Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 7 3 2021 08 01 Factors affecting photocatalytic degradation of Reactive Green-19 with CdO-TiO2 nanocomposite 185 194 1105 10.22104/aet.2021.5140.1395 EN Gaurav Zope University Institute of Chemical Technology, Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon, Maharashtra, India Ajayagiri Goswami University Institute of Chemical Technology, Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon, Maharashtra, India Sunil Kulkarni Gharda Institute of Technology, Lavel. Maharashtra, India Pawan Meshram University Institute of Chemical Technology, Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon, Maharashtra, India Journal Article 2021 10 01 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.  https://aet.irost.ir/article_1105_d08fd1b515df58b79760138b9b17768b.pdf