Decomposition of 2-naphthalenesulfonate in aqueous solution by ozonation with UV radiation.
This study investigates the ozonation of 2-naphthalenesulfonate (2-NS) combined with ultraviolet (UV) radiation. Naphthalenesulfonic acids are of importance as dye intermediates for the dye and textile auxiliary industries. Its derivatives, such as 2-NS, have been found in rivers and tannery effluents causing pollution problems. Thus, the 2-NS is of concern for the aquatic pollution control especially in the surface and waste waters. Ozonation combined with UV radiation is employed for the removal of 2-NS in the aqueous solution. Semibatch ozonation experiments were proceeded under different reaction conditions to study the effects of ozone dosage and UV radiation on the oxidation of 2-NS. The concentrations of 2-NS and sulfate are analyzed at specified time intervals to elucidate the decomposition of 2-NS. In addition, values of pH and oxidation reduction potential are continuously measured in the course of experiments. Total organic carbon is chosen as a mineralization index of the ozonation of 2-NS. The mineralization of 2-NS via the ozonation is remarkably enhanced by the UV radiation. These results can provide useful information for the proper removal of 2-NS in the aqueous solution by the ozonation with UV radiation.
Chen
Y H
YH
Graduate Institute of Environmental Engineering, National Taiwan University, Taipei.
Chang
C Y
CY
Huang
S F
SF
Chiu
C Y
CY
Ji
D
D
Shang
N C
NC
Yu
Y H
YH
Chiang
P C
PC
Ku
Y
Y
Chen
J N
JN
D001190:Arylsulfonates / Q000737:chemistry* / Q000528:radiation effects*; D002244:Carbon / Q000032:analysis; D004396:Coloring Agents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013997:Time Factors; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*
D001190:Arylsulfonates; D004396:Coloring Agents; D007220:Industrial Waste; D012996:Solutions; D013431:Sulfates; D014867:Water; D010126:Ozone; D002244:Carbon