Eco-friendly, renewable Hochst-based adsorbents remove high quantities of Zn in water.

Although not considered poisonous and with natural occurrence, Zn contamination is mainly related to anthropic actions. This research aim was to develop, from crambe wastes, adsorbents with high adsorption capacity of Zn. The crambe biomass was modified with HO, HSO and NaOH 0.