| Summary: | 碩士 === 元智工學院 === 化學工程學系 === 85 === In this paper, a complexation(ultrafiltration (UF) process was
proposed to check the feasibility for removing metal ion from
dilute solution after their complexation with water(soluble
polymers (polyelectrolytes) in homogeneous phase. The
polyeletrolytes was chitosan which is a weak base. The physical
and chemical properties such as solubility, degree of
deacetylation, molecular weight for chitosan with acetic acid
aqueous were measured. The UF flux and rejection coefficient
were measured for the system of S/M2+ by changing parameters
such as membrane material, pore size, the applied pressure, the
aqueous pH, and the concentration ratio. In the instance, the
optimal removal conditions were obtained. The equilibrium
constants of S(H'' (Ke''), S(M2+ (Kd'') and average stoichiometric
number (n) from the relation between the aqueous pH and
rejection coefficient were calculated according to the chemical
model which was based on the reaction mechanism using mass
balance. Finally, the fouling of membrane during UF process was
identified by the modified fouling index（MFI）from flux data.
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