Abstract
As industrial effluents consisting of toxic organic dye molecules cause severe harms to humans and damages to the environment, the detoxification of industrial waste water becomes one of the priority areas to be considered by countries all over the world. In this context, the present study is focused on the synthesis of an eco-friendly nanocomposite SnO2:Mo/rGO to photo-catalytically detoxify dye effluents. The detoxifying efficiency of this photocatalytic nanocomposite prepared using the flower extract of Cassia fistula was examined by decomposing methylene blue (cationic-MB) and rose bengal (anionic-RB) dyes. The nanocomposite is found to be superior compared to its constituents (SnO2:Mo and rGO) for both MB (99 %) and RB (98 %) dyes. After treatment, the water was examined for its non-toxicity by supplying it for seed germination process using Cowpea seeds (Vigna unguiculata). The seed germination results clearly reveal that near complete detoxification of dye solution is achieved, when SnO2:Mo/rGO nanocomposite is used as photocatalyst. Thus, the SnO2:Mo/rGO nanocomposite synthesized using Cassia fistula flower extract can be considered as a potential photocatalyst for commercial dye detoxification processes.
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