Efficient removal of La(III) from water by surface metal sequestration methodology using 5-azo-phenolate-8-hydroxyquinoline as a task designed sequestering material

The present work explores an efficient depositive removal process of La(III) by 5-azo-phenolate-8-hydroxyquinoline (5AP-8HQ) using surface metal sequestration methodology (SMSM). Structural characterization of La(III)-complex was confirmed by different techniques. The highest surface coverage value 1597.4 mu g/cm(2) was recognized using pH 6.0, 0.01 mol L-1 La(III) and 76 cm(2) surface area. The depositive removal of La(III) followed the Freundlich isotherm model (R-2 = 0.9972) and the values of thermodynamic parameters assured spontaneous and endothermic processes. Furthermore, among the four investigated kinetics models, pseudo-second-order model (K-2 = 1.15 g/mg min) yielded the best fit to describe the removal experimental data of La(III). (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.