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Mg(OH)2-based phosphorus binding film as well as preparation and application thereof

A technology that combines membranes and tetramethylethylenediamine, which is applied in the preparation of test samples, surface/boundary effects, and measurement devices, and can solve the problems that cannot meet the requirements of phosphorus determination and analysis, large particles of surface fixatives, and complicated preparation processes and other problems, to achieve the effects of shortening the film forming time, high selectivity, and simple preparation process

Active Publication Date: 2015-04-29
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the in-situ enrichment of phosphorus by thin-film diffusion gradient technology. The main technologies are: (1) One is to use ferrihydroxide (Ferrihydrite) as the phosphorus fixative to prepare the corresponding DGT binding membrane, which is currently commercialized. material, but the binding membrane is easily deformed, and the adsorption capacity is very low, the application is limited, and it cannot meet the requirements of the determination and analysis of phosphorus in high-saline seawater
(2) A DGT binding membrane (Environ.Sci.Technol.2010,

Method used

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  • Mg(OH)2-based phosphorus binding film as well as preparation and application thereof
  • Mg(OH)2-based phosphorus binding film as well as preparation and application thereof
  • Mg(OH)2-based phosphorus binding film as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Mix the MgO and acrylamide prepolymerization solution according to the mass volume ratio of 1:1.1, and add the same volume of deionized water as the acrylamide prepolymerization solution. The acrylamide prepolymerization solution consists of 15% acrylamide and 0.3% It is prepared from a mixed aqueous solution of N,N'-methylenebisacrylamide; (2) add 30 μL of 10% ammonium persulfate solution and 4 μL of tetramethylethylenediamine to the above solution, and stir well; (3) mix Slowly inject the above solution into the gap between two glass plates sandwiched with a U-shaped plastic sheet, drive out the air bubbles, place the glass plate in an oven at 30±2°C for 10 minutes, and cool it to room temperature naturally; (4) Put the glass plate in Soak in deionized water at 25±0.5°C for 2 hours to fully hydrate magnesium oxide to form magnesium hydroxide. figure 2 It can be seen that MgO is completely hydrated to form Mg(OH) 2 . Remove the mold and take out the Mg(OH) 2 Ph...

Embodiment 2

[0035](1) Mix the MgO and acrylamide prepolymerization solution according to the mass volume ratio of 1:2.2, and add the same volume of deionized water as the acrylamide prepolymerization solution. The acrylamide prepolymerization solution consists of 28.6% acrylamide and 1.5% It is prepared from a mixed aqueous solution of N,N'-methylenebisacrylamide; (2) Add 200 μL of 10% ammonium persulfate solution and 25 μL of tetramethylethylenediamine to the above solution, stir well, and the above ammonium persulfate Potassium persulfate can also be used instead. (3) Slowly inject the above solution into the gap between two glass plates sandwiched with a U-shaped plastic sheet, drive out the air bubbles, place the glass plate in an oven at 46±2°C for 30 minutes, and cool it to room temperature naturally; (4) Soak the glass plate in deionized water at 30±0.5°C for 5 hours to fully hydrate the magnesium oxide to form magnesium hydroxide. Remove the mold and take out the Mg(OH) 2 Phosph...

Embodiment 3

[0037] (1) Mix MgO and acrylamide prepolymerization solution at a mass volume ratio of 1:1.165, and add the same volume of deionized water as the acrylamide prepolymerization solution. The acrylamide prepolymerization solution consists of 21.8% acrylamide and 0.9% (2) Add 115 μL of 10% potassium persulfate solution and 14.5 μL of tetramethylethylenediamine to the above solution, stir well, and the above Ammonium sulfate can also be replaced by potassium persulfate. (3) Slowly inject the above solution into the gap between two glass plates sandwiched with a U-shaped plastic sheet, drive out the air bubbles, place the glass plate in an oven at 38±2°C for 20 minutes, and cool it to room temperature naturally; (4) Soak the glass plate in deionized water at 27.5±0.5°C for 3.5 hours to fully hydrate the magnesium oxide to form magnesium hydroxide, remove the mold and take out the Mg(OH) 2 Phosphorus-based binding membranes, cut into desired shapes, and soaked in deionized water for...

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Abstract

The invention relates to an Mg(OH)2-based phosphorus binding film as well as a preparation and an application thereof. With MgO powder as a binding agent, the MgO powder and water in a prepolymerization solution can react for in-situ hydration in an MgO polymerization process to form Mg(OH)2, so that the concentration of the prepolymerization solution is increased and the film-forming time is shortened; the Mg(OH)2-based phosphorus binding film is simple in preparation process and has the advantages of high film-forming rate, high mechanical strength, difficult deformation and uniform distribution of a phosphorus fixing agent in the film; meanwhile, the prepared Mg(OH)2-based phosphorus binding film can enrich low-concentration phosphorus in a water body, especially low-concentration phosphorus in seawater; compared with a commercial ferrihydrite-DGT (diffusive gradient in thin film) in-situ enrichment device, an Mg(OH)2-DGT in-situ enrichment device assembled by the Mg(OH)2-based phosphorus binding film is relatively high in capture capability on nanomole phosphorus in different water bodies, relatively accurate in determination result and relatively high in selectivity.

Description

technical field [0001] The invention relates to the preparation and application of DGT binding membranes for in-situ high-resolution analysis and evaluation of pollutants and nutrients in environmental media such as natural water, soil, and sediment, and in particular to a Mg(OH) 2 Phosphorus-bound membranes and their preparation and application. Background technique [0002] At present, the routine determination method of phosphate in water is mainly the phosphoromolybdenum blue colorimetric method, and the detection limit of this method is 0.03-28 μmol / L. It can meet the needs of the determination of active inorganic phosphorus in general fresh water and offshore water, but it cannot be applied to the determination of low-concentration phosphorus in drinking water with extremely low phosphorus content, oligotrophic clean fresh water, and ocean water. Moreover, the traditional sampling method will destroy the physical, chemical and biological environment around the samplin...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N1/34
Inventor 谢发之胡婷婷李海斌圣丹丹汪雪春肖胜保
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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