Silane Based Novel Crosslinked Chitosan/Poly(Vinyl Alcohol) Membrane: Structure, Characteristic and Adsorption Behaviour

Abstract

In this study, crosslinked chitosan/poly(vinyl alcohol) membranes (CS/P) were prepared using methyltrimethoxysilane (MTMS) as crosslinker and tested for the removal of textile dyes (Nylosan red N-2RBL (NR) and palatine orange (POr). These membranes were characterized by Fourier transform infrared spectroscopy and results confirmed the presence of linkages between PVA and chitosan through MTMS. The high swelling of these membranes showed its hydrogel properties. Adsorption methodology was applied to find out the effects of the different variables, including contact time, pH, temperature and dye concentration. Under the optimal values of all parameters, the maximum dye removal was of 2.42 mmol/g (1230 mg/g) and 1.59 mmol/g (935 mg/g) for POr and NR, respectively. The kinetics modeling study of both dyes were best fitted by pseudo-first order equation. Furthermore, isotherm data followed the Langmuir isotherm model and thermodynamic parameters suggest that adsorption process was spontaneous and endothermic in nature. It is concluded that CS/P membranes had high adsorption capacity for POr and NR dyes, ecofriendly properties might be a suitable and efficient adsorbent for removal of dyes from textile solutions.