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Synthetic method and application of polyacrylic acid-packaged nano-tricobalt tetraoxide

A technology of tricobalt tetroxide and polyacrylic acid, which is applied in chemical instruments and methods, water treatment of special compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of difficult realization of practical value, unfavorable large-scale promotion, and low catalytic activity etc. to achieve the effects of low power consumption, fast degradation rate, and large specific surface area

Active Publication Date: 2017-08-15
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of polyacrylic acid wrapped nano cobalt tetroxide (PAA-Co) with good water solubility and good dispersibility 3 o 4 ) synthesis method and its use in the degradation of organic dyes to overcome the existing nano-Co 3 o 4 The preparation is complicated, time-consuming and energy-consuming, the catalytic activity is low, it is difficult to realize the real practical value, and it is not conducive to large-scale promotion and other shortcomings

Method used

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  • Synthetic method and application of polyacrylic acid-packaged nano-tricobalt tetraoxide
  • Synthetic method and application of polyacrylic acid-packaged nano-tricobalt tetraoxide

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Effect test

Embodiment 1

[0036] will contain 1 M CoCl 2 •6H 2 A solution of O (2.17 g in 5.0 mL of water) was mixed with 10 mL of PAA solution (0.05 M). With continuous stirring, the mixture was added to 30 mL of ammonia solution. The mixture was stirred continuously for another 24 hours, during which time the color of the solution changed from purple to dark brown, which indicated the formation of PAA-Co 3 o 4 . The product was then centrifuged at 4000 rpm for 30 minutes to remove large agglomerates and debris, and the supernatant was purified and concentrated using a 30K ultrafiltration centrifuge tube. Finally, the resulting solution was freeze-dried to obtain a brown solid powder.

Embodiment 2

[0038] PAA-Co 3 o 4 (1 mg / mL) and MB solution (30 mg / L), then add H 2 o 2 (1 M), the temperature is controlled at 60 degrees Celsius, and the absorbance change of the solution is recorded with a UV-visible spectrophotometer, such as figure 2 (A) and figure 2 (B) shown. As the reaction proceeded, the dye had been substantially completely degraded within 15 minutes.

Embodiment 3

[0040] PAA-Co 3 o 4 (1 mg / mL) and MB solution (30 mg / L), then adjust the pH of the solution to 4.51, 5.38, 6.17, 7.32, 8.24, 9.64, 10.2, 11.28, 12.25 with sodium hydroxide and hydrochloric acid, and control the temperature is 60 degrees Celsius, and finally add H to these 9 solutions 2 o 2 (1 M), after 20 minutes the dye degradation rate was calculated as figure 2 (C) shown.

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Abstract

The invention discloses a synthetic method and application of polyacrylic acid-packaged nano-tricobalt tetraoxide. The synthetic method comprises the following steps: dissolving cobalt nitrate into water, so as to form a 1M-10M solution; dissolving polyacrylic acid into water, so as to form a 0.05M-0.5M solution; mixing the two solutions, adding the mixed solution into ammonia water at a continuous stirring state so as to react; continuously stirring a mixture for 24 hours so as to change the color from wine red to deep brown, and centrifuging a product at a speed of 400rpm for 30 minutes, so as to remove big agglomerates and fragments; purifying supernate, and concentrating by virtue of a 30K ultrafiltration centrifugation tube; and finally, carrying out freeze drying on the obtained solution, so as to obtain light brown solid powder, namely polyacrylic acid-packaged nano-tricobalt tetraoxide. Compared with the prior art, the synthetic method has the advantages that polyacrylic acid-packaged nano-tricobalt tetraoxide is synthesized by virtue of a one-step method, the step is simple, the cost is relatively low, and particles size of the synthesized product is relatively small; and polyacrylic acid-packaged nano-tricobalt tetraoxide is applied to the degradation of organic dyes due to high catalytic activity.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation and application, in particular to a novel polyacrylic acid-wrapped nano cobalt tetroxide (PAA-Co 3 o 4 ) preparation of nanocatalysts and their application in the degradation of organic dyes. Background technique [0002] There are many kinds of organic dyes, which bring colorfulness to people's life, but also produce a large amount of dye wastewater discharged into the environment, resulting in the pollution of natural water bodies. The main hazards are as follows: [0003] ①The dyes in the wastewater can absorb light, reduce the transparency of the water body, consume a large amount of oxygen in the water, cause the water body to lack oxygen, seriously affect the growth of aquatic organisms and microorganisms, and destroy the self-purification of the water body; [0004] ②Dyes are aromatic halides, aromatic nitro compounds, aromatic amine compounds, etc., which are formed after th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/02B01J35/10B01J37/03C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J23/75B01J37/038C02F2101/38C02F2101/36C02F2101/308C02F2305/10B01J35/393B01J35/23B01J35/40B01J35/50B01J35/60
Inventor 周天舒张世翔王琦贤张闽施国跃
Owner EAST CHINA NORMAL UNIV
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