Method for preparing nitrogen-doped rutile TiO2 selective photocatalyst

A photocatalyst and nitrogen-doped technology, which is applied in the direction of light water/sewage treatment, oxidized water/sewage treatment, textile industry wastewater treatment, etc. It can solve the problems that cannot pass through, organic molecules are difficult to achieve selectivity, and cannot be degraded. , to achieve the effect of preferential and selective catalysis

Inactive Publication Date: 2013-03-13
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0004] 1) Prepare the photocatalyst into a mesoporous structure, or load it on a mesoporous template, so that organic molecules with a molecular size larger than the mesoporous cannot pass through the mesopores and adsorb on the surface of the photocatalyst, so they cannot be degraded. Can achieve selective photodegradation of different organic substances with large molecular size differences, but no selectivity for organic substances with similar molecular sizes
[0005] 2) The surface of the photocatalyst is modified by chemical methods, and different groups are attached to the surface to make it have different electrical properties in aqueous solution, so that the separation of organic substances with different electrical properties (positive or negative) can be achieved. However, it has no selective effect on organic compounds with the same hydrolytic conductivity
[0006] Based on the above discussion, it can be seen that the current selective photocatalysis scheme is more limited, and it is difficult to achieve selectivity for organic molecules with molecular sizes close to each other. In addition, the efficiency of selectivity needs to be improved.

Method used

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  • Method for preparing nitrogen-doped rutile TiO2 selective photocatalyst
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  • Method for preparing nitrogen-doped rutile TiO2 selective photocatalyst

Examples

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Effect test

Embodiment 1

[0026] 0.39Kg titanium nitride and 4L concentration of 10M HNO 3 1. Mix 1 L of HCl with a concentration of 10M to form a precursor, and place it in a hydrothermal reaction kettle at a constant temperature of 180°C for 24 hours; perform solid-liquid centrifugation on the solid-liquid mixture after the hydrothermal reaction, pour out the liquid product, and take out the solid product , washed with deionized water three times and then dried at 80°C for 10 hours; the dried product was sintered at 600°C for 90 minutes; the sintered product was ground into powder to obtain nitrogen-doped rutile TiO 2 nanorod.

Embodiment 2

[0028] 0.39Kg titanium nitride and 5L concentration of 10M HNO 3 1. Mix 1 L of HCl with a concentration of 10M to form a precursor, and place it in a hydrothermal reaction kettle at a constant temperature of 180°C for 27 hours; perform solid-liquid centrifugation on the solid-liquid mixture after the hydrothermal reaction, pour out the liquid product, and take out the solid product , washed with deionized water three times and then dried at 80°C for 13 hours; the dried product was sintered at 600°C for 100 minutes; the sintered product was ground into powder to obtain nitrogen-doped rutile TiO 2 nanorod.

Embodiment 3

[0030] 0.39Kg titanium nitride and 5L concentration of 10M HNO 3 2. Mix 2L of HCl with a concentration of 10M to form a precursor, and place it in a hydrothermal reaction kettle at a constant temperature of 190°C for 30 hours; perform solid-liquid centrifugation on the solid-liquid mixture after the hydrothermal reaction, pour out the liquid product, and take out the solid product , washed 4 times with deionized water and dried at 90°C for 16 hours; the dried product was sintered at 700°C for 100 minutes; the sintered product was ground into powder to obtain nitrogen-doped rutile TiO 2 nanorod.

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Abstract

The invention relates to a method for preparing a nitrogen-doped rutile TiO2 selective photocatalyst. The method disclosed by the invention comprises a step of mixing titanium nitride with nitric acid and hydrochloric acid to prepare a nitrogen-doped rutile TiO2 nanorod by hydrothermal reaction for selective photodegradation of an organic matter. An experiment confirms that the nitrogen-doped rutile TiO2 nanorod has selective photodegradation effect on methyl orange in a mixed aqueous solution system of methylene blue and the methyl orange, and illustrates that the nitrogen-doped rutile TiO2 nanorod has selective photodegradation capacity on the organic matters with approximate molecular dimensions, and the degradation capacity is from an unsaturated chemical bond formed by surface nitrogen-doped atoms. A new way for achieving selective photodegradation is developed by the invention.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped rutile TiO 2 A method for nanorod selective photocatalysis. Background technique [0002] Selective photodegradation means that the photocatalyst has different photocatalytic degradation rates for different organic substances, and can preferentially degrade certain organic substances in the mixture, while other organic substances can be retained. Selective photodegradation can be used in organic separation, fine chemical synthesis and other aspects. Selective photodegradation is a challenging chemical problem because photocatalytic degradation mainly relies on semiconductor photocatalysts (such as TiO 2 ) after absorbing photons to generate free hydroxyl·OH, the redox potential energy of free hydroxyl·OH reaches 2.8 eV, which can degrade most of the organic matter, which leads to its basically no photodegradation selectivity. [0003] At present, some methods to achieve selective photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/72C02F1/30C02F103/30
Inventor 张峻付伟席俊华季振国
Owner HANGZHOU DIANZI UNIV
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