AI Article Synopsis
- The removal of heavy metals (Cd(II), Pb(II), Hg(II), etc.) using carbon aerogel is influenced by factors like concentration, pH, temperature, and contact time.
- Both Langmuir and Freundlich isotherm models effectively describe how these metals are adsorbed on carbon aerogel, suggesting multiple layers of adsorption on the surface.
- The study also evaluates the kinetics of adsorption and thermodynamic parameters, indicating that this method could be a viable option for treating industrial wastewater.
Article Abstract
The removal of Cd(II), Pb(II), Hg(II), Cu(II), Ni(II), Mn(II) and Zn(II) by carbon aerogel has been found to be concentration, pH, contact time, adsorbent dose and temperature dependent. The adsorption parameters were determined using both Langmuir and Freundlich isotherm models. Surface complexation and ion exchange are the major removal mechanisms involved. The adsorption isotherm studies clearly indicated that the adsorptive behaviour of metal ions on carbon aerogel satisfies not only the Langmuir assumptions but also the Freundlich assumptions, i.e. multilayer formation on the surface of the adsorbent with an exponential distribution of site energy. The applicability of the Lagergren kinetic model has also been investigated. Thermodynamic constant (K(ad)), standard free energy (DeltaG(0)), enthalpy (DeltaH(0)) and entropy (DeltaS(0)) were calculated for predicting the nature of adsorption. The results indicate the potential application of this method for effluent treatment in industries and also provide strong evidence to support the adsorption mechanism proposed.
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| http://dx.doi.org/10.1016/j.jhazmat.2005.03.024 | DOI Listing |
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