Methylene blue removal by adsorption on unmodified and modified wood sawdust

Adsorption, as an easy and effective technique, is widely used to remove a large number of dyes from aqueous solutions. Activated carbon the most desirable adsorbent, but due its high cost, use limited. Proving possibility adsorption efficiency performed on cheap adsorbents great challenge interest many researchers in past few decades. In this paper, unmodified (P) modified sawdust obtained two ways (HCl treatment NaOH treatment), labeled PHCl PNaOH, are for removal methylene blue dye. Adsorption experiments showed that optimal time different, sample PNaOH – 30 min, P 45 60 min. By applying nonlinear kinetic models experimentally data, it was found best model describes pseudo-second-order model. examining effect pH values adsorption, different results were (for samples value pH=11, wider range values). The analysis adsorbent dose process dye decreases with increasing mass adsorbents. coefficient determination Freundlich's (PNaOH) indicate multilayer type adsorption. For sample, neither Langmuir nor Freundlich adequately described MB