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A preparation method of porous hydroxyapatite particles for deep adsorption of copper ions in solution

A hydroxyapatite, deep adsorption technology, applied in the direction of ion exchange, selective adsorption, ion exchange regeneration, etc., can solve the problems of long standing adsorption time, failure to meet the discharge requirements, high residual ion concentration, etc., and achieve adsorption The effect of fast speed, high opening rate and simple process

Inactive Publication Date: 2019-11-29
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When only hydroxyapatite is used to adsorb copper ions, the problems of hydroxyapatite adsorbent are: (1) The time for static adsorption is too long, which takes more than ten hours; (2) The treatment depth is not enough, and the residual ion concentration is still high. (3) Granular hydroxyapatite is sintered at high temperature after forming particles, so that the interconnected pores are greatly reduced
In order to solve the shortage of nano-hydroxyapatite particle adsorbents prepared by traditional processes for the adsorption of copper ions, the preparation of porous hydroxyapatite particles that are aggregates of nanoparticles but not excessively sintered has become the focus and difficulty of research. very few reports

Method used

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  • A preparation method of porous hydroxyapatite particles for deep adsorption of copper ions in solution
  • A preparation method of porous hydroxyapatite particles for deep adsorption of copper ions in solution
  • A preparation method of porous hydroxyapatite particles for deep adsorption of copper ions in solution

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Effect test

Embodiment 1

[0019] (1) Prepare a citric acid solution with a concentration of 0.0520 moles per liter, add calcium hydroxide to make the concentration 0.6757 moles per liter, then drop in a phosphoric acid solution with a concentration of 0.8163 moles per liter, and stop the dripping when the pH=8.80 , after stirring for 1 hour, stand and age for 18 hours;

[0020] (2) Centrifuge the reaction solution prepared in step (1), and wash the obtained precipitate with ammonium chloride solution, wherein the mass ratio of ammonium chloride to calcium hydroxide is 1:2.5, and then centrifuge After separating and dispersing the obtained precipitate into an aqueous solution, add polyvinyl alcohol with an average degree of polymerization of 1750 so that the mass ratio of polyvinyl alcohol added to calcium hydroxide added is 0.002:2.5, and hydrothermally treat at 150°C for 6 Cool to room temperature after 1 hour;

[0021] (3) Centrifuge the colloidal solution prepared in step (2) to obtain a precipitat...

Embodiment 2

[0030] (1) Prepare a citric acid solution with a concentration of 0.0520 moles per liter, add calcium hydroxide to make the concentration 0.6757 moles per liter, then add dropwise a phosphoric acid solution with a concentration of 0.8163 moles per liter, and stop the dripping when pH=8.80 , after stirring for 1 hour, stand and age for 18 hours;

[0031](2) Centrifuge the colloidal solution prepared in step (1) to obtain a precipitate, and wash the obtained precipitate with an ammonium chloride solution, wherein the mass ratio of the amount of ammonium chloride to the amount of calcium hydroxide is 1: 2.5, after centrifuging and dispersing the obtained precipitate into an aqueous solution, add polyvinyl alcohol with an average degree of polymerization of 1750, so that the mass ratio of the amount of polyvinyl alcohol added to the amount of calcium hydroxide added is 0.001:2.5, at 150° Cool to room temperature after hydrothermal treatment under C for 6 hours;

[0032] (3) Centr...

Embodiment 3

[0035] (1) Prepare a citric acid solution with a concentration of 0.0520 moles per liter, add calcium hydroxide to make the concentration 0.6757 moles per liter, then drop in a phosphoric acid solution with a concentration of 0.8163 moles per liter, and stop the dripping when the pH=8.80 , stirred for 1 hour and left to age for 18 hours;

[0036] (2) Centrifuge the reaction solution prepared in step (1), and wash the obtained precipitate with ammonium chloride solution, wherein the mass ratio of ammonium chloride to calcium hydroxide is 1:2.5, and then centrifuge After separating and dispersing the obtained precipitate into an aqueous solution, add polyvinyl alcohol with an average degree of polymerization of 1750, so that the mass ratio of the amount of polyvinyl alcohol added to the amount of calcium hydroxide added is 0.003:2.5, and hydrothermally treat at 150°C for 6 Cool to room temperature after 1 hour;

[0037] (3) Centrifuge the colloidal solution prepared in step (2)...

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Abstract

The invention discloses a method for preparing porous hydroxyapatite particles for deeply absorbing copper ions in solution, belonging to the technical field of chemical preparation. First, drop the phosphoric acid solution into the calcium hydroxide suspension containing citric acid to prepare a solution containing hydroxyapatite colloid. After washing with ammonium chloride, add polyvinyl alcohol with an average degree of polymerization of 350 or 1750, and then After hydrothermal treatment at C for 6 hours, cool to room temperature and centrifuge, dry the sediment at 60°C and put it in a solution containing polyethylene glycol (average molecular weight: 2000), dry at 80°C, and then heat up After calcination at 600°C and heat preservation for 2 hours, cooling with the furnace, the obtained particles were crushed and sieved to prepare porous hydroxyapatite particles for deep adsorption of copper ions in the solution. The process of the method is simple, the price of raw materials is low, the prepared porous hydroxyapatite particles have high porosity and low crystallinity, and the removal speed, high removal rate and high adsorption capacity of copper ions in the solution are fast.

Description

technical field [0001] The invention discloses a method for preparing porous hydroxyapatite particles for deeply absorbing copper ions in solution, belonging to the technical field of chemical preparation. Background technique [0002] Wastewater containing copper ions is produced in industries such as metal electroplating, circuit board printing, and hydrometallurgical mineral waste treatment. Generally, the copper ions in the wastewater containing copper ions are adsorbed by adsorbents, and then discharged to external water bodies. Adsorbents include ion exchange resins, zeolites, activated carbon, and hydroxyapatite. Since hydroxyapatite is an inorganic component of human hard tissue and has good adaptability to the environment, using this type of material as an adsorbent conforms to the principle of sustainable development. Hydroxyapatite has ion exchange ability, and a lot of work has been carried out in the removal of copper ions in the solution. Chinese patent CN2009...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/28B01J20/30C02F1/28B01D15/08C02F101/20
CPCB01D15/08B01J20/048B01J20/28016C02F1/281C02F2101/20
Inventor 李成峰王维文王文浩史如静逯鹏葛筱璐
Owner SHANDONG UNIV OF TECH
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