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Sodium tartrate modified copper-cobalt-iron hydrotalcite supported carbon quantum dot nanocomposite material and preparation method and application thereof

A nano-composite material and sodium tartrate technology, which is applied in the field of catalytic degradation of organic wastewater, can solve the problems of decreased cycle performance of hydrotalcite-like catalysts, less use of wet catalytic air oxidation, heavy metal pollution, etc., so as to reduce secondary pollution and accelerate Electron transfer, cost saving effect

Active Publication Date: 2019-09-27
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most of the advanced oxidation methods for hydrotalcite-like removal of organic pollutants are to combine hydrotalcite-like catalysts with oxidants such as hydrogen peroxide and persulfate to remove pollutants. At present, wet catalytic air oxidation is rarely used. Economical, green and stable, low energy consumption technology
Although the existing hydrotalcite-like catalyst combined with hydrogen peroxide can quickly remove organic pollutants, the oxidizing agent will cause damage to the structure of the hydrotalcite-like catalytic material, resulting in a decrease in the cycle performance of the hydrotalcite-like catalyst and an increase in cost due to the dissolution of heavy metal ions , and cause certain heavy metal pollution

Method used

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  • Sodium tartrate modified copper-cobalt-iron hydrotalcite supported carbon quantum dot nanocomposite material and preparation method and application thereof
  • Sodium tartrate modified copper-cobalt-iron hydrotalcite supported carbon quantum dot nanocomposite material and preparation method and application thereof
  • Sodium tartrate modified copper-cobalt-iron hydrotalcite supported carbon quantum dot nanocomposite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Press Cu 2+ :Co 2+ : Fe 3+ The molar ratio is 1:0.5:1 to synthesize Cu-Co-Fe-LDH. Prepare two 500mL mixed solutions respectively, marked as solution A and solution B, wherein solution A contains 24.16g Cu(NO 3 ) 2 ·3H 2 O, 29.1g Co(NO 3 ) 2 ·6H 2 O and 40.4g Fe(NO 3 ) 2 9H 2 O, solution B contains 24g NaOH and 5.3g Na 2 CO 3 , and then the prefabricated solution was slowly dripped into a flask with three necks (containing 100 mL of ultrapure water) with a peristaltic pump under vigorous stirring at 60 ° C, and passed N 2 Gas purging protection to keep the pH value of the mixed solution at 8.5±0.2. After the reaction, seal the three-necked flask, age the precipitate at 65°C for 18 hours in a constant temperature tank, then filter it, wash it repeatedly with ultrapure water until the pH value is neutral, and place the sample in an oven at 80°C Dry in medium for 12h until reaching constant weight, grind and pulverize to obtain Cu-Co-Fe-LDH.

Embodiment 2

[0041] Press Cu 2+ :Co 2+ : Fe 3+ Cu-Co-Fe-LDH was synthesized at a molar ratio of 0.5:1:1. Prepare two 500mL mixed solutions respectively, marked as solution A and solution B, wherein solution A contains 24.16g Cu(NO 3 ) 2 ·3H 2 O, 29.1g Co(NO 3 ) 2 ·6H 2 O and 40.4g Fe(NO 3 ) 2 9H 2 O, solution B contains 24g NaOH and 5.3g Na 2 CO 3 , and then the prefabricated solution was slowly dripped into a flask with three necks (containing 100 mL of ultrapure water) with a peristaltic pump under vigorous stirring at 60 ° C, and passed N 2 Gas purging protection to keep the pH value of the mixed solution at 8.5±0.2. After the reaction, seal the three-necked flask, age the precipitate at 65°C for 18 hours in a constant temperature tank, then filter it, wash it repeatedly with ultrapure water until the pH value is neutral, and place the sample in an oven at 80°C Dry in medium for 12h until reaching constant weight, grind and pulverize to obtain Cu-Co-Fe-LDH.

Embodiment 3

[0043] Press Cu 2+ :Co 2+ : Fe 3+ The molar ratio is 1:1:1 to synthesize Cu-Co-Fe-LDH. Prepare two 500mL mixed solutions respectively, marked as solution A and solution B, wherein solution A contains 24.16g Cu(NO 3 ) 2 ·3H 2 O, 29.1g Co(NO 3 ) 2 ·6H 2 O and 40.4g Fe(NO 3 ) 2 9H 2 O, solution B contains 24g NaOH and 5.3g Na 2 CO 3 , and then the prefabricated solution was slowly dripped into a flask with three necks (containing 100 mL of ultrapure water) with a peristaltic pump under vigorous stirring at 60 ° C, and passed N 2 Gas purging protection to keep the pH value of the mixed solution at 8.5±0.2. After the reaction, seal the three-necked flask, age the precipitate at 65°C for 18 hours in a constant temperature tank, then filter it, wash it repeatedly with ultrapure water until the pH value is neutral, and place the sample in an oven at 80°C Dry in medium for 12h until reaching constant weight, grind and pulverize to obtain Cu-Co-Fe-LDH.

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Abstract

The invention discloses a sodium tartrate modified copper-cobalt-iron hydrotalcite supported carbon quantum dot nanocomposite material and a preparation method and application thereof. Sodium tartrate modified copper-cobalt-iron hydrotalcite is obtained by taking copper salt, cobalt salt and iron slat as raw materials, and sodium tartrate as a modifier through a hydrothermal reaction, and is compounded with carbon quantum dots to obtain the sodium tartrate modified copper-cobalt-iron hydrotalcite supported carbon quantum dot nanocomposite material. The composite material can efficiently remove organic matters in organic wastewater by wet catalytic air oxidation under mild conditions, especially the organic matters difficult to degrade such as nitrobenzene in the prior art; a catalyst is stable in composition; ion dissolution is small during catalysis; secondary pollution to the environment is reduced; cheap air can be taken as an oxidant; the cost is greatly reduced.

Description

technical field [0001] The invention relates to a catalyst material, in particular to a sodium tartrate-modified copper-cobalt-iron hydrotalcite-supported carbon quantum dot nanocomposite material (Cu-Co-Fe-LDH / ST / CQD), and also to a sodium tartrate-modified The invention discloses a preparation method of a copper-cobalt-iron-like hydrotalcite-supported carbon quantum dot nanocomposite material and its application in oxidative degradation of organic matter in organic wastewater, and belongs to the technical field of organic wastewater catalytic degradation. Background technique [0002] As an important chemical raw material, nitrobenzene (NB) is widely used in industries such as national defense, printing and dyeing, plastics, pesticides and medicine. Nitrobenzene is a highly toxic substance with strong carcinogenicity and mutagenicity. In addition, nitrobenzene is also a structurally stable aromatic hydrocarbon compound, which is difficult to biodegrade and can remain uncha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C02F1/74C02F101/30C02F101/38
CPCB01J31/223C02F1/74C02F1/725C02F2101/30C02F2101/38
Inventor 许银王邵鸿张思思王欢
Owner XIANGTAN UNIV
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