Catalytic activity of magnetic iron oxide nanoparticles for hydrogen peroxide decomposition: optimization and characterization

Abstract

BACKGROUNDThe present study is focused on the decomposition of hydrogen peroxide (H2O2) using magnetic iron oxide nanoparticles (Fe3O4 NPs). Intrinsic peroxidase mimicking activity of Fe3O4 NPs helps in decomposition of H2O2 for the generation of •OH radicals during the Fenton process. A response surface methodology based central composite design (CCD) method was adopted to optimize five different process parameters: reaction time, temperature, pH, Fe3O4 NP concentration and H2O2 concentration.RESULTSCCD‐predicted H2O2 decomposition (%) showed close agreement with the experimental results, confirming the good fit of the experimental data to the model. A maximum H2O2 decomposition of 92.31% was achieved with an initial H2O2 concentration of 31.07 mg L−1, Fe3O4 NPs of 1.34 wt%, pH of 5.29, temperature of 23.1 °C and reaction time of 5.6 min as optimal values. The morphology and structure of Fe3O4 NPs before and after the reaction process were characterized using scanning electron microscopy, energy‐dispersive X–ray spectroscopy, Fourier transform infrared spectroscopy, X‐ray diffraction spectroscopy and thermogravimetric analysis.CONCLUSIONThe characterization data showed no significant changes in the structure of Fe3O4 NPs after the reaction compared to the pristine Fe3O4 NPs. The catalytic efficiency of these NPs was found to be in close agreement with other similar materials reported in previous literature. These optimization variables for H2O2 decomposition using Fe3O4 NPs may be useful in designing protocols for practical application at a large scale. © 2020 Society of Chemical Industry

Biosynthesis of a Therapeutically Important Nicotinamide Mononucleotide through a Phosphoribosyl Pyrophosphate Synthetase 1 and 2 Engineered Strain of Escherichia coli

“…NMN production was influenced not only by NAM concentration but also by concentrations of inorganic phosphate, Mg 2+ , and ribose, which can be further explained in regard to the 3D surface plot (Figure ). These 3D plot surfaces have been presented in terms of a graphical description of the regression equation and normally applied for better perception of the correlation among the variables within the range considered . The maximum response variable values can be noticed by the consign space of the lower contour plot or the highest peak of the surface plot.…”

“…The ANOVA of the linear, quadratic, and interaction coefficient in sections of F value and p value is listed in Table . The obtained F value and p value display the relevance of individual and synergistic process parameter effect through the response variables . A 3D surface plot was obtained to illustrate the visualization of the combination effect of two independent variables on NMN production.…”

Upcycling discarded cellulosic surgical masks into catalytically active freestanding materials

“…These artificial enzyme-like analogs are easy and cheap to manufacture, offer improved catalytic stability and remain stable under harsh physicochemical conditions in comparison with natural enzymes such as globular proteins (Jiang et al 2019 ). Among the different nanoparticles that mimic the catalytic activity of enzymes such as peroxidase, oxidase, catalase, haloperoxidase, and others (Wei and Wang 2013 ; Liang and Yan 2019 ), Fe 3 O 4 nanoparticles are specially attractive given their intrinsic ability to oxidize organic substances (Chen et al 2012 ; Gao et al 2017 ; Maharjan et al 2020 ). After its discovery, other metal oxides such as CoO x have shown similar activity (Mu et al 2012 ; Guo et al 2020 ), and opened the way to new types of enzyme-like activities.…”

Degradation of Acid Red 1 Catalyzed by Peroxidase Activity of Iron Oxide Nanoparticles and Detected by SERS

“…Iron oxide nanoparticles have also been supported on various porous materials to improve their efficiency in heterogeneous Fenton-like catalysis [11]. Other studies have used ultrasonic radiation to improve the degradation efficiency of dyes [12]. The peroxidase-like activity of magnetite nanoparticles to generate hydroxyl radicals, in particular, has been extensively studied in the degradation of molecules [13].…”