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Persulfate compound activator and its preparation method and application

A composite activator, persulfate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. The problems such as low rate and severe operating conditions can improve the activation effect, strong activation performance and large specific surface area.

Active Publication Date: 2020-05-19
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat-activated persulfate technology consumes a lot of energy, light-activated persulfate technology is harsh on operating conditions, alkali-activated persulfate technology will lead to high pH in water, and activated carbon activated persulfate technology does not have a high utilization rate of activated carbon
Compared with other activation methods, transition metal ion activation has low equipment requirements, low energy consumption, and easy operation. Currently, ferrous ion activated persulfate is the most widely used transition metal ion, but there are certain disadvantages in using ferrous ion activation. The stable existence of ferric ions requires acidic conditions and a high pH requirement, and when the ferrous ions are excessive, they will compete with pollutants for sulfate radicals, which limits the oxidation ability of persulfate

Method used

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  • Persulfate compound activator and its preparation method and application
  • Persulfate compound activator and its preparation method and application
  • Persulfate compound activator and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A persulfate composite activator of the present invention includes flake-shaped Co 3 O 4 And lumpy CeO 2 , The flaky Co 3 O 4 CeO covered in block 2 Surface, where Co 3 O 4 Co and CeO in 2 The molar ratio of Ce in it is 2.6:1.4.

[0033] The method for preparing the persulfate composite activator of this embodiment includes the following steps:

[0034] (1) Weigh 2.7g of cobalt nitrate, 2.2g of cerium nitrate and 4.9g of polyvinyl alcohol to grind in an agate mortar, wherein the molar ratio of cobalt to cerium is 2.6:1.4, and the masses of polyvinyl alcohol, cerium nitrate and cobalt nitrate are combined The ratio is 1:1.

[0035] (2) Put the mixture obtained after uniform grinding in step (1) into a crucible, pour 15ml of deionized water, and after mixing, put it into a muffle furnace for calcination, and control the heating rate of the muffle furnace to 10℃ / min, kept at 500°C for 30 min, and the calcined product is cooled and ground to obtain the cobalt tetroxide-ceria per...

Embodiment 2

[0037] A persulfate composite activator of the present invention, its composition and structure are basically the same as those in the examples, and the only difference is that Co 3 O 4 Co and CeO in 2 The molar ratio of Ce in it is 2.8:1.2.

[0038] The preparation method of the persulfate composite activator of this embodiment described above is basically the same as that of embodiment 1, except that: in step (1), the molar ratio of cobalt in cobalt nitrate to cerium in cerium nitrate is 2.8: 1.2, named Co 3 O 4 / CeO 2 -2.

Embodiment 3

[0040] A persulfate composite activator of the present invention, its composition and structure are basically the same as those in the examples, and the only difference is that Co 3 O 4 Co and CeO in 2 The molar ratio of Ce in it is 3.0:1.0.

[0041] The preparation method of the persulfate composite activator of this embodiment described above is basically the same as that of Example 1, except that: in step (1), the molar ratio of cobalt in cobalt nitrate to cerium in cerium nitrate is 3.0: 1.0, named Co 3 O 4 / CeO 2 -3.

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Abstract

The invention discloses a persulfate composite activator, a preparation method and applications thereof, wherein the persulfate activator comprises flaky Co3O4 and block-like CeO2, and the flaky Co3O4is fixed on the surface of the block-like CeO2. The preparation method comprises: mixing a cobalt source, a cerium source and polyvinyl alcohol, grinding, adding water, uniformly mixing, and calcining the obtained slurry to obtain a persulfate composite activator. According to the present invention, with the application of the persulfate activator activated persulfate to perform oxidative degradation on tetracycline, the disadvantages of narrow pH value range, low removal efficiency and the like in the removal of antibiotic wastewater with ferrous salt activated persulfate in the prior art can be overcome; and the persulfate activator has advantages of stable catalytic performance, good activation effect, strong corrosion resistance, environmental protection, recyclability and the like.

Description

Technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to a persulfate composite activator and a preparation method and application thereof. Background technique [0002] Advanced oxidation technology is a new technology developed in recent years for the treatment of refractory organic pollutants. It has the advantages of short cycle, quick effect, low cost and good treatment effect. It has become a research field in the field of medical wastewater treatment at home and abroad. Hot spots and frontiers. In particular, the activated persulfate advanced oxidation technology has the advantages of strong stability, good solubility, wide applicable pH range and long life of the sulfate radicals generated compared with the traditional advanced oxidation technology such as Fenton method, which is more conducive to high Degradation of concentration of organic pollutants. [0003] Under normal temperature conditions, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C02F1/72C02F101/34C02F101/38
Inventor 袁兴中管仁鹏陈晓红吴志斌曾光明
Owner HUNAN UNIV
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