MnOx-MOF-Gr composite material and preparation method and application thereof

A technology of mnox-mof-gr and composite materials, applied in the field of composite materials, can solve problems such as poor formaldehyde removal effect, and achieve the effects of improving adsorption performance, improving catalytic oxidation performance, and simple preparation process

CN110270379AActive Publication Date: 2019-09-24SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-09-24

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Abstract

The invention discloses a MnOx-MOF-Gr composite material and a preparation method and application thereof. The method comprises the steps that 1, manganese chloride and para toluic acid are dissolved in a mixed solution of water and N,N-dimethylformamide, a hydrothermal reaction is conducted at 100-160 DEG C, and after the reaction is completed, treatment is conducted to obtain a Mn-MOFs crystal material; 2, the Mn-MOFs crystal material is added to a graphene dispersion solution, and dispersion is even; 3, the mixed solution obtained in step 2 and an oxidant aqueous solution are mixed at 20-60 DEG C and react to obtain the MnOx-MOF-Gr composite material. The prepared composite material has a high specific surface area, contains rich surface adsorbed oxygen species and can quickly and effectively degrade low-concentration formaldehyde at the room temperature, the preparation technology is simple and saves energy, any precious metal does not need to be added, the material cost is low, and large-scale production can be achieved.
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Description

technical field

[0001] The invention relates to a composite material, in particular to a MnO x -MOF-Gr (manganese oxide-metal organic framework compound-graphene) composite material and its preparation method and application. Background technique

[0002] With the wide application of formaldehyde as an industrial raw material in interior furniture materials and car interior decoration materials in modern life, the problem of formaldehyde pollution in the indoor environment is also becoming more and more serious. Formaldehyde is very harmful to the human respiratory system. It can irritate the throat and be accompanied by symptoms such as nausea and vomiting. Long-term exposure to formaldehyde may even cause cancer.

[0003] At present, there are two main methods that have been practically applied in the field of indoor air purification: ① using porous materials such as activated carbon for physical adsorption; ② using noble metal materials for catalytic oxidation. For exam...

Examples

Embodiment 1

[0030] A kind of MnO x -The preparation method of MOF-Gr-1 composite material, comprising:

[0031] (1) Preparation of Mn-MOFs material: 1.2g of manganese chloride tetrahydrate and 0.3g of terephthalic acid were fully dissolved in a mixture containing 3mL of water and 15mL of N,N dimethylformamide (DMF), and then the mixture was Heat water at 100-160°C for 1-5 hours, filter, wash and dry the reactant to obtain Mn-MOFs crystal material;

[0032] (2) Mix Mn-MOFs material with graphene dispersion: add 5mg graphene into 10mL deionized water and ultrasonically disperse for 10-30min to obtain graphene dispersion, then add Mn-MOFs to graphene dispersion and stir ultrasonically to disperse the mixture evenly;

[0033] (3) Preparation of oxidant solution: take 5g potassium permanganate and dissolve it in 40mL deionized water to ensure complete dissolution to obtain oxidant solution;

[0034] (4) Fully mix the mixed solution prepared in step (2) with the oxidant solution prepared in ...

Embodiment 2

[0039] A kind of MnO x -The preparation method of the MOF-Gr-2 composite material is basically the same as the method in Example 1, the difference is that in step (2), the amount of graphene is 15mg. The yield of Example 2 was also 50%.

[0040] Such as figure 1 Shown, is the MnO prepared by Example 2 of the present invention x - The FT-IR spectrum of the MOF-Gr-2 composite material, qualitatively determined the surface groups of the catalyst, located at 3400cm in the figure -1 The peak is the infrared characteristic absorption peak of -OH, located at 500cm -1 The peak is the absorption peak of the Mn-O bond, which verifies the generation of manganese dioxide in the product. Located at 1620cm -1 , 1050cm -1 and 900cm -1 The infrared absorption peaks of corresponding to the C=C stretching vibration absorption peak in aromatics, the C-OH stretching vibration absorption peak in alkoxy groups and the C-O stretching vibration in epoxides, these representative oxygen-containi...

Embodiment 3

[0050] A kind of MnO x -The preparation method of the MOF-Gr-3 composite material is basically the same as the method in Example 1, the difference is that in step (2), the amount of graphene is 25 mg.

[0051] Adopt the same testing method as embodiment 1 to the MnO prepared by present embodiment 3 x -1.0mg / m of MOF-Gr-3 composite material 3 The low-concentration formaldehyde catalytic oxidation static test experiment, the specific implementation method is as follows:

[0052] Weigh 0.1g of the MnO prepared in Example 3 x -MOF-Gr-3 composite material, put it in a petri dish and seal the petri dish with plastic wrap and put it into a formaldehyde reactor. The volume of the reactor is 150L. Seal it, place the formaldehyde volatilization device in the reaction chamber, wait for it to volatilize completely, after reaching equilibrium, put the MnO x - The MOF-Gr-3 composite is fully exposed to the air containing formaldehyde in the reactor.

[0053] Measure the MnO prepared by...