Separable amino-functionalized biochar/alginate beads for efficient removal of Cr(VI) from original electroplating wastewater at room temperature

An alginate gel bead composite adsorbent with polyethyleneimine (PEI) as a surface modifier and Eichhornia crassipes (EC) biochar, known EC-alg/PEI-3, was added internally to the adsorb Cr(VI) from an aqueous environment. The functionalized beads were characterized using SEM, XPS, FTIR, other techniques. maximum adsorption capacities of EC-alg/PEI-3 714.3 mg g?1 at 10 °C 769.2 25 °C. In treatment highly concentrated electroplating wastewater, can be dosed 1.4 g L?1 reduce concentration below 0.05 ppm. maintained competitive capacity after six cycles. This spherical material is easy prepare, has very high capacity, environmentally friendly, easily recycled. are promising for industrial wastewater.