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A kind of preparation method of agcl/ag core-shell structure nano-visible photocatalyst

A core-shell structure, visible light technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of limited processing capacity, low utilization of sunlight, and power consumption, etc., and achieve simple and convenient preparation methods. Easy-to-promote effect

Inactive Publication Date: 2019-05-10
TONGHUA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The earliest semiconductor photocatalyst that received attention was titanium dioxide. However, the intrinsic characteristics of titanium dioxide have limitations in its practical application. For example, titanium dioxide has a large band gap (3~3.2V) and can only absorb ultraviolet light, while solar energy Only 4~5% of ultraviolet light reaches the earth's surface, so the utilization of sunlight is very low
Usually, when titanium dioxide is used as a catalyst, a special ultraviolet light source such as a high-pressure mercury lamp is required, which not only consumes electric energy, but also has high requirements on the entire photocatalytic equipment because ultraviolet rays are harmful to the human body, thus limiting the processing capacity.

Method used

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  • A kind of preparation method of agcl/ag core-shell structure nano-visible photocatalyst
  • A kind of preparation method of agcl/ag core-shell structure nano-visible photocatalyst
  • A kind of preparation method of agcl/ag core-shell structure nano-visible photocatalyst

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Experimental program
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Embodiment

[0028] (1) Add 1 mL of concentrated hydrochloric acid to 20 mL of deionized water, add 0.2 g of chitosan and stir for 1 hour to completely dissolve it, the concentration of the concentrated hydrochloric acid is 36%;

[0029] (2) Add silver nitrate to make the concentration 0.1 mol•L-1, stir well and then add α-alanine to make the concentration 0.2 mol•L-1;

[0030] (3) After continuing to stir for 1 hour, the reaction system was left to stand for 12 hours, and the obtained purple precipitate was centrifuged and washed twice with deionized water for further use. These purple precipitates are characterized by transmission electron microscopy, and an obvious asymmetric core-shell structure can be seen, such as figure 1 .

[0031] (4) All steps are completed at ambient temperature, and the ambient temperature is 15°C to 25°C.

Embodiment 2

[0033] (1) Add 1.5 mL of concentrated hydrochloric acid to 20 mL of deionized water, add 0.3 g of chitosan and stir for 2 hours to completely dissolve it. The concentration of concentrated hydrochloric acid is 36%;

[0034] (2) Add silver nitrate to make the concentration 0.15 mol L-1, stir well and then add α-alanine to make the concentration 0.3 mol L-1;

[0035] (3) After continuing to stir for 1 hour, let the reaction system stand still for 12 hours, suck off the supernatant with a straw, then add 20 mL of deionized water, continue to stand after stirring for 5 minutes, and repeat the above operation twice to achieve the product cleaning. The resulting purple precipitate was centrifuged and washed twice with deionized water for further use. The morphology of these purple products is characterized by transmission electron microscopy, and an obvious core-shell structure can be seen, such as figure 2 .

[0036] (4) All steps are completed at ambient temperature, and the a...

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Abstract

The invention discloses a method for preparing AgCl / Ag nanomaterials with an asymmetric core-shell structure. The main technical principles adopted are as follows: utilizing the characteristic that chitosan is only soluble in acidic media, it is dissolved in deionized water containing hydrochloric acid. , then add a certain concentration of silver nitrate solution to form nanoscale AgCl under the template of chitosan macromolecules, and then introduce a certain amount of α-aminopropionic acid into the system to utilize the reducing properties of α-aminopropionic acid. Part of AgCl is converted into Ag elemental substance and grown on the surface of AgCl to form a core-shell nanostructure. The present invention has the advantages of simple and easy preparation method, does not require special equipment, and is easier to promote, and the entire preparation system is made of non-toxic materials. material composition.

Description

technical field [0001] The invention relates to a preparation method of a visible light catalyst, in particular to a preparation method of an AgCl / Ag core-shell structure nanometer visible light catalyst. Background technique [0002] The rapid development of global industrialization has also brought about increasingly serious environmental pollution, from air to water to soil. Therefore, pollution control has become the focus of widespread attention at home and abroad, and it is also one of the current research hotspots in the field of science and technology. Traditional sewage treatment methods include physical chemical method and biological method. Although both have certain effects, they also have some shortcomings to varying degrees. For example, the former generally has high treatment costs and is prone to secondary pollution, while the latter is not efficient in the treatment of refractory organic matter. Therefore, it is an urgent need for all environmental workers t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/10C02F1/30B01D53/86
CPCB01D53/86C02F1/30B01J27/10C02F2305/10B01D2255/802B01J35/39Y02W10/37
Inventor 董丽红管桂芝魏轩赵兴隆
Owner TONGHUA NORMAL UNIV