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Chloride ion intercalated LDHs as well as preparation method and application thereof

A technology of chloride ion and intercalation, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as long time consumption, poor nitrate selectivity, and complicated LDHs preparation process, and achieve The effect of less time consumption, no loss of adsorbent, and excellent nitrate adsorption performance

Pending Publication Date: 2021-11-05
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of chloride ion intercalation LDHs and its preparation method and application, to solve the existing LDHs preparation process complex, time-consuming, poor selectivity to nitrate in water problem

Method used

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  • Chloride ion intercalated LDHs as well as preparation method and application thereof
  • Chloride ion intercalated LDHs as well as preparation method and application thereof
  • Chloride ion intercalated LDHs as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: Preparation of CNF-LDHs

[0047] With a nickel-iron ratio of 4:1, 0.008 mol / L nickel chloride, or 1.9015 g, and 0.002 mol / L ferric chloride, or 0.5406 g, were dissolved in 10 mL of distilled water by heating and stirring at 60°C, and then ultrasonically dispersed and mixed for 20 minutes. Prepare a 1 mol / L sodium hydroxide solution, that is, dissolve 4 g of sodium hydroxide in 100 mL of distilled water and stir well. Under vigorous stirring at room temperature, the nickel-iron mixed salt solution and sodium hydroxide solution were slowly added dropwise into a beaker filled with 40 mL of distilled water. The nickel-iron mixed salt solution and sodium hydroxide solution use a peristaltic pump to control the dropping rate, and use it during the dropping process p H meter control reaction p The H value was stable at 10 until the end of the dropwise addition of the nickel-iron mixed salt solution, and the peristaltic pump was turned off. After continuing to ...

Embodiment 2

[0052] Embodiment 2: Preparation of CNF-LDHs

[0053] The ratio of nickel to iron is 3:1; used in the process of dropping p H meter control reaction p The H value was stable at 9; the microwave temperature was set at 120°C for 30 min, and the reaction was carried out.

[0054] Others are all the same as in Example 1.

Embodiment 3

[0055] Embodiment 3: the preparation of CNF-LDHs

[0056] The ratio of nickel to iron is 5:1; used in the process of dropping p H meter control reaction p The H value was stable at 11; the microwave temperature was set at 140°C for 45 min to carry out the reaction.

[0057] Others are all the same as in Example 1.

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Abstract

The invention provides chloride ion intercalated LDHs as well as a preparation method and application thereof. The preparation method of the chloride ion intercalated LDHs comprises the following steps: (1), dropwise adding a mixed salt solution of nickel chloride and ferric chloride and a sodium hydroxide solution into a reaction vessel at the same time, controlling the reaction pH value in the dropwise adding process, and continuing to stir after dropwise adding is completed; (2) transferring the mixed solution obtained in the step (1) to a microwave synthesizer, and carrying out aging reaction; and (3) after the reaction is finished, carrying out suction filtration, washing and vacuum drying on the product. According to the method, the chloride ion intercalated ferronickel LDHs (CNF-LDHs) are successfully prepared by adopting a microwave-assisted coprecipitation double-drop method, so that the preparation process of the LDHs is obviously simplified, the preparation time is shortened, and the selective adsorption performance of nitrate is improved.

Description

technical field [0001] The invention relates to layered double metal hydroxides and their preparation methods and applications, in particular to chloride ion intercalation LDHs and their preparation methods and applications. Background technique [0002] In recent decades, nitrogen pollution in water bodies has become a major global concern. Many international and governmental organizations have established frameworks to reduce the level of nitrate contamination in the environment and food products, and most countries have established relevant control standards. At present, the nitrogen in my country's surface water mainly comes from the point source discharge of urban sewage treatment plants and the non-point source discharge of a large amount of nitrogen fertilizer used in the agricultural sector. Total nitrogen is an important indicator for measuring water quality standards in my country. Total nitrogen is referred to as TN, which refers to nitrogen-containing compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/28C02F1/28B01J20/30C02F101/16
CPCB01J20/08B01J20/06B01J20/28009C02F1/281C02F2101/163
Inventor 赵春霞张春辉张冠腾周郡李天一
Owner HEBEI UNIVERSITY
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