Factors affecting photocatalytic degradation of Reactive Green-19 with CdO-TiO2 nanocomposite

Zope, Gaurav; Goswami, Ajayagiri; Kulkarni, Sunil; Meshram, Pawan

doi:10.22104/aet.2021.5140.1395

Factors affecting photocatalytic degradation of Reactive Green-19 with CdO-TiO2 nanocomposite

Document Type : Research Paper

Authors

¹ University Institute of Chemical Technology, Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon, Maharashtra, India

² Gharda Institute of Technology, Lavel. Maharashtra, India

10.22104/aet.2021.5140.1395

Abstract

Cdo-TiO₂ nanocomposites were synthesized by varying the molar ratio of CdO: TiO₂ as 1:1, 1:2, and 2:1 using the sol-gel method. The pH value for all the CdO-TiO₂ nanocomposites was controlled at two different values, pH-3 and pH-13. The nanocomposites were used for facilitating photolytic degradation of azo dye (Reactive Green-19). The surface morphology, crystallinity, and properties related to interactions with the light of the prepared catalyst were examined by scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and ultraviolet-visible (UV-Vis) spectrophotometer, respectively. The nanocomposites for all molar ratios synthesized at pH-3 showed rod-like structure and some irregular shapes, while those synthesized at pH-13 were spherical. From XRD patterns, composites at pH-3 and pH-13 were crystalline; however, those at pH-3 were more crystalline. The parameters, namely initial dye concentration, pH of dye solution, and catalyst concentration, affecting photocatalytic activities were examined and optimized at 75 ppm, pH-7.5, and 1g/L, respectively. The progress of the degradation process of Reactive Green-19 was observed by monitoring the change in the concentration of the dye after a certain time interval by measuring the absorbance by UV-Vis spectrophotometer. Catalyst A1:1 (The nanocomposites obtained at pH-3 with 1:1 mol% of CdO:TiO₂) showed maximum degradation (94.53 %) at a catalyst concentration of 1 g/L.

Keywords

Main Subjects

Photocatalysis and Photoreactors

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