Dendrimer functionalized nanoarchitecture: Synthesis and binary system dye removal

In this paper, dendrimer functionalized titania nanoarchitecture (DFTN) was synthesized and characterized. The ability of DFTN to remove dyes from single and binary systems was studied. Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) were used to characterize DFTN. Direct red 23 (DR23), direct green 6 (DG6), and direct red 31 (DR31) were used as anionic dyes. The effect of adsorbent dosage, pH, dye concentration, and salt on dye removal was evaluated. Kinetic, isotherm, and thermodynamic of dye removal were evaluated. The capacity of DFTN to remove DR23, DG6, and DR31 was 244, 189, and 243 mg/g, respectively. Dye removal kinetics and isotherm using DFTN fitted with the pseudo-first order kinetics and Langmuir, respectively. The thermodynamic data indicated the dye adsorption onto adsorbent is spontaneous, endothermic, and physical adsorption. (C) 2013 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.