Luminol chemiluminescence actuated by modified natural sepiolite material and its analytical application

Abstract

It was found that a modified natural sepiolite material could tremendously catalyze the chemiluminescence (CL) emission of the luminol–H₂O₂ system. A variety of characterization methods, including FTIR, XRD, SEM, BET and CL spectroscopy, were utilized to investigate the possible CL enhancement mechanism. Moreover, a modified natural sepiolite was used for the luminol-driven CL detection of H₂O₂. Under the optimum conditions, the CL intensity was proportional to the concentration of H₂O₂ in the range from 0.01 to 8 μM. The detection limit (S/N = 3) was 8.8 nM and the relative standard deviation (RSD) for twelve repeated measurements of 1.0 μM H₂O₂ was 2.5%. The proposed method was also successfully applied to detect H₂O₂ in tap and rain water samples with recoveries of 98–104%. Thus, this method can be used as a sensitive detection tool for the analysis of H₂O₂.