Strip-based nano-silver biocomposite construct for rapid screening of aqueous mercury

Raju Dugyala; Mir Zahoor Gul; Sriramoju Manoj Kumar; Sashidhar Rao Beedu

Strip-based nano-silver biocomposite construct for rapid screening of aqueous mercury

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Author(s): Raju Dugyala¹ ; Mir Zahoor Gul¹ ; Sriramoju Manoj Kumar¹ ; Sashidhar Rao Beedu¹
- Affiliations: 1: Department of Biochemistry , University College of Science, Osmania University , Telangana 500007 , India
Source: Volume 14, Issue 6, 29 May 2019, p. 604 – 608
DOI: 10.1049/mnl.2018.5314 , Online ISSN 1750-0443

Received 19/06/2018, Accepted 11/02/2019, Revised 25/12/2018, Published 29/05/2019

A simple, rapid and a cost-effective colorimetric method for detection of Hg²⁺ in an aqueous system using silver nanoparticle (AgNP) has been developed in the present study. AgNPs were synthesised using gum kondagogu (GK), a natural biopolymer that acts as both reducing and stabilising agent. The stability of GK-AgNPs composites was determined by zeta potential and was observed to be −30.43 mV. The yellow colour spot on the nitrocellulose membrane turned colourless at Hg²⁺ concentration of 20 ppm in aqueous solution, which can be observed visually. By using inductively coupled plasma mass spectrometry, it was observed that as the concentration of Hg²⁺ increases the Ag concentration decreased. Further, scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to confirm the morphological changes on membrane before and after treating with Hg² ⁺. The interference of other metal ions was also studied to validate Hg²⁺ specificity. This method was successfully employed to screen Hg²⁺ in industrial effluents. In summary, this study entails the development of a nitrocellulose membrane based mercury sensor that has practical applicability for on-site screening of Hg²⁺ contamination in the aqueous system.

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Strip-based nano-silver biocomposite construct for rapid screening of aqueous mercury

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