Abstract
In this study, meso‑tetrakis(4-carboxyphenyl)porphyrin (TCPP) was chemically bonded to the surface of graphene oxide (GO) nanosheets and characterized by various techniques. The sensing prowess of the prepared composite towards metal ions was investigated through photoluminescence (PL) spectroscopy. Our results indicate that TCPP-GO can detect Mn2+ ions through fluorescence quenching. Therefore, experiments related to concentration, selectivity, detection limit, and response time were conducted to study the performance of the TCPP-GO sensor. A linear response of fluorescence intensity of TCPP-GO and Mn2+ in the 25–270 μM range with a detection limit of 1.8 μM was observed. The competition test displayed that the presence of other ions such as Sn2+, Pt2+, Ca2+, Na+, Fe3+, Fe2+, Zn2+, Cu2+, Cr2+, Co2+, Ni2+ had no significant effect on detecting Mn2+ ions. Furthermore, the suggested sensor demonstrated excellent performance for sensing manganese ions in real water samples.
Published Version
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