Abstract
A new and simple colorimetric method is proposed for the detection of Mn2+ based on the catalytic ability of silver nanoparticles (AgNPs) to oxidize Mn2+ to Mn4+ in slightly basic medium. The addition of Mn2+ to the AgNPs solution at pH 9.0, the AgNPs produced a naked eye observable color change from yellow to gray. This variation in color is attributable to the catalytic reaction of Ag2O coated layer of AgNPs with Mn2+, causing the aggregation of AgNPs, which were confirmed by TEM analysis. The energy dispersive x-ray spectroscopy (EDX) offered evidence about the suggested catalytic reaction. A nicely linear calibration plot in the concentration range of 1 × 10−7 to 5 ×10−6 M with a correlation coefficient of 0.995 was obtained using UV–vis spectroscopy. The proposed sensing method provided a detection limit of 5.2 × 10−8 M for Mn2+ and exhibited a highly selective response that enabled the rapid colorimetric detection of Mn2+ in real water samples.
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