Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

Abstract

This study aimed to synthesize dimethylglyoxime (DMG) (N-source)-doped graphene quantum dots (N-GQDs) via simultaneous pyrolysis of citric acid and 1.0% (w/v) DMG. The maximum excitation wavelength (λ max , ex = 380 nm) of the N-GQD solution (49% quantum yield (QY)) was a red shift with respect to that of bare GQDs (λ max , ex = 365 nm) (46% QY); at the same maximum emission wavelength (λ max , em = 460 nm), their resonance light scattering (RLS) intensity peak was observed at λ max , ex/em = 530/533 nm. FTIR, X-ray photoelectron spectroscopy, XRD, energy-dispersive X-ray spectroscopy, and transmission electron microscopy analyses were performed to examine the synthesized materials. The selective and sensitive detection of Ni 2+ using the RLS intensity was performed at 533 nm under the optimum conditions consisting of both 25 mg L –1 N-GQDs and 2.5 mg L –1 DMG in the ammonium buffer solution of pH 9.0. The linearity of Ni 2+ was 50.0–200.0 μg L –1 with a regression line, y = 5.031 x – 190.4 ( r 2 = 0.9948). The limit of detection (LOD) and the limit of quantitation (LOQ) were determined to be 20.0 and 60.0 μg L –1 , respectively. The method precision expressed as % RSDs was 4.90 for intraday ( n = 3 × 3) and 7.65 for interday ( n = 5 × 3). This developed method afforded good recoveries of Ni 2+ in a range of 85–108% when spiked with real water samples. Overall, this innovative method illustrated the identification and detection of Ni 2+ as a DMG complex with N-GQDs, and the detection was highly sensitive and selective.

New schiff base ligand type [LH2] donor derevative from 4-Aminophenol with Manganese (II), Cobalt(II), Nickal(II), and Copper(II)

“…The band at (3196 cm -1 ) assigned to υ(O-H) (Pimsin et al, 2021) E), this band has been shifted to a higher frequency for the Mn(II), Co(II), Ni(II), and Cu(II)metal ion complexes at range of (3211-3221 cm -1 ) (Mushtaque et al, 2017) in comparison to that of the free ligand, as a result of the coordination between the ligand and metal ion. The band at (2970 cm -1 ) assign to the υ(C 6 H 6 ) ring (Meltzer et al, 2021), and the band at (1691 cm -1 ) of the υ(C=N) (Mondal et al, 2021) of the ligand these two bands has been shifted to a lower frequency for all the formed complexes, affected by the coordination.…”

Design of Fluorescent Carbon Dots (CDs) for the Selective detection of Metal‐Containing Ions

“…All these processes have several drawbacks, such their cost, the requirements of high sample volume and the complexity of the devices. An alternative method to those mentioned above is represented by the use of chemo and fluoro sensors and quantum dots have proven to be excellent candidates for this purpose [143] . The study of Gong et al.…”

“…An alternative method to those mentioned above is represented by the use of chemo and fluoro sensors and quantum dots have proven to be excellent candidates for this purpose. [143] The study of Gong et al describes how N-doped CD from CA and urea have been obtained and subsequently modified with imidazole. The CDimidazole product was used as fluorescent probe to establish an analytical method for Ni 2 + sensing.…”

On the Equilibrium of Mono‐ and Dinuclear Cu(II) Dimethylglyoxime Complexes and its Exploitation for the Simple Preparation of Cu(I) Salts [Cu(CH3CN)4]X (X=ClO4−, BF4−, OTf−)

“…Dimethylglyoxime (H 2 dmg) is a versatile ligand in coordination chemistry as it readily forms complexes with divers d-metal ions such as iron, [1][2][3][4][5] cobalt, [3,[6][7][8][9] nickel, [3,[10][11][12][13][14] copper, [8,[15][16][17][18][19][20][21] zinc, [14,[21][22][23] palladium, [2,[24][25][26][27] and platinum, [2,25,[27][28][29] e. g. Since its establishment as quantitative detection reagent for Ni(II) ions in 1905, [10] it has extensively been used in trace analysis, metal uptake or deposition (only a few examples are given in the references). [30][31][32][33][34] It also just recently has been used to inhibit human amyloid beta peptide in vitro aggregation in the presence of Cu(II) and Ni(II). [35] Additionally, complexes with Co(II) are used in hydrogen evolution reactions (HER).…”