Magnetic Biochar-Supported Pd Nanoparticles as a Peroxidase-Like Catalyst

• Published in: Waste and biomass valorization 2022, Vol.13 (8), p.3629-3637
• Main Authors: Lopes, Renata Pereira, Guimarães, Tiago, Moro, Marta Martinez, Guisasola, Eduardo, Moya, Sergio, Astruc, Didier
• Format: Article
• Language: English
• Subjects: Agribusiness; Catalysts; Charcoal; Coffee; Engineering; Environment; Environmental Engineering/Biotechnology; Hydrogen peroxide; Industrial Pollution Prevention; Iron oxides; Nanocatalysis; Nanoparticles; Natural resources; o-Phenylenediamine; Original Paper; Oxidation; Palladium; Peroxidase; Phenylenediamine; Pyrolysis; Renewable and Green Energy; Synergistic effect; Waste Management/Waste Technology
• ISSN: 1877-2641; 1877-265X
• DOI: 10.1007/s12649-022-01740-x

Catalytic supports from natural resources such as biochar are highly appealing for ecological and economic reasons. Here, biochar from pyrolysis of coffee husk, an agribusiness residue, was used as support in the design of a Pd–Fe 3 O 4 -based nanocatalyst applied as H 2 O 2 sensor. The oxidation of o -phenylenediamine by H 2 O 2 was favorably catalyzed at pH 3 with synergistic effects between the magnetized biochar and palladium nanoparticles. Using the Michaelis–Menten model, values for V max of 19.5 × 10 –8  M s −1 and K m of 2.41 mM were recorded for this oxidation reaction. The detection limit for H 2 O 2 was 0.82 µM. It is concluded that magnetized biochar-supported Pd–Fe 3 O 4 nanocatalyst can be used as a valuable hydrogen peroxide sensor. Graphical abstract