Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
595220 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2010 | 8 Pages |
Mg2Al layered double hydroxide (Mg2Al LDH) samples intercalated with diethylenetriaminepentaacetic acid (DTPA) (Mg2Al–DTPA LDH in short) were prepared by co-precipitation and well characterized by XRD, SEM, TEM, IR and XPS. The sorption behaviors and mechanisms of Pb2+ on the samples were studied in detail while Mg2Al–Cl LDH as a reference. The maximum sorption amounts were about 170 and 40 mg/g for Mg2Al–DTPA LDH and Mg2Al–Cl LDH, respectively. Langmuir isotherm was proved to describe the sorption data better and pseudo-second order kinetic model could fit the sorption kinetic processes better for both LDHs samples. The mechanisms of Pb2+ sorption on Mg2Al–DTPA LDH can be explained by Pb–DTPA chelating while that for Mg2Al–Cl LDH is primary surface-induced precipitation. The Mg2Al–DTPA LDH could provide a potential remedy for heavy metal contamination in soils and water.