Preparation of a Novel Carbon Quantum Dot Photoluminescent Probe and Its Selective Detection of Mn2+
A photoluminescent probe for Mn2+detection was constructed using photoluminescent carbon quantum dots(CQDs)obtained from the traditional Chinese medicinal material Magnolia officinalis as the carbon source via a one-step hydrothermal method.These CQDs exhibit excellent photoluminescence performance,including a maximum excitation wavelength of 285 nm,maximum emission wavelength of 425 nm,and a photoluminescent quantum yield of 28.4%.The Mn2+photoluminescent probe shows exceptional selectivity,excellent anti-interference ability,and high sensitivity.Over the Mn2+concentration range of 0.2‒800 μmol/L,a linear correlation exists between(I0-I)/I and Mn2+concentration,with a correlation coefficient of 0.9996 and a low limit of detection at 52 nmol/L.Mn2+in real water samples was detected by adding 5,50,and 100 μmol/L Mn2+to the samples.The relative standard deviations were 0.9%‒2.9%,and the recoveries were 98.8%‒101.5%.This novel CQDs photoluminescent probe has broad application prospects in the environmental analysis of Mn2+.
Mn2+carbon quantum dotsphotoluminescent quenchingChinese medicinal material Magnolia officinalis
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