Acid-functionalized magnetic nanocatalysts mediated pretreatment of sugarcane straw: an eco-friendly and cost-effective
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ORIGINAL RESEARCH
Acid-functionalized magnetic nanocatalysts mediated pretreatment of sugarcane straw: an eco-friendly and cost-effective approach Avinash P. Ingle . Rafael Rodrigues Philippini . Yasmin Cristhine de Souza Melo . Silvio Silve´rio da Silva
Received: 6 April 2020 / Accepted: 21 May 2020 Ó Springer Nature B.V. 2020
Abstract The ubiquitous nature of lignocellulosic biomass on planet earth and its economic viability attracted a great deal of attention from researchers and becomes foremost feedstock for biofuel production particularly bioethanol. However, due to complexity in structure, its pretreatment is essentially required prior to actual use. In the present study, a promising approach has been proposed through the development of acid-functionalized magnetic nanocatalysts. Two different acid-functionalized magnetic nanocatalysts i.e. alkylsulfonic acid functionalized magnetic nanoparticles (Fe3O4-MNPs-Si-AS) and butylcarboxylic acid functionalized magnetic nanoparticles (Fe3O4-MNPs-Si-BCOOH) were developed and their efficacy was studied in the pretreatment of sugarcane straw at varying concentrations (100, 200, 300, 400, 500 mg/g of straw). The enhanced concentration dependent production of sugar (xylose) was reported in case of both the nanocatalysts. The maximum 17.06 g/L for Fe3O4-MNPs-Si-AS and 15.40 g/L for Fe3O4MNPs-Si-BCOOH sugar was reported at 500 mg
which is comparatively higher than normal acid (H2SO4) (14.63 g/L) and non-treated (0.24 g/L) sugarcane straw. Further, both the nanocatalysts were recovered by applying an external magnetic field and reused for the next two subsequent cycles of pretreatment. It was observed that with every reuse of nanocatalysts the concentration of sugar production was reduced. Moreover, generation of very less amount of toxic inhibitors was reported in the hemicellulosic hydrolyzate obtained in the present study. Considering these facts, it is believed that such nanocatalysts can be used as an effective, eco-friendly and economically viable alternative to the conventional pretreatment agents like mineral acids. Keywords Nanocatalysts Acid functionalized magnetic nanoparticles Lignocellulosic biomass Sugarcane straw Pretreatment Reuse
Introduction A. P. Ingle (&) R. R. Philippini Y. C. de Souza Melo S. S. da Silva (&) Department of Biotechnology, Engineering School of Lorena, University of Sao Paulo, Lorena, SP, Brazil e-mail: [email protected] S. S. da Silva e-mail: [email protected]
Nanotechnology is an emerging branch of science and has enormous potential to provide solutions for most complex issues in various fields. It is confirmed from the various studies that nanotechnology in general and nanomaterials, in particular, have huge applications in biorefineries for the production of biofuels and valueadded chemicals (Shuttleworth et al. 2014). Most of the conventional biorefining technologies currently in
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Cellulose
use are very old and hence, there is a great challenge of
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