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Metal organic framework-based ternary composite material and preparation method thereof

A metal-organic framework and composite material technology, which is applied in the field of metal-organic framework-based ternary composite materials and their preparation, can solve the problem of insufficient catalytic performance, low visible light utilization rate and hydrogen production rate, and reduction of photocatalytic reaction active sites. and other problems, to achieve the effect of increasing the light absorption range, good photocatalytic cycle stability, and promoting the interfacial charge transfer efficiency.

Pending Publication Date: 2021-09-28
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

However, in the existing methods, on the one hand, the uniform growth of CdS on the outer surface of MOFs should be controlled during the preparation process, otherwise, if the amount of generated CdS is too much, it may agglomerate on the surface of MOFs, reducing the photocatalytic reaction active sites, and achieving less than optimal catalytic performance; on the other hand, UiO-66 / CdS composites still have low utilization rate of visible light and hydrogen production rate under visible light

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  • Metal organic framework-based ternary composite material and preparation method thereof
  • Metal organic framework-based ternary composite material and preparation method thereof
  • Metal organic framework-based ternary composite material and preparation method thereof

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preparation example Construction

[0028] The preparation method of the metal-organic framework-based ternary composite material of the present invention specifically comprises the following steps:

[0029] Step S1, dissolving a certain amount of chloroplatinic acid hexahydrate and polyvinylpyrrolidone in water and methanol respectively, then mixing the two solutions, heating to boiling reflux, and then removing the solvent to obtain Pt nanoparticles;

[0030] Step S2, a certain amount of ZrCl 4 Dissolve 2-aminoterephthalic acid in DMF, then add a certain amount of acetic acid and the DMF solution of Pt nanoparticles, disperse evenly, transfer to a hydrothermal kettle, react for a period of time at 80 ° C ~ 120 ° C, and finally wash and dry getPt@MOF;

[0031] Step S3, dissolving Pt@MOF in ethanol, then adding cadmium acetate, heating up to 80°C-100°C after dissolving, then slowly adding an aqueous solution of thioacetamide, keeping it at 80°C-100°C for a period of time, then washing and drying , and finally ...

Embodiment 1

[0039] In this example, the preparation of metal-organic framework-based ternary composites is described in detail.

[0040] Step S1, preparation of PtNPs:

[0041] Dissolve 5~10mL of chloroplatinic acid (25mM) and 44.3~133.9mg of PVP in 90~95mL of deionized water and 60mL of methanol respectively, then mix them, heat up to boiling and reflux for 2~5h, and then remove the solvent by rotary evaporation. The modified PtNPs were washed by centrifugation and finally dispersed in DMF for later use.

[0042] Step S2, preparation of Pt@MOF:

[0043] Dissolve 46.6mg of ZrCl4 and 36.2mg of 2-aminoterephthalic acid in DMF, then add 2.0-5.0mL of glacial acetic acid and 0-280μL of PtNPs in DMF, ultrasonically disperse evenly and transfer to a hydrothermal kettle, 80-140 ℃ for 24 hours, and finally centrifuged, washed and dried to obtain Pt@MOF.

[0044] Step S3, preparation of Pt@NH2-UiO-66 / CdS:

[0045] Dissolve 20-60 mg of Pt@MOF in 10 mL of ethanol, add 24.3 mg of cadmium acetate d...

Embodiment 2

[0049] The difference between this embodiment and embodiment 1 is that the amount of PVP added in step S1 becomes 88.6 mg, and the rest are the same as in embodiment 1.

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Abstract

The invention belongs to the technical field of metal organic framework composite materials, and provides a metal organic framework-based ternary composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, PtNPs is encapsulated on the inner surface of MOFs through a solvothermal method; and a temperature is adjusted through a double-solvent method, so CdS can grow on the outer surface of the MOFs. The prepared material has a regular octahedral structure, a large specific surface area and good stability and dispersity. According to the method for loading the semiconductor CdS on a MOFs-based multi-component composite catalyst, the prepared composite material promotes the charge transfer efficiency of a heterojunction interface, and a visible light-catalyzed hydrogen production rate is increased; and the composite material can obviously increase the hydrogen production rate of CdS, Pt@MOF and MOF / CdS and the utilization rate of visible light, has good photocatalytic cycle stability and overcomes the problems that MOFs are poor in response to visible light, CdS electrons and holes are rapidly compounded and the like. Meanwhile, the preparation method is simple and controllable in process, cheap in raw materials, and simple in process flow.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework composite materials, and in particular relates to a metal-organic framework-based ternary composite material and a preparation method thereof. Background technique [0002] Human beings are facing two major global problems: energy shortage crisis and serious environmental pollution. The overexploitation and consumption of fossil fuels is one of the main reasons for the above problems. Developing a technology that can solve these two problems at the same time is a direction worthy of research. Hydrogen (H 2 ), as a green and low-carbon energy carrier, will play a key role in the clean, environmentally friendly and safe future energy concept. Compared with hydrogen production from fossil energy, using solar energy to directly split water to produce hydrogen is a more ideal and promising way of hydrogen production. Since Fujishima and Honda have successfully produced H through pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J27/04B01J23/42B01J35/10C01B3/04
CPCB01J31/1691B01J27/04B01J23/42C01B3/042B01J2531/48B01J2531/0213B01J2231/62B01J35/23B01J35/39B01J35/617Y02E60/36
Inventor 廉孜超李召訾江芝吴钒钟玥琪杨伟伟
Owner UNIV OF SHANGHAI FOR SCI & TECH