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A Simultaneous Rapid Adsorption of Heavy Metal Ions of Chromium, Cadmium and Lead

A fast technology for heavy metal ions, applied in chemical instruments and methods, alkali metal compounds, adsorbed water/sewage treatment, etc., can solve the problems affecting the removal speed and efficiency of heavy metal ions, difficult separation of adsorbents, and inability to simultaneously adsorb, etc. Achieve the effect of easy separation and removal, fast adsorption speed and easy control

Active Publication Date: 2021-07-02
INST OF AGRI PROD QUALITY SAFETY & STANDARD JIANGXI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many adsorbents are difficult to separate after use, have poor stability, and slow adsorption speed, which affects the removal speed and removal efficiency of heavy metal ions, and may also cause secondary pollution to the environment, and cannot simultaneously adsorb Cr(III), Cd(II), Pb(II) three heavy metal ions

Method used

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  • A Simultaneous Rapid Adsorption of Heavy Metal Ions of Chromium, Cadmium and Lead
  • A Simultaneous Rapid Adsorption of Heavy Metal Ions of Chromium, Cadmium and Lead
  • A Simultaneous Rapid Adsorption of Heavy Metal Ions of Chromium, Cadmium and Lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for rapidly adsorbing Cr(III), Cd(II), and Pb(II) at the same time, the specific steps are as follows:

[0030] (1) Put 0.93 g FeCl 3 ·6H 2 O and 0.48 g FeSO 4 ·7H 2O was dissolved in 125 mL of aqueous solution to form a mixed solution. Under nitrogen protection, GO (0.1 g) suspension was slowly added and heated to 80 °C. To generate Fe 3 O 4 granules, quickly add 70 mL of ammonia solution to the above mixed solution, the temperature rises to 85 °C, continue to add ammonia solution, when the pH of the above mixed solution reaches 10, stop adding, and continue to stir for 45 min to generate Fe 3 O 4 / GO complex. Then use 1.0 M HCl to adjust the pH to about 7, mix 0.25 g PVP and 1.5 mL hydrazine hydrate first, and then add the above Fe together 3 O 4 In the / GO composite, after mixing, stirring was continued for 4 h. After the reaction, use a magnet to separate, ethanol / H 2 O wash 3 times to get PVP / Fe 3 O 4 / GO complex, dry for later use.

[0031...

Embodiment 2

[0035] The reusable experiment of the method of rapidly adsorbing Cr(III), Cd(II) and Pb(II) at the same time, the specific steps are as follows:

[0036] (1) Under the same experimental conditions as Example 1, add 200 µL of 1000 mg / L Cr(III) ions to 10 mL of 0.2 mg / mL PVP / Fe 3 O 4 / GO solution, shake well at room temperature and shake for 10 min, use an external magnet to separate, take 5.0 mL of supernatant liquid for detection by flame atomic absorption spectrometer, discard the remaining supernatant liquid, and wash the precipitate with secondary water 2 times, after magnet separation, discard the supernatant and add 5.0 mL of 5% HNO 3 After ultrasonic desorption for 10 min, the magnet was used for separation, and the precipitate was washed twice with secondary water. After magnet separation, the supernatant was discarded, the precipitate was redispersed in 10 mL of secondary water, and 200 µL of 1000 mg / L Cr(III) was added. ) ions, repeat the above operation 5 times. ...

Embodiment 3

[0041] The application experiment of a method for simultaneous rapid adsorption of Cr(III), Cd(II), and Pb(II) in complex soil samples, the specific steps are as follows:

[0042] Weigh 0.1 g of each of the three soil samples, add 2.0 mL of concentrated HNO 3 , heated at 100 °C for 60 min to dissolve heavy metal ions in soil samples. Then, the pH was adjusted to about 7 with NaOH, and 0.2 mg / mL of PVP / Fe was added. 3 O 4 / GO solution to 35 mL, shake well at room temperature and shake for 10 min, use an external magnet to separate, discard the supernatant, and add 10 mL of 5% HNO 3 After ultrasonic desorption for 10 min, a magnet was used for separation, and 5.0 mL of the supernatant was taken, and the concentrations of Cr(III), Cd(II), and Pb(II) were detected by flame atomic absorption spectrometer.

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Abstract

The present invention is a method for quickly adsorbing chromium, cadmium and lead heavy metal ions at the same time, using Fe modified by polyvinylpyrrolidone 3 o 4 Embedded graphene oxide as a chromium, cadmium and lead heavy metal ion adsorbent, specifically containing PVP / Fe 3 o 4 / GO composite preparation, adsorption and desorption of chromium, cadmium and lead heavy metal ions in three steps. PVP / Fe 3 o 4 The adsorption time of chromium, cadmium and lead ions by the / GO composite was short, and the maximum adsorption capacity reached 13.82 mg / g, 30.52 mg / g, and 555.56 mg / g, respectively. PVP / Fe 3 o 4 / GO complex in 5% HNO 3 It shows high stability in solution, and it still has good adsorption performance after repeated use for 5 times, and it is easy to separate and remove, and will not cause serious secondary pollution to the environment. The method of the present invention has been successfully applied to the adsorption of chromium, cadmium and lead ions in complex soils, and its adsorption efficiency has reached more than 90%. Treatment of chromium, cadmium and lead ions.

Description

technical field [0001] The invention relates to a method for simultaneously rapidly adsorbing heavy metal ions of chromium, cadmium and lead, and specifically belongs to the technical field of inorganic chemical analysis. Background technique [0002] Heavy metal ions have no degradation characteristics in water and soil due to their long half-life, especially Cr(III), Cd(II), and Pb(II), which easily cause serious food and environmental pollution. Through the enrichment of animals and plants and the enlargement of the food chain, it will also bring serious threats to human health, such as kidney damage, emphysema, nervous system damage, hypertension and other diseases. Therefore, there is an urgent need for an effective method to adsorb and remove heavy metal ions in water and soil, and reduce the residual heavy metal ions. At present, a large number of methods have been reported for the adsorption and removal of heavy metal ions, such as filtration, sedimentation, biologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28B09C1/00C02F101/20C02F101/22
CPCB01J20/261B01J20/28009B09C1/00C02F1/288C02F2101/20C02F2101/22C02F2303/16
Inventor 邱素艳魏益华袁丽娟张大文罗林广涂田华陈庆隆
Owner INST OF AGRI PROD QUALITY SAFETY & STANDARD JIANGXI ACAD OF AGRI SCI
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