Selenium removal using Ca-based sorbents: reaction kinetics
Article Abstract:
A determination of the initial reaction rate and kinetic parameters of Ca-based sorbents was conducted to assess their importance in the use of the sorbents for selenium removal in combustors and boilers. Activation energy is in the magnitude of 4.03 kcal/gmol with the rate of reaction determined by the initial surface area of the sorbent. An additional finding is that the presence of SO2 decreases the reactivity between the sorbent and selenium oxide.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Mechanism of arsenic sorption by hydrated lime
Article Abstract:
Calcium hydroxide is much more effective than other mineral sorbents such as silica, kaolinite and alumina in capturing arsenic. The mechanism of the capture was investigated using hydrated lime sorbent, and it was determined that an irreversible chemical reaction occurs between arsenic and calcium hydroxide, resulting in a solid product. The capture does not occur as the result of sorption, which is the mechanism of arsenic capture using fly ash.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Selenium capture using sorbent powders: mechanism of sorption by hydrated lime
Article Abstract:
The ability of mineral sorbents to capture selenium is investigated. The results indicated that the Ca(OH)2 capture mechanism was not a mere physical adsorption process but involved a chemical interaction between CaO and SeO2. Temperature affected the reaction and the highest degree of selenium sorption was observed between 400-600 degrees. At greater temperatures, dissociation of the reaction product was assisted by thermodynamic equilibrium.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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