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Schematic illustration of green synthesis approach of ZnO and TiO2 nanoparticles (NPs) and their application. The number of publications on green synthesis of ZnO and TiO2 NPs from 2010 to 2020 (internet search of Scopus on 10 March 2021). Keywords searched: ZnO + Green Synthesis and TiO2 + Green Synthesis.
