Research of sorption properties of natural montmorillonitovy clays of different fields for water purification from ions of lead (II)
Abstract
The results of investigation of sorption characteristic of natural montmorillonite-type clay from the field «Polyna», occurrence «Nelidovka», Belgorod region (Russia) and the field Tam Bo (Vietnam) are presented. Kinetics process of the lead (II) ions sorbtion by Polyana clay was studed in the different arrangements: different mass balance of sorbate to sorbent and different initial concentration of the lead (II) ions (5 mg/dm3; 120 mg/dm3). Maximum value of the average velocity is 7.9 mg/(dm3·min). It was established that the sorbtion balance both at small and high concentration (mentioned above) come up into the 1.5 hour. The adsorbtion of lead (II) ions on the clays samples concerned has been found to take place mainly in the first 15 minutes. Grain-size composition of the clay occurrence «Polyana» in the dry condition or suspension was researched by laser analyzer with particle size LS13320. Distribution curves of entitys Polyana clays were shown by sizes for fractions like 29-67 µm, 67-200 µm, 200-500 µm. Dispersiveness of clay in the water slurry higher than in the dry clay. Mean size in the first particle is drops by a factor of 1.14, in the second particle is drops by a factor of 2.85, in the biggest (third) particle is drops by a factor of 9.2. Grain-size composition influence was researched and established dependence of it on the sorption capacity with lead (II) ions. As the average size of the particles decreases more than threefold (from 360 μm to 113 μm) the sorption capacity increases more than twofold (from 6.35 mg/g to 13.99 mg/g). Further decrease of the particles size does not affect the sorption capacity. The adsorption of lead (II) ions on the sorbents involved is found to fit in with Langmuir monomolecular adsorption model in the range of initial concentrations from 80 to 440 mg/dm3. Parametric variable of Langmuir equation for clays different deposit and for the different particulate of Polyana clay: value of limitary adsorbtion (mg/g) and sorbtion balance constants (dm3/mg). The clay from «Polyna» demonstrated the maximal efficiency of purification of aqueous solution from lead (II) ions (99.8 %).
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References
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