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Graphene oxide/silver phosphate/P25 composite material and preparation method thereof

A composite material and silver phosphate technology, applied in chemical instruments and methods, botanical equipment and methods, chemical/physical processes, etc., can solve the problem of large size of silver phosphate materials, reduced recombination rate of photogenerated carriers, and low quantum efficiency and other problems, to achieve the effect of widening the response range of visible light, improving the utilization rate of sunlight, and simple and easy process route

Inactive Publication Date: 2013-01-09
JIANGSU UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Titanium dioxide has gained widespread attention as a semiconductor photocatalytic material. However, titanium dioxide has a narrow light absorption range (only limited to the ultraviolet region), low quantum efficiency, and especially its low response to visible light, resulting in limited photocatalytic activity under visible light irradiation; Guo Wait[ Nat Mater , 2010 , 9 , 559-564] reported that under the excitation of visible light, due to the dispersed energy band structure of silver phosphate, the forbidden band width is relatively narrow, the recombination rate of photogenerated carriers is greatly reduced, and the quantum efficiency is greatly improved. Thereby showing excellent visible light photocatalytic activity; In addition, as a silver compound, silver phosphate also has good bactericidal activity, but the preparation of silver phosphate uses a silver-containing compound, which makes the preparation cost high, and the prepared The size of silver phosphate materials is too large and the shape is difficult to control
[0004] P25 is a mixed titanium dioxide material of rutile type and anatase type. Studies have shown that its response to visible light is poor. Through the effective compounding of silver phosphate and P25, we have constructed a silver phosphate / P25 heterostructure with micro-nano structure to further broaden the The absorption and utilization efficiency of the material for visible light, combined with the structural characteristics of graphene oxide such as large specific surface area, many hydrophilic functional groups, and good dispersion and solubility, the size and shape of the preparation can be controlled, with high-efficiency visible light photocatalytic performance and excellent bactericidal activity. Multifunctional composite materials; currently, graphene oxide / silver phosphate / P25 composites are prepared by charge-driven self-assembly solution ion exchange method using graphene oxide, silver nitrate, silver phosphate and P25 as raw materials and applied to photocatalysis Degradation of organic pollutants and sterilization has not been reported

Method used

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  • Graphene oxide/silver phosphate/P25 composite material and preparation method thereof
  • Graphene oxide/silver phosphate/P25 composite material and preparation method thereof
  • Graphene oxide/silver phosphate/P25 composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse 20 mg of graphene oxide in 50 ml of deionized water and sonicate for 5 hours to obtain a graphene oxide dispersion, weigh 1.529 g of silver nitrate and 300 mg of P25 and dissolve them in 50 ml of deionized water for 30 minutes to obtain a mixed solution A; Add the mixed solution A dropwise to the above-mentioned graphene oxide dispersion under magnetic stirring, and continue stirring for half an hour to obtain the mixed precursor solution B; weigh 0.426 g Na 2 HPO 4 The solid was dissolved in 20 ml of deionized water to obtain a disodium hydrogen phosphate solution, and the prepared disodium hydrogen phosphate solution was added dropwise to the mixed precursor solution B under agitation until gray-green turbidity appeared in the reaction system, and the addition was completed After that, the mixed solution was continuously stirred for 30 minutes and left to stand for aging. After the product was centrifuged, it was repeatedly washed with absolute ethanol and de...

Embodiment 2-12

[0028] The difference between the following examples and Example 1 is that the quality of graphene oxide used, the quality of P25, the type of phosphate and the quality are different, as shown in Table 1, and the rest are the same as described in Example 1.

[0029] Table 1

[0030] Example Graphene Oxide Quality P25 Quality Phosphate type Phosphate mass Example 2 50mg 300mg Na 2 HPO 4 0.426 g Example 3 20mg 400mg Na 2 HPO 4 0.426 g Example 4 50mg 400mg Na 2 HPO 4 0.426 g Example 5 20mg 600mg Na 2 HPO 4 0.426 g Example 6 50mg 600mg Na 2 HPO 4 0.426 g Example 7 20mg 300mg NaH 2 PO 4 0.36 g Example 8 50mg 300mg NaH 2 PO 4 0.36 g Example 9 20mg 400mg NaH 2 PO 4 0.36 g Example 10 50mg 400mg NaH 2 PO 4 0.36 g Example 11 20mg 600mg NaH 2 PO 4 0.36 g Example 12 50mg 600mg NaH 2 PO 4 0.36 g Example 13 ...

Embodiment 19

[0032] The composite materials prepared in Examples 1-18 were co-cultured with Escherichia coli, Staphylococcus aureus, Bacillus pumilus and Pseudomonas aeruginosa respectively, and the plate method, minimum inhibitory concentration and minimum bactericidal concentration tests were carried out. The test method was operated in accordance with the "Technical Specifications for Disinfection" of the Ministry of Health of the People's Republic of China, and the strains used were provided by the School of Pharmacy, Jiangsu University.

[0033] Table 2

[0034]

[0035] The results of the plate method inhibition zone test are shown in Table 2. The industry standard of the People's Republic of China stipulates that when the diameter of the compound inhibition zone is less than 7 milliliters, it can be considered as having no antibacterial effect; when the inhibition zone is between 7-10 mm, it is weak. Antibacterial activity; the antibacterial activity is better when the diam...

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Abstract

The invention discloses a graphene oxide / silver phosphate / P25 composite material and a preparation method thereof, and belongs to the technical field of composites and photocatalysis for environmental management. The preparation method includes steps of dissolving graphene oxide into water to obtain graphene oxide dispersion under ultrasonic treatment; ultrasonically dispersing silver phosphate and P25 into deionized water to obtain mixed solution, adding the mixed solution into the graphene oxide dispersion drop by drop while stirring so as to obtain a mixed precursor; dripping a prepared phosphate solution into the mixed precursor of the graphene oxide, the silver phosphate and the P25 slowly while stirring continuously so as to obtain a celadon product through reaction, centrifugally separating the celadon product, washing the product with the deionized water and absolute ethyl alcohol multiple times, and drying the product in vacuum so as to obtain the composite material. The graphene oxide / silver phosphate / P25 composite material prepared by the method has high photocatalysis degradation effect to organic dye Rhodamine-B after being initiated by visible light, and also has excellent broad-spectrum bactericidal activity to various common bacteria.

Description

technical field [0001] The present invention relates to a graphene oxide / silver phosphate / P25 composite material and a preparation method thereof, in particular to a method for preparing graphene oxide / silver phosphate / P25 composite material by a solution system ion exchange method based on charge self-assembly, belonging to Composite materials, photocatalytic materials, environmental protection materials and pollution control and other fields. Background technique [0002] Titanium dioxide has gained widespread attention as a semiconductor photocatalytic material. However, titanium dioxide has a narrow light absorption range (only limited to the ultraviolet region), low quantum efficiency, and especially its low response to visible light, resulting in limited photocatalytic activity under visible light irradiation; Guo wait[ Nat Mater , 2010 , 9 , 559-564] reported that under the excitation of visible light, due to the dispersed energy band structure of silver phosphate, ...

Claims

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Application Information

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IPC IPC(8): B01J27/18C02F1/30A01N59/16A01P1/00
Inventor 杨小飞崔海英李扬唐华刘恒秦洁玲张蓉仙高庆侠
Owner JIANGSU UNIV
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