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Organic functional material and preparation method and application in iodine adsorption thereof

A technology of organic functional materials and iodine molecules, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem that the ability to capture iodine needs to be further improved, and achieve the effect of simple and fast synthesis method, easy operation and large adsorption capacity.

Inactive Publication Date: 2019-04-12
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesized supramolecular hydrogel can trap iodine molecules in gas and iodine molecules in hexane solution, but the ability to trap iodine needs to be further improved

Method used

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  • Organic functional material and preparation method and application in iodine adsorption thereof
  • Organic functional material and preparation method and application in iodine adsorption thereof
  • Organic functional material and preparation method and application in iodine adsorption thereof

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Put 1 mmol of citric acid and 1 mmol of cytosine in an agate mortar and grind them evenly. Citrazinic acid was hydrothermally synthesized by the inventor's laboratory (according to CN201810129627.5 method);

[0027] (2) Weigh 0.1 g of the above mixture into a 5 ml glass bottle, add 1 ml of water with a volume fraction of 5% acetonitrile-water mixed solution for 10 s, and let it dry naturally for one day to obtain the adsorbent CACY.

[0028] The prepared CACY was observed under a scanning electron microscope (SEM), and it was found that the material had a nanobrick-like structure, such as figure 1 shown. The nitrogen adsorption isotherm curve shows that the material has a surface area of ​​10m 2 / g, the pore size is 50-200nm, such as figure 2 shown. The infrared reflectance comparison spectra of CACY and two monomers (citrazinic acid and cytosine) show that the asymmetry of the N-H bond in cytosine (3360cm -1 ) and symmetrical stretching vibration (3160cm -1...

Embodiment 2

[0031] (1) Put 1 mmol of citric acid and 2 mmol of cytosine in an agate mortar and grind them evenly;

[0032] (2) Weigh 0.1 g of the above mixture into a 5 ml glass bottle, add 1 ml of water with a volume fraction of 5% acetonitrile-water mixed solution for 10 s, and let it dry naturally for one day to obtain the adsorbent.

[0033] Weigh 20 mg of the adsorbent and 100 mg of solid iodine elemental substance in a closed petri dish, reach the saturated adsorption capacity in 48 h, and the adsorption capacity is 1.2 g g -1 . After the material is recycled 3 times, the adsorption capacity is 96% of the original, such as Figure 6 shown.

Embodiment 3

[0035] (1) Put 1 mmol of citric acid and 1 mmol of cytosine in an agate mortar and grind them evenly;

[0036] (2) Weigh 0.1 g of the above mixture into a 5 ml glass bottle, add 1 ml of water with a volume fraction of 5% acetonitrile-water mixed solution for a few seconds, and let it dry naturally for one day to obtain the adsorbent.

[0037] Weigh 30 mg of the adsorbent in 3 ml 6×10 -2 mol L -1 In the hexane solution of iodine, the adsorption reached saturation after standing still for 8 h. At this time, the saturated adsorption capacity of iodine is 0.4 g g -1 , the removal rate of iodine reaches 67%, such as Figure 7 shown.

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Abstract

The invention belongs to the field of synthesis and application of organic functional materials, in particular to a synthesis method and application of an organic functional material formed through aself-assembly function based on citrazinic acid and cytosine. The method adopts the citrazinic acid and the cytosine as raw materials, and specifically comprises the steps that a certain proportion ofcitrazinic acid and cytosine solid are grinded; the grinded mixture is mixed with a certain proportion of an acetonitrile and water mixed solution to be subjected to ultrasound for several seconds and then naturally dried, and the organic functional material is obtained. The method has the advantages that the material synthesis method is simple and easy to operate, pi electrons enriched in the framework of the synthesized material and the larger pore diameter of the material enable the material to adsorb iodine molecules in air and an organic solvent, and a method for adsorbing radioactive iodine in nuclear waste pollution is provided.

Description

technical field [0001] The invention belongs to the technical field of organic functional materials, and in particular relates to an organic functional material, a preparation method thereof and an application in iodine adsorption. Background technique [0002] Iodine is widely used in biological sciences, environmental chemistry, functional materials and other fields. 129 I is a radioactive element with a long half-life (about 10 7 years) and higher volatility. in nuclear waste 129 The discharge of I will bring serious environmental pollution and have a huge impact on the metabolic process of the human body. Therefore, the effective capture and storage of radioactive iodine is of great significance to human health and sustainable development. At present, the commonly used molecular iodine adsorbents include zeolites, activated carbon and metal-organic frameworks (MOFs). [1] . Zeolites and activated carbons have low adsorption capacity, while the synthesis of MOFs mate...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30
CPCB01J20/22B01J20/30B01J20/3021
Inventor 翁雪香王嘉君向雪晴王秋秋阮永明
Owner ZHEJIANG NORMAL UNIVERSITY
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