Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
581745 | Journal of Hazardous Materials | 2009 | 8 Pages |
Abstract
This work contributed to the adsorption of Pb(II) onto GMZ bentonite in the absence and presence of soil humic acid (HA)/fulvic acid (FA) using a batch technique. The influences of pH from 2 to 12, ionic strengths from 0.004 M to 0.05 M NaNO3, soil HA/FA concentrations from 1.6 mg/L to 20 mg/L, foreign cations (Li+, Na+, K+), anions (Clâ, NO3â), and addition sequences on the adsorption of Pb(II) onto GMZ bentonite were tested. The adsorption isotherms of Pb(II) were determined at pH 3.6 ± 0.1 and simulated with the Langmuir, Freundlich, and D-R adsorption models, respectively. The results demonstrated that the adsorption of Pb(II) onto GMZ bentonite increased with increasing pH from 2 to 6. HA was shown to enhance Pb(II) adsorption at low pH, but to reduce Pb(II) adsorption at high pH, whereas FA was shown to decrease Pb(II) adsorption at pH from 2 to 11. The results also demonstrated that the adsorption was strongly dependent on ionic strength and slightly dependent on the concentration of HA/FA. The adsorption of Pb(II) onto GMZ bentonite was dependent on foreign ions in solution. The addition sequences of bentonite/Pb(II)/HA had no effect on the adsorption of Pb(II).
Related Topics
Physical Sciences and Engineering
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Authors
Suowei Wang, Jun Hu, Jiaxing Li, Yunhui Dong,