One-step synthesis method of nitrogen and sulfur co-doped titanium dioxide/graphene quantum dot heterojunction
A technology of graphene quantum dots and titanium dioxide, applied in chemical instruments and methods, chemical/physical processes, water treatment of special compounds, etc., can solve the problems of multi-energy and consumption, and achieve the effect of small loss rate and favorable catalytic performance
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0025] Preparation of nitrogen, sulfur co-doped titanium dioxide, nitrogen, sulfur co-doped graphene quantum dot composite NSTG (2:1)
[0026] (1) According to the ratio of the molar ratio of citric acid to thiourea of 2:1, weigh 0.42 g of citric acid and 0.08 g of thiourea.
[0027] (2) Add the powder weighed in step 1 to 8 ml of dimethylformamide solution in sequence, and stir quickly until it is completely dissolved.
[0028] (3) Weigh 100 mg of titanium dioxide (P25) powder, slowly add it to the solution obtained in step 2, and stir quickly to a suspension.
[0029] (4) Transfer the suspension obtained in step 3 to a 40ml reactor and react at 180°C for 6 hours.
[0030] (5) Naturally cool to room temperature, remove the reaction kettle, centrifuge the precipitate at 8,500 rpm for 20 minutes, and obtain a gray sample.
[0031] (6) Wash the sample obtained in step 5 with ethanol twice at 8500 rpm for 10 minutes, and discard the supernatant to obtain the sample.
[0032] (7) Wash the s...
Embodiment 2
[0037] In Example 1, the step 1 was changed to: According to the molar ratio of citric acid to thiourea of 1:1, weigh 0.42 g of citric acid and 0.15 g of thiourea. The remaining steps are the same as in Example 1. Finally, the sample NSTG (1:1) was prepared. The photocatalytic degradation dye performance test process is the same as step 9 of Example 1.
[0038] image 3 This is the TEM image of the sample prepared in Example 2. At low magnification, it can be seen that the nitrogen and sulfur doped titanium dioxide exists in the form of nanoparticles, and the nitrogen and sulfur doped graphene quantum dots are tightly attached due to their small size (about 5nm) On the surface of titanium dioxide, a heterojunction is formed. At high resolution, you can clearly see the exposed (101) crystal plane of titanium dioxide. Due to the heterojunction, the (1120) crystal plane of nitrogen and sulfur doped graphene quantum dots is closely connected, and the two crystal planes are synerg...
Embodiment 3
[0041] In Example 1, the step 1 was changed to: according to the molar ratio of citric acid to thiourea of 1:3, weigh 0.42 g of citric acid and 0.46 g of thiourea. The remaining steps are the same as in Example 1. Finally, the sample NSTG (1:3) was prepared. The photocatalytic degradation dye performance test process is the same as step 9 of Example 1.
[0042] Figure 4 It is the high-resolution characterization of N 1s and S 2p of the sample prepared in Example 2. Under the high resolution of N 1s, 399.2, 399.7, 400.3, and 401.3 eV correspond to CNC, O-Ti-N, NH, Ti-ON bonding, respectively. In S 2p high resolution, 163.6, 164.7, 168.3, 169.6eV correspond to S 2p respectively 3 / 2 , S 2p 1 / 2 , S=O, SO bonding. It is proved from the side that the sample prepared in Example 3 is a heterojunction of nitrogen-sulfur-doped titanium dioxide and nitrogen-sulfur-doped graphene quantum dots, and there is a strong chemical bond between the heterojunctions It is helpful to improve the s...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More