title: Enhanced photocatalytic performance of N-nitrosodimethylamine on TiO2 nanotube based on the role of singlet oxygen.
abstract: N-nitrosodimethylamine (NDMA) photocatalytic degradation performance and mechanism were investigated on the TiO2 nanotube prepared from anatase TiO2 nanopowder in terms of the production of reactive oxygen species including hydroxyl radical, singlet oxygen and superoxide radical. Significantly higher NDMA degradation efficiency was obtained on anatase TiO2 nanotube rather than anatase TiO2 nanopowder. The tubular morphology may be responsible for almost 100% NDMA removal on TiO2 nanotube, presumably due to its confinement effect leading to NDMA molecules within the nanotube being attacked by reactive oxygen species such as hydroxyl radical and singlet oxygen, and initiating reaction inside the nanotube. In particular, the ability of the nanotubular structure of TiO2 nanotube to promote a singlet oxygen oxidation pathway contributes much to the enhanced NDMA degradation efficiency and favors the formation of dimethylamine and NO3(-). Such function originating from nanotube morphology could bring new insights for the photocatalytic degradation of organic pollutants.
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China. Electronic address: guoxyan@nankai.edu.cn.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Guo
authors.affiliation: Department of Civil & Environmental Engineering, George R. Brown School of Engineering, Rice University, 6100 Main Street, Houston, TX 77005, United States.
authors.forename: Qilin
authors.initials: Q
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China.
authors.forename: Man
authors.initials: M
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Mingce
authors.initials: M
authors.lastname: Long
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China.
authors.forename: Lulu
authors.initials: L
authors.lastname: Kong
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China. Electronic address: zhouqx@nankai.edu.cn.
authors.forename: Qixing
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: College of Material Science and Chemical Engineering, Tianjin University of Science & Technology, Thirteenth Street 29, TEDA, Tianjin 300457, China.
authors.forename: Huaiqi
authors.initials: H
authors.lastname: Shao
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China.
authors.forename: Wanli
authors.initials: W
authors.lastname: Hu
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Wei
mesh_terms: D002384:Catalysis; D004123:Dimethylamines / Q000737:chemistry; D004128:Dimethylnitrosamine / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry; D008027:Light; D043942:Nanotubes / Q000737:chemistry* / Q000528:radiation effects; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D026082:Singlet Oxygen / Q000737:chemistry*; D013481:Superoxides / Q000737:chemistry; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D004123:Dimethylamines; D009566:Nitrates; D013481:Superoxides; C009495:titanium dioxide; D026082:Singlet Oxygen; D017665:Hydroxyl Radical; C034516:dimethylamine; D014025:Titanium; D004128:Dimethylnitrosamine
keywords: N-nitrosodimethylamine; Photocatalysis; Reactive oxygen species; TiO(2) nanotube