2results about How to "Adsorptive stability" patented technology

This invention discloses a method for fabricating and applying a formaldehyde SERS sensor based on an Au@ZIF-8 core-shell nanostructure, belonging to the field of gas detection technology. Formaldehyde has an extremely small intrinsic Raman cross section, and ordinary SERS substrates lack the ability to capture it, resulting in weak detection signals at low concentrations. This sensor uses Au@ZIF-8 core-shell nanoparticles to assemble a two-layer thin film as the SERS substrate. The Au nanoparticles (AuNPs) serve as the electromagnetic enhancement core, while the ZIF-8 shell layer enriches and sieves formaldehyde molecules. A layer-to-layer deposition method is used to construct the double-layer thin film structure to obtain optimal SERS performance. This invention solves the problems of low sensitivity, poor specificity, insufficient stability, and difficulty in rapid on-site detection in existing formaldehyde detection technologies. The detection limit is as low as 0.16 ppt, and within a wide range from 0.01 ppb to 100 ppm, the characteristic peak intensity exhibits an excellent linear relationship with the logarithm of formaldehyde concentration (R² ≥ 0.995). It can specifically identify formaldehyde and exclude interference from other VOCs, making it suitable for rapid quantitative detection of formaldehyde in practical scenarios such as indoor environments and cigarette smoke.

The application discloses a magnesium ion imprinted polymer and a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing a soluble magnesium salt and methanol, adding 8-hydroxyquinoline into the mixture, stirring, fully complexing magnesium ions with the 8-hydroxyquinoline, then adding methacrylic acid into the mixture and stirring for a set time to obtain a mixed solution; adding ethylene glycol dimethacrylate into the mixed solution, stirring for a set time, then introducing inert gas into the solution to remove air in the solution, adding azobisisobutyronitrile into the solution, stirring at 55-65 DEG C to obtain a polymer; separating and washing the polymer, eluting the polymer with an EDTA solution, finally washing the polymer with ethanol and water until the polymer is neutral, and drying the polymer, so that the magnesium ion imprinted polymer is obtained. The magnesium ion imprinted polymer prepared by the application can be repeatedly used, and the adsorption performance of the regenerated magnesium ion imprinted polymer is still very stable.