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Preparation method of grading magnesium and aluminum hydrotalcite capable of adsorbing Cr(VI)

A magnesium aluminum hydrotalcite and adsorbent technology, which is applied in the direction of separation methods, adsorption water/sewage treatment, chemical instruments and methods, etc., can solve the problems of complex preparation process and difficult control of magnesium aluminum hydrotalcite morphology, and achieve simple process , Good recycling ability, high adsorption effect

Inactive Publication Date: 2014-02-05
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively control the grain size, and the particle size distribution is uniform. The disadvantage is that the morphology of the prepared magnesium aluminum hydrotalcite is difficult to control, and the preparation process is complicated.
[0004] In summary, so far, there are few reports on the preparation of hierarchical magnesium aluminum hydrotalcites with various morphologies by structure regulator-assisted hydrothermal method, and then related to its adsorption performance on the highly toxic pollutant Cr(VI) and its cyclic regeneration.

Method used

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  • Preparation method of grading magnesium and aluminum hydrotalcite capable of adsorbing Cr(VI)
  • Preparation method of grading magnesium and aluminum hydrotalcite capable of adsorbing Cr(VI)
  • Preparation method of grading magnesium and aluminum hydrotalcite capable of adsorbing Cr(VI)

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Effect test

Embodiment 1

[0024] Embodiment 1: First, 6.14g magnesium nitrate hexahydrate and 3.0g aluminum nitrate nonahydrate are dissolved in 60ml distilled water (Mg 2+ The concentration is 0.4mol / L, Mg 2+ and Al 3+ The concentration ratio is 3), then add 21.6g urea and stir until dissolved (urea and Mg 2+ The molar ratio is 15.0), then 1.2 g of P123 (mass concentration: 2%) was added to the above solution, and stirred at room temperature until it was completely dissolved. Then, the above solution was transferred to a hydrothermal kettle and reacted at 140° C. for 24 h. The hydrothermal product is naturally cooled to room temperature, filtered, washed with distilled water until neutral, dispersed and washed with absolute ethanol and filtered, the obtained filter cake is vacuum-dried at 80°C for 12h, and roasted in a static air atmosphere at 500°C for 6h , the obtained sample is an adsorbent, that is, graded magnesium aluminum hydrotalcite, and its morphology is characterized by the coexistence o...

Embodiment 2

[0027] Embodiment 2: First, 2.44g magnesium chloride hexahydrate and 1.45g aluminum chloride hexahydrate are dissolved in 60ml distilled water (Mg 2+ The concentration is 0.2mol / L, Mg 2+ and Al 3+ The concentration ratio is 2), then add 7.2g urea and stir until dissolved (urea and Mg 2+ The molar ratio is 10.0), then 3.0 g of P123 (mass concentration: 5%) was added to the above solution, and stirred at room temperature until it was completely dissolved. Then, the above solution was transferred to a hydrothermal kettle and reacted at 140° C. for 36 h. The hydrothermal product is naturally cooled to room temperature, filtered, washed with distilled water until neutral, dispersed and washed with absolute ethanol and filtered, the resulting filter cake is vacuum-dried at 100°C for 4 hours, and roasted in a static air atmosphere at 600°C for 2 hours , the obtained sample is an adsorbent, that is, graded magnesium aluminum hydrotalcite, and its morphology is a sheet-like particle...

Embodiment 3

[0030] Example 3: First, 5.76g of anhydrous magnesium sulfate and 7.99g of aluminum sulfate octadecahydrate were dissolved in 60ml of distilled water (Mg 2+ The concentration is 0.8mol / L, Mg 2+ and Al 3+ The concentration ratio is 4), then add 28.8g urea and stir until dissolved (urea and Mg 2+ The molar ratio is 10.0), and then 6.0 g of P123 (mass concentration: 10%) was added to the above solution, and stirred at room temperature until it was completely dissolved. Then, the above solution was transferred to a hydrothermal kettle and reacted at 100° C. for 48 h. The hydrothermal product is naturally cooled to room temperature, filtered, washed with distilled water until neutral, dispersed and washed with absolute ethanol and filtered, the obtained filter cake is vacuum-dried at 60°C for 16h, and roasted at 400°C under a static air atmosphere for 8h The obtained sample is an adsorbent, that is, graded magnesium aluminum hydrotalcite, and its morphology is a bundle structure...

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Abstract

The invention discloses a preparation method of grading magnesium and aluminum hydrotalcite capable of adsorbing Cr(VI) and recycling. The method comprises the steps of firstly, sequentially adding a certain amount of sodium polyacrylate, Pluronic block copolymer P123 or F127 and a urea precipitating agent into magnesium salt solution and aluminum salt solution, stirring and dissolving and transferring to a hydrothermal kettle for performing hydrothermal treatment, naturally cooling, filtering, washing, vacuum drying and roasting a hydrothermal product to obtain magnesium and aluminum hydrotalcite with excellent Cr(VI) property. The method has the advantages of low-cost active ingredients, simple preparation technology, mild conditions, diversified product shapes and the like, and the prepared grading magnesium and aluminum hydrotalcite has good adsorption property on the Cr(VI) in a water body, and can be regenerated and recycled.

Description

technical field [0001] The invention relates to a magnesium aluminum hydrotalcite material used in the field of environmental purification, in particular to a preparation method of a graded magnesium aluminum hydrotalcite adsorbent which adsorbs Cr(VI) and can be recycled. Background technique [0002] Chromium is one of the common heavy metal elements in industrial wastewater. Chromium-containing wastewater is very harmful to the ecological environment and human health, especially Cr(VI) is very toxic and is easily absorbed and accumulated in the human body. Highly carcinogenic. Therefore, the treatment of chromium-containing wastewater has aroused the attention of all walks of life. There are more than ten kinds of treatment methods for Cr(VI)-containing wastewater, such as chemical precipitation, ion exchange, electrolysis, and adsorption. Among them, the porous solid adsorption method has the advantages of simple operation and strong practicability. The field of wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/28B01J20/30B01J20/34C02F1/28C02F1/62
Inventor 蔡卫权李广济余家国弗朗西斯·沃波特
Owner WUHAN UNIV OF TECH
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