Highly selective visual monitoring of hazardous fluoride ion in aqueous media using thiobarbituric-capped gold nanoparticles

Trace colorimetric detection of Pb 2+ using plasmonic gold nanoparticles and silica–gold nanocomposites

“…The LSPR, which strongly depends on the shape, size and aggregation of nanoparticles, is of great interest in detection various species [3,[7][8][9]39,40]. The plasmonic based detection of Pb 2+ ions is vital to field environment monitoring because of their toxic effects on the human health.…”

“…In fact, the aggregation and corresponding color change of nano probe solutions driven by target analytes have been employed for the visual detection of certain analytes, such as Cd 2+ [40], F − [39] and Fe 3+ [8] and thus detection of Pb 2+ ions in present study. Therefore, upon addition of Pb 2+ ions the solution turned blue, induced by aggregation of SiO 2 @Au NCs, which was detected by the naked eye and also confirmed by a red shift and broadened peak in the UV-vis spectra [53].…”

“…In our most recent reports, in addition to produce an excellent review on the analytical techniques involving nanoparticles and core-shell nanocomposites as new generation water remediation materials [5], we have demonstrated not only the plasmonic detection of Fe 3+ [8], F − [39] and Cd 2+ [40] but also the removal of F − using nanomaterials from aqueous media [41][42][43].…”

“…Hence, in continuation of our interest in the application of nanomaterials [3,8,39,[40][41][42][43][44], we report novel, efficient, rapid and visual detection method for Pb 2+ ion based on the development of sensitive AuNPs and SiO 2 @Au nanocomposites (SiO 2 @Au NCs). Thus the present work describes the strategy for preparing citrate capped AuNPs and SiO 2 @Au NCs based on a multistep process via a sol-gel reaction [45,46] in which the AuNPs were modified with silica and their applications for the detection of Pb 2+ in aqueous samples.…”

Excellent fluoride decontamination and antibacterial efficacy of Fe–Ca–Zr hybrid metal oxide nanomaterial

“…In order to overcome the shortcomings relating to either high cost materials or excessive time and energy consumption in many synthesis processes, we have developed an efficient nanoadsorbent. Our particular area of interest is in finding an efficient, eco-friendly and reusable adsorbent for the removal of fluoride [21] and sensing of fluoride [22] as well as metal ions [23]. In addition to chemical toxicants, potable water is often contaminated with microbes for instance; Escherichia coli (E. coli).…”