Fluorescent graphitic carbon nitride and graphene oxide quantum dots as efficient nanozymes: Colorimetric detection of fluoride ion in water by graphitic carbon nitride quantum dots

Prospects of nano-carbons as emerging catalysts for enzyme-mimetic applications

“…The efficient detection of fluoride is because of the interaction between fluorine electrons and π-electrons of g-CNQDs and surface functional groups. 179 The colorimetric detection of mercury is shown by Mohammadpour et al , who used CNDs to fabricate the on and off sensors. 180 The detection of ascorbic acid (AA) was investigated by Chandra et al AA is an important nutrient used in different foods and pharmaceutical industries.…”

Fluorimetric and ratiometric colorimetric dual-mode detection of organophosphorus pesticides based on carbon dots/DTNB

“…In this work, the CDs were prepared by high-temperature solvent-free pyrolysis of trisodium citrate dihydrate and urea according to a previous study. 36 The morphology and size of the CDs were characterized by TEM. As shown in Fig.…”

“…CDs were synthesized according to a previous study with some modifications. 36 In detail, 0.06 g of trisodium citrate dihydrate and 0.3 g of urea were added to 1 mL of ultrapure water, and a transparent solution was obtained after ultrasonic treatment for 10 minutes. After this, the solution was placed in a blast drying oven at 200 °C for 1 hour and allowed to naturally cool to room temperature.…”

Highly Specific Colorimetric Probe for Fluoride by Triggering the Intrinsic Catalytic Activity of a AgPt–Fe3O4 Hybrid Nanozyme Encapsulated in SiO2 Shells

“…Das et al synthesized graphitic carbon nitride quantum dots (g-CNQDs) for F − detection in aqueous samples. 34 The catalytic activity of g-CNQDs was enhanced toward F − owing to p−π conjugation promoted by the presence of lone pairs on fluorine atoms and the delocalized π-conjugated system in g-CNQDs with nitrogenous surface functional groups. Thus, g-CNQDs can be successfully used as colorimetric probes for the quantitative and qualitative analysis of F − in various environmental samples.…”

“…Only a few studies have reported the colorimetric sensing of F – based on nanozymes. Das et al synthesized graphitic carbon nitride quantum dots (g-CNQDs) for F – detection in aqueous samples . The catalytic activity of g-CNQDs was enhanced toward F – owing to p−π conjugation promoted by the presence of lone pairs on fluorine atoms and the delocalized π-conjugated system in g-CNQDs with nitrogenous surface functional groups.…”