title: [Photodegradation performance and mechanisms of carbamazepine and its impact factors].
abstract: The photodegradation performance and mechanisms of carbamazepine (CBZ) in pure water were investigated in simulated irradiation using a 300 W Xenon lamp. Batch experiments were carried out to explore the influences of nitrate (NO3(-)), bicarbonateradical (HCO3(-)) and humic acid (HA) on CBZ's photodegradation. The results demonstrate that the photodegradation of CBZ in pure water follows a pseudo-first-order kinetics. When the irradiation intensity was 1200 mW x cm(-2) and the initial concentration of CBZ was 200 microg x L(-1), the CBZ's photodegradation rate constant and half-life were 0.028 7 min(-1) and 24.15 min, respectively. Sensitization degradation gave the priority to the photodegradation of CBZ, and the contribution of singlet oxygen (1O2) was 75.3% which was higher than hydroxyl radical (*OH) of 5.6%. Under the conditions of this study, the increase of NO3(-), HCO3(-) and HA concentration inhibited CBZ's photodegradation. Among of which, the inhibition effect of NO3(-) on CBZ's photodegradation was the most significant. When the concentration of NO3(-) was up to 0.5 mmol x L(-1), the half-life of CBZ was prolonged to 433.22 min, which was 18 times as that in pure water without NO3(-).
authors: Key Laboratories of Water Pollution Control Technology, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China. chaochen864259620@163.com
authors: Chao
authors: C
authors: Chen
authors: Qian
authors: Q
authors: Zhao
authors: Li
authors: L
authors: Feng
authors: Li-Qiu
authors: LQ
authors: Zhang
mesh_terms: D001639:Bicarbonates / Q000737:chemistry; D002220:Carbamazepine / Q000737:chemistry* / Q000302:isolation & purification*; D003198:Computer Simulation; D006812:Humic Substances; D008027:Light; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D010782:Photolysis / Q000528:radiation effects*; D062065:Wastewater / Q000032:analysis; D014978:Xenon
chemical_list: D001639:Bicarbonates; D002220:Carbamazepine; D006812:Humic Substances; D009566:Nitrates; D062065:Wastewater; D014978:Xenon