Mercury removal from flue gas by a MoS2/H2O heterogeneous system based on its absorption kinetics

• Published in: Environmental science and pollution research international Vol. 30; no. 11; pp. 29043 - 29051
• Main Authors: Ma, Yongpeng, Wang, Jiandong, Zhang, Xiaojing, Gu, Wentao, Han, Lifeng, Li, Yakun
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2023
• Subjects: Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Research Article; Waste Water Technology; Water Management; Water Pollution Control; MoS; removal; Mass transfer enhancement; Surfactant; Flue gas; Hg
• ISSN: 1614-7499; 1614-7499
• DOI: 10.1007/s11356-022-24195-y

An enhanced MoS 2 /C 10 TAB/H 2 O system was built and investigated for Hg 0 removal based on strengthening the Hg 0 gas–liquid mass transfer. The results showed that adding 7 mg/L C 10 TAB can improve the Hg 0 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 Hg 0 removal. SO 2 slightly promoted the Hg 0 removal efficiency to 91% because of the absorption of SO 2 causing a decrease in the solution pH from 6.9 to 4.3. NO participated in Hg 0 removal reactions but not removed in this system which visibly enhanced the Hg 0 removal efficiency to 94%. The Hg mass transfer kinetics were analyzed to determine how C 10 TAB promoted Hg 0 removal. The Hg-TPD, Hg fate, and species results revealed that Hg 0 was first oxidized to Hg 2+ , then bonded with S to generate HgS and enrich on the MoS 2 . Therefore, improving the Hg 0 gas–liquid mass transfer can enhance Hg 0 removal in MoS 2 /H 2 O system, which can provide reference for purification of other insoluble pollutants in absorption system.