Synthesis and Characterization of Nonstoichiometric Cobalt/ CNT Nano Particles for Multifunctional Applications

Abstract

The present work aims to synthesize 70% cobalt / 30% multiwalled carbon nanotube (MWCNT) nanocomposites with enhanced physical properties. The structural and magnetic properties of the Co 1.5 Fe 1.5 O 4 /MWCNTs are reported. Structural, morphological properties of the nano composites are characterized by XRD, HR-TEM, Raman, and XPS techniques. XRD and HR-TEM investigations support the development of a single-phase cubic spinel structure of Co 1.5 Fe 1.5 O 4 confined on the exterior surfaces of MWCNTs. The measurements using a vibrating sample magnetometer (VSM) revealed ferrimagnetic nanocomposites. Heavy metal intrusion into the water system is a global environmental problem. Using Co 1.5 Fe 1.5 O 4 /MWCNT nanocomposites, the current study seeks to eliminate trace elements, including copper (Cu) and zinc (Zn). The main advantages of the synthesized samples include their high ad-sorption, amazing recycling efficiency, low cost, and simplicity of separation. Finally, one can conclude that the CNTs/ Co 1.5 Fe 1.5 O 4 is superior to other ad-sorbents in terms of effectiveness, sustainability, and environmental impact.

Reduced A–B super exchange interaction in zirconium doped cobalt ferrite due to laser irradiation

“…Likewise, a high spin state is the tendency for Fe 3+ (3d 5 ) and Fe 2+ (3d 6 ) at the B site, and the same for Fe 3+ (3d 5 ) at the A site [2]. Our magnetization data and charge as well as cation distribution of TM ions in A/B sites suggest that both Co 2+ and Co 3+ ions in B sites are in high spin state.…”

“…Both spin states of Co 2+ (3d 7 ) and Co 3+ (3d 6 ) in B sites have been proposed to be in both low spin [56-58] and high spin states [2,59]. Meanwhile, Co 2+ (3d 7 ) ions in the A site tend to be in a high-spin state as shown in figure 8.…”

“…Recently, there has been significant interest in spinel nano-ferrites due to their appealing physical properties [1,2]. Spinel ferrites, among the most essential magnetic materials, are extensively employed in a variety of applications.…”

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

“…The Co 2p spectra (figure 7(c)) display peaks at 780.15 eV and 795.6 eV correspond to Co 2p 3/2 and Co 2p 1/2 , respectively, with two satellite peaks characteristic of Co 2+ [49]. The chemical state of cobalt as Co 2+ can be defined through the satellite peak of 786.17 eV ruling out the presence of Co 3+ .…”