Abstract:Pure CdO nanopowder and CdO-Fe 3 O 4 nanocomposite were synthesized by a cost effective chemical method, and the samples were characterized by XRD, SEM, TEM, FT-IR, UV-Vis-NIR and PL. Also, magnetic and photocatalytic properties of the synthesized samples were studied. XRD patterns of the composite confirm the presence of diffraction peaks related to both CdO and Fe 3 O 4 . EDX spectrum confirms the presence of the elements Cd, O and Fe in the composite. Peaks related to Cd-O and Fe-O bonds were observed respe… Show more
“…The FT-IR spectra (Figure 12) denote the attachment/ presence of arsenic with the increase in shifting of peaks around 797.89 cm À1 , 39,40 of lead around 682.4 cm À1 , 41 cadmium around 531.94 cm À1 , 42 944.60 cm À1 , 43 and chromium around 642.87 cm À1 , 44 thus providing evidence to our work.…”
Excess metal pollutant has affected and caused serious havoc in the lives of terrestrial as well as aquatic beings. The core of this work revolves around eradicating highly toxic heavy metal ions from underground water systems using a cost‐effective, high removal efficiency polymeric adsorbent capable of adsorbing and removing ionic metals whose backbone is composed of a bio‐degradable polymer, polyvinyl alcohol. The obtained adsorbent was characterized using FT‐IR, HNMR, and P‐XRD. Morphological studies were carried out using SEM. Detection and adsorption of metal ions were performed using SEM–EDX and AAS; wherein the adsorbent was found to remove nearly 80% of arsenic ions, 70.5% and 70.7% for lead and chromium ions while 60.7% for cadmium ions, respectively. Further, the kinetics of adsorption along with intraparticle diffusion studies were also performed to determine the mechanism alongside observing the isothermal influence of the sorbent. The adsorption capacity was seen to be highest in arsenic at around 570.42 mg g−1 thus acting as a potential and effective adsorbent for the removal of heavy metal ions from groundwater.
“…The FT-IR spectra (Figure 12) denote the attachment/ presence of arsenic with the increase in shifting of peaks around 797.89 cm À1 , 39,40 of lead around 682.4 cm À1 , 41 cadmium around 531.94 cm À1 , 42 944.60 cm À1 , 43 and chromium around 642.87 cm À1 , 44 thus providing evidence to our work.…”
Excess metal pollutant has affected and caused serious havoc in the lives of terrestrial as well as aquatic beings. The core of this work revolves around eradicating highly toxic heavy metal ions from underground water systems using a cost‐effective, high removal efficiency polymeric adsorbent capable of adsorbing and removing ionic metals whose backbone is composed of a bio‐degradable polymer, polyvinyl alcohol. The obtained adsorbent was characterized using FT‐IR, HNMR, and P‐XRD. Morphological studies were carried out using SEM. Detection and adsorption of metal ions were performed using SEM–EDX and AAS; wherein the adsorbent was found to remove nearly 80% of arsenic ions, 70.5% and 70.7% for lead and chromium ions while 60.7% for cadmium ions, respectively. Further, the kinetics of adsorption along with intraparticle diffusion studies were also performed to determine the mechanism alongside observing the isothermal influence of the sorbent. The adsorption capacity was seen to be highest in arsenic at around 570.42 mg g−1 thus acting as a potential and effective adsorbent for the removal of heavy metal ions from groundwater.
“…The XRD spectra of pristine and doped CdO samples, as depicted in Figure a, were performed to examine Fe influence on structural and phase composition analysis of host lattice CdO. Peaks situated at 2θ = 33.25, 39.02, 56.17, 65.96, and 68.92 were indexed to (111), (200), (220), (311), and (222) planes consecutively and match JCPDS# 73-2245 well . The XRD spectra presented cubic and polycrystalline structures of CdO and Cd 2+ , which may be replaced by Fe 2+ ions at octahedral coordination .…”
Section: Resultsmentioning
confidence: 91%
“…To analyze the chemical bond structure, the FTIR technique is the most common, which recorded spectra of pristine and doped samples in the 4000 to 500 cm –1 range, as shown in Figure d. The band nearby 680 cm –1 is ascribed to the Cd–O stretching vibration . The signal at 3420 cm –1 is related to the OH stretching vibration of atmospherically absorbed water molecules, while at 2355 and 1626 cm –1 , it attributes to the adsorbed CO 2 and C–O vibrations, respectively .…”
Cationic dyes present in industrial effluents significantly reduce the effectiveness of remediation operations. Considering the terrible impact of these pollutants on environment and biodiversity, investigating strategies to remove potentially harmful compounds from water is becoming an increasingly intriguing issue. In this work, we employed a simple hydrothermal technique to synthesize Fe-doped CdO (2, 4, and 6 wt %) nanostructures and assessed their efficacy in degrading methylene blue (MB) dye and inhibiting the growth of Staphylococcus aureus and Escherichia coli, respectively. Structural, morphological, and optical characterization of produced nanomaterials was also performed using X-ray diffraction, TEM, and UV absorption spectra. The photocatalytic decomposition of MB was significantly enhanced (58.8%) by using Fe (6 wt %)-doped CdO catalysts for 80 min under irradiation. In addition, 2.05−5.05 mm inhibitory zones were seen against Gram-positive bacteria (S. aureus), whereas the range for Gram-negative bacteria (E. coli) was 1.65−2.75 mm. These nanostructures were shown to be very effective inhibitors of beta-lactamase, D-alanine-D-alanine ligase B, and fatty acid synthase inhibitor by in silico molecular docking investigations.
“…The trapped electrons migrating into the valence band at the Ni interstitial are thought to be responsible for the strong violet emission peaks at 408 and 423 nm 40 . In CdO–NiO–Fe 2 O 3 nanocomposites, band gap defects such as oxygen vacancies were responsible for the weak blue emission peaks between 463 and 494 nm 56 , 57 . Figure 4 PL spectrum of CdO–NiO–Fe 2 O 3 nanocomposites at various molar ratio of Ni 2+ and Fe 3+ .…”
In this work, the effect of the molar ratio of (Ni2+ and Fe3+) on the properties of CdO–NiO–Fe2O3 nanocomposites was investigated. The synthesis of CdO–NiO–Fe2O3 nanocomposites was carried out by self-combustion. XRD, UV–Vis, PL and VSM were used to describe the physical properties of the materials. The results showed significant progress in structural and optical properties supporting antibacterial activity. For all samples, the particle size decreased from 28.96 to 24.95 nm with increasing Ni2+ content and decreasing Fe3+ content, as shown by the XRD pattern, which also shows the crystal structure of cubic CdO, cubic NiO, and cubic γ-Fe2O3 spinel. The Ni2+ and Fe3+ contents in the CdO–NiO–Fe2O3 nanocomposites have also been shown to enhance the ferromagnetic properties. Due to the significant coupling between Fe2O3 and NiO, the coercivity Hc values of the samples increase from 66.4 to 266 Oe. The potential of the nanocomposites for antibacterial activity was investigated against Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa, Escherichia coli, and Moraxella catarrhalis) bacteria. Comparison of P. aeruginosa with E. coli, S. aureus and M. catarrhalis showed that it has a stronger antibacterial activity with a ZOI of 25 mm.
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