Applications of high-purity Ag-loaded TiO2 mesoporous nanofiber as high-efficiency photocatalyst

A technology of nanofibers and photocatalysts, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrogen production, etc., can solve the problem of low specific surface area, poor stability, and superiority of composite materials To achieve the effects of high sensitivity, stable quality, and enhanced photocatalytic performance

Inactive Publication Date: 2015-10-28
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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  • Applications of high-purity Ag-loaded TiO2 mesoporous nanofiber as high-efficiency photocatalyst
  • Applications of high-purity Ag-loaded TiO2 mesoporous nanofiber as high-efficiency photocatalyst
  • Applications of high-purity Ag-loaded TiO2 mesoporous nanofiber as high-efficiency photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 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 Figur...

Embodiment 2

[0060] 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 50ml of deionized water, followed by about 2.0g 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 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 1.26at%; the results of Comparative Example 1 sho...

Embodiment 3

[0063] 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 applications of high-purity Ag-loaded TiO2 mesoporous nanofiber as a high-efficiency photocatalyst. The high-purity Ag-loaded TiO2 mesoporous nanofiber is mainly composed of Ti, O, and Ag; the main existence form of Ti and O element in the high-purity Ag-loaded TiO2 mesoporous nanofiber is TiO2; Ag is a load element; and the high-purity Ag-loaded TiO2 mesoporous nanofiber possesses a porous structure with holes including mesoporous. A preparation method of the high-purity Ag-loaded TiO2 mesoporous nanofiber is simple; production is convenient; product quality is stable; catalytic efficiency of the high-purity Ag-loaded TiO2 mesoporous nanofiber in water photolysis is high; and performance is stable.

Description

technical field [0001] The invention relates to the application of an inorganic semiconductor photoelectric material in the field of photocatalysts, especially high-purity Ag-loaded TiO 2 Application of fully mesoporous nanofibers in highly efficient photocatalysts. [0002] Mesoporous material refers to a material with a porous structure and a pore diameter between 2 and 50 nanometers; at% atomic percent. Background technique [0003] 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 photogen...

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 杨为佑侯慧林
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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