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Method for removing heavy metal ions in sewage by nanometer hydroxylapatite

A nano-hydroxyapatite, heavy metal ion technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem of heavy metal removal efficiency that has not been reported, and achieve strong on-site operability , the effect of small environmental risk and high governance efficiency

Inactive Publication Date: 2009-12-30
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the increasingly serious environmental pollution, the research on natural hydroxyapatite remediation in heavy metal-polluted environment is attracting more and more attention, such as the use of hydroxyapatite-containing bone carbon powder for in situ lead removal in soil and sediments. Fixed studies have been reported (S-B.Chen et al., Environmental Pollution, 2006, 139 (3), 433-439; Chen Shibao et al., Environmental Chemistry 2006, 25 (4); 409-413; Hodson, M.E., etc., Environ.Sci .Technol.34,3501-3507; Chinese patent, application number 200810117375.0), but the research on the removal efficiency of heavy metals in heavy metal sewage by using nano-sized hydroxyapatite has not been reported yet

Method used

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  • Method for removing heavy metal ions in sewage by nanometer hydroxylapatite
  • Method for removing heavy metal ions in sewage by nanometer hydroxylapatite
  • Method for removing heavy metal ions in sewage by nanometer hydroxylapatite

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Using the above mother liquor, sequentially prepare Cd(NO 3 ) 2 solution, Pb(NO 3 ) 2 solution and Cu(NO 3 ) 2 solution, and then take 30mL of each solution and add them to the 50mL plastic centrifuge tube containing 0.20g of the above-mentioned nano-hydroxyphosphate rock powder, wherein, 0.05mol / L KNO 3 As a supporting electrolyte, 0.05M HNO 3 / KOH to adjust the pH of the solution. Each treatment was repeated 3 times. Cover and seal the centrifuge tube with the sample added, shake at a constant temperature at 25°C for 24 hours, then stand still and centrifuge (4000r·min -1 ) for 15 minutes, filter, and measure the concentration of Cd in the solution after equilibrium with atomic absorption spectrophotometry (AAS / FAAS) method, Pb, Cu ions. According to the concentration difference of Cd, Pb and Cu ions in the initial solution and the equilibrium solution, calculate the removal rate R of hydroxyphosphate powder for Cd, Pb and Cu ions (see Equation 1):

[0024] ...

Embodiment 2

[0038] Preparation of Cd(NO 3 ) 2 , Pb(NO 3 ) 2 and Cu(NO 3 )2 The mixed aqueous solution, wherein Cd, Pb, Cu ion concentration is 40mg / L, pH is 6, gets this mixed solution 30mL and joins respectively in the 50mL plastic centrifuge tube that contains 0.18g and 0.24g above-mentioned nano-hydroxyphosphate rock powder, wherein , with 0.05mol / L KNO 3 As a supporting electrolyte, 0.05M HNO 3 / KOH to adjust the pH of the solution. Each treatment was repeated 3 times. Cover and seal the centrifuge tube with the sample added, shake at a constant temperature at 27°C for 16 hours, rest, centrifuge (4000r / min) for 15 minutes, filter, and measure the balance by atomic absorption spectrophotometry (AAS / FAAS) The concentration of Cd, Pb, Cu ions in the solution. The calculation of removal rate is with embodiment 1. The results show that when the amount of nano-hydroxyphosphate rock powder is 6g / L, the removal rate of heavy metal ions Pb in the above mixed solution is 85.4%, the rem...

Embodiment 3

[0040] Cd(NO 3 ) 2 Aqueous solution, pH is 6.5, take 30mL of this solution and join in the 50mL plastic centrifuge tube containing 0.21g above-mentioned nano-hydroxyphosphate rock powder, wherein, with 0.05mol / LKNO 3 As a supporting electrolyte, 0.05M HNO 3 / KOH to adjust the pH of the solution. Each treatment was repeated 3 times. Cover and seal the centrifuge tube with the sample added, shake at a constant temperature at 23°C for 48 hours, then rest, centrifuge (4000r / min) for 15 minutes, filter, and measure the balance by atomic absorption spectrophotometry (AAS / FAAS) The concentration of Cd ions in the solution. The calculation of removal rate is with embodiment 1. The removal rate reaches 92%.

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Abstract

The invention discloses a method for removing heavy metal ions in sewage by nanometer hydroxylapatite, belonging to the technical field of heavy metal sewage treatment. The method comprises the following steps: adding nanometer grade hydroxylapatite powder in waste water containing heavy metal ions, wherein, the dosage of the hydroxylapatite powder is 6-8g / L; balancing the mixture for 12-48 hours at a temperature of 23-27 DEG C; and standing the mixture to remove the heavy metal ions in the waste water. The method uses the hydroxylapatite with relatively lower economic value to treat the heavy metal sewage, has high treatment efficiency, low treatment cost, strong field operability and small environment risk, and has heavy metal ion removal rate over 90 percent under conditions that concentration of Cd, Pb or Cu ions does not exceed 60mg / L.

Description

technical field [0001] The invention belongs to the technical field of heavy metal sewage treatment, and in particular relates to a method for removing heavy metal ions in sewage by using nano-hydroxyapatite. Background technique [0002] In recent years, with the rapid development of my country's mining, metallurgy, machinery manufacturing, chemical industry and other industries, a large amount of heavy metal wastewater is produced every year, and some wastewater is discharged into water bodies without treatment or treatment is not up to standard, causing the accumulation of heavy metals in soil and water. Cause serious pollution of water environment. In some arid and semi-arid areas of China, the sewage used for agricultural irrigation contains excessive heavy metals, causing heavy metal pollution to the local soil-plant system, and thus seriously threatening human health. How to effectively control heavy metal environmental pollution has become one of the hot spots in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62C02F101/20
Inventor 陈世宝马义兵韦东普
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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