Rapid sampler of micro polycyclic aromatic hydrocarbon in water based on electrospinning nano-fiber membrane

Abstract

An adsorption sampler of polycyclic aromatic hydrocarbon based on an electrospinning lactic acid-caprolactone (P(LA / CL), 7 / 3) nano-fiber membrane is provided and relates to water quality monitor equipment. In the sampler, a water collection sleeve is fixed with a membrane supporting sleeve, a check valve is arranged at the lower part of the water collection sleeve and is connected with a sampling needle and the membrane supporting sleeve, the water collection sleeve can be externally connected with a polytetrafluoroethylene sampling tube to discharge water, the outer wall of the membrane supporting sleeve is used for fixing the fiber membrane to adsorb the polycyclic aromatic hydrocarbon in the water, a water diversion bin is arranged at the bottom of the membrane supporting sleeve, the bottom of the membrane supporting sleeve is connected with the check valve, and a pulling piston is used for sucking a water sample and transports the water sample to the water collection sleeve to be contacted with the fiber membrane. The electrospinning lactic acid-caprolactone (P(LA / CL), 7 / 3) nano-fiber membrane for matching is prepared through a high-voltage electrostatic spinning method. Fibers have the diameter of 200-800 nanometers and the thickness of about 0.3mm and have dense shape and strong adsorption ability. The sampler has the advantages that sampling, adsorption enrichment and solvent desorption can be synchronously carried out, the sampling quantity and a sampling frequency are easy to control, water samples before and after enrichment are respectively stored in the water collection sleeve and the membrane supporting sleeve without mutual interference, the manual operation is adopted and matching equipment, such as a vacuum pump, a power supply, a solid frame extraction bracket and the like, are not needed; the adsorption ability of the fiber membrane is strong, and the selectivity of different pollutants can be realized by changing different fiber membranes.

Description

technical field [0001] The invention relates to a polycyclic aromatic hydrocarbon adsorption sampler based on electrospun polylactic acid-caprolactone nanofiber membrane, which belongs to the field of environmental monitoring of micro-polluted water sources and the field of laboratory research. Background technique [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) are volatile hydrocarbons produced during incomplete combustion of coal, petroleum, wood and polymer compounds, and are important environmental and food pollutants. Among the more than 200 kinds of PAHs discovered so far, quite a few are carcinogenic, such as benzo[α]pyrene, benzo[α]anthracene, etc. PAHs are widely distributed in the environment, and the external environment of human beings such as the atmosphere, soil and water contain various PAHs to varying degrees. PAHs can also pollute water bodies, accumulate continuously through the food chain composed of algae, crustaceans,...

AI Technical Summary

Problems solved by technology

However, because the in-situ treatment of water samples cannot be realized, the process of enrichment and extraction of trace organic matter in water is complicated, and the treatment cost is high, the efficiency is low, and the reproducibility is poor.

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