PROMOTED HYDROLYSIS OF SOME ORGANOPHOSPHATE ESTERS USING SUPPORTED [Cu(tmen)OH(OH2)]+

Authors : Murat Erdem

Pages : 720-732

Doi:10.18038/aubtda.318087

View : 10 | Download : 7

Publication Date : 2017-09-30

Article Type : Research Paper

Abstract :In this study, tetramethylethylenedimine copperinsert ignore into journalissuearticles values(II); complex insert ignore into journalissuearticles values(Cuinsert ignore into journalissuearticles values(tmen);Cl 2 ); was synthesized and natural clay smectite and synthetic Dowex-50WX8 resin containing Cuinsert ignore into journalissuearticles values(tmen);insert ignore into journalissuearticles values(OH);insert ignore into journalissuearticles values(OH 2 ); + were prepared via ion exchange process in aqueous solution. Dowex- and smectite-supported Cuinsert ignore into journalissuearticles values(tmen);insert ignore into journalissuearticles values(OH);insert ignore into journalissuearticles values(OH 2 ); + were used as a promoter in the hydrolysis reactions of organophosphate compounds of diethyl- p -nitrophenyl phosphate and p -nitrophenyl diphenyl phosphate at different pH values. Scanning electron microscope attached with energy dispersive X-ray dedector and surface area analyzer were used for the characterization of the promoters. The efficiency of these promoters was evaluated in accordance with pseudo-first-order and Michaelis-Menten enzyme kinetic models. The amount of copperinsert ignore into journalissuearticles values(II); complex in Dowex-supported promoter was higher than that of smectite-supported one insert ignore into journalissuearticles values(1.36 mmol/g and 0.88 mm ol/g, respectively); and the higher efficiency was obtained when Dowex-supported promoter was employed in all of the hydrolysis reactions. 222 and 114-fold increasing in pseudo-first-order rate constants compared to the reactions without promoter were observed for the hydrolysis of diethyl- p -nitrophenyl phosphate at pH 8.0 in the presence of Dowex-supported and smectite-supported promoters.
Keywords : Dowex 50WX8, Smectite, Tetramethylethylenedimine copper II, complex, Diethyl p nitrophenyl phosphate