One-pot Microwave-assisted Synthesis of Passivated Fluorescent Carbon Dots for Fe(Ⅲ) Detection†

doi:10.7503/cjcu20180031

Abstract

Abstract:

Carbon dots(CDs) were synthesized through one-pot microwave-assisted synthesis method using citric acid as carbon source, glycerol as solvent and passivation agent. The obtained CDs have uniform size and good dispersion. The proposed synthesis method is rapid, simple and eco-friendly. The CDs were applied to detecting Fe³⁺ in practical water samples based on fluorescence(FL) quenching mechanism with a linear range of 5—50 μmol/L, a detection limit of 2.16 μmol/L and the recoveries of 96.8%—106.0%, which showed good feasibility in detection of Fe³⁺ in practical water samples.

Key words: Carbon dots, Microwave-assisted method, Fe³⁺ detection, Fluorescence quenching method

TrendMD:

XU Yuan, CHEN Yanhua, DING Lan. One-pot Microwave-assisted Synthesis of Passivated Fluorescent Carbon Dots for Fe(Ⅲ) Detection^†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1420.

Figures/Tables 10

Scheme 1 Schematic illustration of the synthesis process

Fig.1 Quantum yields of the CDs with different dosages of citric acid(A) and different reaction time(B)

Fig.2 TEM image(A) and XRD pattern(B) of the CDs Insert of (A): corresponding size distribution.

Fig.3 FTIR(A) and XPS(B) spectra of the CDs and high resolution XPS spectra of C1s(C) and O1s(D) of the CDs

Fig.4 Fluorescence and UV-Vis absorption spectra of the CDs^ Insert: photographs of the CDs solution under UV light(left) and visible light(right).

Fig.5 FL intensity of the CDs at different pH values with and without the addition of 50 μmol/L Fe3+(A), FL intensity of the CDs under different concentration of NaCl(B), FL decay of the CDs in the absence and presence of 50 μmol/L Fe3+(C) and UV-Vis absorption spectra of the CDs before and after adding 50 μmol/L Fe3+(D)

Fig.6 Change of FL intensity of the CDs with 50 μmol/L Fe3+ against different incubation time(A) and effect of different metal ions(50 μmol/L) on the FL intensity of the CDs(B)

Fig.7 FL spectra of the CDs with different concentrations of Fe3+(A) and the linear relationship between

Table 1 Analytical results of Fe3+ in spiked practical water samples by the proposed method

Sample	Added/(μmol·L^-1)	Total found/(μmol·L^-1)	Recovery(n=3, %)	RSD(n=3, %)
Tap water 1	5	4.85	96.8	1.1
	10	9.75	97.4	0.4
	20	19.48	97.4	0.6
Tap water 1	5	5.18	103.8	0.5
	10	10.15	101.5	1.0
	20	20.03	100.2	0.7
Lake water	5	5.29	106.0	0.6
	10	10.58	105.9	0.6
	20	20.32	101.6	0.5

Table 2 Comparison of different CDs-based Fe3+ probe

Probe	Linear range/ (μmol·L^-1)	LOD/ (μmol·L^-1)	Ref.	Probe	Linear range/ (μmol·L^-1)	LOD/ (μmol·L^-1)	Ref.
CDs	0—7000	35	[27]	N-CDs	2—25	0.9	[31]
CDs	12.5—100	9.97	[28]	N-CDs	20—100	2.56	[32]
GQD	1—80	7.22	[29]	CDs	5—50	2.16	This work
N-CDs	0—4	1.17	[30]

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