Hydrolysis of semi mustard (S.M) by MnCo2O4 (MnO-Co2O3) nanocomposite as a binary oxide catalyst: kinetics reactions study

Abstract

MnCo2O4 (MnO-Co2O3) nanocomposite as a binary oxide has been successfully prepared by precipitation method using cobalt nitrate and manganese nitrate as the precursors and then characterized by scanning electron microscopy-energy dispersive micro-analysis (SEM-EDX) and X-ray diffraction (XRD) techniques. In this work, we report the hydrolysis kinetics reactions of semi mustard (chloroethyl ethyl sulfide (CEES)/S.M), a mimic of bis (chloroethyl) sulfide (i.e. sulfur mustard) that were carried out on the surface of MnCo2O4 nanocomposite as a destructive sorbent catalyst and were performed using GC-FID and GC-MS instruments. The effect of different parameters including solvent type and reaction time on the reaction efficiency were investigated. GC-FID analysis results emphasized that the maximum hydrolysis of CEES was related to n-hexane nonpolar solvent after the elapse of the reaction (12 h) at room temperature (25±1°C) with a 95% yield. On the other hand, minimum hydrolysis was reported for methanol polar solvent under similar conditions. The rate constant and half-life (t1/2) have been calculated 6.91×10-6 s-1 and 6.98×10-5 s-1, and 105 s and 9.9×103 s for methanol and n-hexane solvents, respectively. Also, Data explore the role of the hydrolysis product, i.e. hydroxyl ethyl ethyl sulfide (HEES) in the reaction of CEES with MnCo2O4 nanocomposite and GC-MS analysis was applied to identify and quantify semi mustard destruction product.