Abstract
Detection of mercury (Hg2+) and sulfide (S2−), 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 Hg2+ and S2− is critical. Herein, we proposed a novel and convenient strategy for optical detection of Hg2+ and S2− by employing a carboxymethyl cellulose sodium/silver nanoparticle (CMS/AgNPs) colloidal solution, in which AgNPs were used as monitor for Hg2+ and S2−, and the CMS was utilized as both the stabilizer and the hydrophilic substrate for AgNPs. Well-identifiable peaks for Hg2+ and S2– were obtained in water based on UV–VIS absorption spectra, the absorbance intensity and/or position of nano-silver vary with the addition of Hg2+ cation and S2– anion, accompanying with color change. Impressively, the optimal AgNPs anchored CMS exhibited a high sensitivity and selectivity toward Hg2+ and S2−, the change in absorbance was linear with the concentration of Hg2+ (0–50 μM) and S2− (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 Hg2+ and S2−, 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 (Hg2+) and anion (S2−) ions and open up new opportunities for selecting other kinds of ions.
Highlights
IntroductionWater pollution has been considered as one of the most serious and dangerous forms of pollution, which has aroused numerous environmental problems and drawn growing attention [1,2,3,4]
Nowadays, water pollution has been considered as one of the most serious and dangerous forms of pollution, which has aroused numerous environmental problems and drawn growing attention [1,2,3,4].Mercury (Hg2+ ) and sulfide (S2− ) are well-known toxic ions and hazardous chemicals
The absorbance of AgNPs decreases and red shift occurs in 200 μL of Tollens’ reagent, indicating that the nano-silver particles become larger at a higher concentration, so the optimal amount is 100 μL of Tollens’ reagent
Summary
Water pollution has been considered as one of the most serious and dangerous forms of pollution, which has aroused numerous environmental problems and drawn growing attention [1,2,3,4]. It is very necessary to develop some simple, routinely-monitored selective and sensitive techniques for Hg2+ and S2− in environmental water samples. Various functionalized Ag and Au nanoparticles have been extensively developed for the selective and sensitive detection of S2− and Hg2+ [20,21,22,23,24] Such strategies suffer from some drawbacks, including complicated synthesis, high detection limit, and single ion detection [25,26,27,28]. From the viewpoint of practical application, an excellent sensor should have highly sensitive and selective performance, an environmentally friendly synthetic route, and have a simple and economical operation, and show rapid and efficient detection toward multiple ions simultaneously. The system can be utilized directly in lake and tap water without any other treatment
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
