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Metal organic framework material for selectively and quickly removing Sr2+ in strong alkaline solution and preparation and application thereof

A metal-organic framework, CH2PO3 technology, applied in other chemical processes, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as poor selectivity, slow removal kinetics, and insufficient performance

Active Publication Date: 2021-04-16
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the existing Sr 2+ Removing the technical problems of slow material removal kinetics, poor selectivity, and insufficient performance under extreme conditions, the purpose of the present invention is to provide a selective and rapid removal of Sr in strong alkaline solutions 2+ Metal organic framework material and its preparation and application, the present invention utilizes phosphonic acid ligand and Zr 4+ The strong binding force of the metal center has developed a very stable Zr-based MOFs material, which can quickly and selectively remove radioactive Sr in a strong alkaline environment. 2+

Method used

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  • Metal organic framework material for selectively and quickly removing Sr2+ in strong alkaline solution and preparation and application thereof
  • Metal organic framework material for selectively and quickly removing Sr2+ in strong alkaline solution and preparation and application thereof
  • Metal organic framework material for selectively and quickly removing Sr2+ in strong alkaline solution and preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: the synthesis of SZ-7

[0036] ZrOCl 2 ·8H 2 O (48.3mg, 0.15mmol), tetraethyl p-xylene diphosphate (C 16 h 28 o 6 P 2 ) (94.5mg, 0.25mmol), commercially available concentrated nitric acid (100μL), commercially available concentrated hydrofluoric acid (50μL) and a mixed solvent of 2.5ml water and DMA (V DMA :V 水 =4:1) sealed in a 10mL tetrafluoroethylene reactor, then heated in an oven at 210°C for 3 days, then dropped to room temperature at a cooling rate of 23°C / h, after the reaction was completed, the precipitate was washed with water and ethanol, After drying, a colorless single-phase SZ-7 single crystal was obtained.

[0037] Schematic diagram of the synthesis and structure of SZ-7 figure 2 As shown, the whole material is composed of negative zirconium phosphonate layers and interlayer cations to form a three-dimensional structure.

[0038] SZ-7 is a single crystal material, and its various parameters are shown in Table 1:

[0039] Table 1. ...

Embodiment 2

[0042] Embodiment 2: the stability test of SZ-7

[0043] Before studying the actual removal ability of the material, the water stability of the material was studied first. SZ-7 was treated with an aqueous solution with a pH of 0-14. Specifically, the pH of the aqueous solution was adjusted to 0-14 by nitric acid and sodium hydroxide solution. Add 10 mg of SZ-7 to 10 mL of the above aqueous solution and shake for 1 day, then collect the solid and dry it for PXRD (powder X-ray diffraction) test, as shown in figure 2 As shown, the curves from top to bottom in the figure are 1M concentrated nitric acid (pH=0), pH13, pH14, and crystal PXRD curves under fitting conditions. The results show that SZ-7 can exist stably at pH 0-14, In the extreme case Sr 2+ The removal laid the foundation.

Embodiment 3

[0044] Embodiment 3: SZ-7 removes Sr 2+ test results

[0045] At room temperature, put SZ-7 into Sr-containing 2+ In aqueous solution, in solution, Sr 2+ The concentration is 10ppm, and the dosage of SZ-7 is 1g / L. Test SZ-7 on Sr at different time points 2+ The removal rate, the result is as follows image 3 a) as shown. SZ-7 vs. Sr 2+ The removal kinetics results ( image 3 a)) shows that SZ-7 can remove 94% of Sr in aqueous solution within 2 minutes 2+ , which in Sr 2+ The removal of materials is the fastest, surpassing most materials, including commercial and traditional Sr 2+ Remove material. The inner mechanism of ultrafast kinetics is related to the channel matching principle, the interlayer distance and Sr of SZ-7 2+ hydrated ionic radius Highly matched so that SZ-7 can remove most of Sr in water in extreme time 2+ . The fast kinetics can also reduce the contact time between SZ-7 and the extreme water environment, and reduce the damage to materials caused...

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Abstract

The invention relates to a metal organic framework material for selectively and rapidly removing Sr2+ in a strong alkaline solution and preparation and application thereof. The structural formula of the metal organic framework material is [(CH3)2NH2]2[ZrC6H4(CH2PO3)2F2], the metal organic framework material is named as SZ7, p-xylene diphosphate and zirconium ions form a layered structure, oxygen atoms, zirconium ions and fluorine ions in p-xylene diphosphate form a ZrO4F2 octahedron, and dimethylamine cations [(CH3) 2NH2]+ are filled in the layered structure. The invention also discloses an application of the SZ-7 as an Sr2+ adsorbent. The Zr-based MOFs material with a very stable structure is developed by utilizing the strong binding force of the phosphonic acid ligand and the Zr4+ metal center, and radioactive Sr2+ can be rapidly and selectively removed in a strong alkaline environment.

Description

technical field [0001] The present invention relates to Sr 2+ Adsorbent, especially related to a kind of selective fast removal of Sr in strong alkaline solution 2+ Metal-organic framework materials and their preparation and applications. Background technique [0002] The rapid development of nuclear energy has led to the rapid accumulation of nuclear waste, of which 235 U and 239 Split Nuclides Produced by Pu Fission 90 Sr is a strong β radiation source and the main exothermic nuclide in spent fuel. 90 The high proportion, high radiation and high fever of Sr bring huge hidden dangers to nuclear safety. Once leaked and absorbed by organisms, it will also cause highly lethal radioactive diseases such as bone cancer, and bring serious harm to biological health and the environment. Since the 1990s, the United States began to look for suitable 90 Solid-phase adsorbent for high radioactive nuclides such as Sr. Since then, effective materials such as titanates, zeolites, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28
CPCY02P20/151
Inventor 王殳凹张葭榕陈龙
Owner SUZHOU UNIV
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