Method for preparing micro-mesopore XAD-2 by low temperature plasma

A technology of XAD-2 and low-temperature plasma, which is applied in the field of plasma preparation of micro-mesoporous XAD-2, can solve the problems of matrix performance damage, damage to raw material body performance, etc., and achieve low cost, enhanced self-binding force, and increased specific surface area. Effect

Active Publication Date: 2019-10-18
奕东电子科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of preparing micro-mesoporous materials by deposition method, acid-base modification method and sintering method, the matrix properties of raw materials are damaged to varying degrees, and the bulk properties of raw materials are damaged.

Method used

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  • Method for preparing micro-mesopore XAD-2 by low temperature plasma
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  • Method for preparing micro-mesopore XAD-2 by low temperature plasma

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Embodiment 1

[0031] A method for preparing micro-mesoporous XAD-2 by low-temperature plasma, the raw material pretreatment is as follows: the raw material XAD-2 is placed in a bottle of absolute ethanol solution, and oscillated 3-5 times in an ultrasonic oscillator, each oscillation is 20 -30min to fully remove the impurities on the surface of XAD-2 and restore XAD-2 to a wet state, then wash it with deionized water several times until it becomes neutral, and finally place it in a vacuum drying oven at 80-120°C for 12 -24h, the pretreated XAD-2 was obtained.

[0032] In this embodiment, the selected parameters are as follows: the oscillation frequency of the ultrasonic oscillator is 40kHz, the oscillation time is 20min, the number of oscillations is 3 times, the number of times of washing with deionized water is 7 times, the temperature of the vacuum drying oven is 100°C, and the drying time For 16h, the pretreated XAD-2 sample was obtained. Set the voltage of the high-voltage nanosecond ...

Embodiment 2

[0045] In this embodiment, the selected parameters are as follows: XAD-2 soaked in absolute ethanol is oscillated with an ultrasonic oscillator, the oscillation frequency is set to 20kHz, the oscillation time is 30min, and the number of oscillations is 5 times, and then washed with deionized water 10 times, the washed XAD-2 was dried in a vacuum drying oven, the temperature of the drying oven was set at 120°C, and the drying time was 12 hours to obtain a pretreated XAD-2 sample. Set the voltage of the high-voltage nanosecond bipolar narrow pulse plasma triggering power supply to 20kV, the frequency to 200Hz, the pulse width to 60ns, and the rising edge time to 10ns to discharge the pretreated XAD-2 for 10 minutes to obtain a new micro-mesoporous XAD- 2, such as Figure 7 As shown, and has a good adsorption effect on naphthalene, such as Figure 8 shown.

Embodiment 3

[0047] In this embodiment, the selected parameters are as follows: XAD-2 soaked in absolute ethanol is oscillated with an ultrasonic oscillator, the oscillation frequency is set to 25kHz, the oscillation time is 25min, the number of oscillations is 4 times, and then washed with deionized water 8 times, the washed XAD-2 was dried in a vacuum drying oven, the temperature of the drying oven was set at 80°C, and the drying time was 24 hours to obtain a pretreated XAD-2 sample. Set the voltage of the high-voltage nanosecond bipolar narrow pulse plasma trigger power supply to 25kV, the frequency to 180Hz, the pulse width to 75ns, and the rising edge time to 15ns to discharge the pretreated XAD-2 for 3min, 5min...25min to obtain a new Micro-mesoporous XAD-2, the prepared micro-mesoporous XAD-2 has a good adsorption effect on naphthalene.

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Abstract

The invention discloses a method for preparing micro-mesopore XAD-2 by low-temperature plasma, and belongs to the technical field of semi-volatile organic gas treatment. According to the method, a high-voltage nanosecond bipolar narrow pulse plasma triggering power supply is used to drive a packed bed discharge to generate the low-temperature plasma to modify XAD-2, XAD-2 contains a large number of micro-mesopores is prepared, a specific surface of XAD-2 is increased, adsorption of PAHs pollutants and XAD-2 is enhanced, and dispersion of PAHs is effectively improved. At the same time, new acidic oxygen-containing groups are increased on the surface of XAD-2, surface chemisorption activity of XAD-2 is improved, and the adsorption performance for low concentration naphthalene of XAD-2 is remarkably improved. The method has the advantages of convenient operation and low cost, and can be used for preparing sampling products such as XAD-2 adsorption tubes for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of semi-volatile organic gas treatment, in particular to a method for preparing micro-mesoporous XAD-2 (Amberlite XAD-2 macroporous adsorption resin) by low-temperature plasma. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants that widely exist in the environment. They are highly toxic and have serious "three properties". posed a serious threat. In recent years, more and more researchers have explored many removal methods. Among the many treatment methods, the adsorption method has become one of the main methods to purify PAHs in the environment due to its advantages of low cost, strong operability, and efficient removal of trace pollutants. Porous adsorption resin XAD-2 has become a research hotspot in the field of pollutant detection due to its excellent properties, such as high cost performance, simple preparation, large specific surface ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2257/70B01J20/26B01J20/28078B01J20/30
Inventor 杨德正徐庆南王红丽袁皓乔俊杰李瑶周雄峰梁建平
Owner 奕东电子科技股份有限公司
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