The scope of this study was to prepare different organosilane-modified Fe 3 O 4 @SiO 2 core magnetic nanocomposites with immobilized lipase and explore their potential application in biodiesel field. Fe 3 O 4 magnetic nanoparticles prepared by co-precipitation method were coated with various ratios of SiO 2 as per Stöber method and further functionalized by different organosilane compounds APTES (3-aminopropyltriethoxysilane) and MPTMS (3-mercaptopropyltrimethoxysilane). Functionalized Fe 3 O 4 @SiO 2 magnetic nanoparticles were immobilized with free lipase NS81006 by glutaraldehyde cross-linking reagent. The functional groups, structure, morphology and magnetic susceptibility of synthesized and modified Fe 3 O 4 @SiO 2 magnetic nanoparticles were characterized by FTIR, XRD, SEM, TEM, and VSM techniques. The immobilization efficiency and activity recovery were reduced by increasing the ratio of silica coating on Fe 3 O 4 . Maximum activity recovery (84% by APTES, 83% by MPTMS) and biodiesel yield (>90%) were obtained by lipase immobilized on Fe 3 O 4 @SiO 2 support when the Fe 3 O 4 and SiO 2 (TEOS) ratio was low (1:0.25).
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Thangaraj et al. (2016) studied this question.
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