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Preparation method for infusorial earth/ titanium dioxide composite photocatalyst with nuclear/shell structure

A technology of titanium dioxide and shell structure, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of adsorption performance decline, diatomite pollution, etc., and achieve simple operation, high adsorption performance, The effect of simple preparation method

Inactive Publication Date: 2012-11-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pollution of the surface of diatomite is a problem that needs to be solved in its application process.
Organic matter in the water body will deposit on the surface of diatomite to block its adsorption site, and the adsorption performance will decrease

Method used

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  • Preparation method for infusorial earth/ titanium dioxide composite photocatalyst with nuclear/shell structure
  • Preparation method for infusorial earth/ titanium dioxide composite photocatalyst with nuclear/shell structure
  • Preparation method for infusorial earth/ titanium dioxide composite photocatalyst with nuclear/shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 0.38 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, add 0.1 g of diatomaceous earth powder to the lower alcohol, ultrasonicate and stir for 3 minutes each. Pour an anhydrous alcohol solution containing diatomaceous earth and butyl titanate into a crucible, and then place the crucible on top of a sealable container. The bottom of the sealable container is prefilled with 3 mL of distilled water. After sealing the container, put it into an oven, start heating to 150°C, the heating rate is 10-20°C / min, and keep it warm for 12 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours.

[0036] figure 1 The X-ray diffraction pattern of the diatomite / titanium dioxide composite photocatalyst of the core / sh...

Embodiment 2

[0039] Add 0.19 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, add 0.1 g of diatomaceous earth powder to the lower alcohol, ultrasonicate and stir for 3 minutes each. Pour an anhydrous alcohol solution containing diatomaceous earth and butyl titanate into a crucible, and then place the crucible on top of a sealable container. The bottom of the sealable container is prefilled with 3 mL of distilled water. After sealing the container, put it into an oven, start heating to 200°C, the heating rate is 10-20°C / min, and keep it warm for 6 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours.

Embodiment 3

[0041]0.14 mL of titanium tetrachloride and 8 mL of absolute ethanol were formulated into an alcohol solution of titanium, and 0.1 g of diatomaceous earth powder was added to the above solution, ultrasonic and stirred for 3 minutes each. Pour an anhydrous alcohol solution containing diatomaceous earth and titanium tetrachloride into a crucible, and then place the crucible on top of a sealable container. The bottom of the sealable container is prefilled with 3 mL of distilled water. After sealing the container, put it into an oven, start heating to 150°C, the heating rate is 10-20°C / min, and keep it warm for 12 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours.

[0042] image 3 The X-ray diffraction pattern of the diatomite...

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Abstract

The invention relates to a preparation method for an infusorial earth / titanium dioxide composite photocatalyst with a nuclear / shell structure. The method comprises the steps as follows: (1), precursor of titanium is dissolved in an anhydrous low alcohol to obtain an anhydrous alcohol solution containing titanium; (2), powder of infusorial earth is added in the anhydrous alcohol solution containing titanium obtained in the step (1), and is subjected to ultrasonic treatment and stirred to obtain a uniform mixture; and (3), the uniform mixture is placed in a sealed container, a proper amount of water is placed in the sealed container in advance, the water and the uniform mixture are not in direct contact, the sealed container is heated to 70-200 DEG C, is kept warm for 1-120 hours, and then is cooled to a room temperature after thermal insulation, and powder is obtained, taken out, washed and dried to obtain the infusorial earth / titanium dioxide composite photocatalyst. The preparation method is simple and can be used for mass production; and the composite photocatalyst has a nuclear / shell structure, is high in adsorptive property and photocatalytic efficiency, and can be rapidly recovered through a low energy consumption method like sedimentation or atmospheric pressure filtration after the composite photocatalytic is used in a sewage medium.

Description

technical field [0001] The invention belongs to the field of preparation of titanium dioxide composite photocatalysts, in particular to a preparation method of diatomite / titanium dioxide composite photocatalysts with a core / shell structure. Background technique [0002] In recent years, with the rapid development of the global economy, while enjoying the comfort and convenience brought by technology, human beings are also tasting the bitter fruit of the deteriorating environment. As a serious branch of environmental pollution, water pollution needs to be solved urgently. There are many types of organic matter in sewage, which are highly toxic, harmful and difficult to deal with. Nano-TiO 2 As the most effective photocatalyst currently recognized, it can indiscriminately mineralize organic pollutants in sewage into carbon dioxide, water and other small inorganic molecules or ions, and has shown a very broad application prospect in organic sewage treatment. But how to recove...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J35/02
Inventor 张青红石福志罗蜜王宏志李耀刚
Owner DONGHUA UNIV
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