Abstract
Increasing use of silver in various fields has caused Ag+pollution in water environment,taking great threats to people's health.As a consequence,establishing rapid and reliable methods for sensitive de-termination of Ag+is of great significance.Fluorescent(FL)sensors based on carbon dots(CDs),an ex-cellent carbonaceous nanomaterial with strong and stable fluorescence,have absorbed extensive atten-tions in analysis of pollutants due to its advantages of carbon sources being readily available,low cost,easy operation and fast response.Moreover,ion-imprinting is a better way to increase the selectivity of the proposed method.Present work described an effective method for the sensitive measurement of sil-ver ion in water samples in combination with magnetic ion-imprinted solid phase extraction and CDs based fluorescent sensor,which took full advantages of easy separation and high enrichment of magnetic solid phase extraction,high selectivity of ion-imprinting technology,and sensitivity and rapid response of fluorescent sensor from CDs.Sulfur-doped CDs derived from dithizone and magnetic ion-imprinted nanomaterial were prepared,and characterized with Fourier transform infrared spectroscopy and trans-mission electron microscope,etc.Magnetic Ag+imprinted nanomaterial based solid phase extraction was employed for separating and enriching Ag+from water samples.The significant parameters were opti-mized in detail.Under the optimal conditions,the proposed method provided good linearity in the range of 0.01-0.4 μmol/L and low detection limit of 3nmol/L.The reliability of the proposed method was val-idated with real water samples,and the results demonstrated that the proposed method was simple,robust,selective and sensitive detection tool for Ag+in real water samples.
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