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

Micro & nano letters

article

Raju Dugyala¹  Mir Zahoor Gul¹  Sriramoju Manoj Kumar¹  Sashidhar Rao Beedu¹ 

[1] Department of Biochemistry, University College of Science, Osmania University

关键词: membranes;    effluents;    mercury (metal);    nanoparticles;    scanning electron microscopy;    colorimetry;    toxicology;    chemical sensors;    electrokinetic effects;    silver;    X-ray chemical analysis;    biotechnology;    contamination;    strip-based nanosilver biocomposite;    rapid screening;    aqueous mercury;    cost-effective colorimetric method;    aqueous system;    silver nanoparticle;    AgNP;    gum kondagogu;    natural biopolymer;    reducing stabilising agent;    GK-AgNPs composites;    yellow colour spot;    aqueous solution;    inductively coupled plasma mass spectrometry;    nitrocellulose membrane based mercury sensor;    on-site screening;    energy-dispersive X-ray spectroscopy;    Hg2+;    Ag;   

DOI  :  10.1049/mnl.2018.5314

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

A simple, rapid and a cost-effective colorimetric method for detection of Hg 2+ 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 Hg 2+ 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 Hg 2+ 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 Hg 2 + . The interference of other metal ions was also studied to validate Hg 2+ specificity. This method was successfully employed to screen Hg 2+ 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 Hg 2+ contamination in the aqueous system.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND