Abstract
Magnetite (Fe(3)O(4)) were successfully synthesized at ambient temperature (25°C) as the adsorbent for the removal of Pb(II) ions from lead-ammonia wastewater. The magnetite exhibited a magnetization saturation value of 82.30 emu/g, illustrating the magnetite particles could be readily recovered from water under an external magnetic field. Comparing the removal capacity of Pb(II) ions in solution with NH(3)-N and without NH(3)-N, and several factors effecting the adsorption of Pb(II) ions such as pH, contact time and ammonia nitrogen were investigated. The adsorption of Pb(II) ions onto the magnetite fitted well with the pseudo-second-order kinetics and Langmuir isotherm model. And the maximum adsorption capacities reached up to 123.15 mg/g. Ammonia nitrogen in solution could hinder the adsorption of Pb(II) ions. This study demonstrates that magnetite offers a cost-effective solution for treating complex wastewater, with potential applications in industrial wastewater treatment for heavy metal removal.