Removal of Copper Ion by Foaming in Batch Operation

Abstract

As N-(β-hydroxyhexadecyl)diethylenetriamine forms chelate complexes with metallic ions in an aqueous solution showing excellent foaming ability, this character may be utilized to remove metallic ions by foaming. The adsorptive character of an aqueous solution of β-0HC₁₆DT- Cu(II) complex in a batchwise type column has been studied to know the effective conditions for removing metallic ions by foaming.
From a result of the rate of r emoving copper ion in the range of 1.57 x 10^-8-3.15 X 10^-7mol/cms, keeping the concentrations of the agent (collector) and copper ion to be equimolar, it has been presumed the mechanism of the adsorption to be of Langmuir type. If the kinetics was dealt with by assuming the average diameter of bubbles to be constant, the solution to be complete by miscible and the foam to leave from the column as a piston flow under the condition of equilibrium, the plots of the reciprocal of initial rate against the initial concentra tion of residual solution gave a straight line. From the slope and the intercept, the parameters of Langmuir adsorption, i. e., 6 Γ*/d and K, have been derived to be 1.84 X 10^-8 molfcms and 2.13 X 10^-8 mol/cm³, respectively.
From the concentr ation curves of residual solutions derived from the above values, it has been found that experimental values agreed well with the theoretical ones when the value of C/C₀ was more than 0.4.