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Method for fixing layered double hydroxide on surface of polypropylene and application of method

A hydroxide, surface fixation technology, applied in chemical instruments and methods, other chemical processes, preparation of test samples, etc., can solve the problems of poor continuity, uneven thin layer, complex preparation methods, etc., and achieve dense and stable structure. Effect

Active Publication Date: 2015-12-16
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main immobilization methods of layered double hydroxide thin layers mainly include solvothermal method, colloidal deposition method, electrostatic adsorption method and in-situ growth method, etc., but these methods have the problems of inhomogeneity, poor continuity or The disadvantage of complex preparation method is not suitable for the immobilization modification of layered double hydroxide on the surface of polypropylene plastic centrifuge tube with strong chemical inertness and smooth surface, and cannot realize the adsorption and removal of pollutants in water

Method used

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  • Method for fixing layered double hydroxide on surface of polypropylene and application of method
  • Method for fixing layered double hydroxide on surface of polypropylene and application of method
  • Method for fixing layered double hydroxide on surface of polypropylene and application of method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Weigh 20 mg of dopamine, dissolve it in 10 mM (10 mL) Tris-HCl buffer solution, adjust the pH to 8.5, shake the solution until the solution is light brown, and obtain a pre-oxidized dopamine alkaline solution.

[0027] (2) Add 1.0 mL of pre-oxidized dopamine alkaline solution into a 1.5 mL polypropylene centrifuge tube, heat at 30°C for 6 h, wash with water and methanol in turn, dry in an oven, and repeat the reaction once to obtain A polypropylene centrifuge tube with a polydopamine layer on the inner wall.

[0028] (3) 0.029gNi(NO 3 ) 2 ·6H 2 O, 0.019gAl(NO 3 ) 3 9H 2 O and 0.021gCO(NH 2 ) 2 Add 10mL of water, mix well, take 1mL into a polypropylene centrifuge tube with a polydopamine layer modified on the inner wall, cover the centrifuge tube and seal it, heat it in a water bath at 90°C for 20h, take it out, unseal, wash, and dry to obtain the inner wall Polypropylene centrifuge tubes decorated with thin layers of polydopamine and Ni-Al layered double hyd...

Embodiment 2

[0032] (1) Weigh 20 mg of dopamine, dissolve it in 10 mM (10 mL) Tris-HCl buffer solution, adjust the pH to 8.5, shake the solution until the solution is light brown, and obtain a pre-oxidized dopamine alkaline solution.

[0033] (2) Add 1.0 mL of pre-oxidized dopamine alkaline solution into a 1.5 mL polypropylene centrifuge tube, heat at 50°C for 6 h, wash with water and methanol in turn, dry in an oven, and repeat the reaction once to obtain A polypropylene centrifuge tube with a polydopamine layer on the inner wall.

[0034] (3) 0.029gNi(NO 3 ) 2 ·6H 2 O, 0.019gAl(NO 3 ) 3 9H 2 O and 0.026gCO(NH 2 ) 2Add 10mL of pure water, mix well, take 1mL into a polypropylene centrifuge tube with a polydopamine layer modified on the inner wall, cover the centrifuge tube and seal it, heat it in a water bath at 94°C for 21h, take it out, unseal it, wash it, and dry it. A polypropylene centrifuge tube whose inner wall was modified with polydopamine and Ni-Al layered double hydroxid...

Embodiment 3

[0036] (1) Weigh 20 mg of dopamine, dissolve it in 10 mM (10 mL) Tris-HCl buffer solution, adjust the pH to 8.5, shake the solution until the solution is light brown, and obtain a pre-oxidized dopamine alkaline solution.

[0037] (2) Add 1.0 mL of pre-oxidized dopamine alkaline solution into a 1.5 mL polypropylene centrifuge tube, heat at 40°C for 6 h, wash with water and methanol in sequence, dry in an oven, and repeat the reaction once to obtain A polypropylene centrifuge tube with a polydopamine layer on the inner wall.

[0038] (3) 0.029gNi(NO 3 ) 2 ·6H 2 O, 0.019gAl(NO 3 ) 3 9H 2 O and 0.026gCO(NH 2 ) 2 Add 10 mL of pure water, mix well, take 1 mL into a polypropylene centrifuge tube with a polydopamine layer modified on the inner wall, cover the centrifuge tube and seal it, heat it in a water bath at 98°C for 24 hours, take it out, unseal it, wash it, and dry it. A polypropylene centrifuge tube whose inner wall was modified with polydopamine and Ni-Al layered dou...

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Abstract

The invention discloses a method for fixing layered double hydroxide on the surface of polypropylene and application of the method. Firstly, a dopamine alkaline solution is prepared in a polypropylene centrifugal pipe, vortex preoxidation is carried out at normal temperature, a reaction is conducted for 6-8 hours at the water bath condition of 30-50 DEG C, and a poly-dopamine thin layer is formed; then, divalent metal ions, trivalent metal ions and a CO(NH2)2 solution are added into the centrifugal pipe modified by dopamine, layered double hydroxide is prepared and fixed after a heating reaction, and the inner surface of a device is provided with a layer-by-layer assembled structure of polydopamine and the layered double hydroxide. The preparation method is simple, no pollutant reagent needs to be added, and the formed layered double hydroxide structure is stable and compact. The device has a good effect on removing flurbiprofen, other acidic medicine active compounds, rhodamine B and other anionic dye in aqueous solutions. The device is small in size and convenient to carry, and can achieve the functions of adsorbing and removing anionic compounds in solutions through simple centrifugation.

Description

technical field [0001] The invention relates to a method for fixing layered double hydroxide on the surface of polypropylene and its application, which is applied to the removal of pollutants in a small amount of solution samples to be treated in laboratories. Background technique [0002] Layered double hydroxide is a naturally occurring or artificially synthesized layered structure compound composed of two or more metal cations with positively charged main layers, and an anion structure that can be exchanged between the layers. Its structural formula is [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A n- ) x / n mH 2 O, where M 2+ and M 3+ represent divalent and trivalent metal cations, respectively, A n- Represents interlayer anions. Because of its special properties such as the exchangeability of interlayer anions, the changeability of layer cations, memory effect and large surface area, it has broad application prospects in the fields of adsorption, catalysis, electrochemistry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30G01N1/34
Inventor 陈子林张文鹏周韦
Owner WUHAN UNIV
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