Two-dimensional layered water-stable dye adsorbent and preparation method thereof

A two-dimensional layered, water-stabilized technology, applied in water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as poor water stability and limited use, and achieve enhanced stability and increased adsorption capacity , the effect of novel structure

Active Publication Date: 2020-05-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor water stability of some MOFs, such as IR-MOF-3 series compounds, which objectively limit their use in water environments, it is of great significance to prepare MOFs with good water stability.

Method used

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  • Two-dimensional layered water-stable dye adsorbent and preparation method thereof
  • Two-dimensional layered water-stable dye adsorbent and preparation method thereof
  • Two-dimensional layered water-stable dye adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh H 2 QDAB (0.05mmol), dissolved in 1mL N, N-dimethylformamide (DMF), until it was completely dissolved, added 1mL deionized water containing sodium hydroxide (0.05mmol), shake well, and finally add Zn(NO 3 ) 2 ·6H 2O (0.06mmol), put it into a 25mL stainless steel kettle with a polytetrafluoroethylene liner, keep it at 90°C for 72h, cool down for one day, colorless granular crystals precipitate, take it out and use DMF:H 2 O (1:1) was washed three times, dried naturally, and collected. Finally, pure colorless transparent tetragonal block crystals are obtained, which is the target product.

Embodiment 2

[0025] Embodiment 2: compared with embodiment 1, what add is hydrochloric acid.

[0026] Weigh H 2 QDAB (0.05mmol), dissolved in 1mL N,N-dimethylformamide, after it is completely dissolved, add 1mL deionized water containing hydrochloric acid (0.05mmol), shake well, and finally add Zn(NO 3 ) 2 ·6H 2 O (0.06mmol), put it into a 25mL stainless steel kettle with a polytetrafluoroethylene liner, keep it at 90°C for 72h, cool down for one day, the product precipitates, take it out and use DMF:H 2 O (1:1) was washed three times, dried naturally, and collected. The final product was an unknown substance, and the target product could not be obtained.

Embodiment 3

[0027] Embodiment 3: compared with embodiment 1, only add deionized water, do not add sodium hydroxide.

[0028] Weigh H 2 QDAB (0.05mmol), dissolved in 1mL N, N-dimethylformamide, after it is completely dissolved, add 1mL deionized water, shake well, and finally add Zn(NO 3 ) 2 ·6H 2 O (0.06mmol), put into the stainless steel kettle of the polytetrafluoroethylene liner of 25mL, keep 90 ℃ 72h, cool down one day, the material of powder form is separated out, powder diffraction shows, although some material is [Zn(QDAB)( h 2 O)]·2H 2 O, but the purity is poor.

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Abstract

The invention provides a two-dimensional layered water-stable dye adsorbent and a preparation method thereof. According to the method, an organic ligand 2, 3-bis (4-amino-3-methylbenzoic acid)-1, 4-quinoxaline (H2QDAB) is used as a raw material. The chemical formula of the obtained compound is [Zn(QDAB)(H2O)].2H2O. Under the solvothermal mild condition, an organic ligand H2QDAB and Zn(NO3)2.6 H2Oare accurately weighed in a mixed solution of DMF and water, and under the condition that NaOH is added, an organic-metal framework crystal is obtained through a thermal reaction. The metal-organic framework material has good water stability, has a good adsorption effect on methyl blue and crystal violet among organic dye molecules, has weak adsorption capacity on rhodamine B and methyl orange, shows a certain selective adsorption effect and can be used for removing organic dye molecules. In addition, due to the unique structural characteristics, the adsorbent is expected to be applied to gasadsorption and separation.

Description

technical field [0001] The invention belongs to the technical field of dye adsorbent preparation, and specifically relates to a two-dimensional layered 2,3-bis(4-amino-3-methylbenzoic acid)-1,4-quinoxaline as a ligand Dye adsorbent and preparation method. Background technique [0002] With the widespread use of various dyes, a large number of dyes are released into the environment during production and use. Most of these dyes are extremely stable and difficult to degrade naturally after entering environmental waters, resulting in increased chroma in polluted waters and affecting the amount of incident light. In turn, it affects the normal life activities of aquatic animals and plants, and destroys the ecological balance of the water body. What's more serious is that most of the dyes are toxic substances, which have carcinogenic and teratogenic effects, and their discharge into the environment will pose a great threat to the health of humans and other organisms. How to effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/30
CPCB01J20/226C02F1/285C02F2101/308
Inventor 卞佳鹏夏昌坤苏江朱光辉
Owner JIANGSU UNIV
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