亚硝酸盐
污染物
环境化学
清除
亚砷酸盐
激进的
化学
光化学
水溶液
无机化学
硝酸盐
砷
有机化学
抗氧化剂
作者
Shinbi Lee,Yoojin Lee,Wonyong Choi
标识
DOI:10.1016/j.apcatb.2023.122432
摘要
Nitrate (NO3−) and nitrite (NO2−) are ubiquitous aquatic pollutants and should be controlled for water quality. Although diverse methods of nitrate/nitrite reduction have been developed, most require chemical reductants and external energy inputs. Nitrite is oxidized by photogenerated hydroxyl radicals (•OH) in an aqueous suspension of Pd-loaded TiO2 (Pd/TiO2) with producing nitrate as a major product. The main photoconversion product of nitrite is changed from nitrate to N2 on Pd/TiO2 in the presence of aquatic pollutants (arsenite (As(III)) or 4-chlorophenol (4-CP)) which can suppress the photooxidation of NO2− by scavenging holes/•OH. The photogenerated H2 on Pd/TiO2 serves as a main reductant and was immediately consumed for reducing nitrite to N2. The presence of As(III) or 4-CP also enhanced the durability of Pd/TiO2 by efficiently scavenging hole/•OH that may oxidize Pd nanoparticles. The proposed process can be a viable treatment option for nitrite-contaminated water containing various aquatic pollutants.
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