An elegant and handy selective sensor for ppt level determination of mercury ions

Abstract

Competitive adsorption of Hg2+ on graphene in the presence of fluorescein leads to mercury sensing ability for the graphene dye unit.

Nitrogen-Doped Carbon Dots from Averrhoa carambola Fruit Extract as a Fluorescent Probe for Methyl Orange

“…The relative band intensity ratio ( I D /I G ) is a key parameter to predict the graphitization degree of carbon nanomaterials [30]. The I D /I G value of AC-NCDs was found to be 1.6 (in general, I D /I G is higher than 1 for well amorphous carbon), which indicates a low degree of graphitic order, sufficient major surface defects, and plenty of surface functional groups [31]. A high degree of defect formed by nitrogenation and oxygenation processes during synthesis partially destroys the graphitic structure of AC-NCDs [32,33].…”

Development of a waste-derived lignin-porphyrin bio-polymer with enhanced photoluminescence at high water fraction with wide pH range and heavy metal sensitivity investigations

“…57 Porphyrins and their derivatives have been proven useful in metal ion detection with high selectivity and sensitivity. 28,58 The four-nitrogen-containing macrocycle of porphyrin core is known to stabilize metal ions and hence been widely used in sensor and sorbent. 59 AL-CTPP demonstrates similar property in heavy metal ions sensing.…”

Detection of mercury ions in water using a membrane-based colorimetric sensor

“…Meanwhile, an optical sensor converts a chemical/biological reaction into a light or a color signal. Among these methods, optical sensors (colorimetric [16][17][18][19] and uorescence [20][21][22][23][24] sensors) appear to offer the simplest technique to determine the presence of target analytes in a testing solution, because of the capacity for naked-eye recognition and short detection time. Indeed, the sensor output signal gives measurable color changes without any spectroscopic instrumentation 25 upon reaction of a target analyte with the optical indicator ligand that is immobilized on the membrane substrate.…”