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Shiv Nadar University

Mg-Co-Zn nanoferrites of composition MgxCo0.5Zn0.5Fe2−xO4 (x = 0.25, 0.5, 0.75 and 1.0) were successfully synthesized by using a citrate precursor method. After synthesis, the samples were examined using different techniques for structural, morphological, electrical and dielectric characterizations. All the samples were found to have single phase spinel cubic structure with Fd-3m space group in the X-ray diffraction spectroscopy (XRD) investigation. The value of average crystallite size ranged from 37 to 47 nm with the increase in Mg ion concentration from x = 0.25 to 1.0. The hopping lengths at tetrahedral and octahedral sites showed an increasing behaviour with increasing magnesium ion concentration. The presence of tensile strain in the samples was confirmed by W-H plots. The dielectric behaviour of the prepared nanoferrites was recorded at room temperature in the frequency range 10 kHz–10 MHz. The real part and imaginary part of the dielectric constant were found to be in the range 3.80–7.93 and 0.0036–0.644 at 1 MHz frequency and the value of loss tangent was 0.00095–0.081 at 1 MHz for the magnesium doped Co-Zn nanoferrites. The value of loss tangent decreased very sharply to remarkably low values at 10 MHz frequency. The dc resistivity value was found very low in the range 3.2 × 108 Ω-cm to 4.0 × 109 Ω-cm for different concentrations of Mg2+ ions in the samples. Due to such low losses at high frequency region and high value of dc resistivity, these materials can be considered as potential candidate for high frequency applications. © 2021 Elsevier B.V.

World University root node

Life Sciences

(SoNS) School of Natural Sciences

Journal of Magnetism and Magnetic Materials

Influence of Mg doping on the structural, electrical and dielectric properties of Co-Zn nanoferrites

We report the synthesis of Ca-doped Mg–Zn ferrite Mg0.4Zn(0.6-x)CaxFe2O4 nanomaterials with x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6 through citrate precursor approach and their structural, morphological, optical, photocatalytic, and antimicrobial properties were systematically studied. The prepared nanoferrites's cubic spinel structure with an average crystallite size of 15–38 nm was evaluated by the XRD examination. The spherical morphology of these ferrite nanoparticles was seen from scanning electron microscopy (SEM). The observed bands at 560 cm−1 and 406 cm−1 in the FTIR spectra confirmed the spinel structure of the synthesized nanoferrite. The optical study confirmed an optical band gap of 1.60 eV–1.86 eV. The photocatalysis was done for the degradation of rhodamine B dye solution under UV light. All the synthesized nano ferrites displayed a promising antimicrobial potential upon Candida albicans fungi. Mg0.4Zn0.1Ca0.5Fe2O4 nanoparticles have a better photocatalytic response (99.5%) for the degradation of rhodamine B dye and show superior antimicrobial activity (96.1%) for the inhibition of Candida albicans fungi. © 2022 Elsevier Ltd and Techna Group S.r.l.

Ceramics International

Nano Ca–Mg–Zn ferrites as tuneable photocatalyst for UV light-induced degradation of rhodamine B dye and antimicrobial behavior for water purification

Bisphenol A (BPA) is a known endocrine disruptor with estrogen-like effects, which causes damage to human organs. BPA can affect the immune, reproductive, and neuroendocrine systems and is also carcinogenic. Herein, highly selective electrochemical sensing of BPA using H+-exchanged α-MnO2 in water under room conditions was developed. H+-exchanged α-MnO2 was synthesized via ion exchange. The synthesized material was characterized using an X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS), which confirms a successful synthesis of 1-D H+-exchanged α-MnO2. A nano-enabled, label-free electrochemical sensor was fabricated by employing synthesized materials. The sensor prominently showed high sensitivity of 0.64 kΩ/nM/mm2 and a lower limit of detection (LoD) of 16 nM. The equivalent Randel circuit was modeled for electron transfer kinetics evaluation. Additionally, the shelf life analysis confirmed the stability and reproducibility of the designed sensor over 30 days. Moreover, the sensor is highly selective toward BPA against other organic compounds. So, H+-exchanged α-MnO2-based BPA sensor provides a feasible and novel avenue to detect BPA in water under ambient conditions for health safety purposes. © 2001-2012 IEEE.

IEEE Sensors Journal

Enhanced Bisphenol A Sensing in Water Using 1-D H+Exchanged α-MnO2-Based Impedimetric Sensor

Removal of heavy metals (Cd and Cr) from industrial wastewater by adsorption onto a series of Ca substituted nickel zinc nanoferrites (CaxNi0.4Zn0.6-xFe2O4 (x = 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6)) (CNZNFs) was studied in detail. The effect of calcium doping and contact time over adsorption of cadmium and chromium ions was investigated and maximum uptake of Cd (98.25%) and Cr (51%) ions were marked by prepared nanoadsorbents. Structural studies confirmed the formation of spinel structured nanoparticles with crystallite size ranging from 24 to 38 nm while porosity was observed to vary from 52% to 58% with calcium concentration. Pseudo second order (PSO) kinetic model for adsorption of both heavy metals (cadmium and chromium) was observed to be better fitted with adsorption data. Maximum adsorption efficiencies for Cd (128.20 mg/g) and Cr (23.54 mg/g) were found by the data fit of Langmuir isotherm model. Additionally, the adsorption data was found to obey Langmuir isotherm model for both heavy metals due to higher values of correlation coefficients (R2 = 0.94131 for cadmium and 0.91091 for chromium) than Freundlich isotherm model (R2 = 0.5865 for cadmium and 0.4599 for chromium). © 2022 Elsevier Ltd and Techna Group S.r.l.