Adsorption Kinetics of Sulfates by Anion Exchange Resin Containing Pristine Multiwalled Carbon Nano Tubes
Since the documented discovery of carbon nanotubes (CNT) in 1991 by Iijima and the realization of their unique physical properties, including mechanical, thermal, and electrical, many investigators have endeavored to fabricate advanced CNT composite materials that exhibit one or more of these properties. The sulfates removal from synthetic water by High cross-linked polystyrene diviniyl benzene resin containing pristine multiwalled carbon nano tubes was studied at batch experiments in this study. The effect of pH, contact time, sulfates concentration and adsorbent dose on the sulfates sequestration was investigated. The optimum conditions were studied on Saline water as a case study. The results showed that with increasing of the absorbent amount; contact time and pH improve the efficiency of sulfates removal. The maximum sulfates uptake was obtained in pH and contact time 3.0 and 120 min, respectively. Also, with increasing initial concentration of sulfates in water, the efficiency of sulfates removal decreased. The obtained results in this study were matched with freundlich isotherm and pseudo second order kinetic. The maximum adsorption capacity (Xm or K) and constant rate were found 0.024 (mg/g) and 2.083 (mg/g.min), respectively. This study also showed that in the optimum conditions, the sulfates removal efficiency from Saline water by 0.1 mg/L sulfates was 85.64%. Eventually, High cross-linked polystyrene diviniyl benzene resin containing pristine multiwalled carbon nano tubes is recommended as a suitable and low cost absorbent to sulfates removal from aqueous solutions.
