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Magnesium-aluminum-iron hydrotalcite, preparation method and application thereof as coadsorbent

A technology of hydrotalcite and magnesium aluminum iron, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of difficult regeneration of adsorbents, single type of pollutants, high cost, and achieve good application prospects , the effect of easy availability of raw materials and low production cost

Inactive Publication Date: 2011-02-02
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to disclose a magnesium-aluminum-iron-type hydrotalcite and its preparation method and its application as a co-adsorbent, so as to overcome the difficulty in regeneration of the existing adsorbent, the high cost and the single type of pollutants to be treated. Insufficient to meet the needs of the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolving magnesium nitrate, aluminum nitrate and ferric nitrate in deionized water to prepare a mixed salt solution, the concentration of magnesium salt is 0.5mol / L, and the molar ratio is: Mg:Al:Fe=3:0.5:0.5;

[0025] Under stirring, add the above mixed salt solution to NaOH and NaOH 2 CO 3 In the mixed alkaline solution, the mixed alkaline solution is 1.0mol / L NaOH solution and 1.0mol / L NaOH 2 CO 3 Equal-volume mixture of the solution, the final pH is controlled to be about 11, heated and aged at 65°C for 24 hours, vacuum filtered, washed with deionized water until the pH is less than 8, and the filter cake is dried at 80°C for 24 hours to obtain magnesium-aluminum-iron-type hydrotalcite. Its chemical structure is shown in formula (1), wherein y is 4.2 and x is 0.25.

[0026] Then, the prepared magnesium-aluminum-iron-type hydrotalcite was calcined at 500° C. for 4 hours to obtain the adsorbent.

[0027] Weigh 125.0 mg of phenol solid and K 2 Cr 2 o 7 Dissolv...

Embodiment 2

[0032] Magnesium sulfate, aluminum sulfate and ferric sulfate are dissolved in deionized water to prepare a mixed salt solution, the concentration of the magnesium salt is 0.25mol / L, and the molar ratio is: Mg:Al:Fe=1:1.5:1.5;

[0033] Under stirring, add the above mixed salt solution to NaOH and NaOH 2 CO 3 In the mixed alkaline solution, the mixed alkaline solution is 2.0mol / L NaOH solution and 2.0mol / L NaOH 2 CO 3 Equal-volume mixture of the solution, the final pH is controlled to be about 11, heated and aged at 65°C for 24 hours, vacuum filtered, washed with deionized water until the pH is less than 8, and the filter cake is dried at 100°C for 14 hours to obtain magnesium-aluminum-iron-type hydrotalcite. Its chemical structure is shown in formula (1), wherein y is 2.0 and x is 0.75.

[0034] Then, the prepared magnesium-aluminum-iron-type hydrotalcite was calcined at 450° C. for 6 hours to obtain the adsorbent.

[0035] Using the same method as in Example 1 to detect, ...

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PUM

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Abstract

The invention provides magnesium-aluminum-iron hydrotalcite, a preparation method and application thereof as a coadsorbent. The preparation method comprises the following steps of: adding a mixed salt solution to an alkali solution to carry out a coprecipitation reaction by controlling the pH of the reaction ending point to 8.0-12; and then aging, filtering, washing and drying to obtain the magnesium-aluminum-iron hydrotalcite, wherein the mixed salt solution comprises magnesium salts, aluminum salts and iron salts, and after the magnesium-aluminum-iron hydrotalcite is roasted at 300-800 DEG C for 1-10 hours, an adsorbent for coadsorbing phenol and chromium (VI) in water is obtained. The invention has the advantages of moderate reaction condition, easy raw material obtaining, low production cost and reusability, and the adsorption rates of the phenol and the chromium (VI) can both reach higher 70 percent, thus the magnesium-aluminum-iron hydrotalcite has good application prospect. The chemical structural general formula of the magnesium-aluminum-iron hydrotalcite is as follows: [M2<+1>-xM3+x(OH)2]x+(CO3<2->)x / 2.yH2O.

Description

technical field [0001] The invention relates to magnesium-aluminum-iron hydrotalcite, its preparation method and its application as co-adsorption of phenol and chromium (VI) in water. Background technique [0002] Water bodies, especially drinking water sources, contain a wide range of pollutants, especially phenol, chromium (VI), etc., which pose a serious threat to the environment and human health. Adsorption is the most widely and effective purification technology for water polluted by such pollutants. The adsorbents used to adsorb phenol and chromium (VI) are mainly activated carbon and macroporous resin, but the regeneration of activated carbon is difficult, and the macroporous The cost of resin is also high, therefore, the development of efficient and cheap adsorbent has important practical value. [0003] At present, it is an important research direction to use efficient and cheap hydrotalcite-like materials to adsorb phenol and chromium (VI) in water. Patents CN200...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F101/34C02F1/62B01J20/30C02F1/58C02F101/22C01G49/00B01J20/08
Inventor 王远强陈思浩包一鸣钟磊曹杰肖稳发刘锡建
Owner SHANGHAI UNIV OF ENG SCI
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