Phytofabrication of iron nanoparticles and their catalytic activity

Abstract

Metallic nanoparticles that have photocatalytic activity can be synthesized using aqueous plant extracts. The aim of this study was to synthesize iron nanoparticles using Lantana trifolia extracts and to evaluate their ability to degrade Congo red dye. The nanoparticles were characterized using UV-Vis spectrophotometer (UV-Vis), Fourier transform infrared spectrophotometer, wide angle X-ray diffractometer, dynamic light scattering, transmission electron microscopy (TEM), and thermal gravimetric analyzer to determine the functional groups, thermal properties, crystalline phases and diameter distribution of the particles. Cyclic voltammetry was used to evaluate the redox potential of the extracts while photocatalytic activity of the nanoparticles was evaluated using a UV-Vis spectrophotometer. Functional groups analysis revealed presence of secondary metabolites having OH and C=C groups while a redox potential of + 0.3 V was an indication that the extracts can reduce iron. The presence of sharp peaks at 2θ values of 19.87°, 20.22°, 22.88°, 28.81°, 32.73°, 35.32°, 38.45°, 40.23° and 41.08° correspond to cubic crystal system of iron nanoparticles while particle aggregation was observed on TEM micrographs which also indicated that they were less than 200 nm. In the presence of H 2 O 2 , the nanoparticles catalyzed degradation of Congo red dye in a first order reaction that was temperature dependent. In conclusion, secondary metabolites in L. trifolia can reduce metallic ion to iron nanoparticles which can degrade Congo red dye.

Dimethyl Amine Detection using Polydiacetylene Functionalized Cellulose Paper

“…The samples were irradiated with a monochromatic CuKα radiation of 0.1542 nm and the diffractograms acquired between 2θ values of 5°– 90° at 0.05° intervals with a measurement time of 1 second per 2θ intervals [8] . The thermal profile of the nanocomposite was evaluated using a Mettler Toledo TGA/DSC 30 (Mettler‐Toledo GmbH, Switzerland) [26,28] . Approximately 5 mg samples were weighed into 40 μL aluminium crucibles which was then heated from 25–500 °C at 10 °C/min and cooled to 25 °C.…”

“…The IR spectra of the PDA‐ZnO nanosheets were acquired in the frequency range of 4000–400 cm −1 using a Bruker Tensor II FT‐IR spectrophotometer (Bruker, Ettlingen, Germany) [26,27] . The powder X‐ray diffractograms were acquired using a Bruker D8 Advance Diffractometer (Bruker, Ettlingen, Germany) operating a copper tube a voltage and current of 40 kV and 40 mA.…”

“…The IR spectra of the PDA-ZnO nanosheets were acquired in the frequency range of 4000-400 cm À 1 using a Bruker Tensor II FT-IR spectrophotometer (Bruker, Ettlingen, Germany). [26,27] The powder X-ray diffractograms were acquired using a Bruker D8 Advance Diffractometer (Bruker, Ettlingen, Germany) operating a copper tube a voltage and current of 40 kV and 40 mA. The samples were irradiated with a monochromatic CuKα radiation of 0.1542 nm and the diffractograms acquired between 2θ values of 5°-90°at 0.05°intervals with a measurement time of 1 second per 2θ intervals.…”

“…[8] The thermal profile of the nanocomposite was evaluated using a Mettler Toledo TGA/DSC 30 (Mettler-Toledo GmbH, Switzerland). [26,28] Approximately 5 mg samples were weighed into 40 μL aluminium crucibles which was then heated from 25-500 °C at 10 °C/min and cooled to 25 °C. Scanning electron micrographs of the nanocomposite were acquired using Tescan Mira3 LM FE scanning electron microscope (Tescan, Brno -Kohoutovice, Czech Republic) operating under an accelerating voltage of 3kV.…”

Synergistic Antifungal Activity of Dialdehyde Chitosan Loaded with Copper Metal‐Organic Framework (Cu‐MOF)

“…As detailed in our previously published work, [22] chitosan (Cs) was extracted from black soldier flies (BSF) exoskeleton by demineralization, deproteinization, decolorization, and deacetylation [26] and finally oxidized using potassium periodate. [27]…”