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Ferroferric oxide (at) covalent organic framework adsorbing material and application thereof in removal of organic dyes in wastewater

A technology for adsorbing materials and organic dyes, applied in the field of environmental sewage treatment, can solve the problems of difficult to guarantee treatment efficiency, complex printing and dyeing wastewater components, and high treatment costs, and achieve the effects of easy reusability, short adsorption and desorption time, and easy recovery.

Inactive Publication Date: 2020-10-02
MINJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of printing and dyeing wastewater is complex, and the decolorization rate of mixed wastewater containing various dyes is low. Improving the efficiency and recovery of adsorption materials is a problem that should be paid attention to.
The advantages of biological treatment are economic and environmental protection, non-toxic products and low water consumption, but its efficiency is affected by many factors, and it is difficult to guarantee the treatment efficiency.
The oxidant used in the chemical oxidation method has strong selectivity, but requires a large amount of oxidant, and the treatment cost is high

Method used

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  • Ferroferric oxide (at) covalent organic framework adsorbing material and application thereof in removal of organic dyes in wastewater
  • Ferroferric oxide (at) covalent organic framework adsorbing material and application thereof in removal of organic dyes in wastewater
  • Ferroferric oxide (at) covalent organic framework adsorbing material and application thereof in removal of organic dyes in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] According to Fe 3 o 4 Synthetic routes for new @COFs materials (such as figure 1 ), the formation mechanism of COFs synthesized by combining TAMB and TPA as bridging monomers (such as figure 2 ), for Fe 3 o 4 The specific steps for the preparation of @COFs adsorption materials are as follows:

[0044] 1) Fully dissolve 3.4 g of ferric chloride, 1.0 g of sodium citrate and 6.0 g of sodium acetate in 100 mL of ethylene glycol, and transfer the resulting homogeneous yellow solution to a 100 mL reactor. After reacting at 200 °C for 12 h, the magnetic field The product was separated and collected, washed with ethanol and water several times in sequence, and then dried at 25 °C to obtain Fe 3 o 4 NPs, stored in a desiccator at room temperature, ready to use;

[0045] 2) Take 0.15g Fe 3 o 4 NPs were dispersed in 50 mL of DMSO containing 0.106 g TAMB and 0.075 TPA, and sonicated for 5 min, and then 2 mL of acetic acid was added dropwise under vigorous stirring (the ...

Embodiment 2

[0047] 1) Weigh 2.0 mg of Fe prepared in Example 1 3 o 4 Add @COFs adsorption materials to 1mL of different dye solutions with a concentration of 0.1mg / mL, and disperse evenly;

[0048] 2) Shake at room temperature for 1 h, fully adsorb, separate with a magnetic field, collect the supernatant, use a UV-visible spectrophotometer to quantitatively analyze the content of the dye before and after adsorption, and calculate the adsorption amount Q to investigate Fe 3 o 4 The adsorption results of @COFs on Alizarin Red, Methyl Orange, Congo Red, Methylene Blue, Bromophenol Blue, Orange IV, Rhodamine and Coomassie Brilliant Blue are shown in Table 1.

[0049] Table 1 Fe 3 o 4 Adsorption effect of @COFs new material on different dyes

[0050]

[0051] The results in Table 1 show that Fe 3 o 4 @COFs has good adsorption for different dyes, and the adsorption amount for Congo red is the highest, followed by alizarin red.

Embodiment 3

[0053] 1) Weigh 2.0 mg of Fe prepared in Example 1 respectively 3 o 4 NPs and Fe 3 o 4 @COFs adsorption material, added to 1mL Congo red dye solution with a concentration of 0.1mg / mL, dispersed evenly;

[0054] 2) Shake at room temperature for 1 h, fully adsorb, separate with a magnetic field, collect the supernatant, use a UV-visible spectrophotometer to quantitatively analyze the content of the dye before and after adsorption, and calculate the adsorption amount Q to investigate Fe 3 o 4 NPs and Fe 3 o 4 Adsorption of Congo red by @COFs.

[0055] The results showed that Fe 3 o 4 NPs and Fe 3 o 4 The adsorption quantities Q of Congo red by @COFs were 9.52 and 48.07 mg / g, respectively. It can be seen that Fe 3 o 4 There are only weak non-specific interactions such as hydrogen bonds and van der Waals forces between NPs nanoparticles and dye molecules, while Fe 3 o 4 The introduction of COFs layer on the surface of NPs significantly increased the adsorption c...

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Abstract

The invention discloses a Fe3O4 (at) COFs adsorbing material and application thereof in removing organic dyes in wastewater, and belongs to the technical field of environmental sewage treatment. By using Fe3O4 NPs as a carrier, terephthalaldehyde (TPA) and tetra (4-aminophenyl) methane (TAMB) as bridging monomers and acetic acid as a catalyst, a novel Fe3O4 (at) COFs adsorbing material is prepared. The prepared Fe3O4 (at) COFs adsorbing material has the advantages of large surface area and strong adsorbability; the adsorbent has the advantages of large surface area, strong adsorbability, easiness in solid-liquid separation, reusability and the like, has an excellent adsorption effect on organic dyes in wastewater, and has little influence on the adsorption effect due to changes of environmental factors such as pH value and ion strength, so that sample pretreatment is not needed, and the adsorbent has huge potential in environmental treatment of dye wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental sewage treatment, in particular to a novel Fe 3 o 4 @COFs Adsorbent Materials and Their Applications in Adsorption and Removal of Organic Dyes in Wastewater. Background technique [0002] Dyes refer to compounds that enable fibers or other substances to be firmly colored in a molecular state or in a dispersed state in a certain medium. According to their chemical structure (mainly the structure of the conjugated system contained in them), they can be roughly divided into azo dyes, nitrates Based dyes, anthraquinone dyes, fused ring dyes, indigo dyes, phthalocyanine dyes, aromatic methane dyes, etc., can be divided into reactive dyes, direct dyes, disperse dyes, vat dyes, ice dyes, acid dyes, etc. Dyes, sulfur dyes, cationic dyes, etc. At present, about 70% of the synthetic dyes used in the market in our country are based on the azo structure. However, its chemical properties are stable, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/32C02F1/28C02F101/30
CPCB01J20/06B01J20/226B01J20/28009B01J20/3204B01J20/3268C02F1/288C02F2101/308
Inventor 李艳霞李佳煌黄露陈毅挺娄本勇
Owner MINJIANG UNIV
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