Open AccessInfluences of Sn/Cu single doping and CO-doping on the structure and photocatalytic property of anatase/rutile mixed crystal TiO2 nanomaterials under UV-visible light
Author(s) -
Q. Qin,
Qin Zhou,
Lili He,
Xiaodong Zhu,
Wei Feng,
J. Wang
Publication year - 2022
Publication title -
digest journal of nanomaterials and biostructures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.256
H-Index - 44
ISSN - 1842-3582
DOI - 10.15251/djnb.2022.171.65
Subject(s) - anatase , photocatalysis , rutile , doping , materials science , nanomaterials , absorption (acoustics) , photochemistry , nanotechnology , inorganic chemistry , chemical engineering , chemistry , optoelectronics , catalysis , organic chemistry , composite material , engineering
Anatase/rutile mixed crystal TiO2 nanomaterials were prepared by sol-gel method and modified by Sn/Cu single doping and co-doping. Sn doping promotes the transformation from anatase to rutile, while Cu doping inhibits the phase transformation. The inhibition effect of Cu doping on phase transition is stronger than that of Sn doping. Sn or Cu doping reduces the recombination rate, and co-doping produces a synergistic effect on the inhibition of recombination. The photocatalytic experiment results show that the photocatalytic activity of Sn-TiO2 is higher than that of pure TiO2 owing to higher quantum efficiency and light source absorption. The first order reaction rate constant increases from 0.00904 min-1 for pure TiO2 to 0.01476 min-1 for Sn-TiO2. Unexpected, the photocatalytic activities of Cu-TiO2 and Sn/Cu-TiO2 are lower than that of pure TiO2. Although Cu doping improves the quantum efficiency, it reduces the absorption of ultraviolet region significantly, which is the key reason for the decline of their photocatalytic performance.