This work undertakes the study of the detoxification reactions of O, S-dimethyl phosphoramidithioate (methamidophos) as an organophophorus insecticide on the 14.7 wt% magnetite (Fe3O4) nanoparticles/Ag-NaY faujasite molecular sieve zeolite (FMSZ) composite. The influence of solvent (methanol, acetonitrile and n-hexane) on the detoxification potential of composite was inves...

This work undertakes the study of the detoxification reactions of O, S-dimethyl phosphoramidithioate (methamidophos) as an organophophorus insecticide on the 14.7 wt% magnetite (Fe3O4) nanoparticles/Ag-NaY faujasite molecular sieve zeolite (FMSZ) composite. The influence of solvent (methanol, acetonitrile and n-hexane) on the detoxification potential of composite was inves...

mntio3-zeolite-y nanocomposites were synthesized with 5-10-20% (w/w) of mntio3 by stearic acid gel method. then, the gels were calcined at 900 °c for 4 hours and the resulted spectra were investigated at 20% (w/w) concentration. also, the presence of rhombohedral phase of mntio3 in zeolite-y matrix was confirmed by xrd, sem, edx and bet. the vsm results showed the antiferromagnetic properties f...

NaY zeolites with different framework Si/Al ratios were synthesized via hydrothermal technique. Structural characteristics of the synthesized zeolites were determined by using XRD, XRF, SEM, BET analyses. The effects of operating conditions of hydrothermal dealumination, i.e. time, temperature and partial pressure of water vapor on dealumination of the Y zeolites framework and their structure w...

Discharge of organic substances into air has been strongly prohibited since some decades ago, to preserve comfortable natural environment. Though hydrocarbons, alcohols and chlorinated hydrocarbons had been used as the degreasing agent in industries, these solvents may also affect to our environment, and it is necessary to remove them from air as much as possible. This study was performed aimin...

INTRODUCTION Air pollution in confined environments is a serious health problem, in that most people spend long periods indoors (in homes, offices, classrooms etc.). Some people (children, the elderly, heart disease patients, asthmatic or allergic subjects) are at greater risk because of their conditions of frailty. The growing use of air-conditioning systems in many public and private building...

Nanosized zeolite crystals (nanozeolites) with narrow particlesize distributions and sizes less than 100 nm have received much attention because of their great potential applications in catalysis and adsorption. The decrease in the crystal sizes results in high external surface areas, reduced diffusion path lengths, and more exposed active sites. For example, small Y-type zeolite crystals have ...

In heterogeneous catalysis transition metal-containing zeolites, in particular copperexchanged zeolites, have been studied experimentally [1, 2] as well as theoretically. Zeolites have large surface areas and different active sites (Brønsted acid sites and transition metal centers) which play a significant role in catalysis. In order to study the catalytic oxidation of benzene to phenol using d...