TEPA modified magnetic cellulose nanocrystals for efficient and highly selective removal of Cr(VI) from electroplating wastewater by high-density amine-based sites.

Efficient and highly selective elimination of Cr(VI) from electroplating effluent with complex nature is still very meaningful and challenging. Here, based on the mechanism of selective adsorption, an amino-functionalized cellulose-based magnetic adsorbent (FeO@CNC@TEPA) was designed with efficient and cost-effective. The adsorbent base material cellulose nanocrystals (CNC) was combined with a magnetic core (FeO) by co-precipitation, and then the selective functional monomer tetraethylenepentamine (TEPA) was grafted onto the CNC surface in large quantities under the action of the cross-linking agent epichlorohydrin (ECH).