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Carbon material for heavy metal adsorption as well as preparation method and application thereof

A technology for carbon materials and heavy metals, which is applied in the field of carbon materials adsorbed by heavy metals and its preparation, can solve problems such as large consumption of flocculants, and achieve the effects of reducing adsorption costs and improving adsorption rates.

Pending Publication Date: 2020-03-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires additional consumption of a large amount of flocculant

Method used

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  • Carbon material for heavy metal adsorption as well as preparation method and application thereof
  • Carbon material for heavy metal adsorption as well as preparation method and application thereof
  • Carbon material for heavy metal adsorption as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 250mL of concentrated sulfuric acid to 2g of natural flake graphite carbon material. After stirring evenly, add 8g of potassium permanganate in four days. On the fifth day, add 0.5L of ice to the solution to quench it. After cooling, add 30% hydrogen peroxide dropwise to the solution. Turn into bright yellow, centrifuge after stirring for 20 minutes, wash with distilled water-hydrochloric acid-distilled water until the pH remains unchanged.

[0032] The oxidized natural flake graphite carbon material GO was prepared for use.

Embodiment 2

[0034] Take 8.6g of oxidized natural flake graphite carbon material, 4.9g of phosphorous acid and 10mL of phosphorus trichloride, stir, heat and mix, then cool, add 50mL of water after cooling, heat to 65°C and reflux for 48h, collect the solid by suction filtration, add 100mL of water and heat to 75°C Reflux at ℃ for 1h, cool to 45℃ and filter while hot, collect the solid and wash until the pH remains unchanged.

[0035] In the prepared phosphorylated and oxidized natural flake graphite carbon material, the content of phosphorus element is 6.24wt%.

[0036] Characterization of phosphorylated and oxidized natural flake graphitic carbon materials. Fourier transform infrared spectrum shows: at 1085cm -1 The peak of P=O appeared at the position. It shows that there are phosphorus-containing groups on the surface of oxidized natural flake graphite. From the XPS spectrum, there is an obvious 2P peak of phosphorus at the position of 134.9. And the percentage of phosphorus elemen...

Embodiment 3

[0038] Take two groups of Cd with a concentration of 50ppm 2+ 、Cr 3+ 、Ni 2+ , Pb 2+ 15g of a single heavy metal ion solution was added with 0.2g of GO and GOBPS respectively, and the GO group was used as a comparison group, and stirred and left for 30 minutes to obtain a treated aqueous solution. The concentration of ions before and after treatment was detected by atomic absorption spectrometry.

[0039] Another set of comparative experiments is TMT-15, a common heavy metal flocculant on the market. Take TMT-152g (high efficiency ratio) and add it to 100g 50ppm single heavy metal ion solution, adjust the pH of the solution at 2-4, and measure the ion concentration after aging. Concentration, and then calculate the removal efficiency.

[0040] In addition, the adsorption efficiency q e (%) is derived according to the following formula:

[0041] q e =(C 0 -Ce) / C 0 ×100%

[0042] Among them, C represents the ion concentration, the unit is mg / L.

[0043] The treated aqu...

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Abstract

The invention provides a carbon material for heavy metal adsorption and a preparation method and application thereof. By grafting an oxygen-containing group on a carbon material and combining the oxygen-containing group with a phosphorus-containing group, more than 90% of heavy metal ions can be removed in an acidic environment without adjusting the pH value. The method comprises the following steps of oxidizing the carbon material: adding concentrated sulfuric acid into the carbon material, stirring and adding potassium permanganate, adding ice into the solution for quenching, cooling, dropwise adding hydrogen peroxide until the solution becomes bright yellow, stirring, centrifuging, and washing until the pH value is not changed to obtain the carbon oxide material, and performing the phosphorylation of the carbon oxide material: taking the carbon oxide material, phosphorous acid and phosphorus trichloride, stirring, heating, mixing, cooling, adding water after cooling, heating to a certain temperature, refluxing for a certain time, carrying out suction filtration, collecting solids, adding water, heating to a certain temperature, refluxing for a certain time, cooling to a certaintemperature, filtering while the solids are hot, collecting the solids, and washing until the pH value is not changed to obtain a phosphorylated carbon oxide material.

Description

technical field [0001] The invention belongs to the field of heavy metal adsorption, and relates to a carbon material used for heavy metal adsorption, a preparation method and application thereof. Background technique [0002] Heavy metal refers to the density greater than 5g / cm 3 The heavy metal pollutants that have a greater impact on the ecological environment mainly include zinc, copper, chromium, cadmium, lead, manganese, nickel, mercury, arsenic, etc. Heavy metal pollution mainly comes from electroplating, electronics, mining, smelting, chemical industry, electric power and other industries, as well as domestic solid waste. Heavy metals discharged into environmental media can neither be biodegraded nor destroyed, but also have a bioaccumulation effect, thus posing a major threat to organisms and human health. How to recover from the source and remove heavy metals from environmental media has become an important issue. [0003] Chemical precipitation and coagulation-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/0262B01J20/20B01J20/28009C02F1/281C02F1/283C02F2101/20
Inventor 游志雄李梦韦
Owner WUHAN UNIV
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