Abstract
Majority of lead content found in the environment is the result of human activities. Heavy metals can be hazardous because they tend to bioaccumulate. Complexation-microfiltration process for the removal of Pb(II) ions was studied. The aim of microfiltration of the model wastewater containing heavy metal ions was finding an optimum ratio between the concentrations of the complexing agent and metal, and determining the most favorable pH value. The microfiltration experiments were carried out in a stirred dead-end cell. Diethylaminoethyl cellulose (DEAE 23) was selected as the complexing agent. Versapor membranes were used to separate formed polymer-metal complex. The concentration of heavy metal ions after microfiltration in aqueous solution was determined using the atomic absorption spectroscopy (AAS). Effects on the amount of complexing agent, concentration of metal ion, pH value and operating pressure on the flux, J, and rejection coefficient, R, were investigated. Experimental results indicate that the pH of the solution has considerable influence on the rejection coefficient. An increase in pH and the amount of complexing agents enabled us to obtain very high retention coefficient (99%).
Highlights
The majority of lead content found in the environment is a result of human activities
The aim of the present study is to evaluate the applicability and the efficiency of DEAE 23 and effects of operating parameters on removal of lead ions from water by complexation-microfiltration process
− It has been shown that complexation-microfiltration can be applied for removal of lead ions using DEAE 23 as a complexing agent
Summary
The majority of lead content found in the environment is a result of human activities. The efficient and selective separation of inorganic ions can be achieved by using water-soluble, polymeric reagents in combination with membrane filtration This method uses water soluble polymers to bind metal ions from aqueous solutions [4]. Since the complexation of metal ions with polymers take place in a homogeneous phase, problems encountered with multiphase separation are not observed [5]. Another advantage of this method is the lowenergy requirements involved. Polyethyleneimine was used as a watersoluble polymeric macroligand by several authors for selective separation of copper (II) and nickel (II) [10,11], K.V. TRIVUNAC, S.M. STEVANOVIĆ: LEAD REMOVAL BY COMPLEXATION-MICROFILTRATION PROCESS
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