Petrada Chunnuan. Detection of hydrogen peroxide and persulfate ion by gold nanorod sensor. Master's Degree(Chemistry). Chulalongkorn University. Office of Academic Resources. : Chulalongkorn University, 2020.
Detection of hydrogen peroxide and persulfate ion by gold nanorod sensor
Abstract:
Gold nanorods (GNRs) multicolor sensor were developed to determine hydrogen peroxide (H2O2) and persulfate (S2O82-) based on the etching of GNRs which was detected from either naked-eye or UV-visible spectroscopic method. The changed size of GNRs was directly related to the concentration of H2O2 and S2O82-. To obtain the optimum conditions for H2O2 and S2O82- determination, CTAB concentration, FeSO4 concentration and detection time were investigated. For H2O2, the working range was 0.20 to 3.0 mM where the good linear working range was in the range of 0.20 to 0.80 mM. LOD was 0.08 mM. Moreover, the GNRs conjugated hydrogel was tested for H2O2 determination. For S2O82-, the working range was 0.10 to 5.0 mM where the good linear working range was in the range of 0.10 to 1.0 mM. LOD was 0.022 mM. For the determination of S2O82- in real water sample, the effect of interfering anions was studied and found that the tolerance limits were 500 times over S2O82- concentration. This multicolor sensor could be used for S2O82- determination in pond-CU water sample with acceptable accuracy (%recovery = 104) and precision (%RSD < 2).