Equilibrium Isotherm Study for Removal of Mn (II) from Aqueous Solutions by Using Novel Bioadsorbent Tinospora cordifolia

The removal efficiency of Tinospora cordifolia from manganese containing aqueous solutions was investigated. The effect of adsorbent dosages, pH of solution, initial Mn (II) concentration and contact time was investigated using a batch adsorption technique. The optimum pH for Mn (II) adsorption was found as 4.0 for T. cordifolia. Results were analyzed by the Langmuir and Freundlich isotherm models using linearized correlation coefficient. The characteristic parameters for each isotherm have been determined. The Langmuir model agrees very well with experimental data than the Freundlich isotherm model. According to Langmuir isotherm, the monolayer saturation capacity (Qmax) was 24.69 mg/g at temperature (25±2°C). The FT-IR analysis indicated the involvement of hydroxyl (-OH), aliphatic (-C-H), and carbonyl group (C=O) chelates in metal binding. The biomass was then used for the removal of Mn (II) in synthetic and real wastewater samples from a coal-mine acid industrial wastewater. This study indicated that the biomass of T. cordifolia can be used as an effective and environmental friendly adsorbent for the treatment of Mn (II) containing aqueous solutions.