Magnetic nano hydroxyapatite adsorbent, preparation and application thereof

A technology of nano-hydroxyapatite and hydroxyapatite, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, chemical instruments and methods, etc., to achieve the effects of simple preparation, high adsorption efficiency and simple operation

Inactive Publication Date: 2010-05-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the relevant reports at home and abroad focus on the study of hydroxyapatite, hydroxyapatite composites, and nano-hydroxyapatite as adsorbents. There is still room for further improvement and improvement

Method used

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  • Magnetic nano hydroxyapatite adsorbent, preparation and application thereof
  • Magnetic nano hydroxyapatite adsorbent, preparation and application thereof
  • Magnetic nano hydroxyapatite adsorbent, preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A magnetic nano-hydroxyapatite adsorbent, the adsorbent is based on nano-hydroxyapatite, and magnetic powder Fe is uniformly dispersed in the matrix 2 o 3 , the molecular formula of nano-hydroxyapatite is Ca 10 (PO 4 ) 6 (OH) 2 , nano-hydroxyapatite and magnetic powder Fe 2 o 3 The mass ratio of is about 1.36, that is, the magnetic powder Fe 2 o 3 The mass fraction in the adsorbent is about 42.4%.

[0017] The preparation method of the above-mentioned magnetic nano-hydroxyapatite adsorbent in this embodiment is as follows:

[0018] At room temperature and under nitrogen atmosphere, 1.85mmoL of FeCl 2 4H 2 O and 3.7 mmoL FeCl 3 ·6H 2 O was dissolved in 30mL of deoxygenated water, then 10mL of 25% ammonia solution was added to the solution and mechanically stirred for 15min, and a precipitate was obtained after stirring evenly, and then 50mL of Ca(NO 3 ) 2 (containing solute 33.67mmol) and 50mL of (NH 4 ) 2 HPO 4 (containing 20mmol of solute) solution was...

Embodiment 2

[0021] The magnetic nano-hydroxyapatite adsorbent of the present invention prepared in Example 1 was added to each 20mL Cd-containing 2+ , Zn 2+ In the wastewater (the initial concentration of heavy metal ions in each wastewater is shown in Table 1), the amount of the adsorbent in each wastewater is 0.1g / L, adjust the pH value to 5.0 ± 0.1, and use a water bath to keep the temperature at room temperature Oscillating adsorption with an oscillator, after 24 hours, use a magnet to separate the adsorbent from the above wastewater, and use flame atomic absorption spectrophotometry to measure the unadsorbed Cd in the wastewater 2+ , Zn2+ The results are shown in Table 1 below.

[0022] Table 1: Contents of heavy metal ions in wastewater before and after treatment

[0023] heavy metal ions in wastewater

Embodiment 3

[0025] The magnetic nano-hydroxyapatite adsorbent of the present invention that is made in embodiment 1 is added to 20mL containing Cd 2+ and Zn 2+ In the waste water of two kinds of heavy metal ions (the initial concentration of each heavy metal ion in the waste water is shown in Table 2), the consumption of adsorbent is 0.1g / L, adjusts pH value to 5.0 ± 0.1, utilizes water bath constant temperature shaker to carry out at room temperature Oscillating adsorption, after 24 hours, use a magnet to separate the adsorbent from the above wastewater, and use flame atomic absorption spectrophotometry to measure the unadsorbed Cd in the wastewater 2+ , Zn 2+ content. Table 2 lists the use of magnetic nano-hydroxyapatite adsorbent to simultaneously treat Cd-containing 2+ and Zn 2+ The removal effect of wastewater.

[0026] Table 2: Contents of heavy metal ions in wastewater before and after treatment

[0027] heavy metal ions in wastewater

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Abstract

The invention discloses a magnetic nano hydroxyapatite adsorbent, preparation and application thereof. Nano hydroxyapatite Ca10(PO4)6(OH)2 is used as a matrix of the adsorbent, and magnetic powder Fe3O3 is uniformly dispersed in the matrix, wherein the mass ratio of the nano hydroxyapatite to the magnetic powder Fe3O3 is (1.5-1):1. The preparation method comprises the following steps of: dissolving FeCl2 and FeCl3 with a mass ratio of (0.75-0.85):1 in deoxidized water; then adding an ammonia solution and uniformly stirring; simultaneously adding a Ca(NO3)2 solution and a (NH4)2HPO4 solution and uniformly stirring to obtain liliquoid; heating the liliquoid at the temperature of 90-100 DEG C; and then obtaining the magnetic nano hydroxyapatite adsorbent through cooling, separating, washing, drying and grinding. The magnetic nano hydroxyapatite adsorbent has large specific surface area, high adsorption efficiency, low cost and easy separation and can effectively remove heavy metal ions in waste water.

Description

technical field [0001] The invention relates to an inorganic material adsorbent and its preparation and application, in particular to an adsorbent mainly composed of apatite and its preparation and application. Background technique [0002] Heavy metal pollution mainly comes from mining, metallurgy, machining, surface treatment and heavy industry. There are many ways to remove heavy metal ions in water. The traditional methods include chemical precipitation, redox, ferrite, electrolysis, evaporation and concentration, ion exchange resin, etc., but these methods have large investment, high operating cost, and The management is cumbersome, and it is easy to cause secondary pollution and other problems. At the same time, it cannot effectively realize the reuse of heavy metals and water resources. At present, the adsorption method is mostly used in practical applications. The adsorption method has been favored by people because of its cheap and easy-to-obtain materials, low cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28C02F1/62C02F1/64C02F101/20
Inventor 龚继来丰元曾光明牛秋雅牛承岗邓久华晏铭陈耀宁
Owner HUNAN UNIV
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