Synthesis method of supported silver iodide nanoparticle visible light photocatalyst

A nanoparticle, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of easy deactivation, unstable visible light photocatalytic performance, etc. Easy to synthesize in large quantities and improve the effect of photocatalytic performance

Inactive Publication Date: 2012-08-15
WUHAN UNIV OF TECH
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Problems solved by technology

[0003] According to our current research results: the visible light photocatalytic performance of bulk silver iodide photocatalyst is unstable and has the disadvantage of easy deactivation

Method used

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  • Synthesis method of supported silver iodide nanoparticle visible light photocatalyst
  • Synthesis method of supported silver iodide nanoparticle visible light photocatalyst
  • Synthesis method of supported silver iodide nanoparticle visible light photocatalyst

Examples

Experimental program
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Embodiment 1

[0033] The synthesis method of supported silver iodide nanoparticles visible light photocatalyst comprises the following steps: 1) Preparation of silver tungstate nanorods: under room temperature, 40 milliliters of 0.01 moles / liter silver nitrate solution is added to 40 milliliters of 0.005 moles / liter tungsten NaCl solution, let it stand for 12 hours, and then washed the precipitate with deionized water for 3 times to obtain silver tungstate nanorods with a length of 0.5-2 microns and a diameter of 20-100 nanometers; 2) dissolving potassium iodide in deionized A uniform solution was formed in ionized water, and the pH value of the solution was adjusted to 6 with nitric acid; 3) Put 1 gram of Ag 2 WO 4 Add the nanorods to 25 ml of 0.002-0.2 mol / L potassium iodide solution, stir evenly, let stand in a dark room at room temperature for 2 hours, filter the yellow precipitate, wash the product 3 times with deionized water and absolute ethanol, and finally in Dry at 40° C. for 2 hou...

Embodiment 2

[0042] In order to test the influence of iodide ion concentration on the morphology and photocatalytic performance of supported silver iodide nanoparticles, the reaction conditions were the same as in Example 1 except that the concentration of potassium iodide was different. The results showed that when the concentrations of potassium iodide were 0.001, 0.002, 0.04, 0.1 and 0.2 mol / L, the degradation rate constants of AgI samples to methyl orange were 0.005, 0.013, 0.033, 0.018 and 0.001 min, respectively -1 . The main reason is that when the concentration of potassium iodide is 0.001 mol / L, only a small amount of AgI nanoparticles are loaded on the surface of silver tungstate nanorods due to the low concentration of iodide ions, and the photocatalytic degradation performance is low; when the concentration of potassium iodide is 0.002-0.1 mol / L, because AgI nanoparticles can be well loaded on the surface of silver tungstate nanorods, showing high photocatalytic activity (such ...

Embodiment 3

[0045] In order to examine the impact of the pH value of potassium iodide solution on the morphology and photocatalytic performance of loaded silver iodide nanoparticles, the concentration of potassium iodide solution (0.04 mol / liter), except that the pH value of potassium iodide solution is different, other reaction conditions are all with embodiment 1 same. The results show that when the pH value of the potassium iodide solution is 2, the silver tungstate nanorods can be converted into tungstic acid, which destroys the nanorod structure and cannot obtain the loaded AgI nanoparticle photocatalyst; when the pH value of the potassium iodide solution is 5 and 7, the morphology of the resulting supported silver iodide nanoparticle photocatalyst is similar to figure 1 and showed high catalytic performance for the degradation of methyl orange, with degradation rate constants of 0.034 and 0.032 min, respectively -1 ; When the pH value of the potassium iodide solution was 11, silver...

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Abstract

The invention relates to a synthesis method of a supported silver iodide nanoparticle visible light photocatalyst, which comprises the following steps: adding 1g of Ag2WO4 nanorods into a prepared 25ml potassium iodide solution, stirring uniformly, standing in a dark room at room temperature for 1-24 hours, filtering to obtain a yellow precipitate, respectively washing with deionized water and anhydrous alcohol, and finally, carrying out vacuum drying to obtain the supported silver iodide nanoparticle visible light photocatalyst. The invention is very simple to operate: the silver tungstate nanorod are added into the prepared potassium iodide solution at room temperature, and the solution is kept for some time without adding various organic surface active agents, additives, templates and the like; since the whole reaction process only needs beakers and other common glass apparatuses, so the facility request is low; and the invention does not need various expensive processing and synthesizing facilities or high-temperature high-pressure reactors, and can easily implement mass synthesis.

Description

technical field [0001] The invention relates to a synthesis method of a supported silver iodide nano particle visible light photocatalyst. technical background [0002] Compared with bulk powder materials, nanomaterials have attracted more and more attention from scientists because of their unique optical, physical and chemical properties. With the development of ultra-fine materials, the surface electrons and crystal structure of materials have changed, resulting in four major effects that bulk materials do not have: quantum effects, size effects, surface effects, and interface effects. Due to the existence of the four major effects, nanomaterials have higher specific surface area and quantum efficiency, making them have superior performance than corresponding bulk materials. Therefore, the research trend of photocatalysts is nanoscale visible light photocatalytic materials. In recent years, silver halide has been considered as a promising new visible-light photocatalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J37/30C02F1/30
Inventor 余火根刘莉王雪飞王苹
Owner WUHAN UNIV OF TECH
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