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 of water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of poor performance of organic matter, achieve strong adsorption capacity, fast adsorption, and simple preparation process Effect

Inactive Publication Date: 2010-11-24
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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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

[0033] Wherein the preparation steps of the electrospun nanofiber membrane include:

[0034]1) Polylactic acid-caprolactone co-(P(LA / CL), 7 / 3) particles with a molecular weight of 100,000 were dissolved in methylene chloride, and a block copolymer surfactant was added to optimize spinning performance, Stir for 2 hours after uniform mixing 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);

[0035] 2) The high-voltage electrospinning equipment consists of a DC high-voltage power supply, a spinneret and a receiving device. The mixed gel obtained in step 1) was introduced into a high-voltage electrospinning device, the power supply voltage was adjusted to 10 kV, and the receiving distance was 15 cm to obtain stable and continuous spraying. During the whole process of spinning, infrared light is used to irradiate the dichloromethane completely;

[0036] 3) Collect the electrospun fiber membrane ...

Embodiment 1

[0047] 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 F018 was added, mixed evenly and stirred for 2 hours to obtain a mixed gel. The mixed gel is then introduced into a high-voltage electrospinning device to be spun. Adjust the voltage of the high-voltage power supply to 10 kV, and the receiving distance is 15 cm to obtain a stable and continuous jet stream, and collect the fiber product on the receiving plate covered with aluminum foil. During the whole process of spinning, infrared light was used to irradiate the dichloromethane completely. After 4 to 5 hours, when the thickness of the fiber membrane reaches 0.3 to 0.5 mm, the spinning is stopped to obtain polylactic acid-caprolactone (P(LA / CL), 7 / 3) electrospun nanofiber membrane. Electrospun nanofiber membranes of polylactic acid-caprolactone (P(LA / CL), 7 / 3) were characterized by fiber morphology under a field emiss...

Embodiment 2

[0050] The preparation steps of the electrospun nanofiber membrane are the same as in Example 1.

[0051] The resulting polylactic acid-caprolactone (P(LA / CL), 7 / 3) electrospun nanofibrous membrane was cut into 1.5 cm × 1.5 cm squares and peeled off from the aluminum foil. Then weigh 0.1 grams (about 5 pieces) of electrospun nanofiber membranes and add them to 50 milliliters of 7 kinds of polycyclic aromatic hydrocarbons mixed solutions with a concentration of 3 micrograms per liter; and place the mixed system at 30°C and 120 rpm Shake down, react after 20 minutes and take a sample and measure through high-performance liquid chromatography (DIONEX U3000, the U.S.), this method is respectively to the adsorption removal rate of 7 kinds of polycyclic aromatic hydrocarbons: dihydroacenaphthene 82.4%, fluorene 82.6%, phenanthrene 85.5%, Anthracene 88.6%, fluoranthene 85.6%, pyrene 84.4%, 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, in particular to the field of treatment of sewage polluted by trace polycyclic aromatic hydrocarbons, and specifically relates to a rapid adsorption method using polylactic acid-caprolactone (P(LA / CL), 7 / 3) electrospun nanofiber membranes A method for removing trace polycyclic aromatic hydrocarbons from water. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants widely distributed in the environment and are very harmful. They have high melting point and boiling point, strong hydrophobicity, low vapor pressure, and n-octanol-water partition coefficient. advanced features. The main source of PAHs in the environment is anthropogenic, which is produced by incomplete combustion of coal, petroleum, wood and organic polymer compounds, mostly from chemical industry, transportation, and daily life. As a global environmental pollutant, PAHs pose a great t...

Claims

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Application Information

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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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