A novel synthesis protocol for Co₃O₄ nanocatalysts and their catalytic applications

Abstract

Green synthesis of Co3O4-NPs by a HPCM method using Azadirachta indica leaf extract is reported. HRTEM shows hollow sphere like NPs with polycrystalline nature and it is used in catalytic applications.

[Retracted] Solanum tuberosum Leaf Extract Templated Synthesis of Co3O4 Nanoparticles for Electrochemical Sensor and Antibacterial Applications

“…The white circular spots in the center of the SAED image correlated to the (111), (220), (311), and (222) and (400) lattice planes, which well matched with the obtained XRD results. As shown in Figure 4(d) , the major lattice plane (311) was calculated to be 0.25 nm and found to fit with the fringe spacing value, which is in good agreement with the previously reported work [ 31 ] and well agreed with the XRD value of 2 θ with 36.10. Figure 4(d) of HRTEM image also confirms the polynanocrystalline nature of Co 3 O 4 (1 : 1), and it has well-defined shape and visible grain boundaries, which can be achieved via a controlled synthesis procedure in the presence of bioactive molecules from the crude extract of Solanum tuberosum leaves.…”

Biosynthesis of Cobalt Oxide Nanoparticles - A Short Review

“…The biosynthesized Co3O4 nanoparticles have been used widely as photocatalyst, sensor, supercapacitor, enzyme inhibitor, antibacterial, antileishmanial and antioxidant applications. Photocatalytic degradation of textile dye waste (73.86% in 150 min), reduction of 4-nitrophenol and 4-nitroaniline and antibacterial activity applications of Azadirachta indica mediated Co3O4 nanoparticles were reported by Sivachidambaram et al [4]. Sharma et al reported electro-catalytic reduction of I3 − to I − ions in dye sensitized solar cells and thermal decomposition of ammonium perchlorate applications of Calotropis gigantea mediated Co3O4 nanoparticles [5].…”

Recent Trends and Advances of Co3O4 Nanoparticles in Environmental Remediation of Bacteria in Wastewater

“…The properties of Co 3 O 4 nanoparticles have been taken advantage of in environmental remediation applications, such as the degradation of dyes, dye waste, and antibiotics, similar to some applications of other nanoparticles. These include the photocatalytic degradation of hazardous dye waste in wastewater using Co 3 O 4 nanostructures synthesized with A. linearis leaf extract [ 12 ], the photocatalytic degradation of hazardous dye waste and the catalytic reduction of 4-nitroaniline and 4-nitrophenol using Co 3 O 4 nanoparticles synthesized with Azadirachta indica leaf extract [ 76 ], and methyl orange dye adsorption using Co 3 O 4 nanoparticles [ 77 ].…”

“…Both superoxide radical ions and hydroxyl radicals that come in contact with the cell wall of the bacteria disintegrate its proteins and lipids [ 1 ]. In a similar study, Co 3 O 4 nanoparticles were found to inhibit the growth of gram-positive bacteria ( Bacillus subtilis and Staphylococcus aureus ) and gram-negative bacteria ( Pseudomonas aeruginosa and Escherichia coli ) [ 76 ]. Using the disk diffusion method, the Co 3 O 4 nanoparticles inhibited the growth of all bacteria compared to a chloramphenicol standard.…”