Abstract
Copper Oxide/Carbon nanocomposites (CuO/C NC) have been synthesized via a green strategy by using the aqueous leaf decoction of Vitex negundo Linn for its application in the degradation of Methylene Blue (MB), Coomassie Brilliant Blue (CBB), and Congo Red (CR) dyes. The characterization techniques such as FTIR, XPS, UV–Visible spectroscopy, FE-SEM, and Micro Raman were adopted to analyze the material's physicochemical characteristics and surface morphology. The UV-Visible spectrum exhibited a characteristic peak at 274 nm, and the FESEM analysis showed that the composites were nanoflakes of thickness less than 10 nm. The adsorption mechanism was elucidated by varying time, the dosage of adsorbent, concentration of dyes, and temperature. The Pseudo second-order kinetics and Langmuir isotherm model finely define the adsorption mechanism. The maximal adsorption capacity of the nanocomposites at room temperature for CBB, MB, and CR dyes is 9.09, 4.05, and 17.43 mg/g, respectively. The negative value of ΔG° showed the endothermic and spontaneous nature of adsorption. After a deep investigation on this particular topic, it has been assumed that this one is the maiden report on the adsorption of organic dyes using CuO/C NC synthesized by using V. negundo L. leaf extract.
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