| Autor: |
Bankole MT; Department of Chemistry, Federal University of Technology, PMB.65, Minna, Niger State, Nigeria. bankole.temitope@futminna.edu.ng.; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria. bankole.temitope@futminna.edu.ng., Abdulkareem AS; Department of Chemical Engineering, Federal University of Technology, PMB.65, Minna, Niger State, Nigeria.; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria., Mohammed IA; Department of Chemical Engineering, Federal University of Technology, PMB.65, Minna, Niger State, Nigeria.; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria., Ochigbo SS; Department of Chemistry, Federal University of Technology, PMB.65, Minna, Niger State, Nigeria., Tijani JO; Department of Chemistry, Federal University of Technology, PMB.65, Minna, Niger State, Nigeria.; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria., Abubakre OK; Department of Mechanical Engineering, Federal University of Technology, PMB.65, Minna, Niger State, Nigeria.; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria., Roos WD; Department of Physics, University of the Free State, P.O. Box 339, ZA-9300, Bloemfontein, Republic of South Africa. |
| Abstrakt: |
This research investigated the removal of heavy metals (As, Pb, Cr, Cd, Ni, Cu, Fe, and Zn) via batch adsorption process from industrial electroplating wastewater using two different nano-adsorbents; purified carbon nanotubes (P-CNTs) and polyhydroxylbutyrate functionalized carbon nanotubes (PHB-CNTs), both produced through catalytic chemical vapour deposition (CCVD) method. HRSEM, HRTEM, XRD, DLS, BET, FTIR, XPS, TGA, pH drift and Raman spectroscopy were used to characterize the developed nano-adsorbents. In the batch adsorption process, the effects of contact time, dosage, temperature and pH were studied. Both nano-adsorbents gave optimum contact time, equilibrium time, optimum dosage, and pH of 10 minutes, 70 minutes, 20 mg, and 5.63-5.65 respectively. The heavy metals removal efficiencies by the nano-adsorbents followed the order of PHB-CNTs > P-CNTs based on ion exchange and electrostatic forces mechanism. For P-CNTs and PHB-CNTs, the equilibrium sorption isotherm suits temkin model, kinetic data fitted to pseudo-second order based on the linear regression correlation coefficient, and the thermodynamic study established spontaneity and endothermic nature of the adsorption process. The findings in this research conclude that both nano-adsorbents have exceptional capacity to remove heavy metals from the adsorbate, with PHB-CNTs possessing better quality. The treated adsorbate meets the standard for industrial or irrigation re-use. |
