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Preparation method of porous calcium alginate gel spheres for treating heavy metal sewage

A calcium alginate gel ball and sewage treatment technology, applied in the field of preparation of polymer porous materials, can solve the problems of large pore size uniformity, small specific surface area, affecting the adsorption effect of heavy metal ions, etc., and achieve the effect of improving the adsorption effect

Inactive Publication Date: 2019-02-22
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 4. The calcium alginate pellets currently used for heavy metal sewage treatment are all solid balls with relatively small specific surface area, which affects their adsorption effect on heavy metal ions
Although the preparation of porous calcium alginate gel spheres has been reported, the pore diameter of the gel spheres obtained by the preparation method is all in the micron order, and the pore diameter is relatively large and the uniformity of the pore diameter is relatively poor.

Method used

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  • Preparation method of porous calcium alginate gel spheres for treating heavy metal sewage
  • Preparation method of porous calcium alginate gel spheres for treating heavy metal sewage
  • Preparation method of porous calcium alginate gel spheres for treating heavy metal sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 20g of deionized water and 0.2g of sodium alginate were added into a 100ml beaker and stirred on a stirrer for 6h to form a 1% sodium alginate solution.

[0045] 0.05 g of 2% polystyrene microsphere emulsion was added to the above sodium alginate solution to form a mixed solution, the particle diameter of the microspheres was about 600 nm, and the mixed solution was placed on a stirrer and stirred for 6 hours.

[0046] The above homogeneous mixed solution was added dropwise into 0.2M calcium chloride solution with a dropper, and the formed gel balls were washed 3 times with deionized water and then put into a low-temperature refrigerator for freezing for 12 hours.

[0047] Put the frozen samples above into a vacuum freeze dryer for vacuum freeze drying for 48 hours, and then obtain porous calcium alginate gel balls. The obtained sample is marked as 2#.

Embodiment 2

[0049] Add 0.1g 2% polystyrene microsphere emulsion to the 1% sodium alginate solution configured in Example 1 to form a mixed solution, the particle diameter of the microsphere is about 600nm, and the mixed solution is placed on a stirrer to stir 6h.

[0050] The above homogeneous mixed solution was added dropwise into 0.2M calcium chloride solution with a dropper, and the formed gel balls were washed 3 times with deionized water and then put into a low-temperature refrigerator for freezing for 12 hours.

[0051] Put the frozen samples above into a vacuum freeze dryer for vacuum freeze drying for 48 hours, and then obtain porous calcium alginate gel balls. The obtained sample is marked as 3#.

Embodiment 3

[0053] Add 0.5 g of 2% polystyrene microsphere emulsion to the 1% sodium alginate solution configured in Example 1 to form a mixed solution with a particle diameter of about 600 nm, and place the mixed solution on a stirrer to stir for 6 h .

[0054] The above homogeneous mixed solution was added dropwise into 0.2M calcium chloride solution with a dropper, and the formed gel balls were washed 3 times with deionized water and then put into a low-temperature refrigerator for freezing for 12 hours.

[0055] Put the frozen samples above into a vacuum freeze dryer for vacuum freeze drying for 48 hours, and then obtain porous calcium alginate gel balls. The obtained sample is marked as 4#.

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Abstract

The invention discloses a preparation method of porous calcium alginate gel spheres for treating heavy metal sewage. The method comprises the following steps: firstly, preparing a sodium alginate water solution with a certain concentration and adding a micron / nano microsphere solution into the sodium alginate water solution; continuously stirring to sufficiently mix the water solutions; then dropwise adding an obtained mixed solution into a calcium chloride solution to obtain calcium alginate gel spheres containing template microspheres; then washing the obtained gel spheres with water and carrying out vacuum freezing and drying; and finally, putting the obtained gel spheres into an organic reagent and carrying out ultrasonic immersion for a period of time to remove a micron / nano microsphere template, so as to obtain micron / nano porous calcium alginate gel spheres. The porous calcium alginate gel spheres with the pore diameter range of 100nm to 10mu m can be obtained. The specific surface area of the calcium alginate gel spheres is changed through adjusting the pore diameter, so that the exchange speed of ions in an adsorption process is increased and the adsorption effect on heavymetal ions is improved.

Description

technical field [0001] The invention relates to a preparation method of a polymer porous material, in particular to a preparation method of porous calcium alginate composite gel balls with controllable apertures. Background technique [0002] 1. Sodium alginate is a natural and environmentally friendly polymer material, which has the ability to concentrate solutions, form gels, and form films. Because it contains a large number of free carboxyl groups, it is easy to combine with heavy metal ions, so it has a strong chelating effect on heavy metal ions. [0003] 2. Studies have shown that the gel balls formed by sodium alginate and calcium ions (calcium alginate gel balls) have good adsorption capacity for heavy metal ions such as lead, copper, and cadmium, and can be used for the treatment of heavy metal sewage. [0004] 3. For the mechanism of calcium alginate gel ball adsorption of heavy metals, please refer to the attached figure 1 . [0005] 4. The calcium alginate pe...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/103B01J20/24B01J20/26B01J20/28019B01J20/28047C02F1/286C02F2101/20
Inventor 董彦杰桑大申白国梁潘林海何承东
Owner ANQING NORMAL UNIV
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