Heterogeneous kinetics of CuO nanoflakes in simultaneous decolorization of Eosin Y and Rhodamine B in aqueous media

Abstract

This study describes the heterogeneous photocatalysis of CuO nanoflakes for the effective degradation of hazardous dyes. The successful synthesis of CuO nanoflakes was carried out by exploiting aqueous chemical growth method. The synthesized material was characterized by versatile analytical tools including XRD, FE-SEM, EDX, AFM, ZP and FT-IR. The engineered CuO reveals nanoflakes texture having average size of 18.3 nm and (− 36.5 ± 3 mV) surface charge with excellent phase purity and crystalline nature. The catalytic kinetics exposed that CuO nanocatalyst exhibits an exceptional degradation over 97% for Eosin Y (EY) and Rhodamine B (RB) dyes in the aqueous medium using minimum catalyst dose of 120 and 140 μg individually and simultaneously, within 3 min of time period under sunlight. Due to ultrafine processing, cost-effective synthetic outline, supreme reduction percentage in short time and intense recyclability with an insignificant decrease in degradation abilities, the proposed nanocatalyst is extremely useful. Consequentially, the nanocatalyst presented here is more useful and realistic, hence can be suggested as an effective candidate for the successful degradation of complex dyes at the commercial level.

Biogenic Synthesis of CuO, ZnO, and CuO–ZnO Nanoparticles Using Leaf Extracts of Dovyalis caffra and Their Biological Properties

“…From the obtained micrographs of the CuO–ZnO, the nanocomposite contains several large numbers of densely packed particles without a definite shape, which is caused by agglomeration. On the other hand, the SEM micrograph of CuO nanoparticles in Figure 4 b showed that they are mostly composed of uniform nanoflakes that are aggregated in a repetitive pattern, with interconnected thin flakes similar to other report [ 46 ]. Additionally, the SEM micrograph of ZnO Nps in Figure 4 c shows densely stacked short hexagonal rod-like structures that are randomly distributed similar to earlier report [ 47 , 48 ].…”

“…However, both are found enmeshed in a flat matrix, which also brought about some agglomeration [ 49 ], perhaps due to the high temperature of calcination. The particle size of CuO nanoparticles obtained from the TEM micrograph was in the range of 30–50 nm [ 46 ].…”

CuO Nanorods Immobilized Agar-Alginate Biopolymer: A Green Functional Material for Photocatalytic Degradation of Amaranth Dye

“…Further, the energy band gap value is calculated by using Tauc’s plot equation given below [ 44 ]: where α is the absorption coefficient, h is Plank’s constant, v is frequency of different radiations, A is constant and n is constant (value depends on type of band transitions: ½ is direct transitions and 1 is indirect transitions). CuO has direct transition and the value of n is 1/2 [ 45 ]. The inserted graph in Figure 5 shows the graph relating (αhv) 2 and hv.…”

A Reusable Nickel Oxide Reduced Graphene Oxide Modified Platinum Electrode for the Detection of Linezolid Drug

“…The functionalization of this structure have been considered to be important for improving its properties. Consequently, various functional materials including organic, biological molecules, polymers, metal nanoparticles, transition-metal dichalcogenides, and metal-oxide nanoparticles have been widely explored to boost the physicochemical characteristics of rGO architecture. , Among these, the nanomaterials, especially metal and metal oxide, bimetallics, and carbon nanotubes (CNTs), are promising nanomaterials that exhibit wide applications in energy storage, sensors, adsorption, degradation, lithium ion batteries, and supercapacitors. − In addition, because of their strong catalytic characteristics, good stability, and affordable cost, various metal-oxide nanoparticles have drawn a lot of interest in developing nonenzymatic sensors. − Nickel oxide (NiO) nanoparticles is one of the fundamental n -type semiconductors with potential applications in many fields, including gas sensors, dry solar cells, lithium ion batteries, energy storage, and photocatalytic applications. − Consequently, it can be expected that the incorporation of NiO nanoparticles with GO produces synergistic effects for the improvement in the conductivity and catalytic activity of the rGO …”