A study on adsorptive removal of DMAZ from aqueous solutions by ZSM-5, NaY zeolites, and activated carbon: kinetic and isotherm

Abstract

AbstractThe adsorptive removal of dimethyl amino ethyl azide (DMAZ) from aqueous solution by hydrothermally synthesized ZSM-5 and NaY zeolites as well as commercial activated carbon (AC) was studied. The effects of various parameters like the initial concentration of DMAZ, contact time, and adsorbent dosage on the DMAZ sorption yield were examined and the optimum experimental conditions were determined. The DMAZ adsorption efficiency of 60, 23, and 45% were obtained by ZSM-5, NaY zeolites, and AC, respectively. The experimental equilibrium data were analyzed by Langmuir and Freundlich isotherms. The Langmuir isotherm represented equilibrium data for NaY and ZSM-5 zeolites with regression coefficients (R2) of 0.974 and 0.971, respectively. The Freundlich isotherm revealed a better correlation for the commercial AC (R2 = 0.97). The experimental kinetic data were analyzed through pseudo-second-order model. It was observed that 15.04, 50.75, and 41.35 g of DMAZ could be removed by a unit mass of NaY zeolite, ...