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A preparation method of high-purity birnessite-type manganese oxide that efficiently degrades organic dyes

A technology of pure birnessite and organic dyes, applied in chemical instruments and methods, water pollutants, manganese oxide/manganese hydroxide, etc., can solve time-consuming and labor-intensive problems, limit the practical application of birnessite, long reaction time, etc. problem, to achieve significant effect, time-saving and labor-saving large-scale production, and simple preparation process

Inactive Publication Date: 2018-04-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two methods require a long reaction time, or require post-treatment under high temperature conditions, which is time-consuming and labor-intensive; the birnessite prepared by the third method usually contains impurity phases
The shortcomings of the above methods have limited the practical application of birnessite

Method used

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  • A preparation method of high-purity birnessite-type manganese oxide that efficiently degrades organic dyes
  • A preparation method of high-purity birnessite-type manganese oxide that efficiently degrades organic dyes
  • A preparation method of high-purity birnessite-type manganese oxide that efficiently degrades organic dyes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, weigh 1.2g NaOH and dissolve in 50mL deionized water; secondly, accurately weigh 1.352g (8mmol) MnSO 4 ·H 2 O, 2.992g (8mmol) EDTA-Na was dissolved in 25ml of deionized water; under rapid stirring, NaOH solution was added dropwise to MnSO at 3mL / min 4 In the mixed solution with EDTA-Na, after the dropwise addition, continue to stir and age for 2 hours, filter and wash the precipitate several times, and then place it in a vacuum drying oven at 40°C for 12 hours to obtain high-purity birnessite.

[0030] Carry out XRD detection to the prepared sample, such as figure 1 Shown in (a), product is high-purity birnessite, and crystallinity is higher, figure 1 (b) Its FESEM map. Accurately weigh 10mg of the sample and add it to a 50ml 10mg / L RhB volumetric flask, ultrasonically disperse the sample in the solution for 5 minutes, and then use H 2 SO 4 Adjust the pH of the solution to 1, take 3 mL samples at 1, 3, 5 and 10 minutes, centrifuge to get the supernatant, mea...

Embodiment 2

[0032] First, weigh 2.4g NaOH and dissolve in 50mL deionized water; secondly, accurately weigh 1.352g (8mmol) MnSO 4 ·H 2 O, 2.992g (8mmol) EDTA-Na was dissolved in 25ml of deionized water; under rapid stirring, NaOH solution was added dropwise to MnSO at 6mL / min 4 In the mixed solution with EDTA-Na, after the dropwise addition, continue to stir and age for 2 hours, filter and wash the precipitate several times, and then place it in a vacuum drying oven at 40°C for 12 hours to obtain high-purity birnessite.

Embodiment 3

[0034] First, weigh 1.2g NaOH and dissolve in 50mL deionized water; secondly, accurately weigh 2.704g (16mmol) MnSO 4 ·H 2 O, 4.984g (16mmol) EDTA-Na was dissolved in 100ml deionized water; under rapid stirring, NaOH solution was added dropwise to MnSO at 6mL / min 4 In the mixed solution with EDTA-Na, after the dropwise addition, continue to stir and age for 2 hours, filter and wash the precipitate several times, and then place it in a vacuum drying oven at 80°C for 6 hours to obtain a high-purity birnessite sample.

[0035] Carry out XRD detection to the prepared sample, such as figure 2 Shown in (a), product is high-purity birnessite, and crystallinity is higher, figure 2 (b) Its FESEM map. Accurately weigh 10mg of the sample and add it to a 50ml 10mg / L MB (methylene blue) volumetric flask, ultrasonically disperse the sample in the solution for 5min, and then use H 2 SO 4 Adjust the pH of the solution to 1, take 3 mL samples at 1, 3, 5 and 10 minutes, centrifuge to get...

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Abstract

The present invention discloses a preparation method of high-purity birnessite capable of efficiently degrading organic dyes and having a three-dimensional micro-flower structure. According to the preparation method, a soluble manganese salt is adopted as a manganese source, a proper amount of a complexing agent is added to the manganese salt solution, and the high-purity birnessite having the three-dimensional micro-flower structure is obtained under an alkaline condition by using an air oxidation method. According to the present invention, the experiment results of the degradation of organic dyes such as methylene blue (MB), methyl orange (MO) and Rhodamine B (RhB) with the prepared birnessite show that the organic dyes can be efficiently degraded under the acidic condition in the absence of any oxidizing agents such as hydrogen peroxide and persulfate without any auxiliary equipment such as ultrasound, microwave and the like; the preparation method has characteristics of cheap and easily available raw material, simple preparation process, time saving, and labor saving; and the prepared product can degrade the organic dyes under the simple condition, can provide the significant effect, and can achieve the treatment on the industrial organic dye pollution.

Description

technical field [0001] The invention relates to a preparation method of high-purity birnessite-type manganese oxide capable of efficiently degrading organic dyes, and belongs to the technical field of material preparation. Background technique [0002] Birnessite is a two-dimensional layered manganese oxide with a unique crystal structure. Its sheets are composed of manganese-oxygen octahedrons sharing edges or corners, and the interlayers are composed of Na + Or other metal ions, and water molecules fill each other. Birnessite itself and its synthesized functional materials have a wide range of applications in light, electricity, magnetism, and catalysis. In recent years, the synthesis and application of birnessite has received extensive attention. [0003] At present, the synthesis of birnessite mainly contains the following several approaches: (1) adopting the sol-gel method, utilizing organic matter to reduce potassium permanganate; (2) under acidic conditions, hydroth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02C02F1/72C02F101/30
CPCC01G45/02C01P2002/72C01P2006/80C02F1/72C02F2101/308
Inventor 阳卫军秦明高赵昊良周元蓉李峰
Owner HUNAN UNIV
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