Sorption properties of palygorskite clay mineral for limiting heavy metals pollution
Sallam, A.Sh. . 2010
Palygorskite clay mineral is considered one of the dominated clay minerals in clay fraction in many soils and sediments in Arid Regions. This study aimed to determine sorption of mercury by palygorskite clay mineral. Batch sorption and leaching experiments in soil columns were conducted using five samples. Sandy loam soil sample dominated with palygorskite, separated clay from the previous soil, washed sand, two samples of the separated clay were mixed with the washed sand at 2 and 4%. Results show that Langmuir equation was applicable to all samples of mercury adsorption data, where the values of C/(x/m) increased with the increased in equilibrium solution concentrations. The adsorption maximum (b) and binding strength (k) values were very high for mercury in the clay sample compared to other samples. Adsorption maximum of the samples can be arranged a follows clay> clay 4%> clay 2% > soil. While binding strength takes the following order: clay > soil> clay 4%> clay 2%. Results also showed that Freundlich equation (to some extent) describe mercury adsorption. Desorption data showed that the sorbed Hg was extracted by 1 N NH4OAC in the first extraction following the adsorption experiment. Results of columns experiment indicated that the highest amount of mercury was found in the 4% palygorskite clay treatment. The results suggest that palygorskite have high adsorption capacity for mercury and act as sink for added Hg and it can be used as a trap for holding Hg in the polluted soil.
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