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A multi-stage porous ceramic material for photothermal seawater desalination, its preparation method and application

A porous ceramic, photothermal technology, applied in the field of solar seawater desalination, can solve the problems of low photothermal seawater desalination efficiency, poor thermal stability, complex process, etc., achieve excellent chemical stability, improve service life, and improve catalytic efficiency. Effect

Active Publication Date: 2022-06-24
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the defects of existing photothermal porous ceramic materials such as complex process, high cost, poor thermal stability, small pore size and low efficiency of photothermal seawater desalination, the present invention provides a porous ceramic material with a multi-level pore structure and a preparation method, Can be efficiently applied to photothermal seawater desalination

Method used

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  • A multi-stage porous ceramic material for photothermal seawater desalination, its preparation method and application
  • A multi-stage porous ceramic material for photothermal seawater desalination, its preparation method and application
  • A multi-stage porous ceramic material for photothermal seawater desalination, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First step powder preparation

[0041] With Al (100 mesh), TiO 2 (200 mesh), B 2 O 3 (100 mesh), Ti (200 mesh), B 4 C (1600 mesh), C 3 N 4 (500 mesh) powder as raw material, powder mass ratio: Al:TiO 2 :B 2 O 3 : Ti:B 4 C:C 3 N 4 =9:8:14:18:7:23, NH 4 HCO 3 The volume fraction of the powder was 0%, and the mixed powder was charged into a three-dimensional mixer and mixed for 8 hours.

[0042] The second step is compression molding

[0043]The mixed powder in the first step is compacted using a cylindrical mold with a diameter of 2 cm, the pressure is 100Mpa, and the pressure holding time is 5 minutes. 2-4 mm cylindrical sheet, after heating to remove the pore-forming agent to form macropores.

[0044] Step 3: Synthesis of Porous Ceramic Membranes

[0045] Turn on the power of the laser cladding equipment, set the laser power to 800W, and then use the laser beam to ignite the green body at the center of the green body surface to make the mixed powder gree...

Embodiment 2

[0050] Example 2 In addition to the first step of powder preparation, Al (100 mesh), TiO 2 (200 mesh), B 2 O 3 (100 mesh), Ti (200 mesh), B 4 C (1600 mesh), C 3 N 4 (500 mesh) powder mass ratio by: Al:TiO 2 :B 2 O 3 : Ti:B 4 C:C 3 N 4 =9:8:14:18:7:23,NH 4 HCO 3 The volume fraction of the powder is 0% and becomes: Al:TiO 2 :B 2 O 3 : Ti:B 4 C:C 3 N 4 =9:16:7:18:7:23,NH 4 HCO 3 The volume fraction of the powder is 10%, and other processes and parameters are the same as those in Example 1. The powder body reacts: Al+TiO 2 +B 2 O 3 +Ti+B 4 C+C 3 N 4 →TiO 2 +Al 2 O 3 +TiB 2 +TiC+Ti(C,N).

[0051] After testing, the porosity of the finally obtained photothermal porous ceramic material is 45.9%, and the pore size distribution of this material is 7-10 μm, 20-80 μm (see image 3 ), at the same time, the solar light absorption rate is 74.35%, and the water evaporation rate is 1.84 kg m -2 ·h -1 , about 4 times that of pure seawater, and the light-to-heat...

Embodiment 3

[0053] Example 3 In addition to the first step of powder preparation, Al (100 mesh), TiO 2 (200 mesh), B 2 O 3 (100 mesh), Ti (200 mesh), B 4 C (1600 mesh), C 3 N 4 (500 mesh) and powder mass ratio: Al:TiO 2 :B 2 O 3 : Ti:B 4 C:C 3 N 4 =9:8:14:18:7:23, NH 4 HCO 3 The volume fraction of the powder is 0% and becomes: Al:TiO 2 :B 2 O 3 :Ti:B 4 C:C 3 N 4 =9:8:7:18:7:27,NH 4 HCO 3 The volume fraction of the powder is 15%, and other processes and parameters are the same as those in Example 1. The powder body reacts: Al+TiO 2 +B 2 O 3 +Ti+B 4 C+C 3 N 4 →Al 2 O 3 +TiB 2 +TiC+Ti(C,N)+AlN. The XRD patterns of the synthesized photothermal porous ceramic materials are shown in figure 2 .

[0054] After testing, the final Figure 1a and Figure 1b The porosity of the photothermal porous ceramic material shown is 75%, and the pore size distribution of this material is 7-800 μm (see image 3 ), at the same time, the solar absorption rate is 85.09%, and the w...

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Abstract

The invention discloses a multi-stage porous ceramic material for photothermal seawater desalination and its preparation method and application. It uses Al, TiO2, B2O3, Ti, B4C, and C3N4 powders as raw materials and adds different volume fractions of N elements. The pore-forming agent is then used to initiate a self-propagating reaction with a laser beam. The main phase composition is Al2O3+TiB2+Ti(C,N)+TiC or + a small amount of TiO2 or + a small amount of B2O3 or + a small amount of AlN. The invention overcomes the defects of complex process, high cost, poor thermal stability, small aperture and low photothermal seawater desalination efficiency of the existing photothermal porous ceramic materials.

Description

technical field [0001] The invention relates to the field of solar seawater desalination, in particular to a porous material with a multi-level structure and a preparation method and application thereof. The photothermal porous ceramic material of the invention can achieve relatively efficient light absorption by using the interface photothermal conversion technology. The stability of use has laid a good foundation. Background technique [0002] With the acceleration of the global industrialization process, the shortage of energy and freshwater resources is becoming more and more serious. The abundant seawater resources make seawater desalination technology one of the important means to solve the global freshwater resource crisis. However, due to the complex equipment, high operating cost, high energy consumption and low efficiency of conventional seawater desalination technology, its wide application is limited, and it also aggravates the situation of energy shortage. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/56C04B35/622C02F1/14C02F103/08
CPCC04B38/0645C04B35/5611C04B35/622C02F1/14C04B2235/3217C04B2235/3409C04B2235/3813C04B2235/3852C04B2235/665C02F2103/08C04B38/0074C04B38/0054Y02A20/212
Inventor 崔洪芝徐瑞琪魏娜李健赵明岗
Owner OCEAN UNIV OF CHINA