Document Detail


Adsorption of Co2+ and Zn2+ Ions on Hydrous Fe(III), Sn(IV), and Fe(III)/Sn(IV) Oxides
MedLine Citation:
PMID:  8954637     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Thermal analysis has shown that contrary to the case of Zn2+, considerable amounts of water enter in HFO (hydrous ferric oxide), HSO (hydrous stannic oxide), and HMO (hydrous mixed oxide) when Co2+ is adsorbed. A large amount of Co2+ and Zn2+ in all the oxides cannot participate in isotopic exchange, seemingly because of being trapped inside the micropores, a fact hindering oxide capacity determination by isotopic dilution. The % adsorption-pH curves for tracer and 10(-3) M transition metal chloride solutions show a general preference to Zn2+ over Co2+ by all the oxides, in agreement with thermal analysis data. Large shifts of these curves to the left occur with tracer experiments on many samples on adding 0.1 M NaCl, probably due to Cl- adsorption accompanied by a change in the adsorption mechanism. Conclusions from log Kd-pH plots may be erroneous, probably due to changes in the activity coefficients of surface species even at sufficiently low surface coverages. More adsorption of Co2+ and Zn2+ generally occurs on the oxide of lower pHPZC (higher acidity).
Authors:
Misak; Ghoneimy; Morcos
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  184     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1996-12-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  31-43     Citation Subset:  -    
Affiliation:
Nuclear Chemistry Department, Atomic Energy Authority, Cairo, Atomic Energy Post Code 13759, Egypt
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