Abstract

GUZMAN GRIJALVA, Héctor Manuel; ALVARADO IBARRA, Juana; ZAMARRON PULE, Martín Francisco  and  ESQUER PERALTA, Javier. Removal of Eriochrome Black T from water using a chitosan/zeolite composite: a kinetic study. Biotecnia [online]. 2021, vol.23, n.3, pp.158-166.  Epub Mar 07, 2022. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v23i3.1479.

A composite material was prepared using chitosan and chabazite for the removal of Eriochrome T black dye from water. Scanning electron microscopy (SEM) analyses showed chabazite particles embedded in the chitosan matrix. Thermogravimetric analyses indicated that chitosan degrades chemically at temperatures above 225 °C; chabazite only experiences weight decrease due to moisture loss. Fourier transform infrared spectroscopy (FTIR) analyses on chitosan detected the presence of O-H, N-H, C-H, C-N and C-O bonds, protonated amino groups and saccharides. In chabazite, H2O molecules, T-O and O-T-O groups, where “T” corresponds to Si or Al atoms, isolated H-bonded O-H groups, and Si-O-Si groups were detected. In kinetic experiments, an 86 % decrease of the dye concentration in solution was achieved in approximately 500 minutes. The linearization method was used to evaluate the fit of the experimental data with the pseudo-first-order, pseudo-second order, Elovich and intra-particle diffusion adsorption kinetic models. The kinetic experiments showed that the sorption mechanism corresponds to a pseudo-second order model.

Keywords : adsorption; composite; chitosan; chabazite; kinetic model.