title: Decomposition of 2-naphthalenesulfonate in electroplating solution by ozonation with UV radiation.
abstract: This study investigates the ozonation of 2-naphthalenesulfonate (2-NS) combined with UV radiation in the electroplating solution. 2-NS is commonly used as a brightening and stabilization agent in the electroplating solution. Semibatch ozonation experiments were conducted under various reaction conditions to study the effects of ozone dosage and UV radiation on the oxidation of 2-NS. The concentrations of 2-NS were analyzed at specified time intervals to elucidate the decomposition of 2-NS. Total organic carbon (TOC) is chosen as a mineralization index of the ozonation of 2-NS. In addition, values of pH and oxidation reduction potential were continuously measured in the course of experiments. As a result, the nearly complete mineralization of 2-NS via the ozonation treatment can be achieved. The mineralization of 2-NS is found accelerated by the introduction of UV radiation and has a distinct relationship with the consumption of applied ozone. These results can provide useful information for the proper removal of 2-NS in the electroplating solution by the ozonation with UV radiation.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Chen
authors.forename: Ching-Yuan
authors.initials: CY
authors.lastname: Chang
authors.forename: Shih-Fong
authors.initials: SF
authors.lastname: Huang
authors.forename: Neng-Chou
authors.initials: NC
authors.lastname: Shang
authors.forename: Chun-Yu
authors.initials: CY
authors.lastname: Chiu
authors.forename: Yue-Hwa
authors.initials: YH
authors.lastname: Yu
authors.forename: Pen-Chi
authors.initials: PC
authors.lastname: Chiang
authors.forename: Je-Lueng
authors.initials: JL
authors.lastname: Shie
authors.forename: Chyow-San
authors.initials: CS
authors.lastname: Chiou
mesh_terms: D004595:Electroplating; D010083:Oxidants, Photochemical / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D010777:Photochemistry; D013451:Sulfonic Acids / Q000737:chemistry*; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
chemical_list: D010083:Oxidants, Photochemical; D013451:Sulfonic Acids; C035818:2-naphthylsulfamic acid; D010126:Ozone