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A kind of cobalt-manganese hydrotalcite aerogel and its preparation method and application

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

Active Publication Date: 2022-07-01
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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  • A kind of cobalt-manganese hydrotalcite aerogel and its preparation method and application
  • A kind of cobalt-manganese hydrotalcite aerogel and its preparation method and application
  • A kind of cobalt-manganese hydrotalcite aerogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In the present embodiment, the Co / Mn molar ratio is selected as 3:1 salt solution and NaOH / Na 2 CO 3 The lye 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 Mn-LDH / GO mass ratio of 1:2. Metronidazole (MTZ) was selected as the representative of the new organic pollutants, and the degradation experiment was carried out by the method of the present invention, the method for activating persulfate degrading pollutants by cobalt-manganese hydrotalcite aerogel under visible light catalysis of the present invention.

[0043] The experimental steps are as follows:

[0044] 1) Synthesis of 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:...

Embodiment 2

[0049] In this example, the cobalt-manganese hydrotalcite aerogel synthesized in Example 1 is used, and metronidazole (MTZ) is selected as the representative of new organic pollutants, and the present invention is used under the conditions of adding free radicals and non-radical quenchers Degradation experiments were carried out on the method of persulfate degrading pollutants activated by cobalt-manganese hydrotalcite aerogel under visible light catalysis. 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) was 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. TBA, MeOH, p-BQ, FFA were added to fo...

Embodiment 3

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

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

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Abstract

The invention belongs to the technical field of pollutant treatment, and specifically discloses a cobalt-manganese hydrotalcite aerogel and a preparation method and application thereof. The method is (1) converting Co(NO 3 ) 2 ·6H 2 O and Mn (NO 3 ) 2 The aqueous solution is added to water to form a salt solution, and then the salt solution is mixed with the alkali solution, and the resulting precipitate is Co 3 Mn-LDH; (2) the Co 3 Mn-LDH is mixed with graphene oxide solution and ultrasonically dispersed, then sodium ascorbate is added, the above mixed solution is heated and reacted, and the cobalt-manganese hydrotalcite aerogel is obtained after freeze-drying. Under the excitation of visible light, the hole-electron pair of the cobalt-manganese hydrotalcite accelerates the separation, and the excellent conductivity and wide electron transfer channels of the three-dimensional aerogel accelerate the conduction of electrons, thereby promoting the generation of more persulfate. Reactive oxidants such as sulfate radicals and hydroxyl radicals oxidatively decompose organic pollutants, eventually producing water and carbon dioxide.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment, and particularly relates to a cobalt-manganese hydrotalcite aerogel and a preparation method and application thereof. Background technique [0002] In the past few decades, with the large-scale 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 not treated in time, the ecological balance of the water system will be seriously damaged. , and ultimately endanger humanity itself. Under the circumstance that conventional wastewater treatment processes are not satisfactory for organic wastewater treatment, persulfate-based advanced oxidation methods are widely considered to have strong potential and important prospects because of their ability to generate highly oxidatively active free radicals. Among them, the persulfate activation technology using metal sem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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