Abstract
Mercury emission from coal-fired power plants has posed a great threat to the environment and human, and reducing and controlling mercury emissions has become a global environmental issue. In this work, the In2S3/g-C3N4 adsorbent was prepared by simple hydrothermal method to achieve efficient removal of Hg0 from coal-fired flue gas. When the loading value of In2S3 was 40 %, the effect of removing Hg0 by as-synthesized IC-40 was the best. IC-40 showed excellent Hg0 adsorption performance in a temperature range of 80–240 °C. Under the condition of 120 °C and N2 atmosphere, the Hg0 adsorption capacity of the synthesized IC-40 reached 14.78 mg/g. The study on the impacts of flue gas components demonstrate that IC-40 has good resistance to nitric oxide, and has a slight inhibitory effect by SO2 and water vapor. According to the results of XPS and Hg-TPD, the formed main mercury compound is extremely stable HgS. In addition, DFT was conducted to calculate the adsorption energy of Hg0 on In2S3 (110) surface, which further illustrated the sulfur site served as stable adsorption site to convert Hg0 into HgS. From the above analysis, IC-40 as an efficient and scientific adsorbent to remove Hg0 from coal-fired power plants is a promising technical method.
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