Adsorptive separation of cadmium from aqueous solutions and wastewaters by riverbed sand
2007
Sharma, Y.C. | Kaul, S.N. | Weng, C.H.
Application of riverbed sand for the adsorptive separation of cadmium(II) from aqueous solutions has been investigated. Removal increased from 26.8 to 56.4% by decreasing the initial concentration of cadmium from 7.5 x 10-5 to 1.0 x 10-5 M at pH 6.5, 25 °C temperature, agitation speed of 100 rpm, 100 μm particle size and 1.0 x 10-2 NaClO4 ionic strength. Process of separation is governed by first order rate kinetics. The value of rate constant of adsorption, kad, was found to be 2.30 x 10-2 per min at 25 °C. Values of coefficient of mass transfer, βL, were calculated and its value at 25 °C was found to be 1.92 x 10-2 cm/s. Values of Langmuir constant were calculated. Values of thermodynamic parameters ΔG0, ΔH0 and ΔS0 were also calculated and were recorded as -0.81 kcal/mol, -9.31 kcal/mol and -28.10 cal/mol at 25 °C. pH has been found to affect the removal of cadmium significantly and maximum removal, 58.4%, has been found at pH 8.5. Process can be used for treatment of cadmium(II) rich wastewaters.
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