Preparation method for titanium oxynitride photocatalyst

A photocatalyst, titanium oxynitride technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems that have not been reported, and achieve the effect of simple preparation method and excellent hydrogen production activity

Inactive Publication Date: 2012-02-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, nano-nitrogen-doped TiO has been prepared from titanium nitride (TiN) powder in the presence of an oxidizing agent. 2 The work has been reported[12,13], but the preparat

Method used

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  • Preparation method for titanium oxynitride photocatalyst
  • Preparation method for titanium oxynitride photocatalyst
  • Preparation method for titanium oxynitride photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 : Disperse 0.2 g TiN powder in 30 mL 0.03 mol / L HF-0.1 mol / L H 2 o 2 In aqueous solution (TiN with oxidants HF and H 2 o 2 The molar ratios were 2.6 and 1.0), stirred evenly, and then transferred to a 100 mL hydrothermal kettle and kept in an oven at 180°C for 12 h. After cooling, the obtained samples were washed with deionized water until neutral, and dried to obtain a white Powder, XRD test shows that all TiN is transformed into anatase TiO 2 powder, such as figure 1 A(a); shows that in HF-H 2 o 2 TiN can be transformed into TiO in the system 2 . Scanning electron microscope results showed that the obtained powder was nanoparticles, such as figure 2 as shown in a.

[0020] Adsorption performance test. Accurately weigh 5 mg of the prepared catalyst into a glass reactor, and add 40 mL of 5 mg / mL methylene blue solution. The system was placed in a dark state and stirred for 4 h under magnetic stirring to make it reach adsorption equilibrium. Th...

Embodiment 2

[0023] Example 2: Disperse 0.2 g TiN in 30 mL containing 0.03 mol / L HF and 0.1 mol / L H 2 o 2 5 mol / L sodium hydroxide aqueous solution (the molar ratio of TiN to concentrated alkali is 0.02, and the oxidants HF and H 2 o 2 The molar ratios were 2.6 and 1.0), stirred evenly, and then transferred to a 100 mL hydrothermal kettle and kept in an oven at 180°C for 12 h. After cooling, the obtained samples were washed with deionized water until neutral, and dried to obtain gray Fluffy powder, XRD test shows that part of TiN is transformed into a new phase titanium oxynitride (TiN x o y ),Such as figure 1 Shown in A(b); scanning electron microscopy results show that the obtained powder has a three-dimensional chrysanthemum-like structure, such as figure 2 as shown in b. Indicates that the existence of strong base has an effect on the conversion of TiN to TiO 2 shape played an important role.

[0024] Adsorption performance test. Accurately weigh 5 mg of the prepared catal...

Embodiment 3

[0027] Example 3: Disperse 0.2 g TiN in 30 mL containing 0.03 mol / L HF and 0.1 mol / L H 2 o 2 10 mol / L sodium hydroxide aqueous solution (the molar ratio of TiN to concentrated alkali is 0.01, and the oxidants HF and H 2 o 2 The molar ratios were 2.6 and 1.0), stirred evenly, and then transferred to a 100 mL hydrothermal kettle and kept in an oven at 180°C for 12 h. After cooling, the obtained samples were washed with deionized water until neutral, and dried to obtain a white Fluffy powder, XRD test shows that almost all TiN is transformed into a new phase titanium oxynitride (TiN x o y ),Such as figure 1 Shown in A(c); scanning electron microscopy results show that the obtained powder has a three-dimensional chrysanthemum-like structure, such as figure 2 as shown in c. Indicates that the existence of strong base has an effect on the conversion of TiN to TiO 2 shape played an important role.

[0028] Adsorption performance test. Accurately weigh 5 mg of the prepare...

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Abstract

The invention specifically reveals a preparation method for a titanium oxynitride photocatalyst, which belongs to the technical field of chemical engineering of titanium dioxide photocatalysts. The method comprises the following steps: uniformly mixing TiN powder and concentrated alkali, adding an oxidizing agent and homogenizing an obtained mixture with stirring so as to obtain a mixed emulsion;transferring the mixed emulsion to a hydro-thermal kettle and allowing the mixture to maintain a temperature of 150 to 200 DEG C for 6 to 18 h so as to obtain a sample; rinsing the sample with deionized water until the sample is neutral and drying the sample so as to obtain the titanium oxynitride photocatalyst which is chrysanthemum powder. The oxidation degree of titanium oxynitride can be controlled by adjusting the concentration of alkali, hydro-thermal time, hydro-thermal temperature or the concentration of the oxidizing agent. The preparation method provided in the invention is simple. According to results of photocatalysis tests, the chrysanthemum-like titanium oxynitride prepared by the method has excellent activity of photocatalytic degradation of methylene blue and photocatalytic decomposition of water into hydrogen.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide photocatalysis chemical industry, and in particular relates to a preparation method of titanium oxynitride photocatalyst. Background technique [0002] With the aggravation of the global energy crisis and environmental deterioration, the technology of using semiconductor photocatalytic degradation of organic pollutants and photocatalytic water splitting to produce hydrogen has attracted great attention due to its simple operation and no pollution. So far, TiO 2 Semiconductors are currently the most widely studied photocatalytic materials, and they have broad application prospects in the fields of photocatalytic degradation of organic matter, sterilization, sewage treatment, air purification, and photocatalytic water splitting to produce hydrogen. But TiO 2 It is a wide-bandgap semiconductor, which only responds to ultraviolet light and the shortcomings of photogenerated carriers such as...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00
Inventor 张晓艳崔晓莉
Owner FUDAN UNIV
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