Abstract
A highly sustainable method for the preparation of supported iron oxide and copper nanoparticles (NPs) on a biomass-derived carbon by solvent-free mechanochemical process is reported. In-situ mechanochemically obtained extracts from orange peel could behave as a green reducing agent, allowing the formation of Cu metal nanoparticles as well as generating a magnetic phase (magnetite) in the systems via partial Fe3+ reduction. At the same time, orange peel residues also served as template and carbon source, adding oxygen functionalities, which were found to benefit the catalytic performance of mechanochemically synthesized nanomaterials. The series of magnetic Cu-Fe@OP were tested in the oxidation of trans-ferulic acid towards vanillin, remarkably revealing a maximum vanillin yield of 82% for the sample treated at 200 °C.
Highlights
Synthetic vanillin, currently produced from petro-based intermediates, possesses a remarkable value as flavoring agent in cosmetic, pharmaceutical, food, and fine chemical industries
Considering the above-mentioned premises, we report a one-pot synthesis of carbon-supported bimetallic Cu and Fe NPs, via in-situ mechanochemical extraction from orange peel wastes
A novel and sustainable protocol has been designed for the preparation of bimetallic supported nanoparticles, by employing orange peel as template and carbon source, while the in-situ mechanochemically obtained extracts favor the formation of metallic Cu [18]
Summary
Currently produced from petro-based intermediates (glyoxylic acid and guaiacol), possesses a remarkable value as flavoring agent in cosmetic, pharmaceutical, food, and fine chemical industries. Trans-ferulic acid is a non-toxic phenolic compound, highly abundant in lignocellulosic biomass, being a suitable candidate as feedstock for vanillin production [4]. Heterogeneous catalytic strategies employing nanomaterials, such as metal and metal oxides, have been explored for the transformation of trans-ferulic acid into vanillin [5]. In this regard, Cu based nanoparticles (NPs) have been widely investigated due to their chemical and physical properties, besides the earth-abundant and inexpensive characteristics of this metal [6]. The design of bimetallic nanocatalysts, by adding a second metal, could lead to tunable
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