Abstract
Heavy metal pollution is a major threat to living systems due to increase in the industrial development worldwide. In this study, the adsorption of lead (II) ions by chemically modified polyurethane was reported. Polyurethane (PU) was chemically modified by sulphonation and chlorination to obtain sulphonated PU (SPU) and chlorinated PU (CPU). The adsorption parameters such as pH, contact time, adsorbent loading and initial metal ion concentration were optimized in batch experiments for both the adsorbents. Maximum Pb (II) ion adsorption of 90 and 85% was observed for SPU and CPU respectively at optimal conditions. Isotherms results showed that the equilibrium data was fitted with Freundlich isotherm and followed multilayer adsorption mechanism. Adsorption of Pb (II) ions by both SPU and CPU followed pseudo second order kinetics. The outcome of this study showed that chemical modification of PU is effective for efficient removal of Pb (II) ions from effluent.
Highlights
Heavy metal pollution in the environment was mainly caused by the industrial waste discharge to water bodies.[1]
The present study revealed that the efficiency of sulphonated PU (SPU) and chlorinated PU (CPU) for the removal of Pb (II) ions from the aqueous
Adsorption- desorption cycles solution was highly depends on pH, contact time, adsorbent dosage and initial adsorbate concentration. 15 g /L of SPU effectively removed 95% of Pb (II) ion from 10 mg/L concentrated aqueous solutions at pH 4 for 90 minutes contact time. 20 g/L of CPU effectively removed 85 % of Pb (II) ion from 10 mg / L concentrated aqueous solutions at pH 4 for 120 min contact time.Adsorption data fitted with Langmuir and Freundlich isotherm model
Summary
Heavy metal pollution in the environment was mainly caused by the industrial waste discharge to water bodies.[1]. Water contaminated by toxic metal ions remains a serious public health problem for human health.[2] Unique properties of lead like high ductility, flexibility, softness, resistance to corrosion and low melting point have resulted in its widespread usage in different industries like ceramics, plastics, automobiles, paint, etc. This in turn has led to a manifold rise in the occurrence of free lead in biological systems and environment. It could be much more severe, if not treated in time resulted by encephalopathy, persistent vomiting, delirium, lethargy, convulsions and coma.[4,5]
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