TY - JOUR
T1 - Characteristics of adsorption interactions of cadmium(II) onto humin from peat soil in freshwater and seawater media
AU - Andreas, Roy
AU - Zhang, Jing
PY - 2014/3
Y1 - 2014/3
N2 - The present study examined Cd solubility in pH 2-12 fresh and seawater media with and without humin to determine Cd species composition. The study, based on the Langmuir-Hinshelwood kinetics model, was conducted to determine the kinetic parameters of Cd(II) adsorption onto humin. We employed the Langmuir and Freundlich models to derive thermodynamic parameters. Aquo (Cd(H 2O) 6 2+) and chloro- (CdCl+ and CdCl2) complexes were responsible for Cd(II) adsorption onto humin. Results showed Cd as Cd(II) and Cd(H2O) 6 +2 was water soluble at 2 < pH < 7; with a portion of the soluble Cd precipitating as Cd(OH)2. The Cd(II) rate constant (k) in freshwater was 0.5 × 10-3 (min-1), occurring in a single phase, while in seawater fast and slow phase values for k were 31.88 × 10 -3 and 6.2 × 10-3 (min-1), respectively. The adsorption curves showed a better fit with the Langmuir than the Freundlich model.
AB - The present study examined Cd solubility in pH 2-12 fresh and seawater media with and without humin to determine Cd species composition. The study, based on the Langmuir-Hinshelwood kinetics model, was conducted to determine the kinetic parameters of Cd(II) adsorption onto humin. We employed the Langmuir and Freundlich models to derive thermodynamic parameters. Aquo (Cd(H 2O) 6 2+) and chloro- (CdCl+ and CdCl2) complexes were responsible for Cd(II) adsorption onto humin. Results showed Cd as Cd(II) and Cd(H2O) 6 +2 was water soluble at 2 < pH < 7; with a portion of the soluble Cd precipitating as Cd(OH)2. The Cd(II) rate constant (k) in freshwater was 0.5 × 10-3 (min-1), occurring in a single phase, while in seawater fast and slow phase values for k were 31.88 × 10 -3 and 6.2 × 10-3 (min-1), respectively. The adsorption curves showed a better fit with the Langmuir than the Freundlich model.
KW - Cadmium (II)
KW - Freshwater media
KW - Humin
KW - Seawater media
UR - http://www.scopus.com/inward/record.url?scp=84894316028&partnerID=8YFLogxK
U2 - 10.1007/s00128-014-1205-x
DO - 10.1007/s00128-014-1205-x
M3 - 学術論文
C2 - 24464297
AN - SCOPUS:84894316028
SN - 0007-4861
VL - 92
SP - 352
EP - 357
JO - Bulletin of Environmental Contamination and Toxicology
JF - Bulletin of Environmental Contamination and Toxicology
IS - 3
ER -