Removal of Pb2+, Cu2+ and Cd2+ Metals from Simulated Wastewater in Single and Competitive System Using Locally Porcelanite
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 3, Issue 7
Abstract
The equilibrium uptake of lead (Pb2+), copper (Cu2+) and cadmium (Cd2+) ions, both singly and in combination, by locally Iraqi porcelanite rocks (PC) was studied in a batch system. The porcelanite rock was characterized using BET, and FTIR. Adsorption isotherms were developed for the single, and ternary-component systems and expressed by the mono- and multi-component Langmuir, Freundlich, Redlich–Peterson , Sips and khan models .The model parameters were estimated by nonlinear regression method using Statistica version-6 software. To understand the action of metals uptake, factors influencing the adsorption of the heavy metals including pH, initial metal ion concentration, weight of the adsorbent, mixing speed, contact time and temperature were investigated. It was found that the mono- and multi-component adsorption equilibrium data fitted very well to the Langmuir model with high determination coefficient (R2 ). The maximum loading capacity (qmax) was 76.104, 33.288 and 30.254 mg/g for Pb2+ , Cu2+ and Cd2+respectively. However, in ternary system the loading capacity decreased because of competition between ions to binding sites of adsorbent. Adsorption data were modeled using the pseudofirst and pseudo-second-order kinetic, Elovich and intraparticle diffusion models. It was seen that the pseudosecond-order kinetic equation could best describe the adsorption kinetics. Thermodynamic parameters showed that the adsorption of investigated heavy metals onto PC was exothermic, spontaneous in nature and the process is physiosorption. The Fourier Transform Infrared spectroscopy (FTIR) analysis indicated that carbonyl (C=O) and hydroxyl (–OH) groups in PC played an important role in the adsorption process. In conclusion, PC was found suitable as an abundant adsorbent for removal of the selected metal ions from aqueous solutions.
Authors and Affiliations
Noor J. Hamadi
Keywords
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