Preparation method of high-purity Ag-loading TiO2 full-mesoporous nanofiber

A nanofiber and high-purity technology, which is applied in the field of preparation of inorganic semiconductor photoelectric materials, can solve the problems of composite materials such as ineffective use of superiority, poor stability, and low specific surface area, and achieve enhanced photocatalytic performance, stable quality, The effect of high sensitivity

Inactive Publication Date: 2015-11-04
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been a lot of research work on Ag-modified TiO 2 have been reported, but existing preparation methods synthesized Ag-loaded TiO 2 Photocatalysts are often nano-powder structures, which still have defects such as low specific surface area and poor stability, making Ag-loaded TiO 2 The superiority of composite materials cannot be effectively utilized

Method used

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  • Preparation method of high-purity Ag-loading TiO2 full-mesoporous nanofiber
  • Preparation method of high-purity Ag-loading TiO2 full-mesoporous nanofiber
  • Preparation method of high-purity Ag-loading TiO2 full-mesoporous nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 0.7g of polyvinylpyrrolidone (PVP) and 4.0g of butyl titanate (TBOT) and dissolve them in a mixture of 7ml of absolute ethanol and 3ml of glacial acetic acid, stir and mix at room temperature for 10 hours, then add 0.4g of azodicarboxylate Isopropyl ester (foaming agent, DIPA) was continuously stirred for 1 hour to obtain a precursor spinning solution. After the spinning solution was left to stand, 6ml was measured and injected into a plastic needle tube, and placed on a micro-injection pump, and the injection speed was set at 1ml / h. The metal needle was used as the electrospinning anode, and the barbed wire was used as the cathode of the receiving material. The distance between the anode and the cathode was 20 cm. Electrospinning was performed at a high voltage of 15kV to prepare organic precursor fiber materials. Then the organic precursor fiber material is placed in a 60°C constant temperature oven to obtain a solid organic precursor fiber ( figure 1 and fig...

Embodiment 2

[0054] TiO 2 The preparation of all mesoporous nanofibers is the same as in Example 1, and the prepared TiO 2 Fully mesoporous nanofibers were dispersed in 50 ml of deionized water, followed by about 2.0 g of AgNO 3 Added to the above suspension to make Ag + The concentration is 0.24mol / L, under the condition of continuous stirring, the light is irradiated for 2h, after centrifugation, filtration and drying, the Ag-loaded TiO 2 Scanning electron microscopy (SEM) images of mesoporous nanofibers at different magnifications and magnifications are shown in Figure 11 and Figure 12 shown. Figure 11 The illustration in is the particle size distribution diagram of Ag nanoparticles, and the analysis and calculation shows that the average particle size is 42.8nm. Figure 13 Loading TiO for Ag 2The energy spectrum (EDS) of all mesoporous nanofibers is mainly composed of Ti, O and Ag elements, and the atomic ratio of Ag elements is 1.26at%; the results of Comparative Example 1 sh...

Embodiment 3

[0057] TiO 2 The preparation of all mesoporous nanofibers is the same as in Example 1, and the prepared TiO 2 Fully mesoporous nanofibers were dispersed in 50 ml of deionized water, followed by about 3.0 g of AgNO 3 Added to the above suspension to make Ag + The concentration is 0.36mol / L, under the condition of continuous stirring, the light is irradiated for 2h, after centrifugation, filtration and drying, the Ag-loaded TiO 2 Scanning electron microscopy (SEM) images of mesoporous nanofibers at different magnifications and magnifications are shown in Figure 14 and Figure 15 shown. Figure 14 The illustration in is the particle size distribution diagram of Ag nanoparticles. According to analysis and calculation, the average particle size is 68.9nm. Figure 16 Loading TiO for Ag 2 The energy spectrum (EDS) of all mesoporous nanofibers is mainly composed of Ti, O and Ag elements, and the atomic ratio of Ag elements is 2.14at%; the results of comparative example one and ...

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Abstract

The invention discloses a preparation method of high-purity Ag-loading TiO2 full-mesoporous nanofiber. The method comprises the following steps: (1) a precursor spinning solution is prepared, wherein polyvinylpyrrolidone, butyl titanate, isopropyl azodicarboxylate are dissolved in a mixed solvent of anhydrous ethanol and glacial acetic acid, such that a uniform precursor spinning solution is obtained; (2) precursor nanowires are prepared, wherein the precursor spinning solution obtained in the step (1) is prepared into the precursor nanowires through spinning; (3) nanowires are prepared, wherein the precursor nanowires obtained in the step (2) are subjected to high-temperature calcination, such that TiO2 full-mesoporous nanofiber is obtained; (4) Ag nanoparticles are loaded through photo-deposition, wherein the TiO2 full-mesoporous nanofiber obtained in the step (3) is uniformly dispersed in a solvent containing soluble silver salt; illumination is carried out under stirring, such that photo-deposition is carried out; and post-treatment is carried out, such that the high-purity Ag-loading TiO2 full-mesoporous nanofiber is obtained. The nanofiber preparation method has the advantages of simple process, convenient production, and good product quality stability. When the nanofiber is used in water photolysis, the catalytic effect is high, and the property is stable.

Description

technical field [0001] The invention relates to a preparation method of an inorganic semiconductor optoelectronic material, especially a high-purity Ag-loaded TiO 2 Preparation method of fully mesoporous nanofibers. Background technique [0002] TiO 2 It has the advantages of stable chemical properties, non-toxicity, and rich sources of raw materials, and is widely used in many fields such as environmental protection, chemical industry, electrical appliances, solar cells, and medicine. where TiO 2 The application of materials in photocatalytic technology is one of the current research hotspots, such as the use of TiO 2 The photocatalytic activity degrades organic pollutants in water, sterilizes, and produces hydrogen by photolysis of water. However, pure phase TiO 2 The photogenerated electron-hole pairs generated during the photocatalytic reaction of the material are very easy to recombine, and the photocatalytic efficiency is low. In view of this, researchers have us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50C01B3/04
CPCY02E60/36
Inventor 高凤梅侯慧林杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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