Chitosan of low molecular weight was grafted on cotton gauze by ultraviolet radiations to produce a modified filtering substrate for removal of Cr (VI) metal ions from wastewaters. Different chitosan add-ons (2, 5 and 10 %wt.) were investigated and the surface of modified cotton was characterized by means of SEM and AFM. Batch adsorption tests were carried out under shaking at pH 3 and 20 °C. The experimental results were used to determine the adsorption kinetics order and the best fitting adsorption isotherm model (Langmuir, Freundlich or Dubinin-Radushkevich). A chitosan add-on between 5 and 10 %wt was found as optimal in order to use the majority of free active sites of chitosan on the surface.
Chromium adsorption by chitosan photografted cotton gauze for water filtration
RA Carletto;DO Sanchez Ramirez;F Truffa Giachet;C Tonetti;
2016
Abstract
Chitosan of low molecular weight was grafted on cotton gauze by ultraviolet radiations to produce a modified filtering substrate for removal of Cr (VI) metal ions from wastewaters. Different chitosan add-ons (2, 5 and 10 %wt.) were investigated and the surface of modified cotton was characterized by means of SEM and AFM. Batch adsorption tests were carried out under shaking at pH 3 and 20 °C. The experimental results were used to determine the adsorption kinetics order and the best fitting adsorption isotherm model (Langmuir, Freundlich or Dubinin-Radushkevich). A chitosan add-on between 5 and 10 %wt was found as optimal in order to use the majority of free active sites of chitosan on the surface.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
