American scientists found through experiments that using laser to irradiate soil can decompose the organic pollutants, the efficiency is higher than the traditional method, and the cost is lower. Researchers at Northeastern University reported in a new issue of the journal Applied Physics that they simulated soil with porous silica so they were contaminated with the organic compound DDE and then irradiated with a high-energy infrared laser beam to find that DDE Disappeared from the soil DDE is one of the major metabolites of the pesticide DDT and can damage the animal's reproductive system. The researchers said that laser irradiation can locally produce thousands of degrees Celsius high enough to destroy the chemical bonds of DDE molecules and break it down into water and carbon dioxide. Compared with the existing methods, the new method can remove the pollutants in the soil on site without digging out the contaminated soil, removing the contaminated soil, transporting the contaminated soil, and then transporting the contaminated soil back into the landfill. This alone can significantly reduce the cost. Researchers have envisaged that in the future it will be possible to develop on-board laser equipment equipped with loose soil machinery to purify the soil efficiently and efficiently. This method is theoretically applicable to all types of contaminants, adjusting the laser frequency to match the absorption spectrum of a particular molecule, and selectively removing harmful substances from the soil. However, researchers said the removal of other pollutants needs further confirmation.
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