Phosphate material for efficiently and selectively removing lead ions and application thereof

A lead ion, selective technology, applied in the field of removal of heavy metal ions in solution, to achieve the effect of small particle size, high purity, and many reactive sites

Inactive Publication Date: 2012-01-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ca 10 (PO 4 ) 6 (OH) (Environ.Sci.Technol.1994, 28, 1219-1228), BaHAp (Colloids and Surfaces A: Physicochemical and Engineering Aspects 169 (2000) 17-26) and Sr 10 (PO 4 ) 6 Phosphate materials such as (OH) (J.Chem.Soc., Faraday Trans., 1996, 92(21), 4305-4310) also show selective removal of lead ions and good ion exchange effect, But its optimal removal performance is subject to temperature and solution pH to a certain extent, and its ion exchange atomic ratio (such as Pb / Sr=0.507, Pb / Ca=0.113, Pb / Ba=0.137) and its to lead ion Selectivity [such as the adsorption amount of lead ions is 1-4 times that of other metal ions (such as Cu, Zn, Cd, Co)] needs to be further improved

Method used

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  • Phosphate material for efficiently and selectively removing lead ions and application thereof
  • Phosphate material for efficiently and selectively removing lead ions and application thereof
  • Phosphate material for efficiently and selectively removing lead ions and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055](1) Dissolve 1.07g of strontium nitrate in 50mL of deionized water, add 0.036g of hexadecyltrimethylammonium bromide, stir thoroughly for 30min to disperse evenly, and adjust the pH with 0.01mol / L dilute nitric acid = 5. Get a solution.

[0056] (2) 0.823g of sodium phosphate is uniformly dissolved in 50mL of deionized water to obtain a phosphate-containing soluble saline solution, and the phosphate-containing soluble saline solution is added dropwise to the solution obtained in step (1), and placed in a high-pressure reaction Reaction in the tank at 120°C for 24 hours, the reaction product was filtered through a suction filter and then filtered through filter paper, then washed with alcohol for 3 times and then washed with water for 3 times, and dried in vacuum at 60°C for 6 hours to obtain a white phosphate material. Its scanning electron microscope image is figure 1 As shown, it is a long rod-shaped Sr with a diameter of 50-100 nm and a length of 0.5-2 microns. 5 (P...

Embodiment 2

[0058] (1) Dissolve 2 g of strontium nitrate in 100 mL of deionized water, add 0.5 g of sodium dodecylbenzene sulfonate, stir thoroughly for 30 min to disperse it evenly, adjust pH=1 with 0.1 mol / L dilute nitric acid, and obtain solution.

[0059] (2) Dissolve 2 g of sodium dihydrogen phosphate evenly in 50 mL of deionized water to obtain a phosphate-containing soluble saline solution, and add the phosphate-containing soluble saline solution dropwise to the solution obtained in step (1), at 20° C. React for 24 hours, the reaction product is filtered through a suction filter and then filtered through filter paper, then washed with alcohol for 3 times, then washed with water for 3 times, and dried in vacuum at 50°C for 18 hours to obtain a white phosphate material with a diameter of 20-70nm , short rod-shaped SrHPO with a length of 100-50 nm 4 , the X-ray diffraction spectrum of the phosphate material is shown as Figure 4 shown.

Embodiment 3

[0061] (1) Dissolve 2.61g of barium nitrate in 100mL of deionized water, add 1.5g of hexadecyltrimethylammonium bromide, stir thoroughly for 30min to disperse evenly, adjust the pH with 0.01mol / L dilute nitric acid = 5. Get a solution.

[0062] (2) Dissolve 10 g of sodium phosphate evenly in 100 mL of deionized water to obtain a phosphate-containing soluble saline solution, add the phosphate-containing soluble saline solution dropwise to the solution obtained in step (1), and place in a high-pressure reaction tank Reaction at 180°C for 8 hours, the reaction product was filtered by a suction filter, filtered through filter paper, washed with alcohol for 3 times, washed with water for 4 times, and dried in vacuum at 40°C for 24 hours to obtain a white phosphate material. Microscope picture as figure 2 As shown, it is flaky Ba with a thickness of 10-50nm and a diameter of 1-2 microns 3 (PO 4 ) 2 (abbreviation BP); The X-ray diffraction spectrogram of this phosphate material ...

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Abstract

The invention discloses a phosphate material for efficiently and selectively removing lead ions from a solution. The material contains strontium and / or barium ions capable of making an exchange with the lead ions; and lead phosphate substances with better stability are generated after the exchange to realize the effect of fixing the lead ions. The material has a saturated extent of adsorption for the lead ions in the solution, which is obviously higher than that in the existing report; and in the presence of interfering ions, such as zinc ions, copper ions, arsenic ions, chromium ions, iron ions and cadmium ions, the selectivity is effective even for removing the lead ions at a very low concentration. In addition, the performance for removing the lead is a little affected by the temperature and the pH of the solution; and the phosphate material which is convenient in operation and strong in practicability is a novel and excellent material for selectively removing the lead ions.

Description

technical field [0001] The invention relates to the field of removing heavy metal ions in solution, in particular to a highly efficient phosphate material capable of selective ion exchange with lead ions. Background technique [0002] It is a known technology in the technical field of heavy metal ion removal to remove lead ions in solution by ion exchange. At present, there have been some reports of using phosphate-containing natural materials to remove lead ions, such as fluoroapatite (publication number is the Chinese patent application of CN1201719A), aluminum sulfate modified kaolin (publication number is CN101543767A) Chinese patent application), natural phosphate (Hydrometallurgy 81(2006) 219-225, Journal of Hazardous Materials B119(2005) 183-188, Environmental Pollution 131(2004) 435-444), etc. These materials are cheap and readily available, and can remove lead ions at an optimal pH and temperature. However, these materials are mainly natural materials. Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/12B01D15/04
Inventor 宋伟杰张帆杨晔谭瑞琴郭艳群兰品军黄琦金
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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