Fabrication and characterization of pure and modified Co3O4 nanocatalyst and their application for photocatalytic degradation of eosine blue dye: a comparative study

Abstract

The present work deals with the synthesis of cobalt oxide, and Fe 2+-and Ni 2+-doped cobalt oxide nanoparticles as a catalyst. The study is investigating the different factors in obtaining cobalt oxide, and Fe 2+-and Ni 2+-doped cobalt oxide nanoparticles. Photocatalytic degradation studies are carried out for water-soluble eosine blue (EB) dye using cobalt oxide, and Fe 2+-and Ni 2+-doped cobalt oxide nanoparticles in aqueous solution. Different parameters such as initial dye concentration, dose of catalyst, contact time and pH have been studied to optimize reaction conditions. It is observed that photocatalytic degradation is a more effective and faster mode of removing EB dye by cobalt oxide, and Fe 2+-and Ni 2+-doped cobalt oxide nanoparticles than work done before. The optimum conditions for the removal of the EB dye are initial concentration 40 mg/L, photocatalyst dose 0.8 g/L, and pH 7.5. The EDS technique gives the elemental composition of synthesised cobalt oxide, and Fe 2+-and Ni 2+-doped cobalt oxide nanoparticles. The TEM and XRD studies are carried for morphological feature characteristics of synthesized cobalt oxide, and Fe 2+-and Ni 2+-doped cobalt oxide nanoparticles. Pseudo-first-order kinetic has been investigated for both pure and doped cobalt oxide catalysts. Almost 95% dye degradation has been observed for doped cobalt oxide nanoparticles.

Novel Copper-Zinc-Manganese Ternary Metal Oxide Nanocomposite as Heterogeneous Catalyst for Glucose Sensor and Antibacterial Activity

“…The efficiency of the photocatalyst decreased with the increasing concentration of the dye. The efficiency was indirectly proportional to the concentration of the dye [ 57 ]. The rate constant (k) corresponding to 50, 75, and 100 µM was found to be 0.01089, 0.00953, and 0.009 and the linear regression coefficient (R 2 ) corresponding to 50, 75, and 100 µM was found to be 0.8554, 0.9661, and 0.9758 ( Figure 13 ).…”

Electrical Behaviors of the Co‐ and Ni‐Based POMs Interlayered Schottky Photodetector Devices

“…This can be interpreted as that the main composition of the shell structures of POM is widely distributed throughout the structure. [34,35] In order to visualize the enhanced surface roughness of the two compounds containing different transition metals, representative AFM images obtained under similar magnifications are examined. Figure S2 (Supporting Information) shows the AFM images of the POMs.…”

α-Cellulose-based films: effect of sodium lignosulfonate (SLS) incorporation on physicochemical and antibacterial performance

“…Cellulose, as one of the three main ingredients in lignocellulosic biomass, is a famous biopolymer and has great potential for preparing lm-based materials (Khalili et al, 2018;Koli et al, 2018;Zhang et al, 2017). The properties of bio-compatibility, exibility, chemical modi cation, and universal applicability make cellulose-based lms promising to be utilized in elds of wastewater treating, wound healing, Recently, the regenerated cellulose lm derived from regenerated method is a promising alternative to polymeric one (Puspasari et al, 2018).…”