title: Oxidation of methyl methacrylate from semiconductor wastewater by O3 and O3/UV processes.
abstract: This study investigated the oxidation of methyl methacrylate (MMA) by sole ozonation and ozone/UV treatments. The semi-batch ozonation experiments were proceeded under different reaction conditions to study the effects of ozone dosage and UV radiation on the oxidation of MMA. The experimental results indicated that both the oxidation of MMA by the sole ozonation and O3/UV processes can completely decompose MMA to form the following intermediates within 30 min reaction time. To increase the applied ozone dosage can significantly raise the removal efficiency of MMA. However, the mineralization of MMA via the direct oxidation reaction of molecular ozone was slow, while introducing the UV radiation can promote the mineralization rate of MMA. In addition, the pH value of the oxidized solution in the O3/UV treatment decreased lower than that in the sole ozonation treatment of about 1 unit. The possible scheme of the decomposition pathway of MMA under the ozonation process is proposed in this study. Formic acid and acetic acid were found to be the main ozonated intermediates.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan. shangnc@ntu.edu.tw
authors.forename: Neng-Chou
authors.initials: NC
authors.lastname: Shang
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Chen
authors.forename: Hwong-Wen
authors.initials: HW
authors.lastname: Ma
authors.forename: Chi-Wei
authors.initials: CW
authors.lastname: Lee
authors.forename: Cheng-Hsin
authors.initials: CH
authors.lastname: Chang
authors.forename: Yue-Hwa
authors.initials: YH
authors.lastname: Yu
authors.forename: Chien-Hsien
authors.initials: CH
authors.lastname: Lee
mesh_terms: D019342:Acetic Acid; D005561:Formates; D007220:Industrial Waste / Q000517:prevention & control*; D020366:Methylmethacrylate / Q000737:chemistry* / Q000528:radiation effects*; D010084:Oxidation-Reduction; D010126:Ozone; D010782:Photolysis; D012666:Semiconductors; D014466:Ultraviolet Rays
chemical_list: D005561:Formates; D007220:Industrial Waste; C030544:formic acid; D020366:Methylmethacrylate; D010126:Ozone; D019342:Acetic Acid