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Fixed film for synchronously enriching phosphorus and sulphur and manufacturing method for fixed film

A production method and technology for fixing membranes, which are applied in chemical instruments and methods, preparation of samples for testing, and other chemical processes, etc., can solve the problems of low analysis and measurement efficiency, inability to absorb simultaneously, and single absorption function, etc., and achieve the optimization of the production process. , the distribution density is reasonable, the effect of matching is reasonable

Inactive Publication Date: 2012-10-03
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Diffusive gradients in thin films (DGT) is a non-destructive, in-situ technique to obtain the distribution and activity of pollutants in sediments, which can enrich and determine the active phosphorus or sulfur in sediments by using fixed films, but At present, the fixed membranes used in DGT determination are all fixed membranes with a single absorption function, that is, they can only absorb phosphorus or sulfur, and cannot absorb and enrich phosphorus and sulfur simultaneously, resulting in low analysis and determination efficiency and high operating costs.

Method used

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  • Fixed film for synchronously enriching phosphorus and sulphur and manufacturing method for fixed film
  • Fixed film for synchronously enriching phosphorus and sulphur and manufacturing method for fixed film
  • Fixed film for synchronously enriching phosphorus and sulphur and manufacturing method for fixed film

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A fixed membrane for simultaneous enrichment of phosphorus and sulfur, the preparation method of which is as follows:

[0032] Use 25% ammonia water to adjust the pH of the 0.1M zirconium oxychloride aqueous solution to reach and stabilize at 7.0±0.2. The resulting precipitate is washed with deionized water until there is no chloride ion. After the precipitate is centrifuged to remove the supernatant, it is dried with a hair dryer to its The water content is 50%, and then it is ground into powder with a mortar to obtain hydrated zirconium hydroxide powder with a water content of 50%.

[0033]Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 50%, 0.3g of silver iodide particles and 4mL of 30% polyacrylamide solution, grind and ultrasonically disperse to obtain a film solution, and let it stand for 10 minutes to remove precipitation. Then add 3 μL TEMED and 75 μL 10% (wt) ammonium persulfate to the supernatant after removing the precipitate, mix qui...

Embodiment 2

[0038] A fixed membrane for simultaneous enrichment of phosphorus and sulfur, the preparation method of which is as follows:

[0039] Hydrated zirconium hydroxide powder with a moisture content of 45% was prepared according to the method of Example 1.

[0040] Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 45%, 0.2g of silver iodide particles and 3mL of 30% polyacrylamide solution evenly, grind and ultrasonically disperse to obtain a film solution, and let it stand for 10 minutes to remove precipitation. Then add 4 μL TEMED and 100 μL 10% (wt) ammonium persulfate to the supernatant after removing the precipitate, mix quickly and slowly pour it into two glass plates with U-shaped plastic sheets of 0.4 mm and uniform thickness In the gap of the formed mold; after the air bubbles are driven out, the glass plate is placed horizontally at a low temperature of 4 °C for half an hour, so that the hydrated zirconium hydroxide and silver iodide particles can fr...

Embodiment 3

[0044] A fixed membrane for simultaneous enrichment of phosphorus and sulfur, the preparation method of which is as follows:

[0045] Hydrated zirconium hydroxide powder with a moisture content of 55% was prepared according to the method of Example 1.

[0046] Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 55%, 0.4g of silver iodide particles and 5mL of 30% polyacrylamide solution evenly, grind and ultrasonically disperse to obtain a film solution, and let it stand for 10 minutes to remove precipitation. Then add 2 μL TEMED and 50 μL 10% (wt) ammonium persulfate to the supernatant after removing the precipitate, mix quickly and slowly pour it into two glass plates sandwiched by U-shaped plastic sheets of 0.4 mm and uniform thickness In the gap of the formed mold; after the air bubbles are exhausted, the glass plate is placed horizontally at a low temperature of 2°C for half an hour, so that the hydrated zirconium hydroxide and silver iodide particles ...

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Abstract

The invention discloses a fixed film for synchronously enriching phosphorus and sulphur. The fixed film is a gel film manufactured after film liquid is gelatinized and is formed after grinding and ultrasonication are performed on a liquid mixture containing zirconium hydroxide hydrate powder, silver iodide particles and polyacrylamide. The manufacturing method for the fixed film comprises the following steps of: mixing the zirconium hydroxide hydrate powder and the silver iodide particles with polyacrylamide aqueous solution to obtain the liquid mixture; performing the grinding and the ultrasonication on the liquid mixture to prepare the even film liquid; adding a good amount of tetramethylethylenediamine and ammonium persulfate; then, injecting the film liquid into a glass mold; horizontally laying up the glass mold at the low temperature of 2-4 DEG C to enable zirconium hydroxide and the silver iodide particles to freely settle; and then, heating to 15+ / -1 DEG C and laying up the glass mold until the film liquid is gelatinized into the film. According to the fixed film disclosed by the invention, the phosphorus and the sulphur can be synchronously enriched; the enrichment content is high; the particle size on the surface of the film is small (not greater than 5mum) and is even in distribution; and high-resolution synchronous analysis can be performed on deposits: the phosphorus and the sulphur.

Description

technical field [0001] The present invention relates to a fixed film in the thin film diffusion gradient technology (Diffusive gradients in thin films, DGT) and its preparation method, which is suitable for the enrichment and analysis of phosphorus and sulfur in the environmental medium, especially relates to a kind of synchronous Immobilized membrane enriched with phosphorus and sulfur and method for making same. Background technique [0002] Both phosphorus and sulfur are important biogenic elements in the aquatic environment. Phosphorus is the most critical limiting element that causes eutrophication in water bodies. The increase in phosphorus content in water bodies is the primary cause of excessive growth of cyanobacteria and the formation of algal blooms; sulfur can form odorous gases such as hydrogen sulfide in a reducing environment, causing water body pollution. At the same time, the reduced sulfur and iron in the sediment can form a precipitate, which promotes the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30G01N1/40
Inventor 丁士明许笛贾飞
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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