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High surface area porous spherical structure titanium dioxide nano-particles and preparation method thereof

A titanium dioxide and nanoparticle technology is applied in the field of preparation of porous spherical structure titanium dioxide nanometer photocatalyst, which can solve the problem of low quantum efficiency of titanium dioxide, and achieve the effects of good visible light photocatalytic activity, good economic and social benefits, and low equipment requirements.

Inactive Publication Date: 2018-09-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can solve the problem of low quantum efficiency of existing titanium dioxide

Method used

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  • High surface area porous spherical structure titanium dioxide nano-particles and preparation method thereof
  • High surface area porous spherical structure titanium dioxide nano-particles and preparation method thereof
  • High surface area porous spherical structure titanium dioxide nano-particles and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Dissolve 170 μL tetrabutyl titanate in 20 mL absolute ethanol, stir at room temperature for 5 min, then dissolve 50 μL oleic acid into the mixture of tetrabutyl titanate and absolute ethanol, and stir at room temperature for 15 min , and then under vigorous stirring, 5mL of ionized water was added, and the stirring was continued for 0.5h to obtain a white emulsion, which was finally transferred to a 50ml reaction kettle and heated at 150°C for 12h. Cool to room temperature, wash with ethanol and deionized water respectively, and dry under vacuum at 60°C. The obtained sample is a porous spherical structure titanium dioxide material with a high specific surface area modified with pure anatase phase oleic acid, denoted as OA-TiO 2 . figure 1 It is the X-ray diffraction pattern of the product obtained in this example. It can be seen from the figure that the composition and crystal form of the sample will not be changed after the hydrothermal reaction. figure 2 SEM and TEM...

Embodiment 2

[0038] Dissolve 170 μL of tetrabutyl titanate in 20 mL of absolute ethanol, stir at room temperature for 5 minutes, then dissolve 50 μL of n-heptanoic acid into the mixture of tetrabutyl titanate and absolute ethanol, and stir at room temperature After 15 min, under vigorous stirring, 5 mL of ionized water was added, and the stirring was continued for 0.5 h to obtain a white emulsion, which was finally transferred to a 50 ml reaction kettle and heated in water at 150°C for 12 h. Cool to room temperature, wash with ethanol and deionized water respectively, and dry under vacuum at 60°C. The obtained sample is a porous spherical structure titanium dioxide material with a high specific surface area modified by pure anatase phase oleic acid, which is denoted as HA-TiO 2 .

[0039] Rhodamine B was used to test the photocatalytic performance of the samples. Take 0.05g of the prepared sample and disperse it into 100mL of 10mg / L rhodamine B solution, put the solution in the dark and a...

Embodiment 3

[0041] Dissolve 170 μL tetrabutyl titanate in 20 mL absolute ethanol, stir at room temperature for 5 min, then add 5 mL of ionized water under vigorous stirring, and continue stirring for 0.5 h to obtain a white emulsion, which is finally transferred to a 50 mL reaction kettle Medium, hydrothermal at 150°C for 12h. Cool to room temperature, wash with ethanol and deionized water respectively, and dry under vacuum at 60°C. The obtained sample is a porous spherical structure titanium dioxide material with a high specific surface area modified by pure anatase phase oleic acid, denoted as TiO 2 .

[0042] Rhodamine B was used to test the photocatalytic performance of the samples. Take 0.05g of the prepared sample and disperse it into 100mL of 10mg / L rhodamine B solution, put the solution in the dark and avoid light and stir for 1h to achieve adsorption-desorption equilibrium, then use a 300w xenon lamp equipped with a 420nm filter as the light source, A sample is taken every minu...

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Abstract

The invention belongs to the technical field of titanium dioxide catalyst, and discloses a high surface area porous spherical structure titanium dioxide nano-particles and preparation method thereof,wherein the titanium dioxide particle diameter is 100-200nm, the specific surface area is 500-510m2 / g, is self-assembled from small titanium dioxide nano particles into a large porous spherical three-dimensional structure. The preparation method comprises the following steps: firstly, tetrabutyl titanate is used as a titanium source, an organic acid is used as a surface active agent, and a large amount of small titanium dioxide nano particles are prepared into a porous spherical structure of titanium dioxide in the hydrothermal process. The introduction to the oleic acid and the n-heptanoic acid introduced achieves the self-assembly of the spherical structure, the multi-reflection of the light is realized through the porous spherical structure, and the absorption of light is improved. Meanwhile, the porous spherical structure and the oleic acid are modified to improve the separation of carriers in the photo catalysis process, which enables efficient degradation of phenol and rhodamineB under visible light irradiation.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide catalysts, and relates to the preparation of a porous spherical structure titanium dioxide nano photocatalyst modified with oleic acid and having a very high surface area, which can be used for photocatalytic degradation of organic pollutants under visible light. Background technique [0002] In modern society, a large number of organic compounds from industry, transportation and household products are released into the atmosphere and rivers, and the accumulation of a large number of toxic chemicals leads to air and water pollution. Therefore, designing effective pollution treatment systems can reduce pollutant emissions. Photocatalytic materials have been reported to remove toxic chemicals. Especially titanium dioxide (TiO 2 ) are considered to be excellent solid photocatalytic materials in environmental remediation and solar energy conversion due to their low cost, high activity, good...

Claims

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Application Information

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IPC IPC(8): B01J31/38C02F1/30C02F101/30C02F101/34
CPCC02F1/30B01J31/38C02F2305/10C02F2101/308C02F2101/345B01J35/39
Inventor 谭振权曹俊凯宋学志康晓兰
Owner DALIAN UNIV OF TECH
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