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Adsorption of Pb 2+ on Chitosan Cross‐Linked with Triethylene‐Tetramine
Author(s) -
Tang X.H.,
Zhang X.M.,
Guo C.C.,
Zhou A.L.
Publication year - 2007
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200600379
Subject(s) - adsorption , epichlorohydrin , chemistry , chemisorption , tetramine , aqueous solution , sorption , infrared spectroscopy , langmuir adsorption model , nuclear chemistry , langmuir , triethylene glycol , analytical chemistry (journal) , inorganic chemistry , chromatography , polymer chemistry , organic chemistry
A novel triethylene‐tetramine cross‐linked chitosan (CCTS) was synthesized via the cross‐linking of triethylene‐tetramine and epichlorohydrin activated chitosan. Its structure was characterized by elemental analysis, infrared spectroscopy and X‐ray diffraction analysis, and the surface topography was determined with ESEM. The results were in agreement with expectations. The capacity of CCTS to adsorb Pb 2+ ions from aqueous solutions was examined, and equilibrium and kinetic investigations were undertaken. The adsorption isotherms were fitted well by the Langmuir equation ( R > 0.999). The maximum adsorbed amount, at pH 5.5, with an initial concentration of 3 mmol/L (621 ppm), was 378.8 mg/g. The adsorption process could be best described by a second‐order equation ( R = 1). This suggests that the rate‐limiting step may be the chemical adsorption (chemisorption) step and not the mass transport. The separation factor used was 0 < R L < 1. Therefore, it can be concluded that CCTS is an effective adsorbent for the collection of Pb 2+ .