Adsorption film capable of selectively fixing hexavalent chromium ions and preparation method thereof

A hexavalent chromium ion, adsorption membrane technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of easy saturation, inability to selectively adsorb hexavalent chromium ions, Low capacity and other problems, to achieve the effect of not easy saturation, excellent selectivity, and improved adsorption capacity

Active Publication Date: 2015-11-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low adsorption capacity and easy saturation of hexavalent chromium ions by using the existing liquid adsorption membranes, and the defects that the existing solid adsorption membranes cannot selectively adsorb hexavalent chromium ions, and develop an application Solid-state adsorption film for highly selective adsorption of hexavalent chromium ions based on gradient diffusion film technology and preparation method thereof

Method used

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  • Adsorption film capable of selectively fixing hexavalent chromium ions and preparation method thereof
  • Adsorption film capable of selectively fixing hexavalent chromium ions and preparation method thereof
  • Adsorption film capable of selectively fixing hexavalent chromium ions and preparation method thereof

Examples

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Embodiment 1

[0035]An adsorption membrane for selectively fixing hexavalent chromium ions in this embodiment is a polyacrylamide hydrogel film uniformly distributed with N-methyl-D-glucosamine functionalized resin. The adsorption of chromium ions has high selectivity. Even in the water environment where the concentration of trivalent chromium ions is ten times that of hexavalent chromium ions, hexavalent chromium ions can be selectively adsorbed, and the adsorption amount of trivalent chromium ions is less than 5 %. Therefore, the adsorption membrane of this embodiment is suitable for the selective adsorption and analysis of hexavalent chromium ions in water environment media such as water body, soil interstitial water and sediment interstitial water.

[0036] A method for preparing an adsorption film for selectively fixing hexavalent chromium ions, the specific steps are:

[0037] Step 1. Preparation of N-methyl-D-glucosamine functionalized resin powder:

[0038] (1) Weigh 0.5g of chlor...

Embodiment 2

[0048] An adsorption film for selectively fixing hexavalent chromium ions and its preparation method in this embodiment are basically the same as in Example 1, the difference is that in this embodiment, in the process of preparing an adsorption film for selectively fixing hexavalent chromium ions:

[0049] In step 1, take chlorine ball 2g, according to 1 (mass): 5 (volume), the chlorine ball that size is 150 μ m is swelled 12h with dioxane; The reaction of synthesizing N-methyl-D-glucosamine functionalized resin The temperature is 60°C, and the reaction time is 6h; the reaction product is washed with pure water, 1mol / L sodium hydroxide, pure water, 1mol / L nitric acid and pure water in sequence, and repeated 3 times, and dried at 80°C to obtain the synthesized N-methylglucamine functionalized resin powder;

[0050] In step 2, the N-methyl-D-glucosamine functionalized resin powder prepared in step 1 and the acrylamide solution were mixed at a ratio of 1 (mass): 6.7 (volume) to o...

Embodiment 3

[0058] An adsorption film for selectively fixing hexavalent chromium ions and its preparation method in this embodiment are basically the same as in Example 1, the difference is that in this embodiment, during the preparation of the adsorption film for selectively fixing hexavalent chromium:

[0059] In step 1, 1.2 g of chlorine balls are weighed according to 1 (mass): 4 (volume) and dioxane is used to swell the chlorine balls with a size of 100 μm for 8 hours; the reaction of synthesizing N-methyl-D-glucosamine functionalized resin The temperature is 50°C and the reaction time is 10h.

[0060] In step 2, mix the N-methyl-D-glucosamine functionalized resin powder prepared in step 1 and the acrylamide solution at a ratio of 1 (mass): 5 (volume) to obtain a gel-making solution.

[0061] In step 3, add ammonium persulfate solution and tetramethyldiethylamine with a mass ratio of 10% to the gel-making solution prepared in step 2 according to 1 / 50 and 1 / 1000 of the volume of the ac...

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Abstract

The invention discloses an adsorption film capable of selectively fixing hexavalent chromium ions and a preparation method thereof, and belongs to the technical field of gradient diffusion thin films. The adsorption film adopts a polyacrylamide gel thin film containing N-methyl-D-glucamine functional resin particles; the preparation method comprises the following steps that 1, N-methyl-D-glucamine functional resin is synthesized; 2, the N-methyl-D-glucamine functional resin and acrylamide solutions are mixed according to the ratio of 1 (mass) to (3.3-6.7) (volume), 10% (mass ratio) sodium persulfate solutions accounting for 1 / 50-1 / 35 of the volume of acrylamide and tetramethyl diethylamine liquid accounting for 1 / 1250-1 / 665 of the volume of the acrylamide are added and stirred evenly, and then the mixture is injected into a gap between two glass plates between which a U-shaped plastic spacer sheet with the thickness of 0.25-0.5 mm is clamped at the rate of 5-15 mL / min to drive bubbles away, the glass plates are horizontally placed at 4-25 DEG C for 20-40 min to enable N-methyl-D-glucamine functional resin powder to be fully precipitated, then the temperature is increased to 45-60 DEG C to enable the solutions in between the glass plates to be jellied into a film, the film is steeped with pure water for 16-48 hours, and the adsorption film is prepared. The adsorption film has the high selectivity and the large adsorption capacity for the hexavalent chromium ions.

Description

technical field [0001] The invention relates to an adsorption film in the technical field of gradient diffusion films and a preparation method thereof, which is suitable for fixing and analyzing hexavalent chromium ions in environmental media, and in particular to an adsorption film for selectively fixing hexavalent chromium ions and a preparation method thereof. Background technique [0002] Chromium is the seventh largest element in the earth's crust and is widely used in industrial activities such as chromium salt production, electroplating processing, and leather manufacturing. The water pollution caused by the chromium-containing compounds discharged therefrom has become an increasingly serious global environmental problem. Chromium mainly forms hexavalent chromium ion (Cr 2 o 7 2- 、HCrO 4 - or CrO 4 2- ) and trivalent chromium ions (Cr 3+ ) form, in which trivalent chromium ions are micronutrients needed by the human body, while hexavalent chromium ions are like...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/291B01J20/30C02F1/28C02F101/22
Inventor 罗军潘岳管冬兴
Owner NANJING UNIV
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