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Application of lithium niobate pyroelectric material in atmospheric particulate adsorption on basis of temperature control

A technology of atmospheric particulate matter and lithium niobate, applied in the direction of electrostatic effect separation, electrode cleaning, electrostatic separation, etc., can solve the problems of reduced adsorption efficiency, complicated electrification process, and restrictions on the application of organic electret filter materials, and achieve wear resistance Effects of performance improvement and simplification of charging process

Active Publication Date: 2015-12-30
北京中科艾加科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production process of electret filter fiber has high requirements, and the electrification process is complicated, and due to the neutralization of charged charges in atmospheric particles or the shielding effect of electrostatic force generated by particle deposition, the surface charge of the filter material decays quickly, and the adsorption Reduced efficiency, poor moisture and heat resistance, easy aging, etc., and fire protection requirements must use non-combustible materials and materials that do not produce toxic gases during fires, etc., which largely limit the application of organic electret filter materials

Method used

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  • Application of lithium niobate pyroelectric material in atmospheric particulate adsorption on basis of temperature control
  • Application of lithium niobate pyroelectric material in atmospheric particulate adsorption on basis of temperature control
  • Application of lithium niobate pyroelectric material in atmospheric particulate adsorption on basis of temperature control

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, determination of optimum adsorption temperature of lithium niobate

[0041] The strength of the pyroelectric effect can be expressed by the pyroelectric coefficient. The formula for the change of polarization and the change of pyroelectric temperature is as follows: ΔP=pΔT (p is the pyroelectric coefficient, ΔT is the change of crystal temperature, and ΔP is the change of polarization). In principle, as long as there is a temperature difference, the surface of the lithium niobate material can be charged. Due to the large thickness of the lithium niobate wafer, the surface potential of the lithium niobate wafer cannot be directly characterized by the electrostatic force microscope. Therefore, the surface potential can be indirectly characterized by the amount of adsorption on the negatively charged PS balls at different temperatures, and the best Optimum pyroelectric temperature.

[0042] Cut the lithium niobate pyroelectric material into 13 small pieces ...

Embodiment 2

[0045] Embodiment 2, lithium niobate storage capacity

[0046] Cut several pieces of lithium niobate wafers with the same area (1cm×2cm), clean them, put them in a clean Petri dish, and put them in an oven at the same time. After heating to 100°C, take them out after the oven temperature drops to room temperature. Then take out one piece every 24 hours for adsorption experiment, and record and observe the change of adsorption amount. This method ensures that each piece of lithium niobate is naturally attenuated under the same initial conditions.

[0047] image 3 It is the adsorption graph of PS pellets on lithium niobate wafers with the same initial heating condition (100°C) after heating for 1h (the time for cooling to room temperature in the oven), 25h, 73h and 121h. Among them, Figures (a) to (d) correspond to the adsorption diagrams of lithium niobate wafers on PS pellets at 1h, 25h, 73h and 121h after heating, respectively.

[0048] It can be seen from the figure that ...

Embodiment 3

[0049] Embodiment 3, pyroelectric properties of lithium niobate wafer

[0050] Due to the large thickness of lithium niobate crystals, the surface charge generated by pyroelectricity cannot be characterized by the method of measuring the surface potential by atomic force. Therefore, the present invention uses lithium niobate for the adsorption of negatively charged polystyrene pellets Indirectly characterize its surface potential. Under different heating conditions, lithium niobate can adsorb PS pellets with a particle size of 300 μm.

[0051] Figure 4 It is the adsorption diagram of lithium niobate heated to different temperatures on PS pellets. Wherein, a, b, and c correspond to the temperatures of the heated lithium niobate being 100° C., 150° C. and 200° C., respectively.

[0052] It can be seen from the figure that the heated lithium niobate has a large amount of positive charge on the surface, has a strong Coulomb effect, and shows a strong adsorption effect on PS pe...

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Abstract

The invention provides application of a lithium niobate pyroelectric material in atmospheric particulate adsorption on the basis of temperature control and a method for adsorbing atmospheric particulates with lithium niobate as an air filtering material. The lithium niobate releases charges under heating temperature difference stimulation, and the atmospheric particulates are adsorbed. The temperature of the heated lithium niobate is 30-150 DEG C, the preferred temperature is 80-150 DEG C, and the optimal temperature is 100 DEG C. The method further includes the steps that after particulate adsorption is saturated, the lithium niobate pyroelectric material is washed with water to remove the adsorbed particulates, and heating is carried out again so that charge release and adsorption can be carried out on the particulates repeatedly. The lithium niobate can generate sufficient electrostatic adsorption force during heating, dust, PM10, PM2.5 and submicron particulate matter in air are effectively adsorbed, and dielectric loss is small under the temperature action, so that the lithium niobate pyroelectric material can be repeatedly charged, charges can be stored stably, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of electret air purification, and in particular relates to the application of a lithium niobate pyroelectric material based on temperature control in adsorbing atmospheric particles. Background technique [0002] The emergence and continuation of smog has seriously affected people's daily life and brought great harm to people's health, which has aroused widespread concern and attention from the society. Haze includes two meanings of fog and haze: fog is an aerosol system composed of a large number of tiny water droplets or ice crystals suspended in the air near the surface, which mostly occurs in autumn and winter, and is the condensation (or sublimation) of water vapor in the air near the surface. Haze is composed of particles such as dust, sulfuric acid, nitric acid, and organic hydrocarbons in the air. Smog is mainly composed of sulfur dioxide, nitrogen oxides, and inhalable particulate matter. The first two are g...

Claims

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Application Information

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IPC IPC(8): B03C3/28B03C3/78
Inventor 关丽高迪高雪张美宁
Owner 北京中科艾加科技有限公司
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