Abstract

ADEWUYI, Adewale; VARGAS PEREIRA, Fabiano  and  ANUOLUWAPO ADEWUYI, Omotayo. Amine modified kaolinite clay from Nigeria: A resource for removing Cd²⁺ and Pb²⁺ ions from aqueous solution. J. appl. res. technol [online]. 2019, vol.17, n.2, pp.78-91.  Epub Apr 24, 2020. ISSN 2448-6736.  https://doi.org/10.22201/icat.16656423.2019.17.2.798.

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 to 24.41 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 and MKC showed a stable adsorbent-adsorbate configuration.

Keywords : Adsorption; Kaolinite clay; Heavy metal; Surface grafting; Wastewater treatment.

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