Citation:
ZHANG Shuqin, LU Fusui, LI Lifang, SUN Tingting. Sorption of Pb2+ on Montmorillonite and Kaolinite[J]. Chinese Journal of Applied Chemistry,
;2011, 28(12): 1441-1447.
doi:
10.3724/SP.J.1095.2011.00722
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Sorption activities of Pb2+ on montmorillonite and kaolinite were studied and a sorption mechanism was proposed.The sorption kinetics and the sorption isotherms of Pb2+ on montmorillonite and kaolinite can be described by the pseudo-second-order kinetics and Langmuir isotherm respectively.The sorption mechanism of Pb2+ on the montmorillonite and kaolinite is the surface complex mechanism,simultaneously forming innersphere surface complexes and outer-sphere surface complexes.The relative content of inner(or outer)-sphere surface complexes is pH dependent and is dominant beyond(or within) the pH range of 4~8,respectively.The sorption amount in mg/g of Pb2+ on montmorillonite is obviously higher than that on kaolinite.The affinity of montmorillonite for Pb2+ is higher than that of kaolinite for Pb2+.
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Keywords:
- montmorillonite,
- kaolinite,
- Pb2+,
- sorption mechanism
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