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Background The adsorption characteristics of Pb2+ ions from aqueous solutions onto calix[4]naphthalene have been investigated. Method Calix[4]naphthalene was prepared by the condensation of 1-naphthol and formaldehyde (1:2) in presence of hydrochloric acid at 80°C. The effect of various operation parameters, such as solution pH, initial metal ion concentration, contact time, and temperature, on...
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