Graphitic Carbon Nitride/Chitosan Composite for Adsorption and Electrochemical Determination of Mercury in Real Samples

Abstract

In this research, graphitic carbon nitride (g-C 3 N 4 ) was synthesized using pyrolysis of melamine and its phase, morphology, composition, and structure were characterized by using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive analysis of X-rays, and FT-IR spectroscopy. The modification of carbon paste electrode with g-C 3 N 4 /chitosan composite has been performed using the casting method. Experimental results demonstrated the superb adsorptive properties of g-C 3 N 4 /chitosan composite through Hg(II). Differential pulse voltammetry (DPV) was applied for quantitative determinations. The linear calibration curves is obtained in the ranges of 1.0 × 10 −6 to 8.0 × 10 −5 mol L −1 and 1.0 × 10 −7 to 5.0 × 10 −6 mol L −1 . The proposed protocol can offer a highly selective and sensitive method for the detection of Hg(II) with a detection limit of 1.0 × 10 −8 mol L −1 . Determination of Hg(II) was performed in the presence of Fe(II) and Cu(II). Finally, the modified electrode has been applied for sensitive determination of Hg(II) in real samples.

Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation

“…The detection of elemental C and N (inset of Fig. 1) using energy-dispersive X-ray spectroscopy (EDS) was attributed to the presence of pristine g-C 3 N 4 and CDs [44]. A small peak of elemental O inevitably appeared due to reaction under ambient conditions.…”

“…The band in the range of 1230–1650 cm −1 corresponded to the stretching of sp 3 C–N and sp 2 C=N in CN heterocycles that exists within the g-C 3 N 4 compound [52]. The sharp peak at 811 cm −1 corresponded to the alkyne C–H bond (trisubstituted) or the breathing mode of the heptazine arrangement [44]. The alkene C=C bond (conjugated) at 1639 cm −1 was due to the connection between heptazine-based g-C 3 N 4 [53].…”

An Electrochemical Sensor of Poly(EDOT-pyridine-EDOT)/Graphitic Carbon Nitride Composite for Simultaneous Detection of Cd2+ and Pb2+

“…It should be noticed that the electrochemical analysis of 10 wt % poly(BPE)/g-C 3 N 4 composite for trace metal ions may be attributed to the lone-pair electrons of nitrogen in the g-C 3 N 4 . The report shows that the highly ordered tri-s-triazine units contain many ideal coordination sites and thus metal ions can intercalate into g-C 3 N 4 through the lone-pair electrons of nitrogen [ 26 , 27 , 28 , 29 ]. The combination of poly(BPE) and g-C 3 N 4 not only improved the conduction pathway on the electrode surface, but also produced a strong conjugate effect on them, enhancing the adsorption of metal ions.…”

“…Recently, more and more attention has been focused on the application of g-C 3 N 4 in the field of electrochemical sensors [ 26 , 27 , 28 ]. It has been reported that metal ions can be absorbed on a g-C 3 N 4 matrix through electrostatic bonding or coordination with several N-atoms in the tri-s-triazine ring [ 29 ].…”

Application of a Polypyrrole/Carboxy Methyl Cellulose Ion Imprinted Polymer in the Electrochemical Detection of Mercury in Water

“…Furthermore, the modified electrode in this work was compared with other previous works . The proposed GCE/PPy/S‐IIPs electrode shows good analytical results as shown in Table .…”