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Hydrophobic carbon quantum dot mofs composite adsorbent and preparation method thereof

A composite adsorption and carbon quantum dot technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of reducing MOFs adsorption of VOCs and MOFs skeleton collapse, so as to increase the proportion of micropore area and improve hydrophobicity , good effect

Active Publication Date: 2022-05-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The higher the concentration of water vapor, the more water molecules will be adsorbed into the pores of MOFs, thereby reducing the ability of MOFs to adsorb VOCs.
In addition, after too many water molecules coordinate with the metal, it is possible to dissociate the coordination bond between the metal and the ligand in the MOFs secondary unit structure through competitive coordination, resulting in the collapse of the MOFs skeleton.

Method used

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  • Hydrophobic carbon quantum dot mofs composite adsorbent and preparation method thereof
  • Hydrophobic carbon quantum dot mofs composite adsorbent and preparation method thereof
  • Hydrophobic carbon quantum dot mofs composite adsorbent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A kind of hydrophobic carbon quantum dot MOFs composite adsorbent and preparation method thereof, comprising the following steps,

[0038] (1) 0.05mol CrNO 3 9H 2 0 and 0.005mol citric acid monohydrate were uniformly dispersed in 25mL ultrapure water to obtain solution A;

[0039] (2) Then slowly add 0.05mol terephthalic acid into solution A, and stir for 40 minutes to obtain solution B;

[0040] (3) After solution B is added dropwise the aqueous solution containing 0.002mol hydrogen fluoride, it is transferred to the reactor, rinses the beaker with four milliliters of water, and then carries out hydrothermal synthesis with a program temperature control box, as follows:

[0041] (a) Heating process: to 200°C at a heating rate of 1°C / min;

[0042] (b) Constant temperature process: keep at 200°C for 8 hours;

[0043] (c) Cooling process: reduce the temperature to 30-40°C at a cooling rate of 1-10°C / min.

[0044] After cooling down, transfer to a centrifuge tube, separa...

Embodiment 2

[0046] A kind of hydrophobic carbon quantum dot MOFs composite adsorbent and preparation method thereof, comprising the following steps,

[0047] (1) 0.05mol CrNO 3 9H 2 0 and 0.005mol citric acid monohydrate were uniformly dispersed in 20mL ultrapure water to obtain solution A;

[0048] (2) Then slowly add 0.05mol terephthalic acid into solution A, and stir for 30 minutes to obtain solution B;

[0049] (3) After solution B is added dropwise the aqueous solution containing 0.002mol hydrogen fluoride, it is transferred to the reactor, rinses the beaker with four milliliters of water, and then carries out hydrothermal synthesis with a program temperature control box, as follows:

[0050] (a) Heating process: to 220°C at a heating rate of 1°C / min;

[0051] (b) Constant temperature process: keep at 220°C for 8 hours;

[0052] (c) Cooling process: drop to 30°C at a cooling rate of 1°C / min.

[0053] After cooling down, transfer to a centrifuge tube, separate the supernatant aft...

Embodiment 3

[0055] A kind of hydrophobic carbon quantum dot MOFs composite adsorbent and preparation method thereof, comprising the following steps,

[0056] (1) 0.05mol CrNO 3 9H 2 0 and 0.01mol citric acid monohydrate were uniformly dispersed in 45ml ultrapure water to obtain solution A;

[0057] (2) Then slowly add 0.05mol terephthalic acid into solution A, and stir for 60 minutes to obtain solution B;

[0058] (3) After solution B is dripped with an aqueous solution containing 0.006mol hydrogen fluoride, it is transferred to the reactor, and then the hydrothermal synthesis is carried out with a program temperature control box, as follows:

[0059] (a) Heating process: to 210°C at a heating rate of 5°C / min;

[0060] (b) Constant temperature process: keep at 210°C for 8 hours;

[0061] (c) Cooling process: drop to 40°C at a cooling rate of 5°C / min.

[0062] After cooling down, transfer to a centrifuge tube, separate the supernatant after centrifugation, add DMF to wash, recirculate...

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Abstract

The invention discloses a preparation method of a hydrophobic carbon quantum dot MOFs composite adsorbent, specifically, CrNO 3 9H 2 0 and citric acid monohydrate are uniformly dispersed in water at a molar ratio of 5-20:1 to obtain solution A; then terephthalic acid is added to solution A and stirred evenly to obtain solution B, and then a small amount of After hydrofluoric acid, transfer to a reaction kettle, and then carry out hydrothermal synthesis at a temperature of 200-220°C. The reaction duration is 8-10h. After cooling down, centrifuge, wash, and dry to obtain hydrophobic carbon quantum dots MOFs composite adsorbent. The present invention adopts a one-step in-situ preparation method, and the obtained adsorbent has a relatively high specific surface area, and the addition of citric acid affects the coordination of terephthalic acid and Cr, thereby affecting the interaction between carbon quantum dots and the MOFs skeleton, Influence the crystal growth of MOFs, effectively improve the hydrophobicity of the final adsorbent and the adsorption capacity of aromatic VOCs at low concentrations.

Description

technical field [0001] The invention belongs to the field of novel functional materials, and in particular relates to the preparation of hydrophobic carbon quantum dot composite adsorbent. Background technique [0002] Metal-organic framework materials (MOFs), with huge specific surface area and adjustable pore structure, are a new type of porous adsorption material that has attracted the most attention at home and abroad in the past two decades, and are constantly refreshing the adsorption capacity of several types of typical VOCs. highest record. Relevant research reports show that MOFs materials will have great development potential and application prospects in the field of VOCs pollution control in the future. However, in recent years, researchers have found that MOFs materials with strong adsorption capacity for VOCs in many laboratories have low adsorption efficiency when the concentration of VOCs is very low, such as MIL-101 (Cr), and other MOFs with smaller pores I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28B01J20/22B01J20/30B01D53/02
CPCB01J20/226B01J20/20B01D53/02B01J20/28066B01J20/28004B01J20/28007B01D2257/708Y02A50/20
Inventor 赵祯霞包靓钰赵钟兴
Owner GUANGXI UNIV
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