DGT adsorption film as well as preparation method and application thereof

An adsorption film and film forming technology, which is applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of large sample volume and affecting the accuracy of results, etc., to reduce adsorption and effectively While the effect of accurate determination, high binding rate and adsorption capacity

Active Publication Date: 2021-09-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the existing active sampling technology for sampling glucocorticoid compounds in water bodies, there are defects such as a large sample size required, and the monitoring process easily affects the accuracy of results. The DGT adsorption f

Method used

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  • DGT adsorption film as well as preparation method and application thereof
  • DGT adsorption film as well as preparation method and application thereof
  • DGT adsorption film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The adsorption film in the DGT device described in this example is made from PEP-2 resin particles (40-60 μm), and its preparation method includes the following steps:

[0080] (1) Activation of PEP-2 resin material

[0081] Methanol activation: add 30mL of methanol solvent to 20g of PEP-2 resin particles, shake up and down to make the methanol fully contact with the resin particles, then centrifuge at 3500r / min for 10 minutes, remove the supernatant, repeat the above steps twice to obtain sedimentation solid.

[0082]Cleaning with ultrapure water: add a certain volume of ultrapure water to the obtained deposited solid, shake it up and down so that the ultrapure water fully contacts the activated resin particles, then centrifuge at 3500r / min for 10 minutes, remove the supernatant, and repeat the above steps A precipitated solid was obtained after 3 steps.

[0083] (2) Preparation of PEP-2 adsorption membrane: Mix agar powder, activated PEP-2 resin and ultrapure water ...

Embodiment 2

[0089] In this example, the PEP-2 adsorption membrane prepared in Example 1, the agarose diffusion membrane and the polytetrafluoroethylene (PTFE) filter membrane were assembled into a DGT device to measure glucocorticoid compounds in water.

[0090] In this embodiment, the DGT device is used to monitor the glucocorticoid compounds in the water body in situ, and the specific monitoring steps are as follows:

[0091] (1) Placement of the DGT device: place the DGT device assembled in step (1) in an aqueous solution containing a certain concentration of glucocorticoid compounds, keep the aqueous solution in a fully stirred state during the DGT placement process, and record the placement process of the DGT device The temperature of the aqueous solution and the DGT storage time.

[0092] (2) Recovery and elution of the adsorption film: take out the placed DGT device, rinse the surface with ultrapure water, then use a crowbar to pry open the device, take out the adsorption film and ...

Embodiment 3

[0108] This example is basically the same as Example 2, except that the difference is that in this example, under the conditions of monitoring different ionic strengths, DGT technology is used to measure the influence of various glucocorticoid compounds in the water body, wherein the glucocorticoids in the water body to be tested The concentration of the compound is 10 μg / L, and the ionic strength (calculated as NaCl) of the aqueous solution to be tested is respectively: 0, 1, 10, 100, 500 mmol / L.

[0109] image 3 It is the adsorption effect diagram of the DGT device for various glucocorticoid compounds under different ionic strengths in this embodiment. The results show that the glucocorticoid concentration C measured by the DGT calculated according to the formula is DGT and the concentration of glucocorticoid compounds in aqueous solution (C soln ) ratio ranged from 0.9 to 1.1, indicating that the ionic strength of water had no significant effect on the results of DGT dete...

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Abstract

The invention discloses a DGT adsorption film and a preparation method and application thereof, and belongs to the field of material preparation and compound monitoring. The DGT adsorption film is prepared from activated functionalized polystyrene/divinylbenzene (PEP-2, 40-60 [mu]m) resin particles and an agarose film forming solution through gelation. The prepared PEP-2 adsorption membrane, an agarose diffusion membrane and a polytetrafluoroethylene (PTFE) filter membrane are sequentially stacked and assembled into a DGT device, and the DGT device can be used for in-situ monitoring of 16 natural and synthetic glucocorticoid-like compounds in a water body. The adsorption film has the advantages of being simple in structure, reasonable in design and easy to manufacture.

Description

technical field [0001] The invention belongs to the technical field of gradient diffusion films, and more specifically relates to a DGT adsorption film and its preparation method and application. Background technique [0002] Glucocorticoids are important steroid hormones commonly used to treat a variety of human diseases, including asthma, allergies, rhinitis, intestinal problems, and skin disorders, among others. Studies have found that glucocorticoids are finally excreted with feces and urine after oral administration by humans. A large amount of glucocorticoids and their metabolites enter WWTPs after human excretion, and some of them enter the natural environment through the discharge of wastewater from WWTPs. At present, glucocorticoid drugs have been widely detected in various natural water bodies and sewage treatment plants (Ai Jia., et al, Environ. Sci. Technol., 2016, 50, 2870-2880). It has been reported that some glucocorticoids will have adverse effects on aquati...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30G01N30/02G01N30/72
CPCB01J20/24B01J20/28033G01N30/02G01N30/72
Inventor 罗军颜鹂颍李彦莹
Owner NANJING UNIV
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