Removal of Mn(II) Ions from the Aqueous Solutions by Cotton Boll

Abstract

In this study, cotton boll was used as an adsorbent for the removal of the Mn (II) ions from the aqueous solutions. The adsorption process was carried out in a batch process and the effects of contact time (2–24 h), adsorbent dosage (1–20 g/l), initial pH (2.0–6.0), initial metal ion concentration (20–100 mg/l) and temperature (20–40°C) on the adsorption were investigated. Maximum adsorption capacity was determined at pH 5.0 and adsorbed Mn(II) ion concentration was increased with increasing adsorbent concentration and contact time. The isothermal data of cotton boll could be well described by the Langmuir equations and the Langmuir monolayer capacity had a mean value of 5.20 mg/g. Experimental results indicated that the pseudo-second order reaction model provided the best description of the data with a correlation coefficient 0.9898. The results of the study indicate that cotton boll can use as an effective low-cost adsorbent for the removal of the Mn(II) ions from the aqueous solutions and also Mn(II)-contaminated waters and wastewaters.