Pore Controllable Regulation and Laccase Immobilization of Hollow Mesoporous SiO₂/Fe₃O₄ Microspheres

Abstract:

Hollow magnetic mesoporous SiO₂/Fe₃O₄ microspheres with different mesopore sizes were synthesized by a simple multi-step solution growth process. In the experiment of coating mesoporous SiO₂, cetyltrimethylammonium bromide (CTAB) was used as surfactant and two swelling agents, decane and 1, 3, 5-trimethylbenzene (TMB), were used as swelling agents alone or together with different sequence. The results showed that the magnetic mesoporous SiO₂/Fe₃O₄ microspheres have a saturation magnetization of 13.6 emu·g^-1 and a low coercivity (50 Oe). Different adding form of swelling agents had great effect on the microstructure of mesoporous SiO₂/Fe₃O₄ microspheres. The mesoporous SiO₂/Fe₃O₄ microspheres obtained by using two swelling agents together had better mesoporous properties. The mesoporous SiO₂/Fe₃O₄ microspheres exhibited high surface area (850 m²·g^-1), large peak pore (3.11 nm), high pore volume (1.23 cm³·g^-1). Moreover, the composite microspheres had larger adsorption amount (276 mg/g) and quicker adsorption rate (0.178 g/ (mg·h)) of laccase.

• Periodical: Advanced Materials Research (Volume 833)
• Pages: 93-98
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.833.93
• Online since: November 2013
• Authors: Qun Yan Li*, Qing Qiang Zhu, Qi Wei, Zuo Ren Nie
• Keywords: Decane, Laccase, Magnetic Mesoporous SiO₂, TMB

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