Method for preparing bipolar membrane modified by heavy metal ion loaded carbon nao tube

A carbon nanotube modification, heavy metal ion technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as application limitations, poor dispersion, etc. High water dissociation efficiency

Inactive Publication Date: 2012-06-27
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite these advantages of carbon nanotubes, their applications are limited due to their poor dispersion in aqueous solutions

Method used

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  • Method for preparing bipolar membrane modified by heavy metal ion loaded carbon nao tube
  • Method for preparing bipolar membrane modified by heavy metal ion loaded carbon nao tube
  • Method for preparing bipolar membrane modified by heavy metal ion loaded carbon nao tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Loaded Fe for preparation 3+ Carbon nanotube modified anodic film layer of PVA - The specific steps of CMC-CNTs-Fe / CS bipolar membrane are as follows:

[0031] 1. Load Fe 3+ Preparation of CNT-modified Cation Exchange Membranes

[0032] Accurately weigh 100 grams of CMC, dissolve it in distilled water, and prepare a CMC aqueous solution with a mass fraction of 10%. Another PVA was taken, heated and stirred with distilled water to dissolve, added to the above-prepared CMC aqueous solution, stirred evenly, degassed under reduced pressure to obtain a viscous film liquid, the mass fraction ratio of PVA and CMC in the step was 1:1.

[0033] Put a certain amount of carbon nanotubes into concentrated nitric acid, heat and reflux for 6 hours, wash the carbon nanotubes after cooling, and then add 5% Fe(NO 3 ) 3 Add it into the ethanol suspension of carbon nanotubes uniformly dispersed by ultrasonic vibration, heat to 100° C. for evaporation with electromagnetic stirring, an...

Embodiment 2

[0042] Preparation of supported Ni 2+ CNT-modified cation-exchange membrane layer of PVA - The specific steps of SA-CNTs-Ni / CS bipolar membrane are as follows:

[0043] 1. Load Ni 2+ Preparation of CNT-modified Cation Exchange Membranes

[0044] Accurately weigh 80 grams of SA, dissolve it in distilled water, and prepare an 8% SA aqueous solution with a mass fraction. Separately take PVA (the mass fraction ratio of PVA to CMC is 1:1), heat and stir with distilled water to dissolve, add it to the SA aqueous solution prepared above, stir evenly, degas under reduced pressure, and obtain a viscous film liquid.

[0045] Put a certain amount of carbon nanotubes into concentrated nitric acid, heat and reflux for 6 hours, wash the carbon nanotubes after cooling, and then add Ni(NO 3 ) 2 Adding it into the ethanol suspension liquid of carbon nanotubes uniformly dispersed by ultrasonic vibration, heating with electromagnetic stirring to 100° C. for evaporation, and drying to obtain...

Embodiment 3

[0052] Supported Cu for preparation 2+ Carbon nanotube modified anodic film layer of PVA - The specific steps of CMC-CNTs-Cu / CS bipolar film are as follows:

[0053] 1. Load Cu 2+ Preparation of CNT-modified Cation Exchange Membrane

[0054] Accurately weigh 100 grams of CMC, dissolve it in distilled water, and prepare a CMC aqueous solution with a mass fraction of 10%. Take another PVA (the mass fraction ratio of PVA to CMC is 0.6:1), heat and stir with distilled water to dissolve, add it to the CMC aqueous solution prepared above, stir evenly, degas under reduced pressure, and obtain a viscous film liquid.

[0055] Put a certain amount of carbon nanotubes into concentrated nitric acid, heat and reflux for 12 hours, wash the carbon nanotubes after cooling, and then add 5% Cu(NO 3 ) 2 Add it into the ethanol suspension of carbon nanotubes uniformly dispersed by ultrasonic vibration, heat to 100° C. for evaporation with electromagnetic stirring, and dry to obtain the carbo...

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Abstract

The invention relates to a method for preparing a bipolar membrane modified by a heavy metal ion loaded carbon nao tube. According to the method, the heavy metal ion loaded carbon nao tube is added into a cation exchange membrane to modify the bipolar membrane. The method comprises the following steps of: 1) weighing the heavy metal ion loaded carbon nao tube, adding into absolute ethanol, and performing ultra-sonic oscillation to ensure that the carbon nano tube can be dispersed uniformly in the absolute ethanol; and 2) mixing the absolute ethanol containing the carbon nano tube and the prepared cation membrane solution, and preparing the bipolar membrane by a curtain coating or hot-pressing method. The bipolar membrane prepared by the method has the characteristics of high hydrolytic dissociation efficiency, low membrane impedance, low cell voltage, and high compatibility of two membrane layers, and the like.

Description

technical field [0001] The invention relates to a preparation method of a bipolar membrane, in particular to a preparation method of a carbon nanotube modified bipolar membrane loaded with heavy metal ions. Background technique [0002] A bipolar membrane (Bipolar Membrane, BPM) is composed of an anion exchange membrane and a cation exchange membrane. Under the action of a DC electric field, the water in the interface layer in the middle of the bipolar membrane will dissociate into H + and OH - , its theoretical voltage is 0.828V. Compared with ordinary electrolysis, bipolar membrane electrodialysis has many advantages, so it is widely used in food industry, chemical industry, life science, pollution control, resource recovery, separation and preparation of organic acids, etc. Therefore, bipolar membranes have become an extremely important branch of the membrane field. The water dissociation efficiency of the middle interface layer of the bipolar membrane directly affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22B01D71/08B01D67/00
Inventor 陈日耀周挺进陈晓郑曦陈震
Owner FUJIAN NORMAL UNIV
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