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Preparation method of hollow boron/cerium co-doped nanometer titanium dioxide fiber material

A nano-titanium dioxide and fiber material technology, applied in the field of photocatalyst preparation, can solve the problems of easy loss of nano-titanium dioxide particle suspension system, reduced catalyst surface area, low photocatalytic activity, etc., to avoid catalyst loss, easy solid-liquid separation, Simple preparation method

Inactive Publication Date: 2012-10-03
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The photocatalytic activity of nano titanium dioxide is well known, but the current titanium dioxide photocatalyst still has its disadvantages: (1) its band gap is wide, the light absorption is limited to the ultraviolet region, and the photocatalytic activity is low; (2) The suspension system of nano-titanium dioxide particles is easy to lose, and there are problems such as difficulty in recycling, so it has not been widely used in photocatalytic oxidation and wastewater treatment.
Studies have proved that doping modification can effectively broaden the spectral response range of titanium dioxide and improve its photocatalytic activity; by immobilizing titanium dioxide on a certain medium (such as silica gel, polymer membrane, porous aluminum ceramic carrier, etc.) It is easy to separate, but because the immobilization technology is immature, the surface area of ​​the catalyst is reduced, which affects its catalytic activity

Method used

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  • Preparation method of hollow boron/cerium co-doped nanometer titanium dioxide fiber material
  • Preparation method of hollow boron/cerium co-doped nanometer titanium dioxide fiber material

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Embodiment 1

[0026] At room temperature, in a 500 mL three-neck flask equipped with a magnetic stirrer and a dropping funnel, add 20 mL of tetrabutyl titanate dissolved in 40 mL of absolute ethanol, add 10 mL of acetylacetone and 15 mL of ice Acetic acid, then add a mixture of 80 mL absolute alcohol and 15 mL water containing 0.05 g boric acid and 0.33 g cerium ammonium nitrate at a rate of 1 drop / second, continue stirring for 2 h after the dropwise addition, and let stand for 48 h. Weigh 5 g of the pretreated absorbent cotton thread and put it into the prepared 150 mL TiO 2 After soaking in the sol for 48 h, the solvent was evaporated to dryness at 80 °C, dried for 12 h, and then baked in a muffle furnace at 500 °C for 2 h under the protection of nitrogen to obtain an average pore diameter of 22 nm and a specific surface area of ​​230 m 2 / g boron, cerium co-doped nano titanium dioxide hollow fiber material.

[0027] A UV lamp (275 nm) with a power of 20 W was used as the light source to...

Embodiment 2

[0029] At room temperature, in a 500 mL three-neck flask equipped with a magnetic stirrer and a dropping funnel, add 20 mL of tetrabutyl titanate dissolved in 40 mL of absolute ethanol, add 10 mL of acetylacetone and 15 mL of ice Acetic acid, then add a mixture of 80 mL absolute alcohol and 15 mL water containing 0.12 g triethyl borate and 0.26 g cerium nitrate at a rate of 1 drop / second, continue stirring for 2 h after the dropwise addition, and let stand for 48 h. Weigh 5 g of the pretreated absorbent cotton thread and put it into the prepared 150 mL TiO 2 After immersing in the sol for 48 h, the solvent was evaporated to dryness at 80 °C, dried for 12 h, and then calcined at 500 °C for 2 h in a muffle furnace under the protection of nitrogen to obtain an average pore diameter of 20 nm and a specific surface area of ​​238 m 2 / g boron, cerium co-doped nano titanium dioxide hollow fiber material.

[0030] A UV lamp (275 nm) with a power of 20 W was used as the light source t...

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Abstract

The invention provides a preparation method of a hollow boron / cerium co-doped nanometer titanium dioxide fiber material, and relates to the preparation method of a photochemical catalyst. The method comprises the following steps of: preparing the hollow boron / cerium co-doped nanometer titanium dioxide fiber material with large specific surface area and high photocatalytic activity by using an alcoholysis method, doping the boron and the cerium in the preparation process, wherein the doping amount calculated based on the molar ratio of B, Ce and Ti is that the proportion of the B to the Ce to the Ti is (0.1-1.0) to (0.05-1.0) to 10.0. The preparation method provided by the invention has the advantages of available raw materials, simple preparation process and short preparation time; the hollow nanometer titanium dioxide fiber material is obviously increased in the photocatalytic activity after being doped with the boron and the cerium. The prepared co-doped titanium dioxide fiber framework is constituted by anatase nanoparticles less than 50nm with narrow aperture distribution, the average aperture is 20.5nm, the specific surface area is larger than 220 square meters per gram and the photocatalytic activity is high, thus being applicable to the photocatalysis field.

Description

technical field [0001] The invention relates to a preparation method of photocatalyst, in particular to a preparation method of boron and cerium co-doped nano titanium dioxide hollow fiber material. Background technique [0002] Nano-titanium dioxide is a new type of non-toxic and harmless inorganic functional material. It has the advantages of large specific surface area and good light absorption performance. It has been widely used in the fields of catalysts, sensors, fine ceramics and photovoltaic cells. Nano-titanium dioxide can generate photogenerated electrons and holes under the irradiation of ultraviolet light. Photogenerated electrons have strong reducing ability, photogenerated holes have strong oxidizing ability, photogenerated electrons and holes can decompose and purify inorganic substances such as ammonia, amines, and phenols. and organic wastewater, and has a killing effect on bacteria. For example, JP2-9850B discloses the use of titanium dioxide to decompose...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/06
Inventor 石中亮周明涛刘浩郑冬松姚淑华
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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