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Lanthanum-based two-dimensional metal organic framework Ln-TDA nanosheet and preparation method and application thereof

A metal-organic framework, nanosheet technology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve problems such as cumbersome steps, achieve simple and efficient operation, accelerate coordination, overcome long time effect

Active Publication Date: 2021-12-03
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method finally obtains metal-organic framework nanosheets, the steps are cumbersome

Method used

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  • Lanthanum-based two-dimensional metal organic framework Ln-TDA nanosheet and preparation method and application thereof
  • Lanthanum-based two-dimensional metal organic framework Ln-TDA nanosheet and preparation method and application thereof
  • Lanthanum-based two-dimensional metal organic framework Ln-TDA nanosheet and preparation method and application thereof

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[0030] The invention provides a preparation method of a lanthanum-based two-dimensional metal-organic framework Ln-TDA nanosheet, comprising the following steps:

[0031] dissolving 2,2'-thiodicarboxylic acid and lanthanide metal salt into an aqueous alkali metal hydroxide solution to obtain a reaction solution;

[0032] The reaction solution is subjected to a microwave reaction under ultrasonic conditions to obtain a lanthanum-based two-dimensional metal-organic framework Ln-TDA nanosheet.

[0033] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0034] In the invention, 2,2'-thiodicarboxylic acid and lanthanide metal salt are dissolved in alkali metal hydroxide aqueous solution to obtain a reaction solution.

[0035] In the present invention, the lanthanide metal salt preferably includes a lanthanide metal nitrate; the lanthanide metal nitrate includes lanthanum nitrate or cerium nitrat...

Embodiment 1

[0049] Step 1. Dissolve 0.36 g of 2,2'-thiodicarboxylic acid (TDA) in 60 mL of NaOH aqueous solution with a concentration of 75 mmol / L, and sonicate for 5 min;

[0050] Step 2, 0.51g of La(NO 3 ) 3 ·6H 2 O was added to the above solution and ultrasonicated for 5 minutes to form a transparent mixed solution;

[0051] Step 3. Transfer the above mixed solution to a four-necked round-bottomed flask, put it into a multifunctional microwave synthesis extraction instrument (model: UWave-200C), and heat the round-bottomed flask at a heating rate of 9°C / min under a microwave heating power of 400W. Heat the bottom flask to 90°C and keep it for 10 minutes for microwave reaction; while the microwave heating is turned on, turn on the ultrasonic vibrator, and the vibration frequency is 200kHz;

[0052] Step 4: After cooling the round bottom flask to room temperature, transfer it to a beaker and let it stand, remove the supernatant, collect the white solid by centrifugation (4000rpm), was...

Embodiment 2

[0055] Step 1. Dissolve 0.36 g of 2,2'-thiodicarboxylic acid (TDA) in 60 mL of NaOH aqueous solution with a concentration of 75 mmol / L, and sonicate for 5 min;

[0056] Step 2, 0.52g of Ce(NO 3 ) 3 ·6H 2 O was added to the above solution and ultrasonicated for 5 minutes to form a transparent mixed solution;

[0057] Step 3. Transfer the above mixed solution to a four-necked round-bottomed flask, put it into a multifunctional microwave synthesis extraction instrument (model: UWave-200C), and heat the round-bottomed flask at a heating rate of 9°C / min under a microwave heating power of 400W. Heat the bottom flask to 90°C and keep it for 10 minutes for microwave reaction; while the microwave heating is turned on, turn on the ultrasonic vibrator, and the vibration frequency is 200kHz;

[0058] Step 4: After cooling the round bottom flask to room temperature, transfer it to a beaker and let it stand, remove the supernatant, collect the white solid by centrifugation (4000rpm), was...

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Abstract

The invention provides a lanthanum-based two-dimensional metal organic framework Ln-TDA nanosheet and a preparation method and application thereof, and belongs to the technical field of water treatment materials. The preparation method comprises the following steps: dissolving 2, 2'-thiodicarboxylic acid and lanthanide metal salt into an alkali metal hydroxide aqueous solution to obtain reaction liquid; and carrying out microwave reaction on the reaction liquid under an ultrasonic condition to obtain the lanthanum-based two-dimensional metal organic framework Ln-TDA nanosheet. According to the preparation method, 2, 2'-thiodicarboxylic acid is taken as an organic ligand, lanthanide series metal is taken as a metal source, under the condition that layered-structure MOFs are synthesized through microwave heating, interlayer force can be effectively destroyed through ultrasonic vibration, and single-layer or few-layer two-dimensional nanosheets can be obtained through a one-step method; operation is simple and efficient; and the tedious steps of post-treatment and the like for obtaining the nanosheet by ultrasonically stripping the layered blocky material through an organic solvent are avoided.

Description

technical field [0001] The invention relates to the technical field of water treatment materials, in particular to a lanthanum-based two-dimensional metal-organic framework Ln-TDA nanosheet and a preparation method and application thereof. Background technique [0002] Eutrophication refers to the deterioration of water quality caused by excessive nitrogen and phosphorus content in water bodies. Excessive concentration of phosphorus in water bodies will lead to environmental pollution, reduction of aquatic species, and even seriously threaten and affect human health. The concentration of total phosphorus in natural water bodies is higher than 0.02mgP / L, which will lead to eutrophication of water bodies. Therefore, effective control of phosphorus concentration in water becomes the key to eutrophication control. The adsorption method is simple in operation, low in cost and low in energy consumption, and is the preferred method for removing low-concentration phosphate. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/226B01J20/0207B01J20/22B01J20/28033B01J20/30C02F1/286C02F2101/105Y02W10/37
Inventor 蒋峰芝郑紫光李慧颖皮晓琳马敏蒋小梅
Owner YUNNAN UNIV
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