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Adsorption mechanism of heavy‐metal ion by microspherical tannin resin
Author(s) -
Yamaguchi H.,
Higasida R.,
Higuchi M.,
Sakata I.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070450815
Subject(s) - adsorption , metal ions in aqueous solution , metal , copper , chemistry , tannin , ion , scanning electron microscope , elution , inorganic chemistry , materials science , chemical engineering , chromatography , organic chemistry , composite material , food science , engineering
The spherical tannin resin (STR) resulting from the reaction between Mimosa ( Acacia Mollissima ) tannin (condensed‐type tannin) and formaldehyde was very porous. The specific surface area of the STR made from 37.5% of tannin was 139.2 m 2 /g (1 g of the resin in this is wet resin corresponding to 1 g of dried resin). Properties such as specific surface area and average pore radius could be controlled by adjusting the tannin concentration. The apparent activation energy of Cu 2+ ion adsorption by STR was 3 kcal/mol, and that of Cr 6+ ion was 2 kcal/mol. Since the energy was small, we concluded that the adsorption of metal ions was not influenced significantly by the adsorption temperature. The heat of adsorption for Cu 2+ ions was only 1.6 kcal/mol, which suggests that the adsorption was a physical phenomenon. It was thought that the diffusion of heavy‐metal ions into the porous resin was the rate‐determining step of the adsorption since the elution profile of the column method was analogous to the profile of active carbon, which adsorbs physically, the heavy metal ions gradually leaking through the column. The surface and cross section of the STR were observed before and after Cu 2+ ion adsorption with the scanning electron microscope. The pores of the spherical resin were clogged with adsorbed copper, suggesting that the Cu 2+ ions were adsorbed during the formation of a multimolecular layer. The adsorption may therefore have been due to physical attractive forces. The rate of adsorption and adsorption isotherms of Cu 2+ ions from copper salts having various anions was found to vary depending on the type of anion. These phenomena were not thought to be due to the properties of the spherical resin but to differences in the hydration state of copper ions.