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
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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]

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
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Example Embodiment

[0024] Example 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 and obtain a mixed solution A; Add the mixed solution A dropwise to the above graphene oxide dispersion under magnetic stirring, continue stirring for half an hour to obtain the mixed precursor solution B; weigh 0.426 g Na 2 HPO 4 Dissolve the solid in 20 ml of deionized water to obtain a disodium hydrogen phosphate solution. Add the prepared disodium hydrogen phosphate solution dropwise to the mixed precursor solution B under stirring until the reaction system appears grayish green and turbid, and the addition is complete After the mixed solution was stirred for 30 minutes and then allowed to stand for aging, the product was centrifuged and washed repeatedly with absolute ethanol and deionized water, and then dried in vacu...

Example Embodiment

[0027] Example 2-12

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

[0029] Table 1

[0030] Example Graphene oxide quality P25 quality Phosphate type Phosphate quality Example 2 50 mg 300 mgNa 2 HPO 4 0.426 g Example 3 20 mg 400 mgNa 2 HPO 4 0.426 g Example 4 50 mg 400 mgNa 2 HPO 4 0.426 g Example 5 20 mg 600 mgNa 2 HPO 4 0.426 g Example 6 50 mg 600 mgNa 2 HPO 4 0.426 g Example 7 20 mg 300 mgNaH 2 PO 4 0.36 g Example 8 50 mg 300 mgNaH 2 PO 4 0.36 g Example 9 20 mg 400 mgNaH 2 PO 4 0.36 g Example 10 50 mg 400 mgNaH 2 PO 4 0.36 g Example 11 20 mg 600 mgNaH 2 PO 4 0.36 g Example 12 50 mg 600 mgNaH 2 PO 4 0.36 g Example 13 20 mg 300 mgNa 3 PO 4 0.49 g Example 14 50 mg 300 mgNa 3 PO 4 0.49 g Example 15 20 mg 400 mgNa 3 PO 4 0.49 g Example 16 50 mg 400 mgNa 3 PO 4 0.49 g E...

Example Embodiment

[0031] Example 19

[0032] The composite materials prepared in Examples 1-18 were co-cultured with Escherichia coli, Staphylococcus aureus, Bacillus pumilus, and Pseudomonas aeruginosa, and tested for plate method, minimum inhibitory concentration and minimum bactericidal concentration. The test method was operated in accordance with the "Disinfection Technical Specifications" of the Ministry of Health of the People's Republic of China, and the bacteria 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 People’s Republic of China industry standards stipulate: when the diameter of the compound inhibition zone is less than 7 ml, it can be regarded as non-bacterial; when the inhibition zone is between 7-10mm, it is weak. Antibacterial activity; when the diameter of the inhibition zone is between 10-20mm, the antibacterial activity is better; if the diame...

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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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