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Preparation method of efficient adsorbent porous magnesium oxide

A porous magnesium oxide, adsorbent technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of not reaching drinking water, low adsorption efficiency, and difficult to meet continuous operations And other issues

Inactive Publication Date: 2013-02-06
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment of heavy metals in water includes chemical precipitation or physical adsorption. For the precipitation method, for the treatment of water with high solubility of heavy metal ions, some ions still cannot reach the standard of drinking water after being treated by this method; The efficiency is not high and it is difficult to meet the requirements of continuous operation

Method used

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  • Preparation method of efficient adsorbent porous magnesium oxide
  • Preparation method of efficient adsorbent porous magnesium oxide
  • Preparation method of efficient adsorbent porous magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The active carbon is soaked in water, ethanol or ethanol-water mixed solution with a concentration of 5wt%, 22wt%, and 40wt% magnesium nitrate and magnesium acetate respectively, stirred for 5 hours, filtered, dried, and calcined under a protective atmosphere. The calcining temperature is 300 ° C, At 450°C and 600°C, the calcination time is 10min, 180min, and 360min, respectively. The specific surface area and saturated adsorption capacity for lead ions of the samples obtained from the orthogonal experiments of each process are tested, as shown in Table 1.

[0014] Table 1 Specific surface area of ​​porous magnesium oxide and saturated adsorption capacity for lead ions

[0015]

Embodiment 2

[0017] Diatomaceous earth is soaked in water, ethanol or ethanol-water mixed solutions with concentrations of 5wt%, 22wt%, and 40wt% magnesium nitrate and magnesium acetate respectively, stirred for 5 hours, filtered, dried, and calcined in a protective atmosphere at a temperature of 300°C , 450°C, 600°C, the calcination time is 10min, 180min, 360min respectively. The specific surface area and saturated adsorption capacity for lead ions of the samples obtained from the orthogonal experiments of each process are tested, as shown in Table 2.

[0018] Table 2 Specific surface area of ​​porous magnesium oxide and saturated adsorption capacity for lead ions

[0019]

Embodiment 3

[0021] Soak the silica gel in water, ethanol or ethanol-water mixed solutions with a concentration of 5wt%, 22wt%, and 40wt% magnesium nitrate and magnesium acetate, stir for 5 hours, filter, dry, and calcinate in a protective atmosphere at 300°C and 450°C respectively. ℃, 600 ℃, the calcination time is 10min, 180min, 360min respectively. The specific surface area and saturated adsorption capacity for lead ions of the samples obtained from the orthogonal experiments of each process are tested, as shown in Table 3.

[0022] Table 3 Specific surface area of ​​porous magnesium oxide and saturated adsorption capacity for lead ions

[0023]

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Abstract

The invention relates to a preparation method of an efficient adsorbent porous magnesium oxide. The method is characterized by loading magnesium salts in ducts and surfaces of porous materials and obtaining the efficient adsorbent porous magnesium oxide through calcining, wherein the used magnesium salts are at least one of magnesium nitrate and magnesium acetate; the solvents of the magnesium salts are at least one of water and ethanol; the used porous materials are at least one of activated carbon, diatomite, silica gel and molecular sieves; the concentration of the magnesium salt solution is 5-40wt%; the calcination temperature is 300-600 DEG C; and the calcination time is 10-360min. The method has the advantages of simple needed equipment, short process flow, high preparation efficiency and low preparation cost. The prepared porous magnesium oxide has the advantages of large specific surface area, strong heavy metal ion adsorption capacity and high saturation adsorption, and has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of manufacturing inorganic materials, and in particular relates to a method for preparing a porous magnesium oxide high-efficiency adsorbent. Background technique [0002] With the development of industry, the discharge of industrial waste water, waste gas, and waste residue makes the lead, cadmium, and mercury in river waters and groundwater exceed the standard, seriously affecting people's health. At present, the treatment of heavy metals in water includes chemical precipitation or physical adsorption. For the precipitation method, for the treatment of water with high solubility of heavy metal ions, some ions still cannot reach the standard of drinking water after being treated by this method; The efficiency is not high and it is difficult to meet the requirements of continuous operation. [0003] As we all know, the properties that determine the adsorption material include its specific surface area, the ...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/28B01J20/20B01J20/14B01J20/10B01J20/18B01J20/30
Inventor 刘柏雄张丽娜许方
Owner JIANGXI UNIV OF SCI & TECH
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