Helianthus annuus assisted green synthesis of Co₃O₄ and Ag‐Co₃O₄ and evaluation of their catalytic activities toward photodegradation of crystal violet dye

Abstract

Nowadays, plants assisted green synthesis of metal oxide nanoparticles attracted the interest of researchers due to economic and environmental points of view. This article reports the Helianthus annuus (sunflower) leaves assisted green synthesis of Co 3 O 4 and Ag-Co 3 O 4 particles. In this method, the leaves extract of Helianthus annuus (sunflower) is utilized as a reducing and stabilizing agent for the synthesis of Co 3 O 4 and Ag-Co 3 O 4 particles. XRD and FTIR confirmed the crystalline and spinel phase of prepared Co 3 O 4 and Ag-Co 3 O 4 particles. The catalytic activities of prepared particles were evaluated over the photodegradation of crystal violet dye under visible irradiation. About 63% and 98% of 100 mg/L degraded over 0.002 g/ml of Co 3 O 4 and Ag-Co 3 O 4, respectively. The reaction kinetics and mechanism were described in terms of the Eley-Rideal mechanism. The rate constant was determined as 0.0075 and 0.0167 per minute for Co 3 O 4 and Ag-Co 3 O 4, respectively.

Synthesis of a visible-light-driven Ag2O–Co3O4 Z-scheme photocatalyst for enhanced photodegradation of a reactive yellow dye

“…41–46 Additional diffraction peaks in the XRD pattern of Ag 2 O–Co 3 O 4 at 2 θ = 38.4°,and 65.4° indexed to (002) and (113) planes correspond to Ag 2 O. 47–53 It was observed that the incorporation of Ag 2 O reduced and shifted the characteristic peak of Co 3 O 4 . These results revealed the successful synthesis of the Ag 2 O–Co 3 O 4 heterostructure.…”

An overview of prominent factors influencing the photocatalytic degradation of cationic crystal violet dye employing diverse nanostructured materials

“…Saeed et al 89 employed Helianthus annus (sunflower) leaves to assist in the green synthesis of Co 3 O 4 and Ag-Co 3 O 4 nanoparticles. When exposed to visible light, the prepared particles' catalytic activities were assessed concerning the photodegradation of CV dye.…”

“…Saeed et al 89 . employed Helianthus annus (sunflower) leaves to assist in the green synthesis of Co 3 O 4 and Ag–Co 3 O 4 nanoparticles.…”

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

“…Environmental remediation of cobalt oxide-based nanocomposites or doped cobalt oxide nanoparticles includes the use of Co 3 O 4 nanoparticles as well as Co 3 O 4 nanoparticles doped with NiO and PdO/Pd as nano-catalysts to degrade methyl orange in the presence of sunlight [ 13 ], the photodegradation of crystal violet dye via Helianthus annuus leaf extract-synthesized Co 3 O 4 nanoparticles and Ag-Co 3 O 4 heterostructures [ 14 ], and the use of agar-immobilized Co 3 O 4 nanoparticles for the catalytic reduction of congo red, methyl blue, and 4-nitrophenol in the presence of sodium borohydride [ 15 ]. Xu et al demonstrated the use of the degradation of chloramphenicol using a biochar-supported Co 3 O 4 nanocomposite via peroxymonosulfate activation [ 87 ].…”

“…Co 3 O 4 nanoparticles have been used for applications such as energy storage, solar cells, capacitors, gas sensors, field emission materials, magneto-resistive devices, field effect transistors, and rechargeable Li-ion batteries [ 2 , 7 ]. They have also been used as photocatalysts for the degradation or adsorption of dyes and organic pollutants, as well as antimicrobial, antioxidant, and anticancer applications [ 2 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. The remediation potential of Co 3 O 4 nanoparticles is encouraging, since they are efficient in degrading pollutants that they have an affinity for and are also alternatives to the more expensive noble metals [ 1 ].…”