Trimesic acid coated alumina: An efficient multi-cyclic adsorbent for toxic Cu(II)

A comparative metal ion adsorption study by trimesic acid coated alumina: A potent adsorbent

“…For these experiments, the R L was found to be 0.009 for Fe 3+ and 0.357 for Fe 2+ , which reflects the favourability of Langmuir model for the both. In case Cu 2+ adsorption studied previously [12], isotherm data was also found to be fitted well with Langmuir model. In addition, the Chi-square test was also done for …”

“…The equilibrium uptake (q e ) for Fe 2+ decreased from 4.6 mg/g to 2.6 mg/g when the initial Fe 2+ was decreased from 100 mg/L to 40 mg/L. In our previous study [12] with Cu 2+ , it was found that equilibrium reached within 120 min. Hence, adsorption process of Fe 3+ and Fe 2+ is quite faster than Cu 2+ .…”

“…Thus, it can be said that the mixed ions has a tendency to precipitate earlier compared to each of their individual solutions. In our previous study of Cu 2+ adsorption [12], maximum adsorption capacity was ∼11.0 mg/g at pH ∼5.0, while the precipitation of Cu 2+ started beyond pH 5.0.…”

“…Higher negative value of G 0 for Fe 3+ indicates a higher driving force compared to Fe 2+ . Adsorption of Cu 2+ onto TMA coated alumina [12] had an driving force of −12.8 kJ/mol at 25 • C, which is almost similar to Fe 2+ but much less than Fe 3+ . Moreover the Cu 2+ adsorption was found to be an exothermic process as the G 0 value decreased from −12.8 kJ/mol to −8.9 kJ/mol when the temperature increased from 25 • C to 50 • C [12].…”

“…Detail characterisation of the adsorbent was also done [12]. A series of adsorption experiments were performed in batch mode.…”