Preparation method and application of ceramic membrane diffusion layer prepared by using yttrium-stabilized zirconia material

A yttrium-stabilized zirconia and ceramic membrane technology, applied in the field of passive sampling of gradient diffusion films, can solve the problems of large mass transfer resistance, influence on the accuracy of measurement results, easy damage, etc., achieve high mechanical strength, overcome long-term exposure to be degraded by microorganisms Effect

Inactive Publication Date: 2019-11-08
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In order to avoid this problem, most of the relevant studies use the screening comparison method to select a filter layer that is inert to the target substance. However, different types of compounds have different adsorption characteristics in different organic polymers, and the DGT for each type of pollutant is established. Each method has a large workload of screening
Agarose gel is often used as the diffusion layer in the DGT sampling technique for trace organic pollutants. This diffusion layer has low strength and is easily damaged. When it is applied in the field water environment, there is also the risk of being degraded or eaten by microorganisms, which will The thickness of the diffusion layer is reduced, which affects the normal sampling process of DGT
In addition, when applied in a water environment with a low water flow velocity, the boundary diffusion layer formed on the surface of the agarose diffusion layer has a large mass transfer resistance for the target substance into the DGT, which will greatly improve the accuracy of the DGT method. influences

Method used

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  • Preparation method and application of ceramic membrane diffusion layer prepared by using yttrium-stabilized zirconia material
  • Preparation method and application of ceramic membrane diffusion layer prepared by using yttrium-stabilized zirconia material
  • Preparation method and application of ceramic membrane diffusion layer prepared by using yttrium-stabilized zirconia material

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Effect test

Embodiment 1

[0039] The preparation process of the ceramic membrane diffusion layer is as follows: First, inject absolute ethanol into the yttrium-stabilized zirconia powder, add zirconia ball mills, and then perform a high-speed ball mill in a horizontal mixer for 12 hours to disperse the powder evenly, and then dry the anhydrous ethanol in an oven. Dried and ground. Take 5g of pretreated zirconia powder, add 1mL of polyvinyl alcohol solution with a mass fraction of 5% as a binder, grind to make it fully mixed, accurately weigh 1.50g, and move it to a tableting mold with an inner diameter of 25mm. The tablet press presses it into a tablet sample, and slowly pressurizes to 10MPa during the pressing process, and slowly releases the pressure after maintaining for 1min. Afterwards, the prepared sample pieces were placed in a box-type high-temperature sintering furnace and calcined at 700 and 1050 °C for 2 h, respectively. The sample sintering procedure is as follows: firstly, the temperature...

Embodiment 2

[0041]Ceramic membrane diffusion layer prepared by the present invention, polyvinylidene fluoride filter membrane and polycarbonate filter membrane are submerged in 10mL containing 20 μ g / L 6 kinds of organic pollutants (simazine, atrazine, acetochlor, metolachlor, thiamethoxam, triadiazole) solution, placed in a shaking incubator for 12 hours of vigorous shaking adsorption, using ultra-high performance liquid chromatography tandem mass spectrometry to measure the concentration changes of organic pollutants in the solution before and after adsorption. The adsorption of six kinds of organic pollutants by the ceramic membrane diffusion layer and two organic polymer filter membranes is as follows: figure 2 shown. The results showed that the diffusion layer of the ceramic membrane had no obvious adsorption on the 6 kinds of organic pollutants, while the adsorption ratio of the polycarbonate filter membrane to all pollutants in the solution was higher than 50%, and the polyvinylid...

Embodiment 3

[0043] A DGT sampler equipped with a ceramic membrane diffusion layer was exposed to 10 L of a solution containing 10 μg / L of organic pollutants. During the exposure period, a mechanical stirrer was used to stir the water rapidly to keep the water in a turbulent state. On the first to sixth days of sampling, 3 DGTs were taken out and removed. Determination of the adsorption amount in the adsorption layer, the extraction quality of the organic pollutants in the ceramic membrane diffusion layer DGT at different sampling times is as follows: image 3 shown. The results showed that the ceramic membrane diffusion layer DGT showed a linear increase in the amount of organic pollutants extracted during the 6-day sampling period, which proved that the ceramic membrane diffusion layer can limit the diffusion of organic pollutants and meet the requirements of DGT. Conditions apply.

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Abstract

The invention belongs to the technical field of gradient diffusion films, and provides a preparation method and application of a ceramic membrane diffusion layer prepared by using an yttrium-stabilized zirconia material. The average pore diameter of the ceramic membrane diffusion layer is 85nm, the porosity is 31%, the diameter is 25mm, the thickness is 1.0mm, and the ceramic membrane diffusion layer is assembled into a diffusive gradients in thin-films (DGT) passive sampler for controlling the diffusion rate of pollutants. The ceramic membrane diffusion layer has adsorption inertness to organic pollutants, and compared with an organic polymer filter layer, the ceramic membrane diffusion layer has the advantages that organic target substances cannot be adsorbed on the surface. The ceramicmembrane diffusion layer provided by the invention has high mechanical strength, does not need to be protected by a filter layer, and can overcome the potential problems that an agarose gel diffusionlayer is degraded by microorganisms after being exposed for a long time. When the ceramic membrane diffusion layer is applied in a water body environment with lower flow velocity, correction of a boundary diffusion layer is not needed.

Description

technical field [0001] The invention belongs to the technical field of passive sampling of gradient diffusion films (diffusive gradients in thin-films, DGT), and relates to a method for preparing a ceramic film diffusion layer by using yttrium-stabilized zirconia material. Background technique [0002] The sample collection and analysis technology of trace organic pollutants is the frontier and hot field of research in recent years. Conventional active sampling methods need to consume a lot of manpower and material resources, and the samples can only reflect the instantaneous concentration of pollutants. The passive sampling method has the characteristics of simple sampling process and convenient operation, and can complete the enrichment of pollutants at the same time during the sampling period, so it has broad application prospects in the field of environmental monitoring. DGT is an in-situ dynamic passive sampling technique. Compared with other passive sampling techniques...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622C04B38/00G01N1/20
CPCC04B35/48C04B35/622C04B38/00C04B2235/3225C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/95G01N1/20C04B38/0074
Inventor 陈景文解怀君董应超
Owner DALIAN UNIV OF TECH
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