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Desorption method based on adsorption of calcined bone apatite to heavy metal ions

A technology of heavy metal ions and bone apatite, applied in separation methods, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of inability to carry out secondary adsorption, improve cycle regeneration performance, reduce acidity, and cost cheap effect

Active Publication Date: 2021-03-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a desorption method based on the adsorption of heavy metal ions by calcined bone apatite, so that the bone apatite can be recycled and regenerated, and solve the problem that the secondary adsorption of bone apatite cannot be performed after adsorption in the prior art technical problems

Method used

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  • Desorption method based on adsorption of calcined bone apatite to heavy metal ions
  • Desorption method based on adsorption of calcined bone apatite to heavy metal ions
  • Desorption method based on adsorption of calcined bone apatite to heavy metal ions

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Embodiment 1

[0060] First, weigh 14.612g of ethylenediaminetetraacetic acid with a balance and dissolve it in a 1L beaker, seal the beaker with plastic wrap (to avoid the increase in concentration caused by the evaporation of heating water vapor), place it on a magnetic stirrer, heat to 80°C and stir for 12h to After the EDTA is completely melted, prepare an EDTA solution with a concentration of 0.05mol / L, then take 100mL of an EDTA aqueous solution with a concentration of 0.05mol / L and dilute it to 0.001mol / L, and then add Saturated calcium dihydrogen phosphate, configured as a pH=5 mixed solution, used as a desorption solution for osteogenic apatite to adsorb heavy metal ions (Cu, Zn, Pb, Cd).

[0061] Below with Pb 2+ The desorption process as an example:

[0062] 1 g of calcined bone apatite was placed in 50 mL of Pb 2+ Concentration is in the beaker of 200mg / L, and the beaker is sealed with plastic wrap, is placed in the vibration shaker and oscillates and absorbs for 24h. It can b...

Embodiment 2

[0068] First, weigh 14.612g of ethylenediaminetetraacetic acid with a balance and dissolve it in a 1L beaker, seal the beaker with plastic wrap (to avoid the increase in concentration caused by the evaporation of heating water vapor), place it on a magnetic stirrer, heat to 80°C and stir for 12h to After the EDTA is completely melted, it is prepared into an EDTA solution with a concentration of 0.05mol / L, and then saturated calcium dihydrogen phosphate is added to form a mixed solution with pH=3, which is used as a bone-forming apatite to adsorb heavy metal ions (Cu, Zn, Pb, Cd) desorption solution.

[0069] Below with Pb 2+ The desorption process as an example:

[0070] 1 g of calcined bone apatite was placed in 50 mL of Pb 2+ Concentration is in the beaker of 200mg / L, and the beaker is sealed with plastic wrap, is placed in the vibration shaker and oscillates and absorbs for 24h. It can be seen from Figure 1(a) and Figure 1(b) that it is mainly in the shape of a sheet, wi...

Embodiment 3

[0076] First, weigh 14.612g of ethylenediaminetetraacetic acid with a balance and dissolve it in a 1L beaker, seal the beaker with plastic wrap (to avoid the increase in concentration caused by the evaporation of heating water vapor), place it on a magnetic stirrer, heat to 80°C and stir for 12h to After the EDTA is completely melted, prepare an EDTA aqueous solution with a concentration of 0.05mol / L, then take 100mL of an EDTA aqueous solution with a concentration of 0.05mol / L and dilute it to 0.005mol / L, and then add Saturated calcium dihydrogen phosphate, configured as a pH=4 mixed solution, used as a desorption solution for bone apatite to adsorb heavy metal ions (Cu, Zn, Pb, Cd).

[0077] Below with Pb 2+ The desorption process as an example:

[0078] 1 g of calcined bone apatite was placed in 50 mL of Pb 2+ Concentration is in the beaker of 200mg / L, and the beaker is sealed with plastic wrap, is placed in the vibration shaker and oscillates and absorbs for 24h. It can...

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Abstract

The invention discloses a desorption method based on adsorption of calcined bone apatite to heavy metal ions, which comprises the following steps: soaking bone apatite adsorbed with heavy metal ions in a 0.001-0.05 mol / L mixed solution of an ethylenediamine tetraacetic acid aqueous solution and saturated monocalcium phosphate, controlling the pH value of the mixed solution to be 3-5, and carryingout oscillation desorption; and after the oscillation desorption is finished, carrying out ultrasonic cleaning on the bone apatite by using deionized water, and after the ultrasonic cleaning is finished, drying the bone apatite. The concentration of the ethylenediamine tetraacetic acid is 0.001-0.05 mol / L, the ethylenediamine tetraacetic acid is low in concentration and weak in acidity, and afterheavy metal ions are adsorbed on the surface of the bone apatite, the ethylenediamine tetraacetic acid can dissolve functional groups of the hydroxyapatite and compounds formed by the heavy metal ions, so that the product has desorption performance; then heavy metal ions adsorbed in the bone apatite can be effectively washed out through ultrasonic cleaning, the bone apatite has the adsorption capacity again after being dried, and the purpose of cyclic regeneration is achieved.

Description

technical field [0001] The invention relates to the field of desorption of adsorbent materials, in particular to a desorption method based on the adsorption of heavy metal ions by calcined bone apatite. Background technique [0002] Currently, 2.1 billion people around the world do not have safe drinking water at home, and heavy metals (cadmium, copper, zinc, lead, nickel, etc.) are important water pollutants that cause problems for the environment and humans. It is well known that exposure to heavy metals may cause health problems, including skin diseases, birth defects and cancer, among others. There are many methods for treating heavy metal ions in wastewater, including chemical precipitation, ion exchange, adsorption, membrane filtration, coagulation, and electrochemical methods. Adsorption plays an important role due to its design and operation flexibility, high efficiency, low cost, and also has reversibility, so it is considered as an effective, efficient, and inexpe...

Claims

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Application Information

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IPC IPC(8): B01J20/34C02F1/28C02F101/20
CPCB01J20/3475B01J20/3433B01J20/3441C02F1/281C02F2101/20Y02W10/37
Inventor 郭大刚张文丽
Owner XI AN JIAOTONG UNIV
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