A kind of preparation method and application of visible light catalyst

A catalyst and visible light technology, applied in chemical instruments and methods, botanical equipment and methods, physical/chemical process catalysts, etc., can solve the problems of limited photocatalytic activity and low light utilization efficiency, and achieve good catalytic effect and good sterilization Effect, the effect of improving the ability to absorb visible light

Active Publication Date: 2020-05-01
JIANGSU UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

However, pure g-C 3 N 4 Among them, the disadvantages of low utilization efficiency of visible light and rapid recombination of photogenerated electron pairs still limit the further improvement of its photocatalytic activity.

Method used

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  • A kind of preparation method and application of visible light catalyst
  • A kind of preparation method and application of visible light catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) g-C 3 N 4 preparation of

[0028] Weigh a certain amount of urea into a porcelain boat, and use a porcelain boat of the same size to buckle it upside down, so that the urea is in a relatively sealed environment. Then the porcelain boat was placed in a tube furnace, and the temperature was raised to 550°C at a rate of 5°C / min under the protection of nitrogen, and calcined for 4h. Finally, it was naturally cooled to room temperature to obtain a light yellow solid, which was then ground in an agate mortar to obtain g-C3N4 powder.

[0029] (2) Au / Ag / g-C 3 N 4 preparation of

[0030] Measure 0.157mL of silver nitrate (AgNO 3 ) and 0.836mL of chloroauric acid (HAuCl 4 ) solution together into the beaker, then measure 5ml of polyvinyl alcohol (PVA) solution into the beaker, and magnetically stir at room temperature to obtain a uniform solution. Then weigh the g-C prepared in 2g step (1) 3 N 4 Powder was added to the solution and stirring was continued for 1 hour....

Embodiment 2

[0034] With embodiment 1, only change the volume of the silver nitrate solution measured in embodiment 1 step (2) to be 0.079mL, 0.314mL; The volume of corresponding chloroauric acid solution is 0.418mL, 1.672mL. That is, the prepared Au / Ag / g-C 3 N 4 Ag and g-C in powder 3 N 4 The mass fraction is 0.25wt.% and 1wt.%; the corresponding Au and g-C 3 N 4 The mass fractions are 1wt.% and 4wt.%. The bactericidal efficiency of the prepared catalysts is shown in Table 1. The results showed that the greater the loading of Ag and Au nanoparticles, the better the efficiency of visible light catalytic sterilization.

[0035] Table 1 The effect of different loadings of noble metal nanoparticles on the catalytic sterilization efficiency of the obtained visible light catalyst

[0036] Noble metal loading (Ag, Au, wt.%) Bactericidal efficiency (%) 0.25，1 70 0.5，2 85 1，4 92

Embodiment 3

[0038] Same as Example 1, only the amount of catalyst used in step (3) of Example 1 is changed to 0, 50, 100 μg, that is, the final catalyst concentration is 0, 10, 20 μg / mL. The resulting bactericidal efficiencies are shown in Table 2. The results showed that with the increase of the amount of catalyst used, the efficiency of its visible light catalytic sterilization also increased. This is because the amount of catalyst increases, and more ROS are released after light exposure, so it is easier to kill bacteria.

[0039] Table 2 Effect of different catalyst concentrations on visible light catalytic sterilization efficiency

[0040] Catalyst concentration (μg / mL) Bactericidal efficiency (%) 0 5 10 62 20 73 40 85

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Abstract

The invention relates to a preparation method and an application for a visible-light photocatalyst, belonging to the field of preparation of environmental materials. The invention specifically relatesto the preparation method for an Au and Ag nanoparticle modified g-C3N4 catalyst (Au / Ag / g-C3N4), and sterilization of the Au and Ag nanoparticle modified g-C3N4 catalyst under visible-light irradiation. The preparation method mainly comprises the following steps: (1) preparation of g-C3N4 powder; (2) preparation of Au / Ag / g-C3N4 powder; and (3) visible-light catalysis sterilization. According to the invention, Au and Ag nanoparticles are loaded on the surface of g-C3N4, so the ability of absorbing visible light is improved; and good catalysis effect of the catalyst can be generated under sunlight irradiation, so energy consumption is reduced, and good sterilization effect is achieved at the same time.

Description

technical field [0001] The invention relates to a preparation method and application of a visible light catalyst, in particular to g-C modified with Au and Ag nanoparticles 3 N 4 Catalyst (Au / Ag / g-C 3 N 4 ) preparation method and its sterilization under visible light irradiation, which belong to the field of environmental material preparation. Background technique [0002] Photocatalytic technology is a green technology with important application prospects in the fields of energy and environment. As a natural phenomenon, photocatalysis has been widely studied and applied in the fields of electrochemistry, photochemistry, catalytic chemistry and biochemistry. In 1972, Fujiehima and others published "Electrochemical photolysis of water at asemiconductor electrode" in Nature, which opened the prelude to a new era of photocatalysis. In the following decades, photocatalytic technology has received widespread attention, and several important research directions have been form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24A01N59/16A01N59/00A01P1/00
Inventor 冯永海武荣荣刘磊张杰董明东
Owner JIANGSU UNIV
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