Removal of a toxic basic dye-malachite green from aqueous solution by Onopordum turcicum Danin as natural biosorbent

Biosorption of malachite green (MG) was studies using natural origin adsorbent Onopordum turcicum Danin.Batch adsorption studies were carried out to evaluate the potentiality of O. turcicum for the removal of malachite greendye from wastewater, on different parameters such as pH, adsorbent dose, contact time and initial MG concentration.The effective pH was 8.0 for adsorption of MG by the biomass. The equilibrium isotherm was analyzed with theLangmuir and Freundlich models of adsorption. The biosorption data of MG on Onopordum turcicum Danin was fittedwith Langmuir model with a maximum adsorption capacity was 1110.1 mg/g. The acquired results show that O.turcicum was effective in removal of MG dye from aqueous solution.