Colorimetric Detection of Tin(Ⅱ) Ions Based on Layered Molybdenum Disulfide Nanosheets†

doi:10.7503/cjcu20150793

Abstract

Abstract:

In acetate/sodium acetate buffer(pH=4.5), tin(Ⅱ) ion displayed strong inhibitory effect on the color reaction of o-phenylendiamine(OPD) oxidized by hydrogen peroxide(H₂O₂) in the presence of layered molybdenum disulfide(MoS₂) nanosheets-based catalysts. This phenomenon was exploited to develop a colorimetric sensor for detection of tin(Ⅱ) ions. The experimental results showed that compared with the OPD/H₂O₂ colorimetric sensory system without MoS₂ nanosheets, MoS₂/OPD/H₂O₂colorimetric sensory system exhibited increased sensitivity, low detection limit, and wide linear range toward tin(Ⅱ) ions. Under the optimum experimental conditions, the tin(Ⅱ) sensor based on MoS₂/OPD/H₂O₂ system provided a linear range of 0.02—3.0 μmol/L with a low detection limit of 8 nmol/L(S/N=3). Moreover, the MoS₂/OPD/H₂O₂ system displayed a high selectivity for tin(Ⅱ) detection, and can be used for the detection of tin(Ⅱ) ions in lake water samples.

Key words: Layered molybdenum disulfide nanosheets, Tin(Ⅱ) ion, o-Phenylenediamine, Colorimetric sensor

CLC Number:

O657

TrendMD:

HU Jie, WANG Yong, NI Yongnian. Colorimetric Detection of Tin(Ⅱ) Ions Based on Layered Molybdenum Disulfide Nanosheets^†[J]. Chem. J. Chinese Universities, 2016, 37(3): 448.

Figures/Tables 9

Scheme 1 MoS2 nanosheets-based colorimetric detection of Sn2+

Fig.1 TEM(A), AFM(B) images and EDX profile(C) of the prepared MoS2Inset of (B) is the corresponding height plot.

Fig.2 UV-Vis absorption spectra of MoS2/OPD/H2O2(a), OPD/H2O2(b), Sn2+/MoS2/OPD/H2O2(c), Sn2+/OPD/H2O2(d), ascorbic acid/MoS2/OPD/H2O2(e) and ascorbic acid/OPD/H2O2(f)Conditions for the systems: OPD, 0.6 mmol/L; H2O2, 0.12 mmol/L; MoS2, 3.0 μg/mL; Sn2+, 4.0 μmol/L; ascorbic acid, 4.0 μmol/L.

Fig.3 UV-Vis absorption spectra for the MoS2/OPD/H2O2 system(A) and OPD/H2O2 system(B) with different concentrations of Sn2+(A) c(Sn2+)/(μmol·L-1) from top to bottom: 0, 0.02, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.5, 3.0, 3.5, 4.0; (B) c(Sn2+)/(μmol·L-1) from top to bottom: 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.5, 3.0, 3.5, 4.0.

Fig.4 Optical photographs related to Fig.3(A) and Fig.3(B)c(Sn2+)/(mmol·L-1): (A) a. 0, b. 0.02, c. 0.05, d. 0.1, e. 0.2, f. 0.4, g. 0.6, h. 0.8, i. 1.0, j. 1.2, k. 1.4, l. 1.6, m. 1.8, n. 2.0, o. 2.5, p. 3.0; (B) a. 0, b. 0.1, c. 0.2, d. 0.4, e. 0.6, f. 0.8, g. 1.0, h. 1.2, i. 1.4, j. 1.6, k. 1.8, l. 2.0.

Fig.5 Concentrations dependence of ΔA at 446 nm on the Sn2+ concentrationa. MoS2/OPD/H2O2 sensory system, b. OPD/H2O2 sensory system. The inset, a' and b', are the corresponding linear calibration plots.

Table 1 Comparison of detection of tin(Ⅱ) with various analytical methods

Method	Linear range/(μmol·L^-1)	LOD/(μmol·L^-1)	Reference
AAS	0.46—5.64	0.106	[4]
AAS	0.84—50.5	0.350	[5]
Fluorescence	0.076—0.237	0.057	[6]
Fluorescence	1.0—80	0.5	[7]
Fluorescence	0.05—50	0.0257	[8]
Spectrophotometry	16.8—337.0	2.5	[28]
Spectrophotometry	0.33—33.7	0.067	[29]
Colorimetry	0.02—3.0	0.007	This work

Fig.6 UV-Vis absorption spectra for the MoS2/OPD/ H2O2 system in the presence or absence(blank) of different individual metal ions(A) and selectivity of the MoS2/OPD/H2O2 sensory system for Sn2+(B)The concentrations of Sn2+ in (A) and other metal ions are 4.0 μmol/L. Labels a—p represent blank, Sn2+, Na+, K+, Zn2+, Mg2+, Ca2+, Ba2+, Al3+, Mn2+, Cd2+, Pb2+, Hg2+, Co2+, Ni2+ and Ag+, respectively.

Table 2 Determination of Sn2+ spiked in lake samples(n=3)

Sample	Added/(μmol·L^-1)	Found^a/(μmol·L^-1)	Mean recovery^b(%)
1	0.10	0.11± 0.04	110
2	0.05	0.49± 0.06	98
3	1.00	1.02± 0.03	102
4	1.50	1.48± 0.02	99

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