Degradation of atrazine from the riparian zone with a PEC system based on an anode of N-S-TiO2 nanocrystal-modified TiO2 nanotubes and an activated carbon photocathode

摘要

In this study, we developed a photoelectrochemical (PEC) system based on an anode of N-S-TiO2 nanocrystal-modified TiO2 nanotubes and an activated carbon photocathode to degrade atrazine from the riparian zone. This material of N-S-TiO2/AC was characterized by SEM, XRD, XPS, EDX and fluorescence detection. The characterization results indicated that the systems of NS-TiO2-TiO2/AC and NS-TiO2 NCs/TNTAs-AC/PTFE allowed the highest yield of (OH)-O-center dot. According to the simulation results of the absorbance of N-S-TiO2 with MS, N-S-TiO2 has a maximum absorbance at 155 nm and 237 nm in the UV region; the average absorbance of N-S-TiO2 in the visible region was 10 000 higher than that of TiO2. At pH 5.9, N-S-TiO2 NCs/TiO2 NTs-AC/PTFE realized the highest atrazine removal rate, reaching a 93.89% atrazine removal rate within 150 min in water from the riparian buffer zone. The PEC system comprising the anode of N-S-TiO2 nanocrystal-modified TiO2 nanotubes and the activated carbon photocathode might be an efficient way to remove atrazine in the riparian buffer zone.