Determination of Hypochlorous Acid in Tap Water Using Highly Fluorescent Graphene Oxide

We report on the effect of hypochlorous acid (HClO) in the fluorescence emission of a fluorescent graphene oxide modified by hexylenediamine (GO-C6NH2). The synthesis process and the optical property of GO-C6NH2 were also introduced in detail. We found a strong quenching effect by HClO on the fluorescence emission of the fluorescent graphene oxide. The fluorescent quenching efficiency of GO-C6NH2 establish as a function of the amount of HClO, which the fluorescence intensity ratio is proportional to the different concentrations of HClO employed for the measurement. The results show that this fluorescent naomaterials are a promising tool for sensing trace HClO in tap water.