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Cobalt-manganese hydrotalcite aerogel as well as preparation method and application thereof

A hydrotalcite and aerogel technology, applied in the field of pollutant treatment, can solve the problems of reduced catalytic activity, reduced surface area and active sites, environmental pollution, etc., and achieves short reaction time, significant removal effect, and low energy consumption. Effect

Active Publication Date: 2020-12-08
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 2D sheet-like structures tend to aggregate to reach a stable state, resulting in reduced surface area and active sites leading to reduced catalytic activity.
Furthermore, 2D semiconducting nanosheets can be easily filtered from the system into the aquatic environment and may interact with aquatic organisms, leading to potential environmental pollution.

Method used

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  • Cobalt-manganese hydrotalcite aerogel as well as preparation method and application thereof
  • Cobalt-manganese hydrotalcite aerogel as well as preparation method and application thereof
  • Cobalt-manganese hydrotalcite aerogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Select Co / Mn mol ratio as 3:1 salt solution and NaOH / Na in the present embodiment 2 CO 3 Alkaline solution with a molar ratio of 3:1, according to Co(NO 3 ) 2 ·6H 2 Cobalt-manganese hydrotalcite was synthesized with O / NaOH molar ratio of 1:2, followed by Co 3 Cobalt-manganese hydrotalcite aerogels were synthesized with a mass ratio of Mn-LDH / GO of 1:2. Metronidazole (MTZ) was selected as a representative of new organic pollutants, and the degradation experiment was carried out by using the method of cobalt manganese hydrotalcite airgel activating persulfate to degrade pollutants under visible light catalysis of the present invention.

[0043] The experimental steps are as follows:

[0044] 1) Synthetic cobalt manganese hydrotalcite (Co 3 Mn-LDH). 4.36545g Co(NO 3 ) 2 ·6H 2 O and 1168.5 μL of 50% Mn(NO 3 ) 2 The aqueous solution was added to 100 mL of pure water to form a salt solution with a Co / Mn molar ratio of 3:1. Combine 1.28g NaOH and 1.0599g Na 2 CO ...

Embodiment 2

[0049] In this embodiment, the cobalt-manganese hydrotalcite airgel synthesized in Example 1 is used, metronidazole (MTZ) is selected as the representative of new organic pollutants, and the present invention is used under the condition of adding free radicals and non-radical quenchers. Visible light-catalyzed cobalt-manganese hydrotalcite airgel activated persulfate to degrade pollutants was used for degradation experiments. Among them, tert-butanol (TBA) is used to quench hydroxyl radicals (·OH); methanol (MeOH) is used to quench sulfate radicals (·SO 4 - ) and hydroxyl radicals; p-benzoquinone (p-BQ) is used to quench superoxide radicals (·O 2 - ); Furfural (FFA) is used to quench singlet oxygen ( 1 o 2 ).

[0050] The experimental steps are as follows:

[0051] Prepare 200 mL of metronidazole solution with a concentration of 20 mg / L, and measure 40 mL of metronidazole solution in a quartz beaker. Add TBA, MeOH, p-BQ, FFA to four quartz beakers filled with metronidaz...

Embodiment 3

[0054] Take the cobalt manganese hydrotalcite / reduced graphene oxide airgel obtained in Example 1 to degrade metronidazole (MTZ), 2-methyl-4(5)-nitroimidazole (NTZ), secnidazole under photocatalysis (SCZ) Ornidazole (ORZ), Sulfamethizole (SMX), Diclofenac (DCF):

[0055] Take 40mL of MTZ, NTZ, SCZ, ORZ, SMX, DCF solutions with a concentration of 20mg / L respectively in a quartz beaker. Weigh 2 mg of cobalt manganese hydrotalcite / reduced graphene oxide airgel and 6 mg of PMS into the pollutant solution, turn on the xenon lamp equipped with a 420 nm cut-off filter for reaction. Degradation effect such as Figure 5 shown.

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Abstract

The invention belongs to the technical field of pollutant treatment, and particularly discloses cobalt-manganese hydrotalcite aerogel as well as a preparation method and application thereof. The method comprises the following steps:(1)adding Co(NO3)2.6H2O and a Mn(NO3)2 aqueous solution into water to form a salt solution, and then mixing the salt solution with an alkaline solution to obtain a precipitate, namely Co3MnLDH; and(2)mixing the Co3MnLDH with a graphene oxide solution, carrying out ultrasonic dispersion, adding sodium ascorbate, carrying out a heating reaction on the mixed solution,and carrying out freeze drying to obtain the cobalt-manganese hydrotalcite aerogel. Under excitation of visible light, hole-electron pairs of cobalt-manganese hydrotalcite are separated in an accelerated mode, electron conduction is accelerated through excellent electrical conductivity and a wide electron transfer channel of the three-dimensional aerogel, and then persulfate is promoted to generate more sulfate free radicals, hydroxyl free radicals and other active oxidants so as to oxidize and decompose organic pollutants, and finallywater and carbon dioxide are produced.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment, and in particular relates to a cobalt-manganese hydrotalcite airgel and a preparation method and application thereof. Background technique [0002] In the past few decades, with the mass production and use of dyes, endocrine disrupting compounds, pharmaceuticals and personal care products, the water environment around the world has been polluted to varying degrees. If it is not treated in time, the ecological balance of the water system will be seriously damaged. , and ultimately endanger human beings themselves. Where conventional wastewater treatment processes are unsatisfactory for organic wastewater treatment, persulfate-based advanced oxidation methods are widely considered to have strong potential and important prospects due to their ability to generate highly oxidatively active free radicals. Among them, the persulfate activation technology using metal semiconductor materials ...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J23/889B01J37/03B01J37/34B01J37/16B01J37/32C02F1/30C02F1/72C02F101/34C02F101/38C02F101/36
CPCB01J13/0091B01J23/8892B01J23/007B01J37/031B01J37/343B01J37/16B01J37/32C02F1/30C02F1/725C02F2305/10C02F2101/34C02F2101/38C02F2101/40C02F2101/36
Inventor 朱明山何少雄陆钢陈妍希
Owner JINAN UNIVERSITY
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