Removal of Reactive red 120 from aqueous solutions using cumin straw ash

Synthetic dyes are used in various industries. This textile industry is one of the largest producers of organic compounds and dyes. So that, their treatment conditions are complicated and difficult. . They are often toxic, carcinogenic, teratogenic, and non-biodegradable.  In the present study, peanut hull was used as a low cost adsorbent for the successful removal of Reactive red 120 dye from aqueous solutions. This research is an experimental study the effect of various operating parameters such as pH (2-12), reaction time (5-180 min), amount of adsorbent dosage (0.1-1.4 g/l) and initial concentration of dye (10-200 mg/l) on dye removal from synthetic wastewater were studied. Also the adsorption behaviour of dyes by isotherms of Freundlich and Langmuir and synthetic of adsorption were conducted using excel program and regression coefficient. The findings of this study were showed that Maximum removal efficiency of Reactive red 120 achieved at optimal pH 3, reaction time 90 min, adsorbent dosage 0.8 g/l and initial dye concentration 10 mg/l. When the concentration is from 10 to 200mg/l increase removal efficiency from 91.08% to 60.03% decrease. Data of this study was fitted with Langmuir and Freundlich isotherms and more fitted with Freundlich (R=0.988). More than 95% removal efficiency for (Rr120) dye showed that this adsorbent is an effective natural compound and also inexpensive for treatment processes. Hence, using this technique and process was recommended for dye pollutants removal from aqueous environments.