Carbon sphere: Synthesis, characterization and elimination of toxic Cr (VI) ions from aquatic system

Carbon sphere has been newly prepared for the ejection of Cr(VI) ions. SEM-EDX, XRD and FTIR reports affirmed its quality. Trial and error analysis has been embraced to advance the system conditions. Langmuir maximum adsorption capacity (117.2 mg/g) was achieved at a pH of 2, adsorbent dosage of 4 g/L, contact time of 60 min and temperature of 30 degrees C for an initial Cr(VI) ion concentration of 50-500 mg/L. Adsorption process was controlled by surface diffusion. Pseudo-second order model was the best obeyed model. An exothermic and unconstrained sorption process was observed. Sticking probability explained that adsorption was favoured at low temperature. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.