Method for preparing magnesium aluminum hydrotalcite nanosheets in one step for adsorbing phosphorus removal

A technology of magnesium aluminum hydrotalcite and nanosheets, which is applied in the field of environmental protection, can solve the problems of large specific surface area and small size of hydrotalcite nanosheets, and achieve the effects of good dispersion, short production time and high phosphorus removal efficiency

Inactive Publication Date: 2018-10-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared hydrotalcite nanosheets are small in size, large in specific surface area, and have a large number of surface hydroxyl adsorption active sites. Compared with traditional hydrotalcites, they have large adsorption capacity and high efficiency, and related patents have not been reported yet.

Method used

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  • Method for preparing magnesium aluminum hydrotalcite nanosheets in one step for adsorbing phosphorus removal
  • Method for preparing magnesium aluminum hydrotalcite nanosheets in one step for adsorbing phosphorus removal
  • Method for preparing magnesium aluminum hydrotalcite nanosheets in one step for adsorbing phosphorus removal

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Mix 100mL of urea solution containing 36.0g and 0.01mol·L -1 The sodium nitrate solution was placed in a water bath at 25°C; (2) Weighed 4.096g magnesium nitrate hexahydrate and 3.000g aluminum nitrate nonahydrate respectively and mixed them in 200mL deionized water; (3) Added dropwise to the urea solution Add magnesium-aluminum mixed solution and 1.0mol·L -1 Sodium hydroxide controls the pH to be 10; (4) under nitrogen protection, magnetically stirs for 15 minutes; (5) then at 10000r min -1 Centrifuge at high speed, wash with ethanol and deionized water repeatedly for three times, dry in a freeze dryer for 24 hours, and then grind to obtain hydrotalcite nanosheet powder.

[0025] In this embodiment, the X'Pert PRO MPD X-ray diffractometer (XRD) of PANalytical Company in the Netherlands is used to characterize the crystal structure of the prepared hydrotalcite nanosheets. figure 1 It is the XRD spectrum of hydrotalcite nanosheets. It can be seen from the figure th...

Embodiment 2

[0027] (1) Mix 100mL of urea solution containing 18.0g and 0.01mol·L -1 The sodium nitrate solution was placed in a water bath at 25°C; (2) Weighed 3.072g magnesium nitrate hexahydrate and 2.250g aluminum nitrate nonahydrate respectively, mixed and dissolved in 200mL deionized water; (3) simultaneously added dropwise to the urea solution Add magnesium-aluminum mixed solution and 0.5mol·L -1 Sodium hydroxide controls the pH to 10; (4) under the protection of nitrogen, magnetically stirs for 10 minutes; the rest of the preparation process is repeated in Example 1 (5).

Embodiment 3

[0029] (1) Mix 100mL of urea solution containing 54.0g and 0.01mol·L -1 Place the sodium nitrate solution in a water bath at 25°C; (2) Weigh 5.120g of magnesium nitrate hexahydrate and 3.750g of aluminum nitrate nonahydrate, mix and dissolve them in 200mL of deionized water; (3) drop by drop in the urea solution Add magnesium-aluminum mixed solution and 2.0mol·L -1 Sodium hydroxide was used to control the pH to 10; (4) under nitrogen protection, magnetic stirring was carried out for 30 minutes; the rest of the preparation process was repeated in Example 1 (5).

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Abstract

The invention provides a method for preparing magnesium aluminum hydrotalcite nanosheets in one step for adsorbing phosphorus removal, and belongs to the technical field of environmental protection. In the method, urea is used as a layer growth inhibitor, and the hydrotalcite nanosheets are prepared in one step in an aqueous urea solution. The preparation method controls the dropping rate to maintain pH constant by simultaneously adding a magnesium aluminum mixed salt solution and a sodium hydroxide solution to the aqueous urea solution, and after sufficient reaction, hydrotalcite nanosheet powder is obtained by centrifugation and lyophilization. A preparation process is simple, the production time is short, no organic solvent is used, and the method has the advantages of low cost, environmental friendliness and wide application range. The prepared hydrotalcite nanosheets have a large adsorption capacity and high phosphorus removal efficiency, and are adsorbent used for treating a highconcentration phosphorus-containing water body.

Description

(1) Technical field [0001] The invention relates to a method for preparing magnesium-aluminum hydrotalcite nanosheets for adsorption and dephosphorization in one step, and belongs to the technical field of environmental protection. (2) Background technology [0002] Phosphorus is an essential nutrient element for the growth of aquatic plants. In recent years, as the nutrient content in the water continues to rise, algae blooms, the dissolved oxygen in the water drops significantly, the biodiversity in the water drops sharply, and even the ecological system collapses and other environmental problems. The main way for phosphorus to enter the water environment is the discharge of phosphorus-containing industrial wastewater and domestic sewage, as well as phosphorus fertilizers, livestock and poultry manure, etc., which are washed by rainwater and enter the water body with surface runoff. Therefore, effective phosphorus removal before sewage discharge is an important means to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30C02F1/28C01F7/00B82Y40/00C02F101/10
CPCB01J20/041B01J20/08B82Y40/00C02F1/281C02F2101/105C01P2006/12C01P2002/72C01P2004/04B01J20/28004B01J2220/4806B01J2220/4812C01F7/785
Inventor 潘纲刘晨张美一
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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