Method for adsorbing six heavy metals in water environment based on magnetic graphene oxide

A graphene and heavy metal adsorption technology, applied in the field of environmental protection and nanomaterials, can solve the problems of low adsorption rate and slow treatment time of heavy metal wastewater, and achieve the effect of improving purity, simple method and saving materials

Inactive Publication Date: 2018-04-17
NANJING UNIV OF FINANCE & ECONOMICS +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a method for the adsorption of total heavy metals in the water environment based on magnetic graphene oxide, which can be applied to the pretreatment of heavy metals in sewage, and overcome the problems of slow treatment time and low adsorption rate of traditional heavy metal wastewater

Method used

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  • Method for adsorbing six heavy metals in water environment based on magnetic graphene oxide
  • Method for adsorbing six heavy metals in water environment based on magnetic graphene oxide
  • Method for adsorbing six heavy metals in water environment based on magnetic graphene oxide

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Embodiment 1

[0026] Synthesis of graphene oxide: In an ice bath, 1.0g of graphite powder, 2.5g of NaNO 3 and 100 mL of concentrated H 2 SO 4 Mix in beaker for 30min. Slowly add 3g of KMnO 4 , the temperature was gradually raised to 35°C and stirred for 4h, then gradually raised to 60°C and stirred for 2h. Then the above mixture was added into ultrapure water, stirred at 98 °C for 1 h, and 10 mL of 30% H 2 o 2 , the color of the mixture changed to bright yellow and was filtered. Wash with 5% HCl to remove heavy metals, wash with ultrapure water to remove excess acid, and finally ultrasonically disperse in water and freeze-dry for 24 hours.

[0027] The synthesis process of magnetic graphene oxide:

[0028] Weigh 1.736g of NH 4 Fe(SO 4 ) 2 12H 2 O, 0.784g (NH 4 ) 2 Fe(SO 4 ) 2 ·6H2 O, in N 2 Under the protection condition of , add it into 100mL of ultrapure water, stir evenly with magnetic force, and the temperature is 70°C. Use 1M NH 4 OH to adjust the pH value to 3, and t...

Embodiment 2

[0030] Example 2 Using the magnetic graphene oxide prepared in Example 1 to adsorb heavy metal ions

[0031] Using NaOH and HNO 3 Regulated to contain heavy metal Cr 6+ 、Cd 2+ , Pb 2+ 、Cu 2+ 、As 5+ , Hg 2+ To determine the pH value of the solution, weigh the magnetic graphene oxide and add it to the solution, oscillate evenly and time it, take it out after a period of time, and use inductively coupled plasma mass spectrometry (ICP-MS) to measure the content of six heavy metals.

[0032] Optimization of adsorption process time: configure 100mL containing about 40ng / mL Cr 6+ 、Cd 2+ , Pb 2+ 、Cu 2+ 、As 5+ , Hg 2+ For the mixed solution of heavy metal ions, take out 5mL before adsorption, and wait for the test. Take 24mg of magnetic graphene oxide and add it to the mixed solution of heavy metal ions, and shake it. The adsorption time is 2, 5, 10, 15, 20, 30, 50min, take out 5mL, and pass through a microporous membrane with a pore size of 0.22μm. The concentration of th...

Embodiment 3

[0037] Elution of heavy metals on magnetic graphene oxide by 0.02M HCl in different time periods: six 40mL solutions with a pH value of 6-7 were prepared, containing about 50ng / mL of Cr 6+ 、Cd 2+ , Pb 2+ 、Cu 2+ 、As 5+ , Hg 2+ heavy metal. Take out 5mL before adsorption, to be tested; weigh 10mg of magnetic graphene oxide and add them to the mixed solution, vortex for 10min, use a magnet to separate, pour out to be tested; add 1mL of 0.02M HCl eluent, and the oscillation time is respectively 5, 15, 30, 60, 120min, take out the measured concentration, and calculate the elution rate. Effect of 0.02M HCl on Cd on magnetic graphene oxide at different times 2+ Changes in elution rate as Figure 5 shown.

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Abstract

The invention discloses a method for adsorbing six heavy metals in a water environment based on magnetic graphene oxide. The magnetic graphene oxide is taken as an adsorbent and is added into a mixedwater solution of Cr<6+>, Cd<2+>, Pb<2+>, Cu<2+>, As<5+> and Hg<2+>, the pH value is adjusted, the vibration is carried out for 2-50 minutes, unabsorbed and absorbed solutions are obtained by virtue of a magnetic solid phase adsorption method, the concentrations of six heavy metals are determined by virtue of ICP-MS, and the fastest time and optimal pH value for reaching the balance are determined.

Description

technical field [0001] The invention discloses a magnetic graphene oxide, and its application in the water environment to the heavy metal Cr 6+ 、Cd 2+ , Pb 2+ 、Cu 2+ 、As 5+ , Hg 2+ The adsorption is a method for purifying a water environment based on a magnetic graphene oxide adsorption material, and belongs to the technical fields of nanomaterials and environmental protection. Background technique [0002] Due to the characteristics of high toxicity and enrichment of heavy metals through the food chain, the management of heavy metals has received great attention from the state in recent years. [0003] At present, there are many heavy metal wastewater treatment methods that have been developed and applied. The traditional methods include precipitation, filtration, ion exchange, membrane separation and adsorption. Among these methods, the adsorption method is to use an adsorbent to adsorb heavy metal ions on the surface of heavy metals, thereby removing heavy metal pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F9/12C02F101/20C02F101/22
CPCB01J20/20B01J20/28009C02F1/283C02F1/444C02F1/48C02F1/66C02F9/00C02F2101/20C02F2101/22
Inventor 邢常瑞孙梦璐袁建靳雪雪柳家鹏
Owner NANJING UNIV OF FINANCE & ECONOMICS
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