_____________________________________________________________________________________________________ *Corresponding author: E-mail: ikemusifoh@gmail.com; International Research Journal of Pure & Applied Chemistry 18(2): 1-10, 2019; Article no.IRJPAC.46913 ISSN: 2231-3443, NLM ID: 101647669 Adsorption of PB(II) Ions from Aqueous Solution Using Functionalized and Carbonized Groundnut Shell Ikemefuna Usifoh 1* , Rosemary Odinigwe 1 and M. U. Obidiegwu 1 1 Department of Polymer and Textile Engineering, School of Engineering and Engineering Technology, Federal University of Technology, Owerri, P.M.B. 1526, Nigeria. Authors’ contributions This work was carried out in collaboration between all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/IRJPAC/2019/v18i230085 Editor(s): (1) Dr. Richard Sawadogo, Group Cell death & Natural Compounds, Laboratoire de Biologie Moléculaire et -Cellulaire du Cancer Hôpital Kirchberg, Luxembourg. Reviewers: (1) Farid I. El-Dossoki, Port-Said University, Egypt. (2) Yongchun Zhu, Shenyang Normal University, China. Complete Peer review History: http://www.sdiarticle3.com/review-history/46913 Received 23 October 2018 Accepted 30 January 2019 Published 27 February 2019 ABSTRACT Groundnut shells were modified through functionalization and carbonization processes to produce three distinct adsorbents for adsorption of Pb (II) ions from aqueous solution. Adsorption studies was carried out under varying conditions of pH, contact time, adsorbent dosage, metal ion concentration and temperature after the results were documented. Batch adsorption experiments revealed that the adsorbents performed optimally at a pH of 11 and the adsorption process was dependent upon changes in contact time. Adsorption capacity was observed to increase with increase in adsorbent dosage and decrease with increase in lead ion concentration across all adsorbents. Highest metal ion removal was by the GS-KOH C where 239.86 mg/g of lead ion was removed from the aqueous solution followed by the GS-HCL C at 228.0750 mg/g and then the GS- TPP adsorbent was least at 179.1235 mg/g. Keywords: Lead; groundnut shell; adsorption; adsorbent; adsorption capacity. Original Research Article