Issue 12, 2021

Graphitic carbon nitride embedded-Ag nanoparticle decorated-ZnWO4 nanocomposite-based photoluminescence sensing of Hg2+

Abstract

The adverse effects of the advancement of civilization have damaged the environment significantly by heavy metal ion toxicity, empoisoning soil, water, food, etc. In this work, Ag loaded metal tungstate–organic framework-based nanomaterials (g-C3N4/Ag/ZnWO4) which can generate more and more oxygen defects have played a crucial role in detecting selective toxic metal ions in solution. The PL intensity of the samples increases with compositing ZnWO4 with g-C3N4 and Ag, as the recombination of excited electrons with the holes at the oxygen vacancy sites increases. Here, a novel strategy has been adopted to develop a nanocomposite assembly of Ag-loaded ZnWO4 nano-rods with π conjugated sp2 hybridized g-C3N4 for fluorescence detection of Hg2+. The prepared nanocomposites have displayed great fluorescence catalysis for Hg2+ sensing in terms of selectivity, sensitivity, activity, and reaction kinetics. A linear relationship in the range of 0 nM to 2 μM has been obtained for the detection of Hg2+ in a buffer solution of pH = 7.2 (phosphate buffer) by the fluorophore g-C3N4/Ag/ZnWO4 and the minimum detection limit was found to be 0.23 nM. Furthermore, the synthesized nanocomposites were applied for Hg2+ detection in few real samples (pond water, sewage water, etc.), signifying their potential application in routine Hg2+ analysis. The probable mechanistic pathway for the sensing of Hg2+ by grafting the metal ion has also been studied in detail. Based on this mechanism an electronic computing system using an Implication circuit device has been constructed from the molecular information processing and a probable fluorescence mechanism (Jablonski diagram) was explored in which the material was found to possess some room-temperature phosphorescence (RTP).

Graphical abstract: Graphitic carbon nitride embedded-Ag nanoparticle decorated-ZnWO4 nanocomposite-based photoluminescence sensing of Hg2+

Supplementary files

Article information

Article type
Paper
Submitted
10 3 2021
Accepted
28 4 2021
First published
28 4 2021
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2021,2, 4041-4057

Graphitic carbon nitride embedded-Ag nanoparticle decorated-ZnWO4 nanocomposite-based photoluminescence sensing of Hg2+

U. K. Ghorui, J. Satra, P. Mondal, S. Mardanya, A. Sarkar, D. N. Srivastava, B. Adhikary and A. Mondal, Mater. Adv., 2021, 2, 4041 DOI: 10.1039/D1MA00211B

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