Recovery of precious metals using lignophenol compounds

The adsorption behavior of crosslinked lignophenol gel for various metal ions from chloride media was investigated. The gel was found to exhibit selectivity only for Au(III) over a wide range of hydrochloric acid concentration. Also, ethylenediamine group immobilized lignophenol gel (EN–lignin) was found to be selective also for Pd(II) and Pt(IV) with enhanced efficiency for Au(III).