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Immobilized membrane for synchronously enriching phosphor and ferrum and preparation method thereof

A production method and technology for fixing membranes, applied in chemical instruments and methods, preparation of samples for testing, and other chemical processes, etc., can solve problems such as failure to achieve simultaneous fixation and mutual interference, and achieve stable shape and high enrichment capacity. , the effect of production process optimization

Inactive Publication Date: 2014-09-17
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the fixing principle of the above-mentioned fixatives to phosphorus or iron ions is adsorption, and the adsorption objects are anions and cations respectively, when they are superimposed for the production of phosphorus-iron synchronous immobilization film, mutual interference may occur, and synchronous immobilization cannot be achieved. Effect

Method used

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  • Immobilized membrane for synchronously enriching phosphor and ferrum and preparation method thereof
  • Immobilized membrane for synchronously enriching phosphor and ferrum and preparation method thereof
  • Immobilized membrane for synchronously enriching phosphor and ferrum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A fixed membrane for simultaneously enriching phosphorus and iron, the preparation method of which is as follows:

[0030] 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 moisture content is 50±5%, and then ground into powder with a mortar to obtain hydrated zirconium hydroxide powder with a moisture content of 50±5%.

[0031] Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 50±5% and 5mL of 30% polyacrylamide aqueous solution in a mortar, grind for 10min, transfer to a 10ml centrifuge tube, add 1g of Chelex-100 cation exchange resin and mix evenly to obtain the product Then add 16 μL of 10% (wt) ammonium persulfate and 8 μL TEMED to the film-forming solution, mix quickly and slow...

Embodiment 2

[0035] A fixed membrane for simultaneously enriching phosphorus and iron, the preparation method of which is as follows:

[0036] Hydrated zirconium hydroxide powder with a moisture content of 50 ± 5% was prepared according to the method of Example 1.

[0037] Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 50±5% and 5mL of 30% polyacrylamide aqueous solution in a mortar, grind for 10min, transfer to a 10ml centrifuge tube, add 0.8g of Chelex-100 cation exchange resin and mix evenly to obtain Film-forming solution, then add 16 μL 10% (wt) ammonium persulfate and 8 μL TEMED to the film-forming solution, mix quickly and slowly pour it into two glass plates sandwiched by U-shaped plastic sheets of 0.4mm 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 2-4 °C for half an hour, so that the hydrated zirconium hydroxide and Chelex-100 particles can settle f...

Embodiment 3

[0040] A fixed membrane for simultaneously enriching phosphorus and iron, the preparation method of which is as follows:

[0041] Hydrated zirconium hydroxide powder with a moisture content of 55% was prepared according to the method of Example 1.

[0042] Mix 1g of hydrated zirconium hydroxide powder with a moisture content of 50±5% and 5mL of 30% polyacrylamide aqueous solution in a mortar, grind for 10min, transfer to a 10ml centrifuge tube, add 0.6g of Chelex-100 cation exchange resin and mix evenly to obtain Film-forming solution, then add 16 μL 10% (wt) ammonium persulfate and 8 μL TEMED to the film-forming solution, mix quickly and slowly pour it into two glass plates sandwiched by U-shaped plastic sheets of 0.4mm 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 2-4 °C for half an hour, so that the hydrated zirconium hydroxide and Chelex-100 particles can settle freel...

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Abstract

Provided is an immobilized membrane for synchronously enriching phosphor and ferrum. The immobilized membrane is a gel film which is prepared from a film-forming liquid in a gelling manner, wherein the film-forming liquid comprises zirconium hydroxide hydrate, Chelex-100 cation exchange resin and polyacrylamide. A preparation method of the immobilized membrane includes following steps: fully a mixing zirconium hydroxide hydrate powder, the Chelex-100 cation exchange resin and a polyacrylamide aqueous solution together to obtain a uniform membrane liquid, adding an appropriate amount of Tetramethylethylenediamine and ammonium persulfate, filling a glass mould with the membrane liquid, placing the glass mould horizontally at a low temperature of 2-4 DEG C for enabling zirconium hydroxide hydrate and Chelex to be freely precipitated, performing a heating process to 45+ / -5 DEG C and laying the glass mould up until the membrane liquid gels into a membrane. The immobilized membrane can synchronously enrich phosphor and ferrous ions with a high enriching capacity and can be used for a high resolution synchronous analysis of the phosphor and the ferrous ions in an environmental sample.

Description

technical field [0001] The present invention relates to a fixed film in 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 iron in environmental media, especially relates to a simultaneous enrichment in environmental analysis A fixed film for collecting phosphorus and iron and a method for making the same. Background technique [0002] Both phosphorus and iron are important biogenic elements in the aquatic environment. Phosphorus is a key limiting element that causes eutrophication in water bodies. The increase of phosphorus content in water bodies is the main reason for the excessive growth of cyanobacteria and the formation of algal blooms. Iron-bound phosphorus is one of the main forms of phosphorus in sediments and flooded soils. The phosphorus is adsorbed on the surface of (hydr) iron oxide. When the iron oxide is reduced to ferrous iron under ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/58G01N1/40
Inventor 丁士明许笛
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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