Absorption of from a Gas-Air Mixture by Solutions Containing Iron Compounds
Publication: Journal of Environmental Engineering
Volume 146, Issue 12
Abstract
The chemisorption of sulfur(IV) oxide () from air by natural aqueous media containing iron (Fe) ions is a current area of research interest. At the same time, studies of absorption from gases with higher concentrations of and at high temperature by solutions containing Fe compounds are not enough to predict the purification process of industrial waste sulfur-containing gases. This study investigated absorption from a gas-air mixture by solutions containing Fe compounds under near-industrial conditions, viz., froth mode of bubbling, concentrations in the gas-air mixture about , and temperatures of . The experimental results showed that a rise in process temperature, concentration in the gas phase, the Fe species, and the initial pH of the absorbing solutions lead to an increase in the rate and efficiency of removal. It was determined that absorption by an Fe(II)- and Fe(III)-containing solution (initial ) consists of three stages: (1) induction, (2) increase in absorption rate, and (3) decrease in absorption rate. Absorption of occurred efficiently only in the presence of in the solution (the maximum rate of absorption reached 100%). Replacing with led to a decrease in the absorption rate by more than four times. This was caused by heterogeneous catalytic oxidation on the surface of accompanied by the formation of peroxide compounds. The proposed mechanism of heterogeneous catalytic oxidation is discussed in reference to the available information in the literature.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors thank the Water Harmony-II project (Integration of Education, Research, Innovation and Entrepreneurship) for its editorial support.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 12 • December 2020
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© 2020 American Society of Civil Engineers.
History
Received: Apr 6, 2020
Accepted: Aug 21, 2020
Published online: Oct 15, 2020
Published in print: Dec 1, 2020
Discussion open until: Mar 15, 2021
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