期刊
APPLIED CATALYSIS A-GENERAL
卷 499, 期 -, 页码 77-88出版社
ELSEVIER
DOI: 10.1016/j.apcata.2015.04.007
关键词
Laccases; Carbon nanotubes; Redox mediators; Heterogeneous catalysis; Synthesis of aldehydes
资金
- Italian Space Agency (ASI) [2014-026-R.0 (CUP: F 92I14000030005)]
Laccase from Trametes versicolor was immobilized on multi-walled carbon nanotubes MWCNTs) applying two different strategies based on the layer by layer (LbL) procedure: (i) the direct adsorption on pristine MWCNTs followed by coating with PDDA and a second layer of enzyme (catalyst II), and (ii) the adsorption on modified MWCNTs and PDDA (catalyst III). The new catalysts were characterized by microscopy (SEM, AFM and HRTEM) and electrochemical (cyclic voltammograms) analyses, confirming the deposition of enzyme and polyelectrolyte layers, and the role of polyelectrolyte to enhance the electron transfer rate. Kinetic, storage and reusability data showed a good activity and higher stability than the system obtained by simple deposition of laccase on MWCNTs (catalyst I). Catalysts I-III were applied in the selective and efficient synthesis of aldehydes in the presence of redox mediators (TEMPO and ABTS). Catalyst II and TEMPO were more active (quantitative conversion of substrate and yield of product) and selective than catalysts I and HI, and native laccase. The better performance of catalyst II with respect to catalyst III might be reasonably explained by the highest dispersion of laccase and by the presence of a double layer of enzyme. Catalysts II-III showed a higher activity than, or comparable to, that of most of the immobilized systems previously studied. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据