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Preparation method and application core-shell structure laminated double-metal hydroxide composite particles

A layered bimetallic, hydroxide technology, applied in the directions of alkali metal oxides/hydroxides, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of low affinity and poor dispersion of organic pollutants, and achieve The effect of low processing cost, convenient operation and simple process

Active Publication Date: 2017-01-18
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for preparing a core-shell structure layered double metal hydroxide composite particle for removing 2,4-dichlorophenoxyacetic acid in water, using carbon microspheres as the core and inorganic LDHs as the shell The core-shell structure composite particles solve the problem of poor dispersibility in water and low affinity for organic pollutants when general LDHs remove organic pollutants, and improve the removal rate

Method used

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  • Preparation method and application core-shell structure laminated double-metal hydroxide composite particles
  • Preparation method and application core-shell structure laminated double-metal hydroxide composite particles
  • Preparation method and application core-shell structure laminated double-metal hydroxide composite particles

Examples

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Effect test

Embodiment 1

[0032]Take 1000mL of wastewater containing 2,4-dichlorophenoxyacetic acid at a concentration of 100mg / L, and the temperature is 293K. Add the prepared treatment agent to the wastewater at a dosage of 1.5g / L, and use a pH regulator to adjust the pH of the system to 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, and the pH regulator is at a concentration of 0.1 mol / L NaOH solution and 0.1mol / L HNO 3 solution. During the reaction, maintain the oscillation speed at 200 rpm (can be adjusted from 150 rpm to 250 rpm), shake for 120 minutes, and then filter with a 0.45 μm filter membrane, take the treated liquid for water quality analysis, and determine the pH = 4, the removal rate can reach 97.32%, and the water quality is stable, such as image 3 As shown, the FT-IR spectrum of the treatment agent before and after adsorption of 2,4-dichlorophenoxyacetic acid is shown in 4.

Embodiment 2

[0034] Take 1000mL of waste water containing 2,4-dichlorophenoxyacetic acid, the pH is 4.0, the initial concentration of 2,4-dichlorophenoxyacetic acid is 5mg / L, 10mg / L, 30mg / L, 50mg / L, 80mg / L L, 120mg / L. The dosage of treatment agent is 1g / L, and the treatment temperature is controlled at 298K, 308K, 318K. During the reaction, the oscillation speed is 200 rpm (can be adjusted from 150 rpm to 250 rpm), and the oscillation time is 120 minutes. After the oscillation is completed, use a 0.45 μm filter membrane to filter, and take the treated liquid for water quality analysis. After data analysis, the saturated adsorption capacity at different temperatures was calculated, and the reaction was determined to be an endothermic reaction, and increasing the temperature would help to increase the removal rate of 2,4-dichlorophenoxyacetic acid.

[0035] The results of this embodiment are shown in the table below:

[0036]

Embodiment 3

[0038] Take 1000mL of wastewater containing 2,4-dichlorophenoxyacetic acid, the initial concentration of 2,4-dichlorophenoxyacetic acid in wastewater is 100mg / L and 200mg / L, the pH value is 4.0, and the adsorption temperature is 298K. Add the treatment agent to the wastewater at a dosage of 0.5 mg / L, the oscillation speed is 200 rpm (adjustable from 150 rpm to 250 rpm), and the oscillation time is 5 minutes to 120 minutes. After the treatment is completed Use a 0.45μm filter membrane to filter, and take the treated liquid for water quality analysis. It is confirmed that the rate of adsorption of 2,4-dichlorophenoxyacetic acid is relatively fast, and the adsorption equilibrium is basically reached in 60 minutes. The results of this example are as Figure 5 shown.

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Abstract

A preparation method and application laminated double-metal hydroxide composite particles of core-shell structures, includes the following steps that 1, a glucose solution performs hydrothermal reaction, and the obtained solid is washed, dried and grinded to obtain carbon microspheres; 2, magnesium chloride and aluminum chloride are mixed and dissolved by adding deionized water, dilute ammonia water is dropwise added to the mixed solution, standing is performed for crystallization, then a crystallized product is subjected to suction filtration and washing, filter cake is peptized and is converted into sol; 3, the carbon microspheres are dispersed in methanol to obtain a solution A, the product obtained in the step is dispersed in the methanol to obtain a colloidal solution B, the solution A and the solution B are mixed, centrifugal separation is conducted on the obtained product, drying and grinding are performed to obtain the laminated double-metal hydroxide composite particles of core-shell structures, and the particles are applied to removal of 2,4-dichlorphenoxyacetic acid in water. The fast adsorption purpose is achieved, and the preparation method is simple in process, convenient to operate, low in treatment cost and high in efficiency.

Description

technical field [0001] The invention relates to a preparation method of core-shell structure layered double metal hydroxide composite particles for removing 2,4-dichlorophenoxyacetic acid in water, belonging to the technical field of sewage treatment. [0002] technical background [0003] 2,4-Dichlorophenoxyacetic acid is a representative herbicide and plant growth regulator. Because of its high selectivity and low price, it is widely used to remove weeds in wheat, rice, corn and aquaculture, and it can also be used to prevent early abscission of fruits. However, due to the large-scale use and poor biodegradability of 2,4-dichlorophenoxyacetic acid, it widely exists in the environment and pollutes surface water and groundwater. Because 2,4-dichlorophenoxyacetic acid has a high endocrine disrupting effect, the World Health Organization (WTO) stipulates that its concentration in drinking water should not be higher than 20 μg / L. Therefore, it is very necessary to carry out th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/34C02F101/36
CPCB01J20/08B01J20/20B01J20/28019B01J20/28035C02F1/288C02F2101/34C02F2101/36
Inventor 李玉江张波吴涛孙德军
Owner SHANDONG UNIV