BPA) are 0.64, 0.03, 6.2 × 10, and 0.53 × 10 ng/mL, respectively. This work also provides ideas for the application of COF materials and Pd nanocatalysts in the molecular spectral detection of trace pollutants.
具有优异的催化性能，钯纳米簇（PdNCs）具有广泛的应用。然而，传统的 PdNCs 在分析系统中容易聚集，从而失去其催化活性。共价有机骨架（COF）具有确定的结构、良好的稳定性和易于表面功能化。因此，开发具有高催化活性的稳定 PdNCs，并将其与先进的分析技术相结合，以分析环境中超痕量小分子污染物，具有重要意义。在这项研究中，制备了一种稳定的分散在 COF 上的 PdNC（PdTpPa）催化剂，我们发现它对 NaHPO-HAuCl 催化反应具有很强的催化作用。此外，这种纳米催化指示剂反应可以通过表面增强拉曼光谱（SERS）和共振瑞利散射（RRS）双模进行跟踪。结合高度特异的适体修饰技术，开发了一种用于痕量有机污染物的高灵敏度和选择性 SERS/RRS 双模分析平台。氧四环素（OTC）、草甘膦（GLY）、四环素（TEC）和双酚 A（BPA）的检测限分别为 0.64、0.03、6.2×10 和 0.53×10 ng/mL。这项工作还为 COF 材料和 Pd 纳米催化剂在痕量污染物的分子光谱检测中的应用提供了思路。
