Detection method of sulfur ions
A detection method and technology for sulfide ions, which are applied in measuring devices, instruments, fluorescence/phosphorescence, etc., can solve the problems of accelerated corrosion and wear of pump impellers, sulfide stress cracking, plant root poisoning, etc. Good relationship and low cost effect
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Embodiment 1
[0027] A detection method for sulfide ions, characterized in that it comprises the following steps:
[0028] S1. Mix 1 mL of carbon quantum dot solution with chitosan as carbon source and 32 mL of MnO with a concentration of 54 μM 2 Solution mixing of nanosheets to construct carbon quantum dots / MnO 2 Nanosheet fluorescent probe solution;
[0029] S2, towards carbon quantum dots / MnO 2 Add different final concentrations of sulfide ion aqueous solutions to the nanosheet fluorescent probe solution, react for 2 hours, and then test the fluorescence spectra of each system at an excitation wavelength of 344nm, as shown in figure 1 shown; and take the sulfur ion concentration as the abscissa, and the fluorescence intensity value of the system at 420nm as the ordinate to plot, as figure 2 shown, from figure 2 It can be seen that with the increase of sulfur ion concentration, the carbon quantum dots / MnO 2 The fluorescence intensity of the nanosheets gradually recovers; and has a ...
Embodiment 2
[0034] MnO 2 The Effect of Nanosheet Solution Concentration on the Fluorescence Intensity of Carbon Quantum Dots
[0035] After adding 32 mL of manganese dioxide nanosheet solutions of different concentrations in the range of 0 to 117 μM to 1 mL of the carbon quantum dot solution obtained in Example 1, the fluorescence spectrum of the test system at an excitation wavelength of 344 nm, as shown in Figure 5 As shown, then take the concentration of manganese dioxide nanosheets as the abscissa, and the fluorescence intensity of the system at a wavelength of 420nm as the ordinate, as Image 6 shown. from Figure 5 with 6 It can be seen that the solution of carbon quantum dots has a strong fluorescence at 420nm, adding MnO 2 After adding nanosheets, the fluorescence of the system is rapidly quenched. And the fluorescence intensity of the system will vary with the MnO 2 The concentration of nanosheets increases and gradually decreases.
Embodiment 3
[0037] Carbon quantum dots / MnO 2 Discussion on the Detection Mechanism of Nanosheet Fluorescent Probes for Sulfide Ions
[0038] In order to study the mechanism of system fluorescence quenching, the present invention continues to study MnO 2 The ultraviolet absorption spectrum of the nanosheet and the fluorescence excitation spectrum of the carbon quantum dots at the emission wavelength of 420nm and the emission spectrum at the excitation wavelength of 344nm, such as Figure 7 shown. from Figure 7 It can be seen that the MnO 2 Nanosheets have a wide ultraviolet absorption band in the range of 200nm to 600nm, as shown in curve c in the figure, with a peak at 380nm. In detection, the reason for such a high quenching efficiency is that the excitation spectrum b and emission spectrum a of carbon quantum dots are just in line with the prepared MnO 2 The UV absorption spectra of the nanosheets have a large part of the overlap, which means that the MnO 2 The nanosheets will ab...
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