Enzyme immobilization on amino-functionalized Fe3O4@SiO2 via electrostatic interaction with enhancing biocatalysis in sludge dewatering

Enzymes have important advantages in sludge dewatering, but their catalytic performance is limited by their poor activity and stability. To address this issue, we develop a series of immobilized enzymes (immobilized acid protease, IE 1; immobilized pectinase, IE 2; immobilized laccase, IE 3) prepared by the electrostatic interaction between the Fe3O4@SiO2-NH2 as immobilized carrier and the free enzyme, and used for sludge dewatering. As-obtained...