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Ag/TiO2-N visible-light catalyst, and supercritical alcohol-heating preparation method and application thereof

A photocatalyst and visible light technology, applied in physical/chemical process catalysts, chemical instruments and methods, botanical equipment and methods, etc., can solve the problem that Ag particles cannot be loaded synchronously, the probability of carrier recombination is increased, and the particle size is difficult to control. and other problems, to achieve the effect of simple and easy preparation method, uniform distribution and good stability

Active Publication Date: 2015-11-25
SHANGHAI NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, Ag / TiO can be obtained by different methods 2 -N photocatalysts, but all require an external reducing agent or reduction potential, and cannot simultaneously load Ag particles and dope N elements, so the bonding between different species is weak, the particle size is difficult to control and easy to agglomerate, resulting in carrier The recombination probability increases, which is not conducive to improving the photocatalytic efficiency

Method used

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  • Ag/TiO2-N visible-light catalyst, and supercritical alcohol-heating preparation method and application thereof
  • Ag/TiO2-N visible-light catalyst, and supercritical alcohol-heating preparation method and application thereof
  • Ag/TiO2-N visible-light catalyst, and supercritical alcohol-heating preparation method and application thereof

Examples

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specific Embodiment approach

[0028] A Ag / TiO 2 -N visible photocatalyst, the crystal form of titanium dioxide is pure anatase phase, the particle size is 2.0-3.0μm, and the specific surface area is 140-169m2 / g.

[0029] The supercritical alcohol thermal preparation method of Ag / TiO2-N visible light catalyst comprises the following steps:

[0030] (1), TiO 2 Preparation of nanoparticles: Add tetrabutyl titanate to the ethanol solution and stir, then place the solution in a supercritical kettle, and inject ethanol into the kettle, after the supercritical reaction, wash the obtained product with ethanol and deionized water Dry to get TiO 2 Nanoparticles;

[0031] (2), Ag / TiO 2 -N visible photocatalyst preparation: Weighing AgNO 3 Add it into ultrapure water, add ammonia solution drop by drop, make silver ammonia solution and add it to TiO 2 The ethanol suspension is placed in a supercritical kettle, and ethanol is injected into the kettle. After the supercritical reaction, it is naturally cooled to roo...

Embodiment 1

[0039] Add 10mL tetrabutyl titanate to 30mL ethanol solution and stir for 30min, then place the solution in a 500mL supercritical kettle (such as figure 1 ), which includes a kettle lining 3, and a heating furnace 4 is arranged on the outside of the kettle lining, and the kettle lining is sealed by a sealing cover, and a temperature sensing rod 2 and a pressure gauge 1 are fixed on the sealing cover, and The temperature and pressure in the lining of the kettle were monitored by temperature sensing rods and pressure gauges, and 170mL of ethanol was injected into the kettle, and the temperature was raised to 240°C and kept for 70 minutes at a heating rate of 2°C / min. The obtained product was washed three times with ethanol and deionized water respectively, then centrifuged and dried at 80° C. for 24 hours. TiO nanospheres can be obtained 2 . Weigh 0.046gAgNO 3 Add it to 10mL ultrapure water, add 0.8mL ammonia solution drop by drop, and add it to 30mL TiO 2 In ethanol suspens...

Embodiment 2

[0042] No AgNO was added during preparation 3 , the rest of the content is the same as that described in Example 1, that is, to obtain spherical TiO 2 -N photocatalyst. figure 2 The XRD collection of illustrative plates of middle present embodiment shows that obtained TiO 2 The -N photocatalyst is an anatase crystal phase without impurities. The specific surface area of ​​the present embodiment is 169m 2 / g. Figure 5 This example has a certain catalytic activity in the catalytic degradation of methyl orange under visible light. Figure 9 In this example, there is no obvious photocatalytic killing performance on Acinetobacter baumannii under visible light.

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Abstract

The invention discloses an Ag / TiO2-N visible-light catalyst. A titanium dioxide crystal form is of a pure anatase phase; a particle size is 2.0 [mu]m to 3.0 [mu]m; and a specific surface area is 140 to 169 m2 / g. The invention also discloses a preparation method for the Ag / TiO2-N visible-light catalyst. The method comprises the following steps: (1) preparation of TiO2 nanometer particles; and (2) preparation of the Ag / TiO2-N visible-light catalyst. The invention also provides application of a visible light responding photocatalyst in preparation of a photocatalytic organic-pollutant degradation agent and an antibacterial agent. Compared with the prior art, the invention has the following beneficial effects: raw materials used in the preparation method are simple and easily available; the preparation method is simple, convenient and easily implementable; the prepared micron spherical Ag / TiO2-N visible light responding photocatalyst has the advantages of uniform distribution of Ag nanometer particles on the surface of TiO2, low carrier recombination rate, high photocatalytic activity and good stability; meanwhile, the preparation process does not need any reducing agent, so generation of pollutant by-products is avoided, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of semiconductor photocatalytic materials, and relates to the synthesis of micron spherical Ag / TiO by supercritical alcohol thermal technology 2 Preparation and application of -N visible photocatalyst. Background technique [0002] With the rapid development of global industry, environmental problems have become increasingly prominent. Photocatalytic technology is favored because it can use solar energy to solve environmental pollution problems. At the same time, semiconductor photocatalysis technology has outstanding advantages such as high efficiency, low energy consumption, mild reaction conditions, wide application range and reduction of secondary pollution. Among them, titanium dioxide has become a research hotspot due to its high photocatalytic activity, high stability, safety and non-toxicity, and has broad application prospects in wastewater treatment, antibacterial self-cleaning, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B82Y30/00B82Y40/00C02F1/30A01N59/16A01P1/00C02F101/34C02F101/38
CPCY02W10/37
Inventor 霍宇凝尹海波罗柳林侯如静朱慧娟高媛李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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