Method for modifying MOFs material through low-temperature plasma and application of MOFs material

Abstract

The invention discloses a method for modifying a MOFs (Metal-Organic Frameworks) material by low-temperature plasma and application of the MOFs material. The method comprises the following steps that: under the condition of air tightness, argon passes through a liquid modifier, so that the argon carries saturated steam of the liquid modifier to carry out low-temperature plasma discharge reaction with MOFs, the liquid modifier is an organic reagent which is in a liquid state at room temperature or an organic reagent which is in a liquid state under an oil bath heating condition at the temperature of not higher than 100 DEG C, the low-temperature plasma discharge reaction is carried out under the conditions of room temperature and normal pressure, the discharge power is 0.5-1.5 W, and after the plasma reaction is finished, functionalized modified MOFs are obtained. The method disclosed by the invention is simple in equipment, mild in condition, low-carbon and environment-friendly, and the obtained functionalized modified MOFs material can be used as a solid-phase extraction adsorbent and be efficiently, cyclically and stably applied to selective adsorption and enrichment of pesticide molecules in a complex matrix.

Description

technical field [0001] The invention relates to the technical field of preparation of metal organic framework materials, in particular to a method and application of low-temperature plasma modification of MOFs materials. Background technique [0002] Metal Organic Frameworks (MOFs for short) are one of the star materials that have shined in the field of advanced materials in the past 20 years. Compared with traditional porous solid-phase materials, MOFs have unique and significant advantages, including high and even Ultra-high specific surface area and porosity, regular pore structure and modifiability of pore environment, as well as designability of structure and controllability of properties. In the field of analytical chemistry, MOFs are a new type of solid-phase extraction adsorption material with great potential. Its regular pore structure can exert size effect and shape selectivity. The role is to reversibly adsorb the guest molecules to achieve the purpose of reversi...

AI Technical Summary

Problems solved by technology

The strategy of in situ synthesis of functionalized MOFs is limited by the solubility of organic ligands, thermal stability, chemical stability, and the compatibility of functional groups, which limits the scope of functional modification.

The post-synthesis functional modification strategy is currently mainly based on the covalent modification of the organic linker in MOFs. There are strict requirements for the free functional groups on the organic linker and the electrical properties and spatial structure of the organic linker. The range of functional modification is also very large. narrow

From a macro point of view, the current functional modification strategies for MOFs are all based on traditional chemical reactions, which are limited by the dual constraints of reaction thermodynamics and kinetics, and the control space for functional modification is limited; on the other hand, the common problems existing in the current modification strategies are , the reaction is all carried out in a solution system, the amount of organic solvent is large, the reaction conditions are generally harsh, the requirements for equipment are high, the functionalization reagent is expensive, the cost of functionalization modification is high, and it is difficult to achieve real practical application

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