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Preparation method and application of azo dye adsorbent

A technology of azo dyes and adsorbents, applied in the field of environmental engineering, to achieve the effects of non-toxic materials, convenient preparation, and simple ingredients

Inactive Publication Date: 2012-02-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the chemical modification of graphite oxide by polyacetimide to prepare water-dispersible graphite oxide and its application in azo dye adsorption has not been reported.

Method used

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  • Preparation method and application of azo dye adsorbent
  • Preparation method and application of azo dye adsorbent
  • Preparation method and application of azo dye adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 5g K 2 S 2 o 8 and 5g P 2 o 5 Add it into 20mL of concentrated sulfuric acid, after it is fully dissolved, heat up to 80°C, then add 5g of graphite powder, stop heating after 4 hours of magnetic stirring, and naturally cool to room temperature 15°C; Dilute the obtained product to 5% of the original volume with distilled water times, centrifuge (2000r / min) to collect the precipitate, and wash with distilled water 3 times to obtain pre-oxidized graphite;

[0038] The obtained pre-oxidized graphite was dispersed in 40mL of concentrated sulfuric acid with a mass fraction of 70%, cooled to 0°C in an ice-salt bath, and 10g of KMnO 4 Add it to the pre-oxidized graphite dispersion, react for 1 hour, then add 1120mL distilled water and 20mL hydrogen peroxide, centrifuge (500r / min) to remove impurities, continue to centrifuge the supernatant (4000r / min), collect the precipitate, and obtain graphite oxide (GO).

Embodiment 2

[0040] 10g K 2 S 2 o 8 and 10g P 2 o 5Add it into 30mL of concentrated sulfuric acid, after it is fully dissolved, heat up to 60°C, then add 10g of graphite powder, stop heating after 6 hours of magnetic stirring, and naturally cool the room temperature to 35°C; Dilute the obtained product to 3% of the original volume with distilled water times, centrifuge (4000r / min) to collect the precipitate, and wash with distilled water 4 times to obtain pre-oxidized graphite;

[0041] The obtained pre-oxidized graphite was dispersed in 80mL of concentrated sulfuric acid with a mass fraction of 98%, cooled to -5°C in an ice-salt bath, and 40g KMnO 4 Add to the pre-oxidized graphite dispersion, react for 2 hours, then add a certain amount of 2240mL distilled water and 40mL hydrogen peroxide, centrifuge (500r / min) to remove impurities, and continue to centrifuge the supernatant (6000r / min), collect the precipitate, Graphite oxide A was obtained.

Embodiment 3

[0043] 10g K 2 S 2 o 8 and 10g P 2 o 5 Add it into 40mL of concentrated sulfuric acid, after it is fully dissolved, heat up to 90°C, then add 5g of graphite powder, stop heating after 8 hours of magnetic stirring, and naturally cool to room temperature 25°C; Dilute the obtained product to 10% of the original volume with distilled water times, centrifuged (3000r / min) to collect the precipitate, and washed 5 times with distilled water to obtain pre-oxidized graphite;

[0044] The obtained pre-oxidized graphite was dispersed in 40mL of concentrated sulfuric acid with a mass fraction of 85%, cooled to 0°C in an ice-salt bath, and 40g KMnO 4 Add to the pre-oxidized graphite dispersion, react for 3 hours, then add 2240mL distilled water and 40mL hydrogen peroxide, centrifuge (500r / min) to remove impurities, continue to centrifuge the supernatant (6000r / min), collect the precipitate, and obtain graphite oxide .

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Abstract

The invention discloses a preparation method and application of an azo dye adsorbent, which comprises following operating steps: first, pretreatment of graphite is carried out to obtain oxidation graphite capable of adsorbing azo dye through pi-pi interaction; and then polymine is used for chemical modification of the oxidation graphite, so that the oxidation graphite has good dispersion stability in aqueous solution. Modified oxidation graphite is used for waste water treatment containing azo dye. The preparation method and the application of the azo dye adsorbent is convenient in preparation, fast in absorption, high in efficient, wide in application scope, free of residues and adverse reactions and the like, and is expected to be widely used in the field of environmental engineering.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to an azo dye adsorbent and its preparation method and application. Background technique [0002] Azo dyes are currently the most widely used dyes in the printing and dyeing industry. They have stable chemical properties. Their wastewater has the characteristics of deep color, difficult treatment, high toxicity of degradation products and great environmental hazards. It is a typical type of printing and dyeing wastewater. At present, the methods commonly used to treat azo dye wastewater mainly include adsorption method, chemical oxidation method, biochemical method, etc. Among them, the adsorption method has become the most widely studied and used because of its relatively low cost, avoiding secondary pollution and non-toxic side effects. a method of The key to the implementation of this technology lies in the selection of high-performance adsorbents. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D15/00
Inventor 马栋陈宇云张黎明陈弟虎
Owner SUN YAT SEN UNIV
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