Indian Journal of Natural Sciences www.tnsroindia.org.in ©IJONS Vol.12 / Issue 69 / December / 2021 International Bimonthly (Print) ISSN: 0976 – 0997 36546 A Miniaturized Biosorption-Desorption Process for Removal of Pb (II) Ions from Wastewater Using Biosorbent of Tectona grandis Leaves Ankita Negi*, R. Kumar, S. K. Joshi and N. S. Bhandari Department of Chemistry, Soban Singh Jeena Campus Almora, Kumaun University, Nainital, Uttarakhand, India. Received: 14 Oct 2021 Revised: 22 Oct 2021 Accepted: 02 Nov 2021 *Address for Correspondence Ankita Negi Department of Chemistry, Soban Singh Jeena University, Almora, 263601, Uttarakhand, India. Email: ankitanegi701@gmail.com This is an Open Access Journal /article distributed under the terms of the Creative Commons Attribution License (CC BY-NC-ND 3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. All rights reserved. Heavy metal ion contamination is increasing by the day, degrading the quality and reliability of water on both the surface and beneath. This research focuses on the reduction of Pb (II) ions from wastewater employing Tectona grandis leaves as a biosorbent (TGLB). Variations in pH (2-7), contact time (20- 120min), biosorbent dose (1-5g), temperature (298-338K), and initial metal ion concentration (10-50mg/ l) were used to investigate the adsorption procedure. A Pb (II) ion solution with a purity of 10 mg/L resulted in 93.93% of maximal removal with TGLB at optimum pH 6 and temperature 298± 1.5K for a biosorbent dose of 5gm and a 45minute contact period. The adsorption was spontaneous and exothermic, with TGLB yielding a maximum monolayer adsorption of 7.35 mg/g. The adsorption of Pb (II) ions by TGLB followed pseudo-second-order kinetics (R 2 > 0.998). Hydrochloric acid has a strong potential as an eluent for desorption of Pb (II) ions, according to the desorption experiments. The findings suggested that TGLB might be employed as an efficient and cost-effective biosorbent for the removal of Pb (II) ions. The spectroscopic assessment was done using Fourier transform infrared (FT-IR) analysis, whereas the morphological characterization was accomplished using Scanning electron microscope (SEM) images. Keywords: Biosorption, isotherm, optimum, removal, wastewater. INTRODUCTION Water purity deterioration is a crucial impediment to long-term sustainability and a grave danger to the ecosystem. Extensive study on management of various water sources and pollution abatement has been motivated by global population increase, industrialization, and the quest of the latest technological innovations. Contaminants in untreated industrial wastes, including heavy metal ions, degrade the integrity of the water resources. Since they can ABSTRACT RESEARCH ARTICLE