Highly efficient photocatalytic degradation of methylene blue by PoPD/TiO2 nanocomposite.
The poly-o-phenylenediamine (PoPD)/TiO2 nanocomposite was successfully synthesized via 'in situ' oxidative polymerization method. The modified photocatalysts were characterized by BET, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrarad spectra (FT-IR), thermogravimrtic analysis (TGA), X-ray photoelectron spectroscopy (XPS), Ultraviolet-visible diffuse reflectance spectrum (UV-Vis DRS) and Photocurrent Test. The results showed that the PoPD exists on the surface of TiO2, the presence of PoPD does not impact on the lattice structure and grain size of TiO2, and the presence of PoPD enhances the visible response and photoelectric property. The photocatalytic degradation of methylene blue (MB) was chosen as a model reaction to evaluate the photocatalytic activities of TiO2 and PoPD/TiO2. The optimal preparation condition was the molar ratio of oPD to TiO2 = 3:1, HCl concentration = 1.2 mol/L, the molar ratio of APS to oPD = 1:1. The apparent first-order rate constant kapp of PoPD/TiO2 nanocomposite was 0.0098 min-1, which is 6 times higher than TiO2 (0.0016 min-1). Meanwhile, the PoPD/TiO2 nanocomposites showed excellent photocatalytic stability, and the photocatalytic stability was depended on the stability of structure. At last, the photocatalytic mechanism of POPD/TiO2 nanocomposites was also proposed based on the synergetic effect between TiO2 and PoPD.
College of Geography and Environment, Shandong Normal University, Jinan, People's Republic of China.|College of Resources and Environmental Sciences, China Agricultural University, Beijing, People's Republic of China.
Chuanxi
C
Yang
NJTECH Environment Technology Co., Ltd, Nanjing, People's Republic of China.
Ming
M
Zhang
Shandong Academy of Environmental Science and Environmental Engineering Co., Ltd, Jinan, People's Republic of China.
Wenping
W
Dong
College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan, People's Republic of China.
Guanwei
G
Cui
College of Geography and Environment, Shandong Normal University, Jinan, People's Republic of China.|Institute of Environment and Ecology, Shandong Normal University, Jinan, People's Republic of China.
Zongming
Z
Ren
College of Geography and Environment, Shandong Normal University, Jinan, People's Republic of China.|Institute of Environment and Ecology, Shandong Normal University, Jinan, People's Republic of China.
Weiliang
http://orcid.org/0000-0002-6159-1292
W
Wang
D002384:Catalysis; D008027:Light; D008751:Methylene Blue / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053761:Nanocomposites / Q000737:chemistry*; D010655:Phenylenediamines / Q000737:chemistry*; D056951:Photoelectron Spectroscopy / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction / Q000379:methods
D010655:Phenylenediamines; C530487:poly(o-phenylenediamine); C009495:titanium dioxide; D014025:Titanium; D008751:Methylene Blue