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An adsorption membrane for selectively fixing tetravalent selenium and its preparation method

An adsorption membrane and selectivity technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as poor selectivity and cumbersome elution process

Active Publication Date: 2019-10-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problems of poor selectivity and cumbersome elution process of existing titanium dioxide adsorption membranes, and to provide an adsorption membrane for selectively immobilizing tetravalent selenium applied to gradient diffusion thin film technology and its preparation method

Method used

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  • An adsorption membrane for selectively fixing tetravalent selenium and its preparation method
  • An adsorption membrane for selectively fixing tetravalent selenium and its preparation method
  • An adsorption membrane for selectively fixing tetravalent selenium and its preparation method

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Embodiment 1

[0050] The inventor has concluded through theoretical analysis and repeated tests that if one wants to obtain an adsorption film with high selectivity and high adsorption capacity for tetravalent selenium, it is not only necessary to select a new adsorbent, but also to consider both the adsorbent and the initiator persulfuric acid. The ratio of ammonium solution and tetramethylethylenediamine, only when these aspects are comprehensively considered, can the adsorption membrane obtain the ideal adsorption effect. SBA-15 mesoporous silicon material is mainly used for the removal of heavy metals such as copper and lead in the environment. It has not been reported that it is used as a selective adsorption material for tetravalent selenium in the adsorption membrane of DGT technology. At the same time, the preparation of the adsorption membrane does not simply mix the modified SBA-15 mesoporous silicon material with the polyacrylamide solution to form a gel. It is necessary to consid...

Embodiment 2

[0064] An adsorption membrane for selectively immobilizing tetravalent selenium and a preparation method thereof in this embodiment are basically the same as in Example 1, except that in this embodiment, during the preparation of an adsorption membrane for selectively immobilizing tetravalent selenium:

[0065] In step 2, the acrylamide solution with a mass percent concentration of 40% purchased from the cross-linking agent DGT gel cross-linker, MQ water and General Electric Medical Group (GE Healthcare) produced by British DGT Research Co., Ltd. is 1:3.0 according to the volume ratio : The ratio of 2.3 is mixed to obtain a gel-making solution.

[0066] In step 3, the mercaptoamino double-modified SBA-15 mesoporous silicon material was mixed with the gel-making solution prepared in step 2 at a mass volume ratio of 1:15 to prepare a mixed solution.

[0067] In step 4, add ammonium persulfate solution with a mass percentage concentration of 10% to the mixed solution prepared in ...

Embodiment 3

[0078] An adsorption membrane for selectively immobilizing tetravalent selenium and a preparation method thereof in this embodiment are basically the same as in Example 1, except that in this embodiment, during the preparation of an adsorption membrane for selectively immobilizing tetravalent selenium:

[0079] In step 2, the acrylamide solution with a mass percent concentration of 40% purchased from the cross-linking agent DGT gel cross-linker, MQ water and General Electric Medical Group (GE Healthcare) produced by British DGT Research Co., Ltd. is 1:3.5 by volume : The ratio of 2.8 is mixed to obtain a gel-making solution.

[0080] In Step 3, the mercaptoamino double-modified SBA-15 mesoporous silicon material was mixed with the gel-making solution prepared in Step 2 at a mass volume ratio of 1:10 to prepare a mixed solution.

[0081] In step 4, add ammonium persulfate solution with a mass percentage concentration of 10% to the mixed solution prepared in step 3 according to ...

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Abstract

The invention discloses an adsorption film for selectively fixing tetravalent selenium and a preparation method thereof, and belongs to the technical field of a gradient diffusion film. The adsorptionfilm is a polyacrylamide gel film containing a mercapto-amino modified SBA-15 mesoporous silicon material uniformly distributed on the surface. The preparation method comprises the following steps ofpreparing the mercapto-amino modified SBA-15 mesoporous silicon material under acidic conditions; mixing a crosslinking agent, pure water and an acrylamide solution to obtain a polyacrylamide gel making solution; fully grinding the mercapto-amino modified SBA-15 mesoporous silicon material, evenly mixing with the gel making solution to obtain a gel making solution, and conducting ultrasound treatment; adding an ammonium persulfate solution and an N,N,N',N'-tetramethylethylenediamine solution to an obtained mixed solution, mixing evenly, slowly injecting the mixed solution into pores of two glass plates clamped with a U-shaped Teflon sheet for film formation, and soaking in pure water to prepare the adsorption film. The adsorption film has simple preparation process, good distribution uniformity and good selectivity to the tetravalent selenium.

Description

technical field [0001] The invention belongs to the technical field of gradient diffusion films, and more specifically relates to an adsorption film for selectively fixing tetravalent selenium and a preparation method thereof. Background technique [0002] As an essential part of the active site of glutathione peroxidase, selenium is one of the essential micronutrient elements for plants and animals, which can help humans effectively prevent cardiovascular diseases and delay cell aging. Studies have shown that there is very little difference between deficient and toxic doses of selenium. Selenium deficiency (<40μg / day) can lead to Keshan disease and Kaschin-Beck disease, while excessive selenium intake (>400μg / day) can also cause hair loss, nail loss and other human health diseases. Selenium in the environment mainly exists in the form of inorganic tetravalent selenium and hexavalent selenium, and the mobility and toxicity of different valence states of selenium are s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/10
Inventor 罗军史欣窈汤妮
Owner NANJING UNIV