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- Title
Removal of heavy metal ions from aqueous solution using Populus nigra sawdust-based activated carbon.
- Authors
Salman, Syed Muhammad; Kamal, Fouzia; Zahoor, Muhammad; Wahab, Muhammad; Shahwar, Durre; Khan, Hizb Ullah; Badshah, Syed Lal; Shah, Syed Nusrat; Sadia, Maria; Kamran, Abdul Waheed
- Abstract
In this study, an activated carbon (AC) was prepared from Populus nigra sawdust and was used to remove Cd(II), Cr(VI) and Pb(II) ions from aqueous media. Instrumental techniques such as Fourier transform infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis, X-ray diffraction, energy dispersive X-ray and surface area analysis were used to characterize the prepared adsorbent. Batch adsorption experiments were conducted to enumerate the adsorption parameters and get optimum conditions for the effective adsorption of the selected heavy metals. The equilibrium data were evaluated through Freundlich, Langmuir, Temkin, Jovanovic and Harkins-Jura isotherm models. The Langmuir model best fitted the equilibrium data with high values of R2. Pseudo-first order, pseudo-second order, power function, intraparticle diffusion, and Natarajan-Khalaf models were used to evaluate the experimental kinetics data. Pseudo-second order model amongst them was found to be the best to fit the data well with high regression constant values of 0.9923, 0.9932 and 0.99112, respectively for Cr(VI), Cd(II) and Pb(II) sorption on AC. The thermodynamic parameters such as ΔH°, ΔS° and ΔG° were estimated for the sorption of selected heavy metals on AC, using Van′t Hoff equation. From the estimated values of the mentioned parameters, it was inferred that the sorption of these metals on AC is favourable, spontaneous and exothermic in nature.
- Subjects
ACTIVATED carbon; HEAVY metals; WOOD waste; BLACK poplar; FOURIER transform infrared spectroscopy techniques; METAL ions; AQUEOUS solutions; THERMOGRAVIMETRY
- Publication
Desalination & Water Treatment, 2021, Vol 221, p239
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.27048