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Technical
Note Determining the Overall Mass Transfer
Coefficient for Adsorption of Cu2+ Ions onto Ca-Alginate in Fixed Bed Column In
this study, adsorption of trace amounts of dissolved Cu2+ ion was investigated. The
polymeric Ca-alginate particles was used as adsorbent. The pH of the solution affected the
metal uptake capacity of the Ca-alginate and optimum initial pH of the solution was found
as 4 at 25°C constant temperature for this study. The experiments were done at the same
volumetric rates and different initial solute concentrations in the fluid. The equilibrium
concentration in the fluid, c*, does equal to zero for irreversible adsorption and it is
practically zero until the solid concentration is over half the saturation value. The
adsorption isotherm of Cu2+ ion onto the above mentioned spherical Ca-alginate particles
is indeed sharply convex and the corresponding value of equilibrium concentration, c*, is
at a negligible level and the assumption c*=0 is valid. The Cu2+ ion equilibrium
concentration is approximate zero even for the maximum adsorbate loading conditions of
fixed bed sorption with recycle experiments. The overall mass transfer coefficient of Ke
was obtained without the assumption (c/t)=0. |
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