Method for purifying carbon nanotube polluted water body

A carbon nanotube and water technology, which is applied in the fields of nanotechnology and environmental protection, and achieves the effects of easy elution and simple method

Inactive Publication Date: 2010-11-17
SHANGHAI UNIV
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  • Description
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  • Application Information

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However, there is currently no effective method f

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  • Method for purifying carbon nanotube polluted water body
  • Method for purifying carbon nanotube polluted water body
  • Method for purifying carbon nanotube polluted water body

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Embodiment 1

[0019] Removal of carbon nanotubes in water: 1.0mL-3.0mL of CaCl with a concentration of 2mg / mL and a pH value of 6.0 2 The aqueous solution is added to 1.0mL-3.0mL carbon nanotube aqueous solution with a concentration of 1.0mg / mL and a pH value of 6.0. After settling at room temperature for 1 hour, filter with filter paper. The removal rate of carbon nanotubes can be obtained by measuring the absorbance of the filtrate at 600 nm with a microplate reader. The filtrate is colorless, clear and transparent, indicating that the removal rate is very high ( figure 1 ).

Embodiment 2

[0021] Removal of carbon nanotubes at different pH and ionic strength: 1.0 mL of CaCl with a concentration of 2 mg / mL and a pH value of 6.0 2 The aqueous solution was added to 1.0 mL of carbon nanotube aqueous solutions with a concentration of 1.0 mg / mL and different pH values. After settling at room temperature for 1 hour, filter with filter paper. The absorbance value of the filtrate at 600 nm was measured by a microplate reader, which was used to calculate the removal rate. The filtrate is colorless, clear and transparent.

[0022] 1.0 mL of CaCl with a concentration of 2 mg / mL and a pH of 6.0 2 The aqueous solution was added to 1.0 mL of carbon nanotube aqueous solutions with a concentration of 1.0 mg / mL, a pH value of 6.0, and different ionic strengths. After settling at room temperature for 1 hour, filter with filter paper. The absorbance value of the filtrate at 600 nm was measured by a microplate reader, which was used to calculate the removal rate. The filtrate w...

Embodiment 3

[0025] Removal of carbon nanotubes in the presence of surfactants and natural organic matter: 1.0 mL of CaCl with a concentration of 2 mg / mL and a pH value of 6.0 2 The aqueous solution was added to 1.0 mL of carbon nanotube aqueous solutions with a concentration of 1.0 mg / mL, a pH value of 6.0, and different concentrations of surfactants (or natural organic matter). After settling at room temperature for 1 hour, filter with filter paper. The absorbance value of the filtrate at 600 nm was measured by a microplate reader, which was used to calculate the removal rate. The filtrate is colorless, clear and transparent. Present embodiment illustrates that there is surfactant and natural organic matter in the polluted system and basically influences the effect of this method ( image 3 ).

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Abstract

The invention relates to a method for settling, filtering and removing carbon nanotubes by using calcium ions, is suitable for treating a water body polluted by the carbon nanotubes and belongs to the field of nanotechnology and environmental protection technology. The method comprises a step of: agglomerating carbon nanotubes by adding calcium chloride into carbon nanotube solution so as to remove the carbon nanotubes in the water body by a filtering method. When the calcium ions have a concentration of 0.001mol/L, the clearance rate of the carbon nanotubes is higher than 99 percent; a residual amount is less than 5 mu g/ml; and water solution is colourless and transparent. Under the conditions of different acid and alkaline degrees and ion strengths, the method also can effectively eliminate the carbon nanotubes. Under the presence of a surface active agent and a natural organic matter, the same excellent elimination effect also can be achieved by improving the additive amount of the calcium chloride moderately. The concentration of the calcium ions used for elimination is lower, and purified water is moderately hard water and can be discharged directly without softening treatment.

Description

technical field [0001] The invention develops a method for sedimentation and filtration to remove carbon nanotubes through calcium ions gathering carbon nanotubes, is suitable for treating water bodies polluted by carbon nanotubes, and belongs to the technical field of nanotechnology and environmental protection. Background technique [0002] Since they were first discovered in 1991, carbon nanotubes have attracted the attention of many researchers at home and abroad because of their excellent properties in terms of physical and chemical properties. The huge application potential of carbon nanotubes makes its synthesis and preparation scale continue to expand. Nobel laureate Dr. Smalley once predicted that within a few years, the world's annual production of carbon nanotubes will reach millions of tons. At the same time, the biological safety of carbon nanotubes has also been widely studied, including the toxicity of bacteria, cells, animals, plants and the environment. St...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 王海芳董二亚杨胜韬常艳丽王云霞王艳雯聂海瑜
Owner SHANGHAI UNIV
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