Technical Session - 1

Title:            Catalytic ozonation of nonyl phenol ethoxylates in water by octahedral molecular sieve (OMS-2)
Authors:      T. T. Tran Truong, M. M. T. Nguyen, T. Vo Huu, K. Nguyen, D. T. Nguyen, H. Nguyen Ngoc
Abstract:     In the present work the nonionic surfactant nonyl phenol ethoxylate (NPE) is used as the target polutant and its degradation in the ozonation process and cryptomelane-type manganese oxide of octahedral molecular sieve structure (OMS-2) catalytic ozonation was studied. OMS-2 material was synthesized by refluxing method. Characterisation of OMS-2 was made using XRD patterns and TGA profile. Nitrogen adsorption-desorption measurement gives BET specific surface of the catalyst is of 72 m2 /g. The influence of pH, initial NPE concentration, ozonation time and the amount of catalyst in ozonation process was also investigated. Results show that NPE removal by using OMS-2 is higher than that of using single ozonation. More than 95% NPE were removed within 10 min at pH of 11 at 30oC with an amount of OMS-2 catalyst of 0.1 g/L. Furthermore, in this condition 39% of total carbon of NPE was mineralized.

Keywords:  Nonyl Phenol Ethoxylate, Catalyst, Ozonation, OMS-2, Mineralisation
Pages:        081-086

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