Abstract
Environmental pollution derivated from toxic metals and organic toxins is becoming a serious issue worldwide because of their harmful effects on the ecosystem and human health. Here we are reporting an extremely selective and cost-effective colorimetric sensor for simultaneous recognition of Hg2+ and Pb2+ by using green synthesized silver nanoparticles (AgNPs) mediated from the environmental friendly roots extract of Bistorta amplexicaulis. Biogenic synthesized AgNPs were well-characterized by various spectroscopic techniques e.g., UV-vis, FT-IR, XRD, AFM, and Zetasizer. The photophysical potential of synthesized AgNPs toward common metal cations was explored via absorption spectroscopy and colorimetric assay. The hypsochromic shift in the SPR band of AgNPs can easily be detected through naked eyes vision from dark brown to light yellow in the case of Hg2+. A substantial reduction in the absorbance of AgNPs was recorded upon mixing with Pb2+. AgNPs based colorimetric sensor is highly sensitive toward Hg2+ and Pb2+ with a limit of detection (LOD) of 8.0 × 10−7 M and 2.0 × 10−7 M for Hg2+ and Pb2+, respectively. Furthermore, AgNPs showed promising catalytic activity for the degradation of methyl orange dye. These results demonstrate that Bistorta amplexicaulis stabilized silver nanoparticles have potential applications as a colorimetric sensor and an effective catalyst for the degradation of methyl orange.
Highlights
Environmental contamination due to heavy metals and organic dyes is becoming a serious issue worldwide due to their harmful effects on the ecosystem and human health (Duruibe et al, 2007)
For the preparation of Bistorta amplexicaulis stabilized AgNPs plant extract solution and AgNO3 (1 mM) solution was mixed in various ratios (1:1, 1:5, and 1:10 v/v), and resulted mixture was stirred at 25◦C for 30 min
Bistorta amplexicaulis stabilized AgNPs were characterized via various spectroscopic techniques including UV-visible, XRD, atomic force microscope (AFM), Zetasizer, and FTIR
Summary
Environmental contamination due to heavy metals and organic dyes is becoming a serious issue worldwide due to their harmful effects on the ecosystem and human health (Duruibe et al, 2007). There is a growing interest for quick on-site analysis with sensors that are capable of distinguishing heavy metal ions on a real-time basis In this regard, colorimetric sensors have attracted particular consideration for offering qualitative and quantitative information by naked-eye visibility without using sophisticated equipment (Tang and Li, 2017; Choudhary et al, 2020; Kateshiya et al, 2020). A different part of plant extracts (fruit, flower, leaves, and root) can be used to reduce and stabilize the metal/metal oxide nanoparticles in the “one-pot” synthesis method. Plant extracts stabilized AgNPs and AuNPs are used as colorimetric probe for the recognition of heavy metal ions (cadmium, mercury, lead, chromium etc.) in water (Singh J. et al, 2018). We are reporting the biogenic synthesis of AgNPs using Bistorta amplexicaulis root extract for the colorimetric recognition of Hg2+ and Pb2+ ion for the first time. The catalytic activity of nanoparticle was evaluated which revealed that AgNPs could be used as a catalyst for the degradation of methyl orange
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