Modified hydrotalcite/hydroxyl iron oxide composite material and preparation methods thereof

A technology of iron oxyhydroxide and composite materials, which is applied in the fields of chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., and can solve the problems of unsatisfactory removal efficiency of heavy metal ions, small specific surface area and wettability of hydrotalcite Poor performance and other problems, achieve good removal effect, large specific surface area, and improved removal effect

Inactive Publication Date: 2019-01-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wettability of hydrotalcite is poor, the specific surface area is small, and the removal efficiency of heavy metal ions cannot reach the expected effect.

Method used

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  • Modified hydrotalcite/hydroxyl iron oxide composite material and preparation methods thereof
  • Modified hydrotalcite/hydroxyl iron oxide composite material and preparation methods thereof
  • Modified hydrotalcite/hydroxyl iron oxide composite material and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of modified hydrotalcite / iron oxyhydroxide composites

[0034] The preparation method is as follows:

[0035] (1) Prepare a dodecylpyridinium bromide solution with a concentration of 0.1mmol / L, add hydrotalcite to the dodecylpyridinium bromide solution under mechanical stirring, and the addition amount is 20g / L. Stir at 200r / min for 1.5h to prepare a modified hydrotalcite mixture;

[0036] (2) Separating the modified hydrotalcite mixture from solid to liquid, washing the solid with distilled water for 2 to 3 times, placing the washed solid in a vacuum drying oven, and drying under vacuum at 25°C for 8 hours to obtain the modified hydrotalcite Hydrotalcite;

[0037] (3) preparation concentration is the ferric chloride solution of 0.01mol / L, is that the sodium hydroxide solution of 0.5mol / L is regulated the pH value of ferric chloride solution to 2.8 with concentration, makes ferric oxyhydroxide suspension;

[0038](4) Add modified hydrotalcite to the ferri...

Embodiment 2

[0041] Preparation of modified hydrotalcite / iron oxyhydroxide composites

[0042] The preparation method is as follows:

[0043] (1) Prepare a cetyltrimethylammonium bromide solution with a concentration of 2mmol / L, add hydrotalcite to the cetyltrimethylammonium bromide solution under mechanical stirring, and the addition amount is 70g / L , stirred at 200r / min for 1h at room temperature to prepare a modified hydrotalcite mixture;

[0044] (2) Separating the modified hydrotalcite mixture from solid to liquid, washing the solid with distilled water for 2 to 3 times, placing the washed solid in a vacuum drying oven, and drying under vacuum at 30°C for 6 hours to obtain the modified hydrotalcite Hydrotalcite;

[0045] (3) preparation concentration is the ferric sulfate solution of 0.15mol / L, is that the sodium hydroxide solution of 1mol / L is regulated the pH value of ferric sulfate solution to 3.0 with concentration, makes ferric oxyhydroxide suspension;

[0046] (4) Add modifie...

Embodiment 3

[0049] Preparation of modified hydrotalcite / iron oxyhydroxide composites

[0050] The preparation method is as follows:

[0051] (1) preparation concentration is the octadecyltrimethylammonium chloride solution of 5mmol / L, adds hydrotalcite in the octadecyltrimethylammonium chloride solution under mechanical stirring condition, and the addition is 135g / L , stirring at 250r / min for 0.5h at room temperature to obtain a modified hydrotalcite mixture;

[0052] (2) Separating the modified hydrotalcite solution from solid to liquid, washing the solid with distilled water for 2 to 3 times, placing the washed solid in a vacuum drying oven, and drying under vacuum at 35°C for 5 hours to obtain modified water talc;

[0053] (3) preparation concentration is the ferric sulfate solution of 0.24mol / L, is that the sodium hydroxide solution of 1.5mol / L is regulated the pH value of ferric sulfate solution to 4.7 with concentration, makes ferric oxyhydroxide suspension;

[0054] (4) Add modi...

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Abstract

The invention discloses a modified hydrotalcite / hydroxyl iron oxide composite material and preparation methods thereof. A preparation method I comprises the following steps: taking a cationic surfactant as a modifier, adding hydrotalcite into the solution of the cationic surfactant according to the adding amount of 20-250 g / l, carrying out mechanical stirring, filtering, washing with water, and carrying out vacuum drying to prepare modified hydrotalcite; adjusting the pH value of an iron salt solution to 2.8-6.6 to prepare a hydroxyl iron oxide suspension, adding the modified hydrotalcite intothe suspension according to the adding amount of 25-300 g / l, carrying out mechanical stirring, filtering, and carrying out vacuum drying to obtain the modified hydrotalcite / hydroxyl iron oxide composite material. A preparation method II comprises the following steps: dissolving the cationic surfactant in the iron salt solution, and adjusting the pH value of the solution to 2.8-6.6 to prepare a mixed solution of hydroxyl iron oxide and the cationic surfactant, adding the hydrotalcite into the mixed solution according to the adding amount of 30-300 g / l, carrying out mechanical stirring, filtering, and carrying out vacuum drying. The prepared composite material is good in wettability, and large in specific surface area, and has relatively good removal effects on pb < 2 + >, Cu < 2 + > and other heavy metal cations and arsenite anions.

Description

technical field [0001] The invention belongs to the technical field of hydrotalcite composite materials for wastewater treatment, and in particular relates to a modified hydrotalcite / iron oxyhydroxide composite material for removing heavy metals in wastewater and a preparation method thereof. Background technique [0002] Heavy metal ions are characterized by persistence, bioaccumulation, and toxicity. After entering the environment, they can only be transferred, diluted or accumulated, but cannot be eliminated, so they are more harmful. At present, the treatment methods of heavy metal wastewater are mainly chemical precipitation method, redox method, extraction method, reverse osmosis membrane method, electrodialysis method and adsorption method, among which chemical precipitation method and adsorption method are often used for pretreatment and advanced treatment of heavy metal wastewater . [0003] Commonly used materials for treating heavy metal wastewater include activa...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/06B01J20/30C02F1/28C02F101/20C02F101/10C02F103/16
CPCB01J20/041B01J20/06B01J20/08B01J2220/4806B01J2220/4812C02F1/281C02F2101/103C02F2101/20C02F2103/16
Inventor 刘红刘冰雪李志学徐积昀
Owner WUHAN UNIV OF SCI & TECH
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