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Preparation method of activated carbon adsorption film and method for measuring bisphenol substances in wetland soil or sediment based on thin-film diffusion gradient technique

A technology of activated carbon adsorption and bisphenols, applied in the fields of environmental science and earth science, can solve the problems of narrow application range, poor elution effect, immature measurement technology, etc., and achieve the effect of large adsorption capacity, long shelf life and strong toughness

Inactive Publication Date: 2015-04-08
NANJING UNIV
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Problems solved by technology

[0007] Aiming at the problems of immature determination technology, poor elution effect and narrow scope of application of bisphenols in wetland soil or sediment in the prior art, the present invention provides a method for preparing an activated carbon adsorption film and determination based on gradient diffusion film technology For the method of bisphenols in wetland soil or sediment, select activated carbon with particles less than 50 μm as the adsorbent and form a film with agar gel to make an activated carbon adsorption film, and assemble it with agar diffusion membrane and polytetrafluoroethylene filter membrane to form a DGT device , after nitrogen pretreatment, placed in the wetland soil or sediment to be tested, realized the determination of bisphenols in wetland soil or sediment by DGT technology

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  • Preparation method of activated carbon adsorption film and method for measuring bisphenol substances in wetland soil or sediment based on thin-film diffusion gradient technique
  • Preparation method of activated carbon adsorption film and method for measuring bisphenol substances in wetland soil or sediment based on thin-film diffusion gradient technique

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Embodiment 1

[0046] combined with figure 1 with figure 2 , a method for preparing an activated carbon adsorption membrane and a method for measuring bisphenols in wetland soil or sediments based on gradient diffusion film technology in this embodiment, the adsorption membrane is an agar film with small activated carbon particles distributed on the surface, wherein the activated carbon particles The particle size is <50 μm. The activated carbon adsorption membrane of this embodiment can adsorb bisphenols, and is especially suitable for the adsorption and analysis of bisphenols in wetland soil or sediment.

[0047] After professional theoretical analysis and repeated tests, the inventors concluded that when using DGT technology to effectively measure bisphenols in wetland soil or sediments, it is not only necessary to select a suitable adsorbent, but also to select a suitable diffusion membrane and filter. membrane and eluent. Existing studies have shown that carbon-based materials have e...

Embodiment 2

[0070] The preparation steps of diffusion membrane and adsorption membrane in the present embodiment are the same as embodiment 1, the difference is: the mass ratio of activated carbon powder and pure water in step (b) is 8:100; In the step (c), activated carbon solution and agar solution The volume ratio is 1:4; step (d) cooling time is 30min.

[0071] In this embodiment, a method for measuring bisphenols in wetland soil or sediment based on gradient diffusion film technology, its steps are the same as in Example 1, except that the measurement object in step (3) is organically polluted Wetland red soil, the basic properties of the soil are as follows: pH is 4.0, iron oxide content is 18520mg / kg (dry weight), dissolved organic matter is 75mg / kg (dry weight), and the maximum field water holding capacity is 52%. The standing time in the laterite is 30h; The eluent in the step (4) is 10mL methanol, and the elution efficiency of BPA, BPB and BPF are respectively 56%, 96% and 35%; ...

Embodiment 3

[0073] The preparation steps of the diffusion membrane and the adsorption membrane in this embodiment are the same as in Example 1, except that the mass ratio of activated carbon powder to pure water in step (b) is 5:100; activated carbon solution and agar solution in step (c) The volume ratio is 1.5:4; step (d) cooling time is 120min.

[0074] A kind of method in this embodiment is based on gradient diffusion thin film technology to measure bisphenols in wetland soil or sediment, its step is the same as embodiment 3, difference is: the time of filling high-purity nitrogen in step (2) is 8h; The measurement object in the step (3) is wet land sandy soil, and the pH of soil is 7.5, and the content of iron oxide is 5080mg / kg (dry weight), and dissolved organic matter is 45mg / kg (dry weight), and maximum field water holding capacity is 37%; the placement time of the DGT device in the wetland red soil is 36h; the eluent in step (4) is the mixed solution of 9mL methanol and 1mL 0.5m...

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Abstract

The invention discloses a preparation method of an activated carbon adsorption film and a method for measuring bisphenol substances in wetland soil or sediment based on a thin-film diffusion gradient technique, and belongs to the fields of environmental sciences and earth sciences. According to the preparation method of the activated carbon adsorption film, the activated carbon adsorption film is prepared by mixing activated carbon as an adsorbent with agar, and then is overlapped on an agar diffusion film and a PTFE filter film to form a DGT device; after nitrogen introduction pretreatment, the DGT device is put into the wetland soil or the sediment to be tested for 24 hours, and then the activated carbon adsorption film is taken out and eluted by use of an eluent which is the mixed solution of methanol and sodium hydroxide; next, the adsorbing capacity of the bisphenol compounds in the adsorption film is measured and the concentration of the bisphenol substances in the wetland soil or the sediment is calculated according to the Fick's first law of diffusion. The preparation method of the activated carbon adsorption film is simple in process, the adsorbent is even in distribution, the adsorbing capacity is high and the quality guarantee period is long; the DGT technique based on the adsorption film is simple and easy to operate and the testing result is representative, and therefore, the DGT technique is suitable for in-situ detection of the bisphenol substances in the wetland soil or the sediment.

Description

technical field [0001] The invention belongs to the fields of environmental science and earth science, and more specifically relates to a preparation method of activated carbon adsorption film and a method for measuring bisphenols in wetland soil or sediment based on gradient diffusion film technology. Background technique [0002] Bisphenols are widely used in the synthesis of polycarbonate plastics and resin linings for catering supplies, and have become common endocrine disruptors in our daily lives. Therefore, these bisphenols will inevitably enter the environment and widely exist in environmental media such as wetland soil or sediment. The reported concentrations of bisphenols, taking bisphenol A and bisphenol F in sediments as examples, are 0.01-0.15 mg / kg (dry weight) and 1.2-7.3 μg / kg (dry weight) respectively (Fromme H., et al ., Water Res. 2002, 36, 1429-1438). The existence of these bisphenols will cause certain harm to the ecosystem and human health. Long-term...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30G01N30/02
CPCB01J20/20G01N1/02B01J20/28033B01J20/281B01J2220/80B01J2220/54
Inventor 罗军管冬兴郑建伦潘岳周春羊房旭
Owner NANJING UNIV
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