FeS 2 nanosheets-H 2 O 2 -NaHCO 3 chemiluminescence method for procaine hydrochloride determination.

FeS 2 nanosheets (NSs) were produced and exploited as a new catalyst for a chemiluminescence (CL) reaction. The characterization of FeS 2 NSs was performed using spectroscopic methods. In this regard, transmission electron microscopy images showed that FeS 2 NSs have a length of ~0.5-1 μm. The direct optical band gap energy of FeS 2 NSs was found to be 3.45 eV. Prepared FeS 2 NSs were used to catalyze the NaHCO 3 -H 2 O 2 CL reaction. It was found that procaine hydrochloride (PCH) could reduce the intensity of the FeS 2 NSs-NaHCO 3 -H 2 O 2 CL reaction so, with increasing PCH concentrations, the intensity of light emission decreased. Therefore, a simple and sensitive method was introduced to measure PCH with a linear range expanded from 1.00 × 10 -6 to 1.00 × 10 -3  mol L -1 and an 8.32 × 10 -7  mol L -1 limit of detection. Studies related to the effect of foreign species and reaction mechanisms were performed. The application of the approach was verified by quantifying the PCH in the injection.