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A nitrogen-doped tio 2 Method of powder preparation
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A nitrogen-doped, copper plate technology, applied in the field of materials, can solve the problems of poor sample morphology and long sintering time, and achieve the effects of improving the degradation rate, shortening the sintering time, and enhancing the photocatalytic activity.
Active Publication Date: 2020-01-14
LIAONING TECHNICAL UNIVERSITY
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[0003] Preparation of nitrogen-doped TiO 2 The resistance furnace sintering method is adopted, which requires gradient heating, long sintering time, and poor sample morphology
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Embodiment 1
[0030] 10 mL of tetramethylammoniumhydroxide was added dropwise to 30 mL of absolute ethanol under stirring, and then continued to stir for 25 min to obtain a colorless and transparent mixed solution;
[0031] 70 mL of isopropyltitanate was added dropwise to the mixed solution under stirring to obtain a colorless and translucent sol; the total dropping time was controlled to be 10 min;
[0032] Immerse the copper plate in the bottom of the sol, age it for 10 hours, and then dry it at 60°C for 22 hours, and then take out the copper plate covered with colloid; the thickness of the colloid on the surface of the copper plate is 2mm;
[0033] Direct current is applied to the copper plate covered with colloid, the current is controlled to be 500A, the energization time is 25min, and the colloid on the surface is sintered by the heating of the copper plate;
[0034] After the sintering is completed, scrape off the sintered material on the surface of the copper plate, and the scrape...
Embodiment 2
[0037] The method is the same as the embodiment, the difference lies in:
[0038] (1) 15mL of tetramethylammoniumhydroxide was added dropwise to 40mL of absolute ethanol under stirring, and then continued to stir for 10min;
[0039] (2) 75mL of isopropyltitanate was added dropwise to the mixed solution, and the total dropwise addition time was 12min;
[0040] (3) Aged for 11h, then dried at 70℃ for 21h, the thickness of the colloid on the surface of the copper plate is 2.4mm;
[0041] (4) The power-on current is 550A, and the power-on time is 20min;
[0042] (5) Nitrogen-doped TiO 2 The average particle size of the powder is 130nm;
[0045] The method is the same as the embodiment, the difference lies in:
[0046] (1) 20mL of tetramethylammonium hydroxide was added dropwise to 35mL of absolute ethanol under stirring, and then continued to stir for 15min;
[0047] (2) 78mL of isopropyl titanate was added dropwise to the mixed solution, and the total dropwise addition time was 14min;
[0048] (3) Aged for 12h, then dried at 75°C for 20h, the thickness of the colloid on the surface of the copper plate is 2.8mm;
[0049] (4) The power-on current is 560A, and the power-on time is 18min;
[0050] (5) Nitrogen-doped TiO 2 The average particle size of powder is 100nm;
[0051] (6) Through the photocatalytic degradation test, the photocatalytic degradation rate reaches 85%.
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Abstract
A kind of nitrogen-doped TiO 2 The preparation method of the powder belongs to the field of material technology and includes the following steps: (1) dropwise adding tetramethylammoniumhydroxide into absolute ethanol and stirring to obtain a mixed solution; (2) dropwise adding isopropyltitanate into the mixture In the liquid, a sol is obtained; (3) Immerse the copper plate at the bottom of the sol, dry it at 60-80°C after aging, and take it out; (4) Pass direct current to the copper plate, and use the heat generated by the copper plate to sinter the colloid on the surface; (5) Sintering After completion, scrape off the sintered material on the surface of the copper plate. The scraped off material is nitrogen-doped TiO. 2 pink. The synthesis process of the present invention is simple, the reaction conditions are mild, the sample sintering time is greatly shortened, the sample shape after sintering is better, the structure is more stable, and the prepared nitrogen-doped TiO 2 The degradation rate of methylene blue is significantly improved.
Description
technical field [0001] The invention belongs to the technical field of materials, in particular to a nitrogen-doped TiO 2 Method for preparing powder. Background technique [0002] TiO 2 Photocatalysts have broad application prospects in the treatment of polluted wastewater due to their stable chemical properties, controllable preparation cost, non-toxicity, and the availability of sunlight and no secondary pollution. 2 When used as a photocatalyst, due to the wide band gap, it can only absorb photons with a length of less than 387 nm, and the high photo-generated electron-hole recombination rate leads to low quantum yield and low photocatalytic efficiency, which greatly limits its practical application. Therefore, methods such as metaliondoping, anion doping, compounding of different semiconductors, and noble metal modification are often used to improve TiO 2 photocatalytic activity. By doping, photogenerated electron-hole recombination can be effectively suppressed. ...
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