Kinetic Investigation on the Hydrolysis of BNPP Catalysedby N-Methyl diethanolamine-Ce~(3+ )Complex

The mathematical model of the catalytic reaction of the ternery complex as M_(m)L_(l)S was proposed in this paper. The thermodynamic and kinetic parameters of the catalytic reaction can be obtained by this method. The hydrolysis of phosphate diester(BNPP) catalyzed by Ce~(3+)complexes was studied kinetically at pH7.20,T=(30±0.1)℃.The effect of Brij35and CTAB surfactants on the hydrolysis of phosphate diester(BNPP) catalyzed by Ce~(3+)complexes was also studied in this paper. The thermodynamic and kinetic parameters of the above-mentioned catalytic reactions were obtained by the mathematical model presented in the paper. The results indicated that the activated hydroxyl group of the ligand is effective nucleophilic species in the hydrolytic reactions. The results showed that the rate for the hydrolysis of phosphate diesterwereincreased 70 ～150 folds, which was caused by metal complex and the concentration effect of surfactant micelle is greater catalyst for the hydrohytic cleavage of phosphate diester