Heavy Metals Detection Based on UiO-66-NH₂ Modified Gold Surface via Surface Plasmon Resonance Technique

抄録

We focus on modifying Au surface with UiO-66-NH₂ for heavy metal detection via surface plasmon resonance (SPR) technique. Two conditions were tested for the deposition of UiO-66-NH₂, i.e., spin-coating immediately after dropping the UiO-66-NH₂ dispersion solution on the surface (0-minute) and spin-coating after incubating for 15 min. (15-minute). The 0-minute condition resulted in a more uniform UiO-66-NH₂ distribution, thus selected for further investigation of heavy metal ion adsorption. The SPR signal showed a response to As(V) ion adsorption on UiO-66-NH₂ layer in aqueous solution, demonstrating a novel and effective method for As(V) detection in the 10 to 50 mg mL^-1 range. This modified sensor exhibited improved sensitivity for detecting As(V) ions.