Effect of polyvinylpyrrolidone on mesoporous silica morphology and esterification of lauric acid with 1-butanol catalyzed by immobilized enzyme

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• 作者：Jinyu Zhang ; Guowei Zhou ; ^{guoweizhou@hotmail.com" class="auth_mail} ; ^{gwzhou@qlu.edu.cn" class="auth_mail} ; Bin Jiang ; Minnan Zhao ; Yan Zhang
• 关键词：Morphology evolution ; Polyvinylpyrrolidone ; Curved mesoporous silica ; Immobilized lipase ; Esterification
• 刊名：Journal of Solid State Chemistry
• 出版年：May, 2014
• 年：2014
• 卷：213
• 期：Complete
• 页码：210-217
• 全文大小：2521 K

文摘

Mesoporous silica materials with a range of morphology evolution, i.e., from curved rod-shaped mesoporous silica to straight rod-shaped mesoporous silica, were successfully prepared using polyvinylpyrrolidone (PVP) and triblock copolymer as dual template. The effects of PVP molecular weight and concentration on mesoporous silica structure parameters were studied. Results showed that surface area and pore volume continuously decreased with increased PVP molecular weight. Mesoporous silica prepared with PVP K30 also possessed larger pore diameter, interplanar spacing (d₁₀₀), and cell parameter (a₀) than that prepared with PVP K15 and PVP K90. In addition, with increased PVP concentration, d₁₀₀ and a₀ continuously decreased. The mechanism of morphology evolution caused by the change in PVP concentration was investigated. The conversion rate of lauric acid with 1-butanol catalyzed by immobilized Porcine pancreatic lipase (PPL) was also evaluated. Results showed that PPL immobilized on amino-functionalized straight rod-shaped mesoporous silica maintained 50% of its esterification conversion rate even after five cycles of use with a maximum conversion rate was about 90.15%.