Zr-MOFs/graphene oxide porous composite material as well as preparation method and application thereof

Abstract

The invention provides a Zr-MOFs / graphene oxide porous composite material. During Zr-MOFs preparation, two template agents with different functions are added at the same time, wherein the template agent A is graphene oxide and has a coordination effect with Zr-MOFs and a carrier function; the template agent B is a functional group with a coordination competition effect, and can remove organic matters by washing after inducing the Zr-MOFs hydrothermal reaction; and the template agent B is an organic matter containing carboxyl. The specific surface area of the composite material is 1326-1602 m<2> / g, and the pore size distribution is 0.2-1.2 nm. The preparation method of the Zr-MOFs / graphene oxide porous composite material comprises the following steps: 1) performing hydrothermal reaction synthesis of the Zr-MOFs / graphene oxide porous composite material; and (2) activating the Zr-MOFs / graphene oxide porous composite material. When the material is applied as a hydrogen storage material, the hydrogen adsorption capacity is 2.5-3.1 wt% under the condition that the adsorption temperature is 77K. The method has the advantages that the experimental process is simple; the hydrogen storage capacity is improved by 24%; the two template agents with different functions are introduced, and the defect degree and the micropore volume of the composite material are improved through competitive coordination.

Description

technical field [0001] The invention relates to the technical field of porous material modification, in particular to using graphene oxide to support Zr-MOFs and modifying with formic acid to prepare a porous composite material, so that it has good hydrogen storage performance. Background technique [0002] With the development of industry and the improvement of people's material living standards, human demand for energy is increasing. Since the energy used in recent decades mainly comes from fossil fuels (such as coal, oil, natural gas, etc.), its use will inevitably pollute the environment, and its reserves are limited, so it is urgent to find renewable green energy. As a green energy and energy carrier with abundant reserves, wide sources and high energy density, hydrogen energy is attracting widespread attention. Therefore, the development of hydrogen storage materials with high performance is one of the key issues facing the field of hydrogen storage. [0003] Metal-o...

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Problems solved by technology

[0007] In the article (Journal of Industrial and Engineering Chemistry 27 (2015) 102–107), Zhong et al. prepared UIO-66 / GO composites with a specific surface area of ​​1184m 2 / g, the composite of graphene oxide and UIO-66 increases the specific surface area, but due to the less microporous structure of the material, the specific surface area of ​​the material is not even as high as UIO-66 reported by Ren et al., which seriously affects the hydrogen storage of the material performance

[0008] Although the current Zr-MOFs materials have high stability, the surface area still needs to be improved, especially the proportion of micropores that contribute greatly to the hydrogen storage performance is low, which cannot meet the application requirements.

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