Enhanced photocatalytic properties of N-P co-doped TiO2 nanosheets with {001} facets

• Published in: Rare metals Vol. 35; no. 12; pp. 940 - 947
• Main Authors: Wang, Fang, Ban, Pei-Pei, Parry, James P., Xu, Xiao-Hong, Zeng, Hao
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.12.2016; Springer Nature B.V
• Subjects: Absorption; Anatase; Atomic properties; Biomaterials; Chemistry and Materials Science; Doping; Energy; High temperature; Light; Low temperature; Materials Engineering; Materials Science; Metallic Materials; Morphology; Nanoscale Science and Technology; Nanosheets; Nitrogen; Optical properties; Photocatalysis; Photodegradation; Physical Chemistry; P掺杂; Solar energy; TiO2纳米; Titanium dioxide; 光催化性能; 光生电子; 共掺杂; 染料分子; 诱发反应; 锐钛矿型; Photocatalytic; TiO; {001} facets; Co-doping; nanosheets
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-016-0807-3

Nitrogen （N） and phosphorus （P） co-doped anatase TiO2 nanosheets were realized by low-temperature self-doping N-TiO2 followed by high-temperature P doping with foreign precursor. It is found that P doping process can maintain good TiO2 nanosheets morphology with exposed {001} facets. Chemical state of dopants indicates that N and P atoms replace O on O sites in TiO2 lattice. Compared with pure TiO2 and N-doped TiO2, N-P codoped TiO2 nanosheets exhibits stronger optical absorption and higher degradation rate of dye molecules in visible light regime. The enhanced photocatalytic properties are attributed to two factors. On one hand, N-P co-doping can effectively reduce band gap of TiO2 from 3.20 to 2.48 eV, leading to an enhancement of the absorption in visible light regime. On the other hand, the presence of exposed {001} facets of TiO2 nanosheets can induce the effective sepa- ration of photogenerated electrons and holes in reaction.