Characterization and Properties of Manganese Oxide Coated Zeolite as Adsorbent for Removal of Copper(II) and Lead(II) Ions from Solution

A new adsorbent, manganese oxide coated zeolite (MOCZ), was characterized and employed for the removal of Cu(II) and Pb(II) from aqueous solution using batch equilibrium experiments. Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and BET analyses were used to observe the surface properties of the coated layer. Binding of Cu(II) and Pb(II) ions by MOCZ was clearly pH-dependent, and the loading capacities increased with increasing pH. Adsorption behavior of Cu(II) and Pb(II) ions can be approximately described with the Langmuir and Redlich−Peterson equation. The thermodynamic parameters (Δ G °, Δ H °, and Δ S °) were also determined, and the adsorption process is more favored at higher temperatures.