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Adsorption–Reduction Behavior of Co(NH 3 ) 6 3+ on Activated Carbon
Author(s) -
Mao YanPeng,
Chen Yu,
Cheng JingYi,
Zhu HaiSong,
Long XiangLi,
Yuan WeiKang
Publication year - 2012
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.201000304
Subject(s) - aqueous solution , cobalt , activated carbon , chemistry , adsorption , inorganic chemistry , x ray photoelectron spectroscopy , ammonia , redox , catalysis , selective catalytic reduction , carbon fibers , materials science , organic chemistry , composite number , chemical engineering , engineering , composite material
A novel method has been put forward to retrofit the wet ammonia desulfurization process to realize the combined removal of sulfur dioxide and nitric oxide by introducing soluble cobalt(II) salt into aqueous ammonia solution. The active constituent of scrubbing NO from the flue gases is the ${\rm Co(NH}_{{\rm 3}} {\rm )}_{{\rm 6}}^{{\rm 2 + }} $ produced by ammonia coordinating with Co 2+ . The regeneration of ${\rm Co(NH}_{{\rm 3}} {\rm )}_{{\rm 6}}^{{\rm 2 + }} $ can be realized under the catalysis of activated carbon so as to sustain a high NO removal efficiency for a long time. In this paper, the adsorption–reduction behavior of ${\rm Co(NH}_{{\rm 3}} {\rm )}_{{\rm 6}}^{{\rm 3 + }} $ on activated carbon has been researched using scanning electron microscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy. A conclusion can be drawn from the results that cobalt ions in the aqueous solution are adsorbed by activated carbon and most of them are reduced to Co 2+ ions, and some of the Co 2+ ions are further reduced into metallic cobalt. The results also demonstrate that the functional groups on the surface of carbon take part in this redox reaction. The CH groups on the carbon surface are oxidized into COH, and then some of the hydroxyl groups are further oxidized into carbonyl or carboxyl groups.