Mercury removal from flue gas by a MoS2/H2O heterogeneous system based on its absorption kinetics
Yongpeng Ma1, Jiandong Wang2, Xiaojing Zhang2
1Henan Province Engineering Research Center of Catalysis and Separation of Cyclohexanol, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No.136, Science Avenue, Zhengzhou, 450001, China. mayongpeng1984@163.com.
Abstract:
An enhanced MoS2/C10TAB/H2O system was built and investigated for Hg0 removal based on strengthening the Hg0 gas-liquid mass transfer. The results showed that adding 7 mg/L C10TAB can improve the Hg0 removal efficiency from 76.5 to 88.7% as decrease of the solution surface tension. Keeping 2000 rpm of stirring rate accelerated the renewal rate of gas-liquid interface, thereby enhancing Hg0 removal. SO2 slightly promoted the Hg0 removal efficiency to 91% because of the absorption of SO2 causing a decrease in the solution pH from 6.9 to 4.3. NO participated in Hg0 removal reactions but not removed in this system which visibly enhanced the Hg0 removal efficiency to 94%. The Hg mass transfer kinetics were analyzed to determine how C10TAB promoted Hg0 removal. The Hg-TPD, Hg fate, and species results revealed that Hg0 was first oxidized to Hg2+, then bonded with S to generate HgS and enrich on the MoS2. Therefore, improving the Hg0 gas-liquid mass transfer can enhance Hg0 removal in MoS2/H2O system, which can provide reference for purification of other insoluble pollutants in absorption system.
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