Biologically Reduced Zinc Oxide Nanosheets Using Phyllanthus emblica Plant Extract for Antibacterial and Dye Degradation Studies

Abstract

The nanostructures synthesized using the green chemistry method have recently attracted the attention of scientists due to their significance in many scientific domains. This work provides an overview of the biosynthesis of zinc oxide (ZnO) nanosheets (NSs) using Phyllanthus emblica plant (PEP) extract. X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) were used to analyze the synthesized ZnO-NSs. Evaluation of the antibacterial activity of biosynthesized ZnO-NSs was performed. ZnO-NSs exhibit effective antibacterial activity against Gram-positive (S. pyogenes and S. aureus) and Gram-negative (S. typhi and E. coli) bacterial strains. S. typhi is the most sensitive microbe towards ZnO-NSs and formed a 21 mm zone of inhibition (ZOI). ZnO-NSs are also tested as a photocatalyst in the degradation of methyl orange (MO) and rhodamine B (RB). The degradation rate of MO was 90%, and RB was 96% after being exposed to UV light for 120 min. The as-synthesized ZnO-NSs exhibited selective dye degradation and showed relatively better photocatalytic activity for positively charged (cationic) dyes. This work could lead to the fabrication of high-yield photocatalysts, which have the potential to degrade textile dyes from aqueous solution.

The Impact of Different Green Synthetic Routes on the Photocatalytic Potential of FeSnO2 for the Removal of Methylene Blue and Crystal Violet Dyes under Natural Sunlight Exposure

“…The presence of vibration peaks at 3200-3300 cm −1 show the OH group present in the plant extracts (Figure 2a,b). The peak at 2930 cm −1 represents the existence of an alkane group (C-C), while the peaks at 2216, 2187,1618, 1401, 1073, 1000 and 872 cm −1 are due to the presence of a C=N bond, thiocyanate, C=O stretching (quinone), a C=C bond, alkyl substituted ether, C-O stretching and aromatic rings due to phytochemicals present in plants extract, respectively [34,35].…”

“…an alkane group (C-C), while the peaks at 2216, 2187,1618, 1401, 1073, 1000 and 872 cm −1 are due to the presence of a C=N bond, thiocyanate, C=O stretching (quinone), a C=C bond, alkyl substituted ether, C-O stretching and aromatic rings due to phytochemicals present in plants extract, respectively [34,35]. Moreover, the bond length (R) of Sn-O and Fe-O was determined using FTIR data by applying Badger's formula and force constant k (dynes.cm −1 ), as shown in Equations ( 1) and (3).…”

Optimization of physical and dielectric properties of Co-doped ZnO nanoparticles for low-frequency devices

“…The polarization mechanism with an external field is responsible for this phenomenon. Maxwell-Wagner model and the Koop's phenomenological theory have both been used to explain the dielectric actions of synthesized nanoparticles [30][31][32]. Koop postulated that crystals have two layers: grains and grain boundaries, with the former serving as a good conductor at low frequencies and the latter being a poor conductor.…”

Defects oriented hydrothermal synthesis of TiO2 and MnTiO2 nanoparticles as photocatalysts for wastewater treatment and antibacterial applications

“…The optical absorption of TiO 2 is limited to the UV region due to its wide bandgap, which results in low photocatalytic activity under visible light irradiation [ [16] , [17] , [18] ]. It is believed that the photocatalytic activity of TiO 2 can be significantly enhanced by depositing or doping suitable semiconductor metal oxides, noble metals, transition metal ions, or nonmetal ions into or onto the TiO 2 structure [ 19 , 20 ]. Various strategies have been developed to modify the TiO 2 properties and to address its limitations, including doping with transition metal ions [ 21 ].…”