University Of Tehran Press Pollution 2383-451X 7 3 2021 07 01 Efficient Removal of Toxic Textile Dye using Petiole Part (Stem) of Nymphaea alba 643 656 82533 10.22059/poll.2021.314204.943 EN Abul Kalam Md. Lutfor Rahman Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh 0000-0001-7258-3506 Aparna Sarker Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh 0000-0003-0899-679X Nafees Ahmed Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh 0000-0002-4339-966X Marufa Mustofa Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh Abdul Awal Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh 0000-0003-2889-5128 Journal Article 2021 01 24 The removal of toxic textile dye, Congo red (CR) an azo based textile dye, was investigated from aqueous solution by low cost, eco-friendly available adsorbents such as petiole part (stem) of water lily (<em>Nymphaea alba</em>) under various experimental conditions.Batch experiment was carried out at varying pH, dye concentration, contact time and particle size as well as doses of the adsorbent. CR was analyzed by a UV-visible spectrophotometer. Optimum pH was found at pH 2 and 6. A relative study was done using sodium chlorite and formaldehyde treated water lily. The maximum removal of CR was obtained 94.68% using untreated water lily (UT-WL). Adsorption increased with the increase of the particle size of the adsorbent. The highest removal of CR was found at a lower dose (62.5 g/g) of the adsorbent. The Freundlich isotherm model was best fitted to equilibrium data obtained from the experiment. The adsorption kinetics successfully fitted to the pseudo-second-order kinetic model. https://jpoll.ut.ac.ir/article_82533_53459541b995ae70047c433a1b7a6aa0.pdf