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Method for preparing metal-organic frameworks by one-step degradation of polyacid-induced waste polyester plastics

A metal organic framework, polyester plastic technology, applied in plastic recycling, recycling technology and other directions, can solve environmental pollution, equipment corrosion and other problems, achieve the effect of simple process, convenient operation, suitable for large-scale production

Active Publication Date: 2019-09-27
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet the problem that these methods still exist is to need to use a large amount of acid or alkali, high temperature (200-250 ℃) or high pressure (1.4-2MPa) and longer reaction time for complete hydrolysis
In the same year, Dirk E. De Vos research group reported the addition of HCl (37%), HNO 3 Or under the condition of NaOH, Al-MOF was constructed and the possibility of growing MOFs nanocrystals directly on the PET bottle wall was explored, but there were still some problems, such as: the use of acid and alkali substances, which seriously corroded the equipment and brought Severe Environmental Pollution Problems

Method used

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  • Method for preparing metal-organic frameworks by one-step degradation of polyacid-induced waste polyester plastics
  • Method for preparing metal-organic frameworks by one-step degradation of polyacid-induced waste polyester plastics
  • Method for preparing metal-organic frameworks by one-step degradation of polyacid-induced waste polyester plastics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, configure a 0.5M sodium acetate buffer solution, take 5ml in a 15ml reaction kettle, and then add the precursor material of polyacid (Na 9 [PW 9 o 34 ], 0.15g NiCl 2 ·6H 2 (2, 0.4g), then add a certain amount of waste polyester plastic fragments (polyethylene terephthalate plastic PET), stir evenly, heat up to 180°C in a 15ml reactor and keep it for 72h. After it was cooled to room temperature, the unreacted waste polyester plastics were manually selected and separated, filtered and washed several times, and then dried to obtain a solid product polyacid-based metal-organic framework (Ni-POMOF). A compound with a two-dimensional lamellar structure.

[0024] The structure of the obtained POMOFs material was analyzed by powder X-Ray diffraction (PXRD) and infrared, and its characterization can be found in figure 1 a and 2, the PXRD figure of its stability sees image 3 , proving that it is a kind of polyacid-based metal-organic frameworks (POMOFs) with excelle...

Embodiment 2

[0026] In embodiment 1, the precursor material is replaced by Zn 4 PMo 12 The precursor material is then reacted under the same conditions, and the product is processed to obtain the solid product Z-POMOF, a compound with a three-dimensional network structure.

[0027] The structure of the obtained POMOFs material was analyzed by powder X-Ray diffraction (PXRD), and the characterization diagram is shown in figure 1 b.

Embodiment 3

[0029] Change the precursor substance into V in Example 1 6 The precursor material of S is then reacted under the same conditions, and the product is processed to obtain a solid product VMOP-11, a compound with a zero-dimensional polyhedral structure.

[0030] The structure of the obtained POMOFs material was analyzed by powder X-Ray diffraction (PXRD), and the characterization diagram is shown in figure 1 c.

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Abstract

The invention discloses a method for preparing metal-organic frameworks by one-step degradation of polyacid-induced waste polyester plastics. The method comprises the following steps that a polyacid precursor substance is added into a sodium acetate buffer solution, mixing and stirring are carried out until the solution is clarified, then waste polyester plastic fragments are added, uniform stirring is carried out, the temperature is raised to 170-190 DEG C and maintained for 60-80 hours, then cooling, filtering, washing and drying are carried out, and the polyacid-based metal-organic frameworks are obtained. Compared with a traditional preparation method, the polyacid-based metal-organic frameworks (POMOFs) with excellent stability are synthesized while the plastics are hydrolyzed through one pot method. In the whole process, the hydrolysis rate of the polyester plastics reaches 100% or nearly 100%. The method for preparing the metal-organic frameworks by one-step degradation of the polyacid-induced waste polyester plastics has the advantages that the efficient degradation of the polyester plastics and the synthesis of the POMOFs can be achieved simultaneously by adopting a simple one-pot reaction method, the process is simple, the operation is convenient, and the method is green and environmentally friendly, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing metal-organic framework materials by one-step degradation of waste polyester plastics induced by polyacids, and belongs to the technical field of metal-organic framework materials preparation. Background technique [0002] With the development of industry and the rapid increase of the world population, human life and industrial production activities have brought a lot of waste plastics, and plastic pollution has become a serious problem all over the world. From the invention of plastic in 1950 to the present, the plastic industry has achieved prosperous development in the past few decades. In 2018, the world's plastic consumption reached 8 billion tons, of which 70% were discarded after use. Because most plastics have good tolerance to the natural environment, many plastics can even exist in the natural environment for hundreds of years without being degraded, which has brought serious environmental poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/16C08G83/00C08L67/02
CPCC08J11/16C08G83/008C08J2367/02Y02W30/62
Inventor 兰亚乾陈勇军陈宜法王艺蓉姚苏娟
Owner NANJING NORMAL UNIVERSITY