title: Highly selective and quantitative colorimetric detection of mercury(II) ions by carrageenan-functionalized Ag/AgCl nanoparticles.
abstract: The natural algal polysaccharide carrageenan was used for the greener synthesis of silver/silver chloride nanoparticles (Carr-Ag/AgCl NPs) without any toxic chemicals. We report the robust, highly selective, and sensitive colorimetric sensing of Hg2+ions using Carr-Ag/AgCl NPs without any further surface modification. The dark-brown color of a solution of Carr-Ag/AgCl NPs turned to white in a concentration-dependent manner with the addition of Hg2+ions, confirming the interaction of Carr-Ag/AgCl NPs with Hg2+ions. The plot of the extinction ratio of absorbance at 350nm to 450nm (A350/A450) for Carr-Ag/AgCl NPs against the concentration of [Hg2+] ions was linear, and the calibration curve was A350/A450=1.05254+0.00318×CHgwith a lower detection limit of 1μM. This portable and cost-effective method for mercury(II) ion sensing is widely applicable in on-field qualitative and quantitative measurements of [Hg2+] ions in environmental or biological samples.
authors.affiliation: School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea; Department of Nano, Medical & Polymer Materials, College of Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
authors.forename: Kannan Badri
authors.initials: KB
authors.lastname: Narayanan
authors.affiliation: School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea; Department of Nano, Medical & Polymer Materials, College of Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea. Electronic address: sshan@yu.ac.kr.
authors.forename: Sung Soo
authors.initials: SS
authors.lastname: Han
mesh_terms: D002351:Carrageenan / Q000737:chemistry*; D003124:Colorimetry; D007477:Ions; D008628:Mercury / Q000032:analysis*; D053768:Metal Nanoparticles; D012834:Silver
chemical_list: D007477:Ions; D012834:Silver; D002351:Carrageenan; D008628:Mercury
keywords: Ag/AgCl; Carrageenan; Mercury(II) ions; Nanoparticles; Polysaccharide; Sensing