Abstract
The emission of heavy metal elements (especially the most toxic Hg) from coal-fired power plants has always been a hot issue in the environmental field. Nickel selenide was first applied to flue gas mercury removal in this work, and a new adsorbent of Nickel selenide (Ni0.85Se) loaded with graphite carbon nitride (g-C3N4) was developed to effectively remove elemental mercury. When the loading mass of g-C3N4 is 20%, NS/20CN has 100% mercury removal efficiency. Meanwhile, it will not be poisoned by NO and SO2 in the flue gas. At the same time, NS/20CN also has strong magnetism that is not permanently magnetized, and can be separated from the downstream magnetic field of WESP for heat treatment to recover ultra-low concentrations of Hg0 and reused. Therefore, this work demonstrates that NS/20CN adsorbent has excellent performance and economy in efficiently removing elemental mercury and has also broadened the application of Nickel selenide in the environmental field, providing an efficient guidance method for the treatment of other environmental pollutants.
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