Orthogonal Study of Degradation of 4-Toluene Sulfonic Acid Photocatalyzed by TiO_2

Orthogonal method was adopted to investigate the degradation behavior of 4-toluene sulfonic acid(4-TSA) photocatalyzed by TiO2 under ultraviolet(UV) irradiation.The main factors affecting the photocatalytic oxidation-degradation reaction,including pH values,dosage of catalyst,irradiation intensity and reaction time were studied in details.Results show that there exist optimum pH value,dosage of catalyst,irradiation intensity and reaction time under a certain reaction condition.Depending on the effect on the photocatalytic oxidation-degradation reaction,various factors can be sequentially ranked as UV irradiation time irradiation intensity pH dosage of catalyst.Under the optimized conditions(irradiation time 120 min,irradiation intensity 500 W,pH = 3,and catalyst dosage 80 mg/L),4-TSA can be completely degraded.