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Study of the interaction of molybdenum(VI) ions with γ‐alumina by pulse technique
Author(s) -
Jannibello A.,
Trifirò F.
Publication year - 1975
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19754130310
Subject(s) - molybdenum , adsorption , chemistry , aqueous solution , inorganic chemistry , ammonium , absorption (acoustics) , ion , ion exchange , cobalt , materials science , organic chemistry , composite material
The mechanism of interaction between molybdenum(VI) as aqueous solutions of ammonium paramolybdate and γ‐alumina, has been studied in transient conditions by pulse technique, using combined differential refractive index and u.v. absorption detectors. In acidic environment, molybdenum(VI) species are irreversibly adsorbed through an anionic exchange mechanism with liberation of ammonium salts. In a neutral environment, molybdenum(VI) species are only partially irreversibly adsorbed onto γ‐alumina through a protonic transfer mechanism with liberation of basic species. The depletion of H 3 O + due to adsorption of molybdenum(VI) from neutral solution, provides an explanation of the observed mutual enhancement of cobalt(II) and molybdenum(VI) adsorption on alumina. The general result presented in this paper can be summarized by stating that the amount of irreversibly adsorbed molybdenum(VI) is related to the amount of available basic sites present onto alumina.