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 Mater Interfaces. 2020 Mar 11;12(10):12120-12132. doi: 10.1021/acsami.0c00205. Epub 2020 Mar 2.
Covalent organic frameworks (COFs) and Ag-doped COFs (AgCOFs) are prepared by the polycondensation procedure and characterized by electron microscopy and molecular spectral techniques. Their catalysis of the CuO particle reaction of glucose (GL)-Cu(II) was examined by resonance Rayleigh scattering (RRS), and AgCOFs were found to exhibit the strongest catalysis. The melamine (ML) aptamers (Apt) can attach to the surface of AgCOF and inhibit its catalytic activity. When melamine (ML) is added to this reacting solution, Apt-ML complexes are formed and the Apts are desorbed from the surface of AgCOF. As the concentration of ML increased, the catalytic activity of AgCOF increased and the RRS signal enhanced due to the increase in CuO particles. When the ML concentration was in the range of 0.79-13.2 nmol/L, the RRS intensity increased linearly, with a detection limit of 0.72 nmol/L. When the Apts of urea and bisphenol A (BPA) were replaced by the Apt, 66.7-1333 nmol/L urea and 0.33-2.7 nmol/L BPA, respectively, could also be determined, with detection limits of 30.4 nmol/L urea and 0.15 nmol/L BPA. Based on this, a new AgCOF amplification RRS method was established.
共价有机骨架（COFs）和掺银 COFs（AgCOFs）通过缩聚程序制备，并通过电子显微镜和分子光谱技术进行表征。通过共振瑞利散射（RRS）研究了它们对葡萄糖（GL）-Cu（II）中氧化铜颗粒反应的催化作用，发现 AgCOFs 表现出最强的催化作用。三聚氰胺（ML）适体（Apt）可以附着在 AgCOF 表面并抑制其催化活性。当三聚氰胺（ML）添加到该反应溶液中时，形成 Apt-ML 配合物，并且 Apt 从 AgCOF 表面解吸。随着 ML 浓度的增加，由于氧化铜颗粒的增加，AgCOF 的催化活性增加，RRS 信号增强。当 ML 浓度在 0.79-13.2 nmol/L 范围内时，RRS 强度呈线性增加，检测限为 0.72 nmol/L。当用 Apt 取代脲和双酚 A（BPA）的适体时，分别可以测定 66.7-1333 nmol/L 的脲和 0.33-2.7 nmol/L 的 BPA，检测限分别为 30.4 nmol/L 的脲和 0.15 nmol/L 的 BPA。基于此，建立了一种新的 AgCOF 放大 RRS 方法。
