ABSTRACT
This study investigated the sorption behaviour of modified extracted cellulose (MEC) from Stipa Tenacissima L by cetyltrimethyl ammonium bromide to improve adsorption capacity for the removal of methyl orange (MO) dye from aqueous solutions. Physico-chemical characterisation of extracted material was performed by pHPZC determination, SEM, DSC, XDR and FTIR. The pHPZC occurred around a pH of 4.2. The effect of pH, contact time, MO concentration, adsorbent dosage, ionic strength and temperature on adsorption was presented. The results showed that it was in favour of adsorption at pH = 3.7 with 0.2 g/50 mL. Modelling study shows that the pseudo-second-order kinetic model and Langmuir adsorption isotherm model provide better fitness to the experimental data and the maximum adsorption capacity was 16.94 mg/g at 25°C. Calculated thermodynamic parameters ∆G0, ∆H0 and ∆S0 showed that adsorption is spontaneous and exothermic, and the possible mechanism controlling MO adsorption on the MEC is related to electrostatic and hydrophobic interactions.
Disclosure statement
The authors declare that they have no known conflict of interest or personal relationships that could have appeared to influence the work reported in this paper.