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Dimer carboxyl adsorbent as well as preparation method and application thereof

A dimer and adsorbent technology, applied in the field of preparation and application of materials with carboxylic acid dimer, can solve the problems of decreased adsorption capacity, unstable structure, etc., achieves low temperature of water body, easy recovery and recycling, Solve the effect of unsatisfactory regeneration effect

Active Publication Date: 2021-05-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems that existing dicarboxylic acid polymer MOF materials are used in the treatment of wastewater containing heavy metals, the problems of desorption capacity, adsorption capacity decrease and structural instability are prone to occur in the process of recycling. The present invention provides a dimer carboxyl The adsorbent uses silica, porous resin, biochar, chitosan, activated carbon, and zeolite as the matrix. When desorbing, the temperature of the water body is low, which effectively ensures the recycling. Desorption capacity, adsorption capacity, and structural stability during the process;

Method used

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  • Dimer carboxyl adsorbent as well as preparation method and application thereof
  • Dimer carboxyl adsorbent as well as preparation method and application thereof
  • Dimer carboxyl adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] The SBA-15 material with a carboxylic acid dimer structure is prepared as follows: add SBA-15, 3-aminopropyltriethylsilane (APTES) and pyromellitic acid in a mass ratio of 4:4:1 to 150ml 100 DEG C in toluene solution heated and stirred to reflux for 2 h, filtered and washed twice with absolute ethanol, then washed several times with deionized water, dried at 80 DEG C to obtain SBA-15 material with carboxylic acid dimer (scanning electron microscope image Such as figure 1 shown).

[0107] Figure 4 It is the specific surface area figure of the SBA-15 material with carboxylic acid dimer structure prepared in the present embodiment, and the specific surface area is 780m 2 / g.

[0108] Using the SBA-15 material with a carboxylic acid dimer structure prepared in this example, the wastewater containing lead ions was treated to adjust the pH value of the influent to 4; the specific steps are as follows:

[0109] (1) Water inlet: Take 1 g of the prepared SBA-15 material wit...

Embodiment 2

[0114] The preparation process of SBA-15 with a carboxylic acid dimer structure in this example: SBA-15, 3-aminopropyltriethylsilane (APTES) and pyromellitic acid in a mass ratio of 4:8:2 Add 150ml of toluene solution to 100°C, heat, stir and reflux for 5 hours, filter and wash twice with absolute ethanol, then wash several times with deionized water, and dry at 80°C to obtain the SBA-15 material with carboxylic acid dimer;

[0115] The prepared SBA-15 with carboxylic acid dimer structure in this example has a specific surface area of ​​800m 2 / g; the average pore diameter of mesopores is 5.5nm.

[0116] Using the SBA-15 prepared in this example with a carboxylic acid dimer structure, the wastewater containing lead ions was treated to adjust the pH value of the influent to 6; the specific steps are as follows:

[0117] (1) Get 2g of prepared SBA-15 with a carboxylic acid dimer structure and pack it into a jacketed glass adsorption column. 2 The flow rate of h flows through t...

Embodiment 3

[0122] In this example, the preparation steps of the SBA-15 material with carboxylic acid dimer are as follows: SBA-15, 3-aminopropyltriethylsilane (APTES) and pyromellitic acid were mixed at a mass ratio of 4:10:4 Proportionally add 150ml of toluene solution to 100°C, heat, stir and reflux for 10 hours, filter and wash twice with absolute ethanol, then wash several times with deionized water, and dry at 80°C to obtain SBA-15 material with carboxylic acid dimer;

[0123] The prepared SBA-15 material with carboxylic acid dimer in this example has a specific surface area of ​​760m 2 / g; the average pore diameter of mesopores is 6nm.

[0124] Using the SBA-15 material with carboxylic acid dimer prepared in this example, the wastewater containing lead ions was treated to adjust the pH value of the influent to 8; the specific steps are as follows:

[0125] (1) Take 2 g of the prepared bifunctional group MOFs material and load it into a jacketed glass adsorption column, and the was...

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Abstract

The invention discloses a dimer carboxyl adsorbent as well as a preparation method and application thereof, and belongs to the technical field of water treatment. According to the present invention, the adsorption material such as silica, porous resin, biochar, chitosan, activated carbon and zeolite is adopted as the matrix, such that the required water body temperature is low during the desorption so as to effectively ensure the desorption capacity, the adsorption capacity and the structure stability during the recycling process.

Description

technical field [0001] The invention belongs to the field of sewage treatment of nanocomposite functional materials, and more specifically relates to the preparation and application of a carboxylic acid dimer material. Background technique [0002] Heavy metal pollutants generally have the characteristics of strong bioaccumulation, high toxicity, and difficulty in biodegradation, so zero discharge is an inevitable choice. Chemical precipitation is widely used in the removal of heavy metals in a variety of industrial wastewater, such as printing and dyeing wastewater, electroplating wastewater, mining wastewater, etc. However, the residual concentration of heavy metals in the wastewater treated by the chemical precipitation method is often 0.5-1.0mg / L, which is difficult to meet the increasingly stringent discharge standards. L; the effluent concentration of nickel and lead should be less than 0.1mg / L, etc. Therefore, after chemical precipitation, advanced treatment is requ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/16B01J20/20B01J20/22B01J20/24B01J20/26B01J20/30B01J20/34C02F1/28C02F101/20
CPCB01J20/103B01J20/265B01J20/24B01J20/20B01J20/16B01J20/226B01J20/3483C02F1/28C02F1/283C02F1/286C02F2303/16C02F2101/20C02F2101/203C02F2101/206B01J20/28059B01J20/28061B01J20/28066B01J20/2808B01J20/28083B01J20/3204B01J20/3208C02F1/285C02F1/288C02F2101/22C02F1/281C02F1/66B01J20/321B01J20/3212B01J20/3253B01J20/3206B01J20/3433B01J20/3475B01J20/3085B01J20/18
Inventor 张炜铭计成汉潘丙才花铭吕路
Owner NANJING UNIV
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