Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights
Reaction mechanisms for the removal of Hg0 by a TiO2 photocatalyst in the presence of O2, the main electron acceptor for the photocatalyst, were proposed. The Hg0 removal efficiency was over 90%, and the desorption efficiency was approximately 70%. As the photocatalyst reacted with Hg0, TiO2 was act...
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doaj-8cee99b4449e4a89a3cf83699f6576572021-07-31T04:41:16ZengElsevierChemical Engineering Journal Advances2666-82112021-11-018100157Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lightsJung Hoon Lim0Tai Gyu Lee1Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South KoreaCorresponding author.; Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South KoreaReaction mechanisms for the removal of Hg0 by a TiO2 photocatalyst in the presence of O2, the main electron acceptor for the photocatalyst, were proposed. The Hg0 removal efficiency was over 90%, and the desorption efficiency was approximately 70%. As the photocatalyst reacted with Hg0, TiO2 was activated, forming OH radicals on the surface that oxidized Hg. HgO was formed in the first layer, and Hg0 was captured. Then, oxidized Hg acted as an electron acceptor. Physical adsorption between Hg0 molecules was realized by the reaction of Hg0 and HgOH. The adsorption of Hg0 was analyzed by various surface analysis methods, and the results proved that physical and chemical adsorption occurred. After this adsorption, desorption with alcohol was performed. Hg0 was desorbed, and HgO was reduced by the simultaneous illumination by light and addition of alcohol. The analytical and calculated values were compared for quantitative confirmation.http://www.sciencedirect.com/science/article/pii/S2666821121000739Elemental mercury (Hg0)Titanium dioxide (TiO2)AdsorptionDesorptionAlcoholFluorescent light |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jung Hoon Lim Tai Gyu Lee |
spellingShingle |
Jung Hoon Lim Tai Gyu Lee Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights Chemical Engineering Journal Advances Elemental mercury (Hg0) Titanium dioxide (TiO2) Adsorption Desorption Alcohol Fluorescent light |
author_facet |
Jung Hoon Lim Tai Gyu Lee |
author_sort |
Jung Hoon Lim |
title |
Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights |
title_short |
Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights |
title_full |
Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights |
title_fullStr |
Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights |
title_full_unstemmed |
Chemistry of the unusually high uptake and recovery of gas-phase Hg0 by TiO2 even under household fluorescent lights |
title_sort |
chemistry of the unusually high uptake and recovery of gas-phase hg0 by tio2 even under household fluorescent lights |
publisher |
Elsevier |
series |
Chemical Engineering Journal Advances |
issn |
2666-8211 |
publishDate |
2021-11-01 |
description |
Reaction mechanisms for the removal of Hg0 by a TiO2 photocatalyst in the presence of O2, the main electron acceptor for the photocatalyst, were proposed. The Hg0 removal efficiency was over 90%, and the desorption efficiency was approximately 70%. As the photocatalyst reacted with Hg0, TiO2 was activated, forming OH radicals on the surface that oxidized Hg. HgO was formed in the first layer, and Hg0 was captured. Then, oxidized Hg acted as an electron acceptor. Physical adsorption between Hg0 molecules was realized by the reaction of Hg0 and HgOH. The adsorption of Hg0 was analyzed by various surface analysis methods, and the results proved that physical and chemical adsorption occurred. After this adsorption, desorption with alcohol was performed. Hg0 was desorbed, and HgO was reduced by the simultaneous illumination by light and addition of alcohol. The analytical and calculated values were compared for quantitative confirmation. |
topic |
Elemental mercury (Hg0) Titanium dioxide (TiO2) Adsorption Desorption Alcohol Fluorescent light |
url |
http://www.sciencedirect.com/science/article/pii/S2666821121000739 |
work_keys_str_mv |
AT junghoonlim chemistryoftheunusuallyhighuptakeandrecoveryofgasphasehg0bytio2evenunderhouseholdfluorescentlights AT taigyulee chemistryoftheunusuallyhighuptakeandrecoveryofgasphasehg0bytio2evenunderhouseholdfluorescentlights |
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