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Adsorption of Gaseous Elemental Mercury by Ferric‐Chloride‐Modified Activated Carbon Under Low‐Temperature Conditions
Author(s) -
Wang Xueqian,
Wang Langlang,
Bian Zhentao,
Ning Ping,
Wang Ping,
Wang Fei,
Ma Yixing
Publication year - 2018
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201800351
Subject(s) - chemistry , adsorption , activated carbon , chloride , ferric , mercury (programming language) , inorganic chemistry , hydrogen sulfide , nuclear chemistry , catalysis , sulfide , hydrogen peroxide , hydrogen chloride , sulfur , organic chemistry , computer science , programming language
Removal efficiency of elemental mercury (Hg 0 ) over activated carbon (AC) modified with ferric chloride (FeCl 3 ) is investigated at low temperatures. The effects of impregnation concentration, reaction temperature, oxygen content, relative humidity, and hydrogen sulfide (H 2 S) on Hg 0 removal efficiency are investigated. The results indicate that the removal ability of Hg 0 can be significantly improved by the introduction of FeCl 3 . Furthermore, the FeCl 3 ‐modified AC exhibit the best removal efficiency toward Hg 0 when the concentration of FeCl 3 is 0.15 mol L −1 and reaction temperature is 50 °C. In addition, H 2 S shows a positive effect on Hg 0 removal, while H 2 O(g) can inhibit the removal of Hg 0 due to competitive adsorption. Fe 2 O 3 and CCl are generated on FeCl 3 ‐modified AC (with FeCl 3 impregnation concentration of 0.15 mol L −1 ) catalyst and contribute to Hg 0 removal. Moreover, Hg exists mainly in the form of mercuric chloride (HgCl 2 ) and mercuric oxide (HgO) on the surface of the samples. Finally, the removal of Hg 0 is achieved through the following two pathways: by the reaction of Hg 0 with CCl and reaction of Hg 0 with Fe 2 O 3 .