Amine modified kaolinite clay from Nigeria: A resource for removing Cd2+ and Pb2+ ions from aqueous solution

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Adewale Adewuyi
Fabiano Vargas Pereira
Omotayo Anuoluwapo Adewuyi

Abstract

Kaolinite clay (KC) obtained from redemption camp; Nigeria was modified by surface grafting and investigated for the removal of Pb2+ and Cd2+ ions from aqueous solution by adsorption. KC and the modified kaolinite clay (MKC) were characterized using X-ray Diffraction analysis (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analyzer, Fourier Transform Infrared spectrometer (FTIR), Particle Size Distribution (PSD), zeta potential, elemental analysis (CHNS/O analyzer) and Energy Dispersive Spectroscopy (EDS). Equilibrium, thermodynamics and kinetic studies were conducted by considering the effects of pH, initial metal ion concentration, contact time, adsorbent weight and temperature. Modification of KC increased its equilibrium adsorption capacity from 8.01 mg/g for Cd2+ and from 24.75 mg/g to 36.41 mg/g for Pb2+ ions. The adsorption process obeys Freundlich and Temkin isotherms. The adsorption was second-order-kinetic and controlled by both intra-particle and liquid film diffusion. Values of ΔGo, ΔHo, and ΔSo, for KC an MKC showed a stable adsorbent-adsorbate configuration.

 

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How to Cite
Adewuyi, A., Pereira, F., & Adewuyi, O. (2019). Amine modified kaolinite clay from Nigeria: A resource for removing Cd2+ and Pb2+ ions from aqueous solution. Journal of Applied Research and Technology, 17(2). https://doi.org/10.22201/icat.16656423.2019.17.2.798
Author Biographies

Adewale Adewuyi

Department of Chemical Sciences, Faculty of Natural Sciences, Redeemer's University, Mowe, Ogun state, Nigeria

Department of Chemistry, Federal University of Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil

Fabiano Vargas Pereira

Department of Chemistry, Federal University of Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil

Omotayo Anuoluwapo Adewuyi

Enviro Africa Limited, plot 182b Kofo Abayomi Street, Victoria Island, Lagos, Nigeria