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《Chemical Journal of Chinese Universities》 2013-02
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Studies on Laccase Immobilization of Mesoporous SiO_2/Fe_3O_4 Hollow Microspheres

WANG Miao-Miao,LI Qun-Yan,WEI Qi,NIE Zuo-Ren(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)  
Mesoporous SiO2/Fe3O4 hollow microspheres were used to immobilize laccase with a physical adsorption method.The influence of some experimental factors,such as adsorption time,temperature and pH value on laccase immobilization were investigated.The pH stability and temperature stability of the immobilized laccase were also studied under different conditions through researching its residual catalytic activity.The surface area(772 m2/g) and pore volume(0.83 cm3/g) of the mesoporous SiO2/Fe3O4 hollow microspheres decrease to 390 m2/g and 0.66 cm3/g,respectively,after laccase was immobilized on the composite microspheres.The immobilization amount of laccase in the mesoporous silica in mesoporous SiO2/Fe3O4 microspheres is 689 mg/g,which is higher than that in MCM-41(320 mg/g).The residual catalytic activities of the immobilized laccase at pH=3~6 and 60 ℃ remains higner than 80% and 60%,respectively.The immobilized laccase keeps a more stable catalytic activity than free laccase.The Michaelis constant of immobilized laccase is 1.046 mmol/L.The affinity of the immobilized laccase to its substrate declines slightly compared to free laccase.The immobilized laccase also exhibits an excellent catalytic performance in the removal of 2,4-dichlorophenol.
【Fund】: 国家“八六三”计划项目(批准号:2009AA03Z213);; 国家自然科学基金(批准号:21171014)资助
【CateGory Index】: O629.8
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