A Green Rapid and Efficient Dual-Sensors for Highly Selective and Sensitive Detection of Cation (Hg2+) and Anion (S2−) Ions Based on CMS/AgNPs Composites

摘要

Detection of mercury (Hg ) and sulfide (S ), universal and well-known toxic ions, is crucial in monitoring several diseases. How to design and fabricate the high-performance sensor for simultaneously and accurately detecting the Hg and S is critical. Herein, we proposed a novel and convenient strategy for optical detection of Hg and S by employing a carboxymethyl cellulose sodium/silver nanoparticle (CMS/AgNPs) colloidal solution, in which AgNPs were used as monitor for Hg and S , and the CMS was utilized as both the stabilizer and the hydrophilic substrate for AgNPs. Well-identifiable peaks for Hg and S were obtained in water based on UV–VIS absorption spectra, the absorbance intensity and/or position of nano-silver vary with the addition of Hg cation and S anion, accompanying with color change. Impressively, the optimal AgNPs anchored CMS exhibited a high sensitivity and selectivity toward Hg and S , the change in absorbance was linear with the concentration of Hg (0–50 μM) and S (15–70 μM), and the lowest limits of detection (LOD) were 1.8 × 10 M and 2.4 × 10 M, respectively. More importantly, owing to the superior properties in testing Hg and S , the fabricated sensor was successfully applied for detection of target ions in lake and tap water samples. All these good results implied that the designed strategy and as-designed samples is promising in detecting cation (Hg ) and anion (S ) ions and open up new opportunities for selecting other kinds of ions.