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A kind of magnetic polymer nano adsorption material lm-mp and its preparation method and application

A nano-adsorption material, LM-MP technology, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of difficult recovery, small adsorption capacity, difficult regeneration, etc., and achieve easy modification and easy Modification, not easy to secondary pollution effect

Active Publication Date: 2021-12-31
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commonly used adsorption materials include activated carbon and zeolite, etc. However, these materials have defects such as small adsorption capacity, difficult recovery, and difficult regeneration. Therefore, an adsorption separation material with large adsorption capacity, easy recovery, and recycling is constructed and synthesized to remove water The organic dyes are of great significance

Method used

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  • A kind of magnetic polymer nano adsorption material lm-mp and its preparation method and application
  • A kind of magnetic polymer nano adsorption material lm-mp and its preparation method and application
  • A kind of magnetic polymer nano adsorption material lm-mp and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: a kind of preparation method of magnetic polymer nano adsorption material LM-MP comprises the following steps:

[0031] 1) Preparation of polymer material LM-P:

[0032] First, add 2.45g LM and 2.5mL triethylamine to 10mL DMSO in turn, stir rapidly until the solution is clear, add 5.64g PDA, and react at room temperature for 24h to obtain a block-like gel-state product. After the gel-state product is ground Acetone precipitation was carried out, and the precipitate obtained by suction filtration was washed and filtered with 300mL ultrapure water and freeze-dried to obtain 5.6g of white powder, the polymer material LM-P;

[0033] 2) Preparation of magnetic nanoparticles MNP@LM-P:

[0034] 1.0g FeCl 3 ·6H 2 O, 0.45g FeCl 2 4H 2 0 and 0.9g of LM-P obtained in step 1) were placed in a three-necked flask, 200mL of ultrapure water was added, stirred and heated to 80°C under nitrogen protection, and concentrated ammonia water was added dropwise after 5min to...

Embodiment 2

[0042] Example 2: Adsorption of cationic dyes by LM-MP

[0043] 1) Effect of pH on adsorption performance

[0044] Measure the absorbance of LM-MP before and after dye adsorption under pure water and different pH (2-10) conditions, and explore the effect of pH on the adsorption performance of LM-MP, such as Image 6 .

[0045] from Image 6 It can be seen that under the conditions of strong acid and strong alkali, the adsorption performance of LM-MP is relatively weakened. Under the conditions of , 7, 8, 9 and secondary water, the adsorption performance is better, so it can be concluded that the adsorbent has a wide range of applications, and the follow-up experiments are all carried out under the condition of secondary water.

[0046] 2) Effect of ionic strength on adsorption performance

[0047] Measure the absorbance of LM-MP before and after dye adsorption in NaCl solution at different concentrations (0, 0.01, 0.1, 0.5, 1, 1.5, 2mol / L), and explore the effect of ionic ...

Embodiment 3

[0063] Embodiment 3: Desorption and reuse experiment

[0064] The complex uses absolute ethanol as the eluent, ultrasonically oscillates for 10 minutes, then magnetically separates, then washes three times with secondary water and absolute ethanol, and vacuum-dries at 40°C to obtain desorbed magnetic polymer nano-adsorption materials. Recycle. This cycle was repeated 6 times, and the adsorption amount of the dye by LM-MP in each cycle was calculated, as Figure 13 .

[0065] It can be seen from Figure 13 that after LM-MP is reused 6 times, the adsorption efficiency is still maintained, and some dyes have increased, indicating that LM-MP is a reusable dye adsorption material. It shows that the complex has a good application prospect in environmental water purification.

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Abstract

The invention provides a magnetic polymer nanometer adsorption material LM‑MP and its preparation method and application. The adsorption material can efficiently adsorb cationic dye pollutants, and the synthesis method of the adsorption material is simple and low in cost. LM-MP was characterized by scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, thermogravimetry, Zeta potential and other methods, and it was confirmed that Fe was grafted into the linear maltodextrin-pyromellitic dianhydride crosslinked polymer. 3 o 4 Magnetic nanoparticles, and have good magnetic properties. The adsorption material has large specific surface area, abundant hydroxyl and carboxyl groups and excellent superparamagnetic properties, and can be used as an adsorption material for cationic dye pollutants in aqueous solution. Using methyl green, malachite green, methyl violet, and ethyl violet dyes as model molecules to study the adsorption performance, it shows that the material can efficiently adsorb cationic organic dyes, and can be recycled without reducing the adsorption efficiency. It has application prospects in the aspect of environmental pollutant adsorption materials.

Description

technical field [0001] The invention belongs to magnetic nanometer adsorption material and water treatment technology, in particular to a magnetic polymer nanometer adsorption material and its preparation method and application. Background technique [0002] Cationic organic dyes are widely used in textile, paper, printing, food and pharmaceutical industries, and most cationic organic dyes are easily soluble in water, so removing cationic organic dyes before industrial wastewater discharge has become a topic of great concern. So far, the methods for removing cationic organic dyes in wastewater mainly include photodegradation, biodegradation and adsorption. Among them, the cost of adsorption is low, the removal efficiency is high, and some adsorption materials can be reused, so adsorption separation is the most effective way to remove organic dyes. a method of Commonly used adsorption materials include activated carbon and zeolite, etc. However, these materials have defects ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/267B01J20/06B01J20/28009C02F1/285C02F1/281B01J2220/4812B01J2220/4806B01J2220/4825C02F2101/308
Inventor 梁文婷张成玲黄昱马学文董川双少敏
Owner SHANXI UNIV
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