Method for preparing anatase type bentonite-base porous titanium dioxide nano material

A technology of porous titanium dioxide and nanomaterials, which is applied in the fields of titanium dioxide, nanostructure manufacturing, chemical instruments and methods, etc., can solve the problems of difficult control of the operation process, damage to the bentonite structure, corrosion of equipment, etc. The effect of secondary pollution

Inactive Publication Date: 2008-01-16
ZHEJIANG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

These preparation methods are all carried out in an aqueous solution system. The titanium gel is first synthesized and aged, which takes a long time; the preparation process needs to optimize the adjustment of pH value, and the operat

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  • Method for preparing anatase type bentonite-base porous titanium dioxide nano material
  • Method for preparing anatase type bentonite-base porous titanium dioxide nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 100 g of bentonite was mixed with 1000 mL of 0.1084 mol / L cetyltrimethylammonium bromide aqueous solution to prepare organobentonite. Mix the organobentonite after vacuum drying for 12 hours at room temperature according to organobentonite: butyl titanate (mass ratio) = 1:5, stir and react at 50°C for 4 hours; seal the container and wrap it with tin foil to prevent the butyl titanate from being exposed to light. Esterolysis. Separation of solid and liquid, drying of the solid part at 20°C, and finally raising the temperature to 550°C at a rate of 3°C / min in an air atmosphere, and roasting for 6 hours to remove surfactants and adsorbed organic pollutants.

[0024] Sample test description: the product is mainly anatase type, with a particle size of 12.2nm (Figure 1); the specific surface area of ​​the product is 241.25m 2 / g (multi-point BET method), the pore volume is 0.2391cm 3 / g, the average pore size is 3.964nm (Figure 2); the product has a strong ultraviolet effec...

Embodiment 2

[0026] 100 g of bentonite was mixed with 500 mL of 0.1084 mol / L cetyltrimethylammonium bromide aqueous solution to prepare organobentonite. The organobentonite after vacuum drying for 48 hours is first used to adsorb and treat waste water containing 2000mg / L p-nitrophenol. The adsorption capacity of organobentonite to p-nitrophenol is 122mg / g. After the organic bentonite of phenol is dried, mix according to organic bentonite: isopropyl titanate (mass ratio) = 1:22, stir and react at 20° C. for 8 hours; seal the container and wrap it with tin foil to prevent the decomposition of isopropyl titanate under light. Separation of solid and liquid, drying of the solid part at 80°C, and finally raising the temperature to 550°C at a rate of 2°C / min in an air atmosphere, and roasting for 6 hours to remove surfactants and adsorbed organic substances.

[0027] Sample test description: The product is mainly anatase, with a particle size of 14.4nm; the specific surface area of ​​the product ...

Embodiment 3

[0029] 100 g of bentonite was mixed with 1000 mL of 0.1084 mol / L cetyltrimethylammonium bromide aqueous solution to prepare organobentonite. Mix organic bentonite and co-surfactant after vacuum drying for 2 hours according to organic bentonite: dodecylamine = 1: 0.5 (mass ratio), stir and react at 50°C for 30 minutes; (Mass ratio) = 1:5 mixed, stirred and reacted at 20° C. for 8 hours; airtight container, wrapped with tin foil to prevent decomposition of butyl titanate under light. Separation of solid and liquid, drying of the solid part at 100°C, and finally raising the temperature to 700°C at a rate of 3°C / min in an air atmosphere, and roasting for 2 hours to remove surfactants and adsorbed organic pollutants.

[0030] Sample test description: The product is mainly anatase, with a particle size of 9.7nm; the specific surface area of ​​the product is 169.94m 2 / g (multi-point BET method), the pore volume is 0.2956cm 3 / g, the average pore size is 7.082nm; the product has a ...

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Abstract

The present invention discloses a preparation method for an anatase type bentonite-based porous TiO2 nanometer material. The preparation method is that the organic bentonite after dehydration and drying or the organic bentonite abandoned after wastewater treatment is added with the mixture of amine and titanate or only added with titanate; then after well mixing and centrifuging, the supernate is abandoned and the solid part left will be removed from surfactant and organic materials through drying and high-temperature calcinations, thus the porous TiO2 nanometer material is obtained. The material prepared by the invention is of large specific surface area, smaller grain size, single particle size and uniform pore distribution, wherein, the aperture ranges between micropore and mesopore and the pores are in high sequence degree. The material is mainly anatase type and is provided with relatively high catalytic activity, which can be applied to the indoor organic pollutant purification field. At the same time, the present invention provides a very good solution to the ultimate disposition of abandoned organobentonite, and makes good use of the abandoned organobentonite after wastewater treatment to achieve the treatment of a waste with another waste. The preparation method is of low energy consumption, simple preparation process, optimal pH control and no need of acid, which is suitable for large-scale engineering applications.

Description

technical field [0001] The invention belongs to the technical field of porous nanomaterials, and in particular relates to a preparation method of anatase-type bentonite-based porous titanium dioxide nanomaterials. In particular, a method for preparing porous titanium dioxide nanomaterials by using organic bentonite or organic bentonite discarded after organic wastewater treatment as the main clay raw material and providing cationic surfactants. Background technique [0002] Nano-titanium dioxide material is a research hotspot in the field of materials and catalysis, and it shows unique advantages in catalytic degradation of organic pollutants in water and air. Since the discovery of irradiated TiO by Fujishima et al. in 1972 2 Since the continuous oxidation-reduction reaction occurred on the surface, scholars set off an upsurge of research on photocatalysis (ZhaoJ, Yang XD. Building and Environment. 2003, 38, 645-654). This technology can oxidize many organic pollutants su...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J20/06B82B3/00
Inventor 朱利中屈芳杨坤吕金泽
Owner ZHEJIANG UNIV
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