# Investigation of the Potential of Repurposing Medium-Density Fiberboard Waste as an Adsorbent for Heavy Metal Ion Removal

## TL;DR

This study explores using MDF waste to remove heavy metals from water, showing it can effectively adsorb lead and other ions.

## Contribution

The study demonstrates MDF waste as a low-cost adsorbent for heavy metal removal, with insights into adsorption mechanisms and regeneration.

## Key findings

- MDF waste showed highest adsorption for Pb(II) ions in single-metal systems.
- Pb(II) adsorption followed Freundlich isotherm and pseudo-second-order kinetics.
- Cd(II) ions reduced Pb(II) adsorption in multi-metal systems but Pb(II) remained preferred.

## Abstract

Medium-density fiberboard (MDF) waste generation has increased steadily over the past decades, and therefore, the investigation of novel methods to recycle this waste is very important. The potential of repurposing MDF waste as an adsorbent for the treatment of Cd(II), Cu(II), Pb(II), and Zn(II) ions in water was investigated using MDF offcuts. The highest adsorption potential in single-metal ion solution systems was observed for Pb(II) ions. The experimental data of Pb(II) ions fit well with the Freundlich isotherm and pseudo-second-order kinetic models. Complexation and electrostatic interactions were identified as the adsorption mechanisms. The adsorption behavior of multi-metal ion adsorption systems was investigated by introducing Cd(II) ions as a competitive metal ion. The presence of the Cd(II) ions reduced the adsorption potential of Pb(II) ions, yet the preference for the Pb(II) ions remained. Regeneration studies were performed by using 0.1 M HCl as a regeneration agent for both systems. Even though a significant amount of adsorbed metal ions were recovered, the adsorption potential of the MDF was reduced in the subsequent adsorption cycles. Based on these results, MDF fines have the potential to be used as an economical adsorbent for remediation of wastewater containing heavy metal ions.