The catalytic ozonation of nonionic surfactant nonylphenolethoxylate (NPE) as pollutant in wastewater and its degradation in the presence of silica-supported Cobalt oxide nanoparticles was studied. Characterization of silica supported- cobalt oxide was made using XRD patterns and SEM profiles. | SCIENCE & TECHNOLOGY DEVELOPMENT, Vol 19, 2016 Removal of nonyl phenol ethoxylates in water by catalytic ozonation in presence of silica supported - cobalt nanoparticles Trong Tri Tran-Truong Mai My Thi Nguyen Hanh Nguyen-Ngoc - Email: nnhanh@ Thao Vo-Huu Ho Chi Minh City University of Technology, VNU-HCM (Manuscript Received on July, 2016, Manuscript Revised on September, 2016) ABSTRACT The catalytic ozonation of nonionic and catalyst contents in ozonation process was surfactant nonylphenolethoxylate (NPE) as pollutant in wastewater and its degradation in also investigated. Results show that NPE removals by using silica supported-cobalt oxide the presence of silica-supported Cobalt oxide nanoparticles was studied. Characterization of catalytic systems are higher than that of using single ozonation. About 99% NPE were silica supported- cobalt oxide was made using XRD patterns and SEM profiles. The influence removed within 10 min at 30oC. Furthermore, in this condition more than 50% of total carbon of of pH, initial NPE concentration, ozonation time NPE was mineralized. Keywords: nonyl phenol ethoxylate, catalyst, ozonation, Co 3O4, mineralisation 1. INTRODUCTION Nonyl phenol Ethoxylates (NPEs) are nonionic surfactants belongs to alkyl phenol ethoxylates family having structure as following: coatings, cleaners NPEs decomposes in strong bases, strong acids or strong oxidizing agents. The shorter length of ethoxylate chain, the more toxic NPEs are. The decomposition of NPE could produce hydrophobic NP, NP1EO, NP2EO having smaller biodegradation rate [1-2] and the carboxylic acid nonylphenols (NP2EC or NP1EC), NPEO having toxicity higher NPE. Commercial NPEs has n value being from 2 to 16. They are widely used in industrial production such as agriculture, leather, metal, petroleum, pulp and paper, paints, adhesives, Trang 50 Among the methods for treating NPE and other pollutants, ozonation and other .
