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Scientists find that the use of modified nano-diamonds can quickly detect water pollution

wallpapers News 2021-04-08
Scientists from the Institute of Biophysics of the Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences confirmed that nano-grade diamonds can be used to detect phenolic and highly toxic substances in water. This discovery provides a new way to quickly monitor environmental pollution. Related research results were published in the "Journal of Nanoscience and Nanotechnology" (Journal of Nanoscience and Nanotechnology). Detonation of carbon-containing explosives (for example, a mixture of TNT explosives and hexogen) in a closed chamber with insufficient oxygen content can obtain nano-diamonds. The essence of nano-diamond particles is an inert diamond core covered with chemically active impurities. After the explosion, the free chemical bonds of carbon atoms on the surface combine with impurities in the medium (such as hydrocarbon fragments, metal atoms), thereby giving nanodiamonds chemical activity.
The researchers modified the surface of nano-diamond particles and obtained nano-diamonds with high colloidal stability in different media such as water, organic solvents, and oil. If deionized water is added to the modified nano-diamond powder, a solution can be formed, and the nanoparticles in the solution can remain suspended for several years without aggregation or precipitation. The modified nanodiamond suspension obtained in this way can be repeatedly dried many times, and after adding water, the original characteristics will be obtained again. In addition, modified nano-diamonds can still maintain colloidal stability after freezing and thawing, boiling, and autoclaving. The researchers pointed out that the original nano-diamond does not have this property, and it is difficult to obtain a stable suspension even through long-term ultrasonic treatment that can disperse the nanoparticles. Experiments show that modified nanodiamonds are not easy to agglomerate and can be used as a catalyst in chemical reactions. If it is added to a mixed reagent used to detect phenolic substances such as amino antipyrine, hydrogen peroxide, and phenol, the solution will quickly turn into a bright deep red. According to the number of colored products obtained, the concentration of phenol in the water sample can be determined by spectroscopy. The researchers found that this reaction occurred due to the presence of trace amounts of iron and copper ions on the surface of the nanoparticles.
The researchers also tested whether the modified nano-diamond particles can be reused multiple times. After each water sample test, the researchers cleaned the nanoparticles and reused them in the test reaction. Experiments have proved that the same nano-diamond sample can be used at least 7 times in phenol detection. Currently, researchers are developing a new indicator that uses diamond nanoparticles fixed on a substrate to detect phenol in a solid carrier. The new indicator will be more convenient in actual use. For example, a diamond nanoparticle rod is immersed in a water sample, and the color of the reaction product is compared with a test scale to obtain the degree of contamination of the water sample with phenol.

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