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Detection of mercury (Hg 2+ ) and sulfide (S 2- ), 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 2+ and S 2- is critical. Herein, we proposed a novel and convenient strategy for optical detection of Hg 2+ and S 2- by employing a carboxymethyl cellulose sodium/silver nanoparticle (CMS/AgNPs) colloidal solution, in which AgNPs were used as monitor for Hg 2+ and S 2- , and the CMS was utilized as both the stabilizer and the hydrophilic substrate for AgNPs. Well-identifiable peaks for Hg 2+ and S 2- 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 2+ cation and S 2- anion, accompanying with color change. Impressively, the optimal AgNPs anchored CMS exhibited a high sensitivity and selectivity toward Hg 2+ and S 2- , the change in absorbance was linear with the concentration of Hg 2+ (0-50 μM) and S 2- (15-70 μM), and the lowest limits of detection (LOD) were 1.8 × 10 -8 M and 2.4 × 10 -7 M, respectively. More importantly, owing to the superior properties in testing Hg 2+ and S 2- , 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 2+ ) and anion (S 2- ) ions and open up new opportunities for selecting other kinds of ions.

polymers

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