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Lanthanum-cerium co-doped titanium oxide material and preparation method based on mixed rare earth carbonate

A mixed rare earth and carbonate technology, applied in chemical instruments and methods, catalyst activation/preparation, nanotechnology for materials and surface science, etc. In order to achieve the effect of easy adjustment of doping ratio, low price, and reduced difficulty

Active Publication Date: 2021-04-16
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention overcomes the problems of expensive raw materials, inconvenient access, complicated preparation process, uneven nucleation and growth of titanium oxide, and poor crystallinity in the existing synthesis technology. Hydrolysis, rare earth element doping ratio, and calcination activation process to obtain nano-photocatalytic functional materials with high crystallinity, uniform particle growth, and active response to visible light

Method used

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  • Lanthanum-cerium co-doped titanium oxide material and preparation method based on mixed rare earth carbonate
  • Lanthanum-cerium co-doped titanium oxide material and preparation method based on mixed rare earth carbonate
  • Lanthanum-cerium co-doped titanium oxide material and preparation method based on mixed rare earth carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 3.6 g of titanium sulfate, add 50 mL of distilled water to prepare a 0.3 mol / L titanium sulfate solution, and then magnetically stir for 30 min.

[0027] (2) Under the condition of stirring, mix the mixed rare earth carbonate solution into the precursor solution obtained in step (1), so that the lanthanum, cerium and TiO in the mixed solution 2 The molar percentages are 1.5% and 0.5%, respectively. After fully stirring, the pH value of the mixed liquid is adjusted to 1 with 2 mol / L sodium hydroxide solution, followed by magnetic stirring for 1 h.

[0028] (3) Place the emulsion obtained in step (2) in a water bath, and treat it in a water bath for 5 hours at a constant temperature of 90° C. under magnetic stirring conditions. After cooling, the emulsion was centrifuged several times to remove free CO 3 2- , SO 4 2- ions, the resulting white precipitate was dried at 80°C for 3 hours, and the powder sample obtained after grinding was calcined in a muffle fur...

Embodiment 2

[0030] (1) Weigh 1.6 g of titanyl sulfate, add 50 mL of distilled water to prepare a 0.2 mol / L titanium sulfate solution, and then magnetically stir for 30 min.

[0031](2) Under the condition of stirring, mix the mixed rare earth carbonate solution into the precursor solution obtained in step (1), so that the lanthanum, cerium and TiO in the mixed solution 2 The molar percentages of the mixtures were 1% and 1%, respectively. After fully stirring, the pH value of the mixed liquid was adjusted to 3 with 2mol / L ammonia solution, followed by magnetic stirring for 2h.

[0032] (3) Place the emulsion obtained in step (2) in a water bath, and treat it in a water bath for 2 hours at a constant temperature of 60° C. under magnetic stirring conditions. After cooling, the emulsion was centrifuged several times to remove free CO 3 2- , SO 4 2- ions, the resulting white precipitate was dried at 100°C for 4 hours, and the powder obtained after grinding was calcined in a muffle furnace ...

Embodiment 3

[0034] (1) Weigh 8 g of titanyl sulfate, add 50 mL of distilled water to prepare a 1 mol / L titanium sulfate solution, and then magnetically stir for 30 min.

[0035] (2) Under the condition of stirring, mix the mixed rare earth carbonate solution into the precursor solution obtained in step (1), so that the lanthanum, cerium and TiO in the mixed solution 2 The molar percentages of the mixtures were 3% and 2%, respectively. After fully stirring, the pH value of the mixed liquid was adjusted to 5 with 2mol / L ammonia solution, followed by magnetic stirring for 3h.

[0036] (3) Place the emulsion obtained in step (2) in a water bath, and treat it in a water bath for 8 hours at a constant temperature of 30°C under magnetic stirring. After cooling, the emulsion was centrifuged several times to remove free CO 3 2- , SO 4 2- ions, the resulting white precipitate was dried at 120°C for 5 hours, and the powder obtained after grinding was calcined in a muffle furnace at 700°C for 4 h...

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Abstract

The invention belongs to the field of inorganic material synthesis, and in particular relates to a lanthanum-cerium co-doped titanium oxide material based on mixed rare earth carbonate and a preparation method. First, weigh a certain amount of titanium-containing sulfate, dissolve it in distilled water, and mix it into the mixed rare earth carbonate solution in a controlled proportion, then adjust the pH value of the system to acidic, react in a water bath, and then calcined in a muffle furnace to achieve titanium oxide. The hydrolytic growth, crystallization and effective doping of the obtained nanomaterials have excellent visible light catalytic performance. The process is simple, the raw materials are cheap, no organic additives and organic titanium sources are used, the environmental cost is low, and the product is cost-effective, and large-scale industrial production can be realized. The obtained products have wide applications in the fields of photocatalytic degradation and organic pollutant treatment. prospect.

Description

technical field [0001] The invention belongs to the field of inorganic nanomaterials, and relates to a rare earth element co-doped titanium oxide photocatalytic functional material and a preparation method thereof, in particular to a method of preparing lanthanum-cerium co-doped titanium oxide by using mixed rare earth carbonate, so that the titanium oxide Obtain higher visible light catalytic ability. Background technique [0002] Nano-scale anatase titanium dioxide has a large band gap and has a good effect of ultraviolet photocatalytic degradation of organic pollutants. However, the relative content of ultraviolet light in natural light is relatively small (only 3% to 5%), which is harmful to solar energy. Utilization is low. In addition, the specific surface area of ​​anatase titanium dioxide powder is small, the dispersion is poor, and the electrons and holes generated by photoexcitation are easy to recombine, resulting in low photon quantum efficiency and low catalyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J37/03B01J37/08B82Y30/00B82Y40/00
CPCB01J23/10B01J35/004B01J37/033B01J37/082B82Y30/00B82Y40/00
Inventor 李芳菲韩明磊蒋引珊薛兵夏茂盛雒锋任桂花董智强张立功于春生
Owner JILIN UNIV
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