Cr(VI) ions removal from a synthetic wastewater

In the present study, the Cr(VI) ion removal from synthetic wastewater utilizing sawdust as a rather inexpensive adsorbent studied by the batch adsorption technique. The sawdust physiochemical characterizations done through employing FTIR analyze. Standard Gibbs free energy (G ) equal to - 2.72 kJ/mol showed simultaneous mechanism. The standard free enthalpy changes (H ) equal to 34.67 kJ/mol revealed the endothermic nature of sorption process. The adsorption complied with pseudo-second order kinetics with Ksp=0.02 g/mg.min, qe=39 mg/g, R2=0.99. The adsorption parameters determined using an A-Priori Langmuir isotherm model. The Langmuir parameters a=45.25 mg/g and b=0.91 L/mg, indicated adsorption capacity and adsorption energy, respectively. Considering Langmuir model, the mono layer adsorption was confirmed.

Keywords:

adsorption , kinetics , sawdust , isotherms , thermodynamic