In this paper, magnetic host/guest-type immobilized laccase was prepared by co-adsorption of superparamagnetic
particles (SPMNPs) and laccase into the pore channels of tubular mesoporous SiO2 by the
“size-matching effect”. After immobilization, the thermal stability and repetition usage-ratio of immobilized
laccase were improved significantly, the loading amount of enzyme and SPMNPs was determined by
Lowry’s method and EDS (Energy Dispersive Spectroscopy), respectively. Under the optimal conditions,
the removal efficiency of MXC (Methoxychlor) by immobilized laccase reached 69.4% and the removal
efficiency still remained 45.4% after six cycles of operations. The studies on degradation kinetics of MXC
by free and immobilized laccase were also carried out, respectively. In virtue of GC–MS, 1H NMR and 13C
NMR analysis, (CH3OC6H5)2C CHCl and 1,1-diphenylethylene were identified as intermediate and final
degradation products of MXC, respectively, further demonstrating the degradation mechanism of MXC
by the immobilized laccase.