Rose bengal dye is extensively used in the textile and photochemical industries as well as its presence in aquatic environment through industrial effluents cause severe toxic effects on the human health, aquatic life and to the environment. Therefore, in the present study, an attempt has been made to remove the rose bengal dye where it adsorbed on the surface of the adsorbent i.e. ZnO nanoparticles synthesized by aqueous stem extract of Arisaema tortuosum and separated by centrifugal method. The synthesized nanoparticles were characterized by UV-Visible, XRD, FTIR SEM and TEM techniques that confirmed the formation of zinc oxide in the nanorange. Finally, change in concentration of rose bengal dye in the aqueous medium after removal by centrifugal method was estimated by quantitative analysis using UV-Vis spectrophotometer. The parameters studied were adsorbent dosage, adsorbate dosage and contact time. The results have shown that ZnO NPs were very efficient to remove the rose bengal dye pollutant from aqueous medium which may find huge application in the wastewater treatment.

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