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Triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst as well as preparation method and application thereof

A technology of triammonium citrate and composite catalyst, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of poor recycling, poor catalytic activity, and high risk of leaching, and achieve high utilization rate High, large grain size, effect of increasing active sites

Active Publication Date: 2022-08-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt-based hydrotalcite catalysts prepared by existing preparation methods have problems such as poor catalytic activity, poor recyclability, and high risk of leaching, while hydrotalcite catalysts using trace amounts of cobalt doped with relatively controllable environmental risks have poor catalytic efficiency.

Method used

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  • Triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst as well as preparation method and application thereof
  • Triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst as well as preparation method and application thereof
  • Triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of the triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite composite catalyst of the present invention comprises the following steps:

[0039] (1) Take by weighing analytically pure cobalt nitrate hexahydrate 0.1750g, magnesium nitrate hexahydrate 7.6490g, aluminum nitrate nonahydrate 3.7500g as raw materials, place it in a 150ml beaker, add 50ml resistivity to 18.25Ω -1 The ultrapure water was placed on a magnetic stirrer and stirred until it was completely dissolved to obtain a mixed solution.

[0040] (2) 10.5000g of urea was added to the above mixed solution, and after the urea was fully dissolved, 0.1046g of triammonium citrate was added and stirred for 15min until the mixed solution showed a clear pink color to obtain a catalyst precursor complex salt solution.

[0041] (3) hydrothermally react the above-mentioned catalyst precursor compound salt solution at 140° C. for 24 hours, and the product obtained by ...

Embodiment 2

[0050] An application of a triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite composite catalyst in the treatment of antibiotic wastewater, specifically using a trace cobalt-doped magnesium-aluminum ternary hydrotalcite modified by triammonium citrate The talc composite catalyst activates persulfate to degrade ciprofloxacin in water, including the following steps:

[0051] Get five 150mL beakers, add the ciprofloxacin solution of 100ml, 20mg / L, then add the triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite composite catalyst ( CA0.5-LDH, CA1-LDH, CA5-LDH, CA10-LDH), a trace amount of cobalt-doped magnesium-aluminum hydrotalcite composite catalyst (Co-LDH) prepared in Comparative Example 1, 20 mg each, and then added to each beaker 50 mg of potassium hydrogen peroxymonosulfate compound salt (Oxone) was added to the mixture, uniformly mixed, and stirred at a rotating speed of 400 r / min to carry out cataly...

Embodiment 3

[0056] The effect of triammonium citrate-modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalysts on the degradation of antibiotic wastewater under different pH conditions was investigated. Specifically, trace cobalt-doped magnesium modified by triammonium citrate was used. The aluminum ternary hydrotalcite composite catalyst activates persulfate to degrade ciprofloxacin in water, including the following steps:

[0057] The ciprofloxacin solutions with pH of 3, 5, 7, 9, and 11 were prepared respectively (the initial concentration of the solution was 20 mg / L and the volume was 100 mL), and 20 mg of triammonium citrate modified trace amount prepared in Example 1 was added. Cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst (CA1-LDH), followed by adding 50 mg of potassium hydrogen peroxymonosulfate composite salt (Oxone), stirring at a rotational speed of 400 r / min, to carry out catalytic degradation reaction, and compl...

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Abstract

The invention discloses a triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst and a preparation method and application thereof.The preparation method of the catalyst comprises the steps that cobalt salt, magnesium salt, aluminum salt, an alkali source and triammonium citrate are mixed to prepare a catalyst precursor solution, and the catalyst precursor solution is subjected to a hydrothermal reaction to obtain the trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst. The triammonium citrate modified trace cobalt doped magnesium-aluminum ternary hydrotalcite composite catalyst is obtained. According to the preparation method disclosed by the invention, the triammonium citrate is used as a reducing agent to regulate and control the hydrothermal synthesis process, so that the prepared triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst has the advantages of low leaching risk, high catalytic activity, good recycling property and the like, and is a novel hydrotalcite catalyst with excellent performance; the method can be widely used for degrading organic pollutants (such as antibiotics) in a water body, and is high in use value and good in application prospect. The preparation method provided by the invention has the advantages of simple preparation conditions, high yield, low cost, strong operability and the like, and is easy for batch production.

Description

technical field [0001] The invention belongs to the field of preparation and application of a hydrotalcite-like-based catalyst, in particular to a triammonium citrate-modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst and a preparation method and application thereof. Background technique [0002] In recent years, Advanced Oxidation Processes (AOPs) have been regarded as an effective means to treat various environmental pollutants. Among them, the process of generating active species by activating persulfate (PS) is called advanced persulfate oxidation technology. . This technology has received extensive attention due to its ability to generate sulfate radicals (SO4·-). Compared with hydroxyl radical (·OH), sulfate radical has similar redox potential (SO4·-: 1.8-2.7V, ·OH: 1.5-2.8V) and higher lifetime (SO4·-: approx. 30-40 μs, OH: about 20 ns), so it has a higher potential in dealing with refractory pollutants. In addition, the per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J27/232B01J35/10B01J37/10B01J37/16C02F1/72C02F101/30
CPCB01J23/78B01J27/232B01J37/10B01J37/16C02F1/722C02F1/725C02F2101/30C02F2305/023B01J35/60Y02W10/37
Inventor 叶皓阳秦蕾赖萃柳诗语周雪融龙宝玉孙玉岩陈文芳谌文静秦钒治向玲
Owner HUNAN UNIV
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