Effective reduction of nitrophenols and colorimetric detection of Pb(ii) ions by Siraitia grosvenorii fruit extract capped gold nanoparticles

Abstract

Siraitia grosvenorii fruit extract capped AuNPs exhibited excellent catalytic activity in the reduction of nitrophenols and high sensitivity and selectivity for detection of Pb(ii) ions.

Highly sensitive and selective colorimetric detection of Pb(ii) ions using Michelia tonkinensis seed extract capped gold nanoparticles

“…4), which was caused by the formation of complexes between Pb 2+ and biomolecules adsorbed on the AuNPs surface. 8 The obtained result confirmed that the agglomeration was the dominant mechanism of the proposed colorimetric probe.…”

“…The negative charge of MT-AuNPs surface is due to the presence of negatively charged oxygen-containing groups such as OH − , COO −. 8 Indeed, the actual results obtained show that the zeta potential of MT-AuNPs at pH of 5.5 was −39.4 mV (Fig. 2c), which was noteworthy higher than that of AuNPs prepared using Sargassum carpophyllum (−0.047 mV) and Crinum latifolium leaf extract (−20.8 mV), suggesting excellent long-term stability of MT-AuNPs solution.…”

“…A calculated amount of Pb 2+ was initially spiked to the drinking water (bottled water, Aquafina), and MT-AuNPs were then added to the mixture. 8 After 5 min, the absorbance of the tested samples was measured at 545 nm to calculate the Pb 2+ concentration using the determined linear equation. Finally, the recovery was assessed by the equation: (found concentration)/(added concentration) × 100%.…”

“…5,6 Recently, nanomaterials have also been extensively used to fabricate different sensors for detecting heavy metals in aqueous solutions owing to their strong surface Plasmon resonance (SPR) and ease of functionalization. 7,8 Among them, gold nanoparticles (AuNPs) have received the most attention because of their high-performance sensing, environmental friendliness, tunable properties and photostability. 9 Several colorimetric sensors based on AuNPs have been designed for the quantitative analysis of different heavy metals such as Hg 2+ , 10 Fe 3+ , 11 Al 3+ , 12 Cd 2+ , 13 and Pb 2+ ions 14 , 15 .…”

Efficient and fast degradation of 4-nitrophenol and detection of Fe(III) ions by Poria cocos extract stabilized silver nanoparticles

“…Recently, AgNPs have also been extensively used for the colorimetric determination of toxic metals in the aquatic environment and biological system due to their strong surface plasmon resonance (SPR), size-and shape-dependent optical properties, and environmental friendliness (Uzunoglu et al, 2020). The principle of colorimetric detection is mainly based on the change in color and/or shift of the SPR peak caused by binding of the target analyte to the metal nanoparticles surface (Le et al, 2021c). These signals can be rapidly detected by UV-Vis spectroscopy and monitored with the naked-eye inspection.…”