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Method for degrading organic dye based on pyroelectric effect of phase change

An organic dye, pyroelectric technology, applied in chemical instruments and methods, water pollutants, electrochemical water/sewage treatment, etc. Easy to achieve and improve the effect of degradation efficiency

Inactive Publication Date: 2021-01-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as the use of physical methods such as activated carbon adsorption, ultrafiltration, reverse osmosis, etc., but this method only transfers the dye from the liquid phase to the solid phase, which is likely to cause secondary pollution; the catalytic material used in the chemical method can only be used once and cannot be recycled; The scope of application of biological methods is limited; the widely used photocatalytic method has problems such as wide band gap and low utilization rate of sunlight

Method used

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  • Method for degrading organic dye based on pyroelectric effect of phase change
  • Method for degrading organic dye based on pyroelectric effect of phase change
  • Method for degrading organic dye based on pyroelectric effect of phase change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The degradation process of the present embodiment comprises the steps:

[0029] Measure 50mL of 20mg / L rhodamine B solution, add 50mg of BZT-0.6BCT powder, let it stand for adsorption in a dark place for 30min, take a blank sample, corresponding figure 1 Sample number 0 in

[0030] Three sets of comparative experiments were carried out, namely only mechanical stirring, only changing the temperature, and mechanical stirring and changing the temperature at the same time; among them, mechanical stirring caused piezoelectric polarization of the BZT-0.6BCT powder; changing the temperature made the BZT-0.6BCT powder A phase change occurs, and the organic dyes in the sewage are degraded through the polarized charge caused by the phase change.

[0031] The first group of samples was stirred at a constant speed to make the BZT-0.6BCT powder produce piezoelectric polarization.

[0032] For the second group of samples, the temperature was changed, and the sample was heated in a ...

Embodiment 2

[0042] The degradation process of the present embodiment comprises the steps:

[0043] Measure 50mL 20mg / L rhodamine B solution, add 50mg BZT-0.2BCT powder, let stand for 30min to absorb, take blank sample, corresponding figure 2 The sample number 0 in the sample; and using the same method as in Example 1 to carry out three groups of comparative tests respectively.

[0044] Such as figure 2 As shown, the BZT-0.2BCT powder can achieve the effect of degrading the organic dye rhodamine B through the pyroelectric effect, and the effect is more obvious when the pyroelectric effect and the piezoelectric effect work together, which is better than that of Example 1.

Embodiment 3

[0046] In this embodiment, the values ​​of x are respectively taken as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9; the degradation process is the same as in Example 1, and 9 phase change cycles are carried out, and the recycled sewage is taken for detection.

[0047] Table 2 below shows the degradation results of BZT-xBCT powders with different x values ​​after degradation treatment. It can be seen that when x is in the range of 0.2 to 0.6, the combined effect of pyroelectric effect and piezoelectric effect is remarkable.

[0048] Table 2

[0049]

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Abstract

The invention discloses a method for degrading organic dye based on a pyroelectric effect of phase change. The method comprises the following steps: adding a lead-free piezoelectric material BZT-xBCTinto organic dye sewage, changing the temperature in a range near room temperature to enable the lead-free piezoelectric material BZT-xBCT to generate phase change, and degrading the organic dye in the sewage through polarized charges caused by the phase change. The degradation method provided by the invention has no secondary pollution, is suitable for industrial production, and has important significance for degradation of organic dyes in sewage.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for degrading organic dyes based on the pyroelectric effect of phase change. Background technique [0002] With the improvement of human living standards, many industries closely related to human life, such as clothing, printing, and food, are also developing at a high speed, but at the same time, printing and dyeing wastewater containing a large amount of organic substances is also produced. Most organic dyes have stable chemical properties and high solubility in water, which makes it difficult to develop sewage treatment processes in actual production. So far, various physical, chemical and biological methods have been used to remove organic dyes from sewage. Such as the use of physical methods such as activated carbon adsorption, ultrafiltration, reverse osmosis, etc., but this method only transfers the dye from the liquid phase to the solid phase, which is likely to caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72C02F101/30
CPCC02F1/46C02F1/72C02F2101/308C02F2305/023
Inventor 王增梅邹雪雪朱睿健
Owner SOUTHEAST UNIV
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