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

A technology of mixing rare earths and carbonates, applied in chemical instruments and methods, catalyst activation/preparation, nanotechnology for materials and surface science, etc., can solve the problem of uneven nucleation and growth of titanium oxide, complex preparation process, extraction Inconvenient to use and other problems, to achieve the effect of easy adjustment of doping ratio, low price and convenient access

Active Publication Date: 2018-11-30
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 based on mixed rare-earth carbonates, and preparation method of material
  • Lanthanum-cerium co-doped titanium oxide material based on mixed rare-earth carbonates, and preparation method of material
  • Lanthanum-cerium co-doped titanium oxide material based on mixed rare-earth carbonates, and preparation method of material

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 particularly relates to a lanthanum-cerium co-doped titanium oxide material based on mixed rare-earth carbonates, and a preparation method of the material. The method comprises the following steps: firstly, weighing a certain amount of a titanium-containing sulfate, dissolving the titanium-containing sulfate in distilled water, adding a mixed rare-earth carbonate solution with a controlled proportion, then adjusting the pH value of the system to be acidic, carrying out a reaction in a water bath, and then carrying out calcining in a muffle furnace, so that the hydrolysis growth, crystallization and effective doping of titanium oxide are realized, and the obtained nano material has excellent visible light catalysis performance. The method is simple in process and cheap in raw materials, is free of organic additives and organic titanium sources, and is low in environmental cost and high in product cost performance, large-scale industrial production can be realized, and the obtained product has a wide application prospect in the fields of photocatalytic degradation, organic pollutant treatment and the like.

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 Applications(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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