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Method for preparing TiO2 nanocryatal/nanotube composite photocatalyst

A nanotube composite and photocatalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high cost, secondary pollution, etc., and achieve low cost, strong adsorption performance, Environmentally friendly effect

Inactive Publication Date: 2010-08-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has certain limitations due to high cost and easy to cause secondary pollution and other problems.

Method used

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  • Method for preparing TiO2 nanocryatal/nanotube composite photocatalyst
  • Method for preparing TiO2 nanocryatal/nanotube composite photocatalyst
  • Method for preparing TiO2 nanocryatal/nanotube composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] P25 was used as a raw material to prepare titania nanotubes by hydrothermal synthesis. Weigh 0.1g of P25 into NaOH solution with a concentration of 10mol / L, stir until uniform at room temperature, put the mixed solution into a hydrothermal kettle, and react at 110°C for 20-24 hours. Take out the reactor and cool to room temperature, wash the product with deionized water until the pH is 8-9, and then dissolve it in 0.1mol / L HNO 3 In the solution, sonicate for 30 minutes, centrifuge and wash with water for 3-4 times, and finally wash off the water with alcohol, and dry the product at 75° C. for 24 hours to obtain titanium dioxide nanotubes with uniform morphology. figure 1 The transmission electron microscope picture of the titanium dioxide nanotubes prepared in this example shows that the titanium dioxide nanotubes have a diameter of 5-8 nm and a length of 100-200 nm.

Embodiment 2

[0028] Add 0.1 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, take 0.1 g of titanium dioxide nanotubes prepared by hydrothermal synthesis, dissolve them in lower alcohol, and ultrasonicate and stir for 2 minutes each. The solution containing titanium dioxide nanotubes is poured into a crucible, and placed 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 120°C, the heating rate is 10-20°C / min, and keep warm for 10-12 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 75°C for 12 hours. figure 2 Preparation of surface loaded TiO for this example 2 Nanocrystalline TiO2 Nanotube Composite Photo...

Embodiment 3

[0030] Add 0.15 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, take 0.1 g of titanium dioxide nanotubes prepared by hydrothermal synthesis, dissolve them in lower alcohol, and ultrasonicate and stir for 2 minutes each. The solution containing titanium dioxide nanotubes is poured into a crucible, and placed 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 warm for 10-12 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 75°C for 12 hours. image 3 Preparation of surface loaded TiO for this example 2 High-resolution transmission electron microsc...

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Abstract

The invention relates to a method for preparing a TiO2 nanocryatal / nanotube composite photocatalyst, which comprises: (1) preparing titanium dioxide nantotubes by using a hydro-thermalsynthesis method; and (2) dissolving a titanium alkoxide in absolute alcohol, adding the titanium dioxide nantotubes to obtain a homogeneous hybrid solution, placing the hybrid solution in the upper part of a container, adding deionized water in the bottom part of the container, closing the container, heating the closed container to 80 to 150 DEG C, keeping the temperature, pouring out upper powder, and washing and drying the upper powder to obtain the composite photocatalyst. The method of the invention is simple, low in cost, free from post treatment such as high-temperature calcining and suitable for industrial production; and the prepared TiO2 nanocrystal coated titanium dioxide nanotubes have high crystallinity, retain a tubular structure and have high adsorptivity.

Description

technical field [0001] The invention belongs to the field of preparation of titanium dioxide nanotube composite photocatalyst, in particular relates to a kind of TiO 2 Preparation method of nanocrystal / nanotube composite photocatalyst. Background technique [0002] In recent years, environmental pollution has become increasingly serious, and people often use physical adsorption, chemical oxidation, and microbial methods to treat sewage. However, these methods have defects such as low efficiency, high energy consumption, inability to completely detoxify pollutants, and narrow application range. Photocatalytic technology refers to the photocatalyst absorbing sunlight energy to oxidize and reduce harmful substances such as organic pollutants and inorganic pollutants in sewage into CO 2 , H 2 O and other small inorganic molecules or ions, thus not only truly degrading pollutants, but also avoiding secondary pollution. Nano-titanium dioxide is a commonly used semiconductor ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/02C02F1/30B01J35/00
CPCY02W10/37
Inventor 张青红余威威王宏志李耀刚
Owner DONGHUA UNIV
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