Abstract
Spent coffee ground (SCG), left over in coffee making, is the most abundant coffee byproduct, of which approximately 70% is made by cellulose and hemicellulose. Herein, we obtained a delignified SCG (D-SCG) by using an aqueous solution of 3 wt% NaOH for 1 h at 90 °C and then an aqueous solution of 3 wt% NaClO2 buffered with acetic acid at pH 4.3 for 2 h at 90 °C, respectively. Next, we used the D-SCG to fabricate holocellulose nanofibers (HCNF) suspension by TEMPO-Mediated oxidation. Finally, HCNF suspension was manufactured into superhydrophobic foams for oil-water separation through freeze-drying and hydrophobic modification. The superhydrophobic foams showed good properties of oil absorption capacity (16 g/g), separation efficiency (98.5%) and continuous separation. This work presents a novel idea for the further application of SCG and provides an eco-friendly and sustainable oil absorbent material to solve oil spill.
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