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Method for preparing efficient adsorbent through in-situ reaction

An in-situ reaction and adsorbent technology, applied in the directions of alkali metal oxides/hydroxides, inorganic chemistry, alkali metal compounds, etc., can solve the problems of difficult to meet continuous operation, unable to reach drinking water, low adsorption efficiency, etc.

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. Precipitation is used to treat water with high solubility of heavy metal ions. Some ions still cannot reach the standard of drinking water after being treated by this method; It is difficult to meet the requirements of continuous operation if it is not high

Method used

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  • Method for preparing efficient adsorbent through in-situ reaction
  • Method for preparing efficient adsorbent through in-situ reaction
  • Method for preparing efficient adsorbent through in-situ reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Soak activated carbon in water, ethanol or ethanol-water mixed solutions with a concentration of 5wt%, 22wt%, and 40wt% magnesium chloride, magnesium nitrate, and magnesium sulfate, stir for 5 hours, and add 10wt% NaOH solution dropwise to adjust the pH value to 8, 9.5, 11 , stirred for 1 hour, filtered, dried, and calcined in a protective atmosphere, the calcining temperatures were 300°C, 450°C, and 600°C, and the calcining times were 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.

[0015] Table 1 Specific surface area of ​​porous magnesium oxide and saturated adsorption capacity for lead ions

[0016]

[0017] The above experiments show that the most important factor affecting the specific surface area is the concentration of the solution, and other factors have less influence, so the following ...

Embodiment 2

[0019] Soak the diatomite in aqueous solutions of 5wt%, 22wt%, and 40wt% magnesium chloride respectively, stir for 5 hours, add 10wt% ammonia solution dropwise to adjust the pH value to 10, filter after stirring for 1 hour, dry, and calcinate in a protective atmosphere. 600°C and 180min calcination time respectively. The specific surface area and the saturated adsorption capacity of the samples obtained by each process were tested, as shown in Table 2.

[0020] Table 2 Specific surface area of ​​porous magnesium oxide and saturated adsorption capacity for lead ions

[0021]

Embodiment 3

[0023] Soak the silica gel in an aqueous solution of 5wt%, 22wt%, and 40wt% magnesium chloride, stir for 5 hours, add 10wt% ammonia solution dropwise to adjust the pH value to 10, stir for 1 hour, filter, dry, and calcinate in a protective atmosphere at a temperature of 600°C, the calcination time is 180min respectively. The specific surface area and saturated adsorption capacity of the samples obtained by each process were tested, as shown in Table 3.

[0024] Table 3 Specific surface area of ​​porous magnesium oxide and saturated adsorption capacity for lead ions

[0025]

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Abstract

The invention relates to a method for preparing an efficient adsorbent through in-situ reaction. The method is characterized by firstly chemically absorbing magnesium ions in ducts and surfaces of porous materials, then adjusting the pH value to 8-11, generating magnesium hydroxide in situ and obtaining the efficient adsorbent porous magnesium oxide through calcining, wherein the adopted magnesium salts are at least one of magnesium chloride, magnesium nitrate, magnesium acetate and magnesium sulfate; the solvents of the magnesium salts are at least one of water and ethanol; 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 high-efficiency adsorbents by in-situ reaction. 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. Precipitation is used to treat water with high solubility of heavy metal ions. Some ions still cannot reach the standard of drinking water after being treated by this method; It is difficult to meet the requirements of continuous operation if it is not high. [0003] As we all know, the properties that determine the adsorption material include its specific surface area, the charge state and quantity on the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/28B01J20/30B01J20/20B01J20/14B01J20/18B01J20/10
Inventor 刘柏雄许方张丽娜
Owner JIANGXI UNIV OF SCI & TECH
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