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Method for removing trace polycyclic aromatic hydrocarbon from water through quick adsorption

A technology for polycyclic aromatic hydrocarbons and water removal, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as poor performance of organic matter, and achieve strong adsorption capacity, mild conditions, and simple operation Effect

Inactive Publication Date: 2011-06-29
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bentonite is cheap and easy to obtain, but due to the strong hydrophilicity of its surface silicon-oxygen structure and the hydrolysis of interlayer cations, the performance of bentonite to adsorb organic matter in water is poor

Method used

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  • Method for removing trace polycyclic aromatic hydrocarbon from water through quick adsorption
  • Method for removing trace polycyclic aromatic hydrocarbon from water through quick adsorption
  • Method for removing trace polycyclic aromatic hydrocarbon from water through quick adsorption

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preparation example Construction

[0032] The preparation steps of electrospun nanofiber membrane include:

[0033] 1) Dissolve polylactic acid-caprolactone co(P(LA / CL), 7 / 3) particles with a molecular weight of 100,000 in dichloromethane, and add block copolymer surfactants to optimize spinning performance. After uniformly mixing, stirring for 2 hours to obtain a mixed gel, wherein the amount of block copolymer F108 is 17% of the weight of polylactic acid-caprolactone (P(LA / CL), 7 / 3);

[0034] 2) The high-voltage electrostatic spinning equipment is composed of a DC high-voltage power supply, a spinneret and a receiving device. The mixed gel obtained in step 1) is introduced into a high-voltage electrostatic spinning device, the power supply voltage is adjusted to 10 kV, and the receiving distance is 15 cm to obtain a stable and continuous jet. Irradiate with infrared light during the whole spinning process to make methylene chloride completely volatilize;

[0035] 3) Collect the electrospun fiber membrane on the al...

Embodiment 1

[0046] 1.2 grams of polylactic acid-caprolactone (P(LA / CL), 7 / 3) was dissolved in 20 grams of dichloromethane, and then 0.2 grams of block copolymer surfactant F108 was added, mixed evenly and stirred for 2 hours to obtain the mixture gel. Then the mixed gel is introduced into the high-voltage electrostatic spinning device to be spun. The high-voltage power supply voltage is adjusted to 10 kV and the receiving distance is 15 cm to obtain a stable and continuous jet flow, and the fiber products are collected on the receiving plate covered with aluminum foil paper. In the whole spinning process, infrared lamp is used to evaporate the methylene chloride completely. After 4 to 5 hours, when the thickness of the fiber membrane reaches 0.3-0.5 mm, the spinning is stopped to obtain a polylactic acid-caprolactone (P(LA / CL), 7 / 3) electrospun nanofiber membrane. The polylactic acid-caprolactone (P(LA / CL), 7 / 3) electrospun nanofiber membrane was subjected to fiber morphology characteriz...

Embodiment 2

[0049] The preparation steps of the electrospun nanofiber membrane are the same as in Example 1.

[0050] The obtained polylactic acid-caprolactone (P(LA / CL), 7 / 3) electrospun nanofiber membrane was cut into small squares of 1.5 cm×1.5 cm and peeled off from the aluminum foil. Then weigh 0.1 g (about 5 pieces) of electrospun nanofiber membrane and add it to 50 ml of 7 polycyclic aromatic hydrocarbon mixed solutions with a concentration of 3 μg / L; and place the mixed system at 30°C and 120 revolutions / min. After 20 minutes of reaction, samples were taken and measured by high performance liquid chromatography (DIONEX U3000, USA). The adsorption removal rate of 7 kinds of polycyclic aromatic hydrocarbons by this method were: acenaphthene 82.4%, fluorene 82.6%, phenanthrene 85.5%, Anthracene 88.6%, fluoranthene 85.6%, pyrene 84.4%, and benzo[a]anthracene 84.9%.

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Abstract

The invention belongs to the field of sewage treatment, in particular relates to a method for removing trace polycyclic aromatic hydrocarbon from water by utilizing the quick adsorption of a polylactic acid-caprolactone (P(LA / CL),7 / 3) electrospinning nanofiber membrane, which comprises the two steps of preparing the electrospinning nanofiber membrane and removing the trace polycyclic aromatic hydrocarbon from the water by utilizing the adsorption of the electrospinning nanofiber membrane, namely preparing the electrospinning nanofiber membrane with excellent adsorption performance from biodegradable polylactic acid-caprolactone (P(LA / CL),7 / 3) serving as a raw material by electrospinning technology, wherein the ratio of polylactic acid to the polycaprolactone during synthesis is 7:3; and reacting the electrospinning nanofiber membrane with mixed solution of polycyclic aromatic hydrocarbon at different concentrations to remove the polycyclic aromatic hydrocarbon from the water through adsorption. Through the method for removing the trace polycyclic aromatic hydrocarbon from the water through quick and efficient adsorption provided by the invention, over 80 percent of polycyclic aromatic hydrocarbon (the concentration range is between 1 and 10 micrograms / liter) can be removed from the water within 20 minutes through adsorption, an adsorbent has the advantages of simple preparation process and easy recycling; and the method has the advantages of easy operation, low cost, high efficiency and time conservation.

Description

Technical field [0001] The invention belongs to the field of sewage treatment, especially the field of treatment of sewage polluted by trace polycyclic aromatic hydrocarbons, and specifically is a rapid adsorption of electrospun nanofiber membrane using polylactic acid-caprolactone (P(LA / CL), 7 / 3) A method to remove trace amounts of polycyclic aromatic hydrocarbons in water. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a type of organic pollutants that are widely distributed in the environment and are very harmful. They have high melting and boiling points, strong hydrophobicity, low vapor pressure, and n-octanol-water partition coefficient. Higher characteristics. The main source of PAHs in the environment is man-made sources, which are produced by incomplete combustion of coal, petroleum, wood and organic polymer compounds, mostly from the chemical industry, transportation, and daily life. As a global environmental pollutant, PAHs poses a great th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F1/28
Inventor 杨志峰代云容牛军峰徐江捷李阳
Owner BEIJING NORMAL UNIVERSITY
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