Carboxymethylagarose-AuNPs generated through green route for selective detection of Hg2+ in aqueous medium with a blue shift. (6th March 2015)

• Record Type: Journal Article
• Authors: Chaudhary, Jai Prakash; Kumar, Anshu; Paul, Parimal; Meena, Ramavatar
• Is Part Of: Carbohydrate polymers. Volume 117(2015)
• Page Start: 537
• Page End: 542
• Publication Date: 2015-03-06
• Subjects: CMA-AuNPs -- Green process -- Blue shift -- Amalgam -- Mercury sensor; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2014.10.016
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Synthesis of biopolymer functionalized AuNPs employing a rapid and green route. Selective detection of Hg 2+ in aqueous media with a concomitant blue shift. Core etching fundamentals to detect Hg 2+ in form of Amalgam (Au–Hg). CMA-AuNPs exhibits efficiency to detects Hg 2+ in the range of 0.01–100 ppm. Gold metal was recovered from aqueous spent of solution using dil HNO3 . Abstract: We report here a facile, rapid, cost-effective method via a green route for the selective detection of Hg 2+ in aqueous media. In this study carboxymethylagarose (CMA) is used to generate gold nanoparticles and subsequently to act as a stabilizer for the CMA-functionalized gold nanoparticles (CMA-AuNPs). The resulting CMA-AuNPs was characterized by UV–visible, X-ray diffraction, transmission electron microscopy (TEM), dynamic light scattering (DLS), atomic force microscopy (AFM) and zeta potential measurements. Zeta potential value (∼ −73 mv) of CMA-AuNPs in the aqueous medium shows its higher stability. When CMA-AuNPs were exposed to an aqueous Hg 2+, a blue shift for its localized surface plasmon resonance absorbance (LSPR) band is observed along with significant colour change of the solution. The probe enables to detect Hg 2+ in the range of 0.01–100 ppm even in spiked lake water samples. This study offers a sustainable and eco-friendly route for selective detection of Hg 2+ in aqueous solution and may find potential application towards water purification.