Application of nano magnesium titanate used as solid-phase extraction adsorption medium in heavy metal ion enrichment

A technology for heavy metal ions and adsorption media, applied in the direction of ion exchange, selective adsorption, ion exchange regeneration, etc., to achieve the effect of large adsorption capacity, low cost, and high enrichment factor

Inactive Publication Date: 2011-10-19
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an important member of the nanomaterial family, nano-magnesium titanate is currently only used to manufacture thermally stable ceramic capacitors and microwave di

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Taking heavy metals lead, cadmium, zinc, copper and nickel as examples to illustrate the application of nano-magnesium titanate in solid phase extraction:

[0018] Prepare 500 mL of a mixed solution containing 5 μg of lead, 1 μg of cadmium, 0.5 μg of zinc, 1.5 μg of copper, and 5 μg of nickel, adjust the pH value to greater than 5, draw it with a syringe, let the solution pass through the column at a flow rate of 10 mL / min, and wash the column with 50 mL of distilled water. Then use 5mL2mol / L nitric acid to elute at a flow rate of 1mL / min, use a test tube to receive the effluent, and use flame atomic absorption to determine the content of lead, cadmium, zinc, copper and nickel, and the calculated recovery rates are all between 95% and 105%. After use, the column was cleaned with 20mL-50mL 2mol / L nitric acid solution, washed with water until nearly neutral, and reused 20 times, and the recovery rate did not decrease significantly.

Embodiment 2

[0020] Analysis of actual water samples

[0021] Take 250 mL of tap water sample, according to the method of Example 1, pass through the column for adsorption at a flow rate of about 10 mL / min, and elute with 5 mL of eluent to determine the content of lead, cadmium, zinc, copper and nickel in the water. The results were 3.53 μg / L for lead, 1.97 μg / L for cadmium, 9.83 μg / L for zinc, 12.62 μg / L for copper and 1.66 μg / L for nickel.

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Abstract

The invention relates to an application of nano magnesium titanate used as a solid-phase extraction adsorption medium in heavy metal ion enrichment, which is characterized by sucking a sample liquid with a syringe, adjusting the pH value to more than 5 with ammonia water, passing through a solid-phase extraction column at a flow rate v not larger than 20 mL/min, washing the column with 50 mL of water, eluting the analyte with 5-10mL of 2 moL/L nitric acid, collecting in a test tube and detecting the content of heavy metal ions in the eluate with an AAS (atomic absorption spectrophotometer) or ICP (inductively coupled plasma) method. The invention uses nano magnesium titanate as a solid-phase extraction adsorption medium to apply in heavy metal ion enrichment, has the advantages of low cost, large adsorption capacity, high enrichment factor, stable enrichment performance, good strong acid, strong base and organic solvent resistance, good high-temperature resistance and reusability, and can simultaneously enrich Pb, Cd, Zn, Cu, Ni and other heavy metal ions.

Description

technical field [0001] The invention relates to a new application of nano-magnesium titanate, in particular to the application of nano-magnesium titanate in heavy metal enrichment, and belongs to the field of pre-enrichment of trace substances in analytical chemistry and environmental monitoring. Background technique [0002] With the rapid development of modern industry, a large amount of pollutants enter the environment, causing serious environmental problems. Among the many pollutions, heavy metal pollution is one of the most serious pollutions. Heavy metals are not only highly toxic, but also concealed, irreversible and long-term. They can accumulate in organisms and amplify their toxicity through bioaccumulation in the food chain. All countries in the world have made strict regulations on the content of heavy metals in water and food. At present, the determination of heavy metals mainly uses atomic absorption method, spectrophotometry and ICP method. Although the sens...

Claims

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Application Information

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IPC IPC(8): B01D15/08B01J20/281C01G23/00
Inventor 张东徐风
Owner SHENYANG LIGONG UNIV
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