Removal of methyl orange from aqueous solution onto modified extracted cellulose from Stipa Tenacissima L

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 pH_PZC determination, SEM, DSC, XDR and FTIR. The pH_PZC 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.

KEYWORDS:

• Methyl orange
• Stipa Tenacissima L
• modified extracted cellulose
• adsorption
• kinetics
• mechanism

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.