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Synthesis and Modification of Zn‐doped TiO 2 Nanoparticles for the Photocatalytic Degradation of Tetracycline
Author(s) -
Pang Shuo,
Huang Jiguo,
Su Yun,
Geng Bo,
Lei Suyuan,
Huang Yuting,
Lyu Cong,
Liu Xingjuan
Publication year - 2016
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12626
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , anatase , visible spectrum , doping , materials science , nanoparticle , photochemistry , band gap , rutile , diffuse reflectance infrared fourier transform , nuclear chemistry , catalysis , chemistry , nanotechnology , chemical engineering , organic chemistry , optoelectronics , engineering
Abstract The synthesis of Zn‐doped TiO 2 nanoparticles by solgel method was investigated in this study, as well as its modification by H 2 O 2 . The catalyst was characterized by transmission electron microscopy, X‐ray diffraction, Brunauer–Emmett–Teller, UV –visible reflectance spectra and X‐ray photoelectron spectroscopy ( XPS ). The results indicated that doping Zn into TiO 2 nanoparticles could inhibit the transformation from anatase phase to rutile phase. Zn existed as the second valence oxidation state in the Zn‐doped TiO 2 . Zn‐doped TiO 2 that was synthesized by 5% Zn doping at 450°C exhibited the best photocatalytic activity. Then, the H 2 O 2 modification further enhanced the photocatalytic activity. Zn doping and H 2 O 2 modifying narrowed the band gap and efficiently increased the optical absorption in visible region. The optimal degradation rate of tetracycline by Zn‐doped TiO 2 and H 2 O 2 modified Zn‐doped TiO 2 was 85.27% and 88.14%. Peroxide groups were detected in XPS analysis of H 2 O 2 modified Zn‐doped TiO 2 , favoring the adsorption of visible light. Furthermore, Zn‐doped TiO 2 modified by H 2 O 2 had relatively good reusability, exhibiting a potential practical application for tetracycline's photocatalytic degradation.