Effect of metal-ion doping on the characteristics and photocatalytic activity of TiO2 nanotubes for the removal of toluene from water.
Toluene is an extensively used reagent that could cause water pollution and endanger human health. In this work, an O3/UV/ion-doped TiO2 nanotubes process was investigated to obtain the optimum TiO2 nanotubes for effective toluene decomposition. Photocatalytic activity is found to be influenced by the doped-ion type by affecting the ionic radius, valence state, and configuration of the dopant. The calcination temperature and doping concentration, which change the weight fractions of the anatase phase (fA), the Brunauer-Emmett-Teller surface area (SBET), and the energy band gap (Eg) of the catalyst, also affect the photocatalytic activity. When TiO2 is doped with ions, SBET decreases and Eg becomes narrower. The photocatalytic activities of TiO2 for toluene removal increase after doping with Ag(+), Al(3+), Cu(2+), Fe(3+), Mn(2+), Ni(2+), V(5+), and Zn(2+). Moreover, the 1.0% Fe(3+)-doped TiO2 nanotubes calcined at 550 °C have the highest catalytic activity, with a toluene removal efficiency of 70.7%.
Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, China and Key Laboratory of Educational Ministry for High Efficiency Mining and Safety in Metal Mines, University of Science and Technology Beijing, Beijing 100083, China E-mail: zhoubeihai@sina.com.
Rongfang
R
Yuan
Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, China and Key Laboratory of Educational Ministry for High Efficiency Mining and Safety in Metal Mines, University of Science and Technology Beijing, Beijing 100083, China E-mail: zhoubeihai@sina.com.
Beihai
B
Zhou
Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, China and Key Laboratory of Educational Ministry for High Efficiency Mining and Safety in Metal Mines, University of Science and Technology Beijing, Beijing 100083, China E-mail: zhoubeihai@sina.com.
Duo
D
Hua
Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, China and Key Laboratory of Educational Ministry for High Efficiency Mining and Safety in Metal Mines, University of Science and Technology Beijing, Beijing 100083, China E-mail: zhoubeihai@sina.com.
Chunhong
C
Shi
PetroChina Huabei Petrochemical Company, Renqiu, Hebei 062552, China.
Li
L
Ma
D002384:Catalysis; D008670:Metals; D043942:Nanotubes / Q000737:chemistry*; D055668:Photochemical Processes; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification; D014961:X-Ray Diffraction
D008670:Metals; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014050:Toluene; D014025:Titanium