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Three-dimensional porous MXene assembly, preparation method and application thereof

A three-dimensional porous and assembled technology, applied in the direction of mixing methods, chemical instruments and methods, transportation and packaging, etc., can solve the problems that are difficult to meet the requirements of efficient treatment of landfill leachate, and achieve good photocatalytic degradation of landfill leachate performance, The effect of large specific surface area and simple treatment process

Pending Publication Date: 2021-01-05
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been many studies on three-dimensional porous MXene materials, it is still difficult to meet the requirements of efficient treatment of landfill leachate with complex components.

Method used

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  • Three-dimensional porous MXene assembly, preparation method and application thereof
  • Three-dimensional porous MXene assembly, preparation method and application thereof
  • Three-dimensional porous MXene assembly, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Take 10mg Ti 3 C 2 Phase MXene was added to deionized water, and 2 mg / mL MXene aqueous dispersion was prepared by ultrasonic dispersion; 10 mg / mL AgNO was added dropwise at 1000 rpm 3 Aqueous solution, in situ construction of Ag / TiO by redox reaction 2 / MXene composite catalyst, where AgNO 3 The mass ratio to MXene is 1:8.

[0040] (2) Add 20 mg of SA into deionized water, heat and stir at 80°C to prepare a 4 mg / mL SA aqueous solution.

[0041] (3) 5mL of the Ag / TiO 2 / MXene dispersion and 5mL of the SA aqueous solution were mixed, stirred at 200rpm for 20min; 2 in a 100mL beaker, chemically cross-linked for 4h, then placed in liquid nitrogen for quick freezing for 10min, and freeze-dried for 24h under vacuum to obtain Ag / TiO 2 / MXene / SA assembly.

[0042] (4) the above Ag / TiO 2 The / MXene / SA assembly is placed on the absorbent fiber paper (absorbent material 3) in the landfill leachate treatment system, and the light intensity is 1500W / m 2 The above-mentio...

Embodiment 2

[0044] (1) Take 10mg Ti 3 C 2 Phase MXene was added to deionized water, and 2mg / mL MXene aqueous dispersion was prepared by ultrasonic dispersion; 30mg / mL AgNO was added dropwise at 1000rpm 3 Aqueous solution, in situ construction of Ag / TiO by redox reaction 2 / MXene composite catalyst, where AgNO 3 The mass ratio to MXene is 1:4.

[0045] (2) Add 20 mg of SA into deionized water, heat in a constant temperature water bath at 80°C, and stir magnetically to prepare a 4 mg / mL SA aqueous solution.

[0046] (3) 5mL of the Ag / TiO 2 / MXene dispersion and 5mL of the SA aqueous solution were mixed, stirred at 200rpm for 20min; 2 in a 100mL beaker, chemically crosslinked for 4h, then placed in liquid nitrogen for 10min, and then freeze-dried for 24h under vacuum to obtain a three-dimensional porous Ag / TiO 2 / MXene / SA assembly with an average pore size of 110 μm.

[0047] (4) the above Ag / TiO 2 The / MXene / SA assembly is placed on the absorbent fiber paper in the landfill leachate...

Embodiment 3

[0049] (1) Take 10mg Ti 3 C 2 Phase MXene was added to deionized water, and 2 mg / mL MXene aqueous dispersion was prepared by ultrasonic dispersion; 40 mg / mL AgNO was added dropwise at 500 rpm 3 Aqueous solution, in situ construction of Ag / TiO by redox reaction 2 / MXene composite catalyst, where AgNO 3 The mass ratio to MXene is 1:2.

[0050] (2) Add 40 mg of SA into deionized water, heat in a constant temperature water bath at 70°C, and magnetically stir to prepare an 8 mg / mL SA aqueous solution.

[0051] (3) 5mL of the SA aqueous solution and 5mL of the Ag / TiO 2 / MXene dispersion mixed, stirred at 200rpm for 15min; the above mixed solution was quickly poured into 2mL, 1wt% CaCl 2 in a 100mL beaker, chemically crosslinked for 2h, then placed in liquid nitrogen for quick freezing for 8min, and freeze-dried for 24h under vacuum to obtain Ag / TiO 2 / MXene / SA assembly.

[0052] (4) the above Ag / TiO 2 The / MXene / SA assembly is placed on the absorbent fiber paper in the landf...

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Abstract

The invention relates to a three-dimensional porous MXene assembly, a preparation method and application thereof, and relates to the field of landfill leachate treatment. The preparation method of thethree-dimensional porous MXene assembly comprises the steps of: adding an AgNO3 solution with a concentration of 10-50mg / mL into an MXene aqueous dispersion with a concentration of 0.5-10mg / mL to obtain an Ag / transition metal oxide / MXene dispersion, wherein the mass ratio of AgNO3 to MXene is 1:10-2:1; and mixing the obtained Ag / transition metal oxide / MXene dispersion liquid with a sodium alginate solution with a concentration of 1-10mg / mL, performing stirring, then putting the mixture into a mold filled with a metal ion cross-linking agent, carrying out cross-linking reaction, freezing the cross-linked product in liquid nitrogen for 5-20min, and carrying out vacuum freeze drying to obtain the three-dimensional porous MXene assembly. The obtained assembly has a three-dimensional porous foam structure, and is large in specific surface area, good in hydrophilicity and excellent in light absorption performance.

Description

technical field [0001] The invention relates to a three-dimensional porous MXene assembly and its preparation method and application, and the invention relates to the field of landfill leachate treatment. Background technique [0002] With the rapid development of my country's economy and the continuous advancement of urbanization, the urban population continues to increase, and the amount of municipal solid waste is also increasing year by year. According to the 2018 Statistical Yearbook, in 2017, the volume of municipal solid waste cleared and transported reached 215 million tons, of which 120 million tons were disposed of in a sanitary landfill, accounting for 57.2% of the volume of harmless disposal of waste. The sanitary landfill treatment method is the most widely used and most mature domestic waste treatment method in my country. However, a large amount of landfill leachate is produced during the sanitary landfill treatment process. Landfill leachate has complex comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J23/50B01F3/08B01F11/02B01J19/00C02F1/04C02F1/30B01F13/10C02F103/06
CPCB01J27/22B01J23/50B01J19/0006C02F1/048C02F1/30C02F2103/06C02F2209/08B01F23/405B01F23/49B01F31/80B01F31/89B01F33/8362B01J35/39
Inventor 李长平王方娴郭娟璇王玉伟宋浩然
Owner DONGGUAN UNIV OF TECH
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