Low-Temperature Synthesis of Anatase TiO[subscript 2] Nanoparticles with Tunable Surface Charges for Enhancing Photocatalytic Activity
Author(s)Li, Ye; Qin, Zhenping; Guo, Hongxia; Yang, Hanxiao; Zhang, Guojun; Ji, Shulan; Zeng, Tingying; ... Show more Show less
Low-Temperature Synthesis of Anatase TiO2 Nanoparticles with Tunable Surface Charges for Enhancing Photocatalytic Activity
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In this work, the positively or negatively charged anatase TiO[subscript 2] nanoparticles were synthesized via a low temperature precipitation-peptization process (LTPPP) in the presence of poly(ethyleneimine) (PEI) and poly(sodium4- styrenesulfonate) (PSS). X-ray diffraction (XRD) pattern and high-resolution transmission electron microscope (HRTEM) confirmed the anatase crystalline phase. The charges of the prepared TiO[subscript 2], PEI-TiO[subscript 2] and PSS-TiO[subscript 2] nanoparticles were investigated by zeta potentials. The results showed that the zeta potentials of PEI-TiO[subscript 2] nanoparticles can be tuned from +39.47 mV to +95.46 mV, and that of PSS-TiO[subscript 2] nanoparticles can be adjusted from −56.63 mV to −119.32 mV. In comparison with TiO[subscript 2], PSS-TiO[subscript 2] exhibited dramatic adsorption and degradation of dye molecules, while the PEI modified TiO[subscript 2] nanoparticles showed lower photocatalytic activity. The photocatalytic performances of these charged nanoparticles were elucidated by the results of UV-vis diffuse reflectance spectra (DRS) and the photoluminescence (PL) spectra, which indicated that the PSS-TiO[subscript 2] nanoparticles showed a lower recombination rate of electron-hole pairs than TiO[subscript 2] and PEI-TiO[subscript 2].
DepartmentMassachusetts Institute of Technology. Research Laboratory of Electronics
Public Library of Science
Li, Ye, Zhenping Qin, Hongxia Guo, Hanxiao Yang, Guojun Zhang, Shulan Ji, and Tingying Zeng. “Low-Temperature Synthesis of Anatase TiO[subscript 2] Nanoparticles with Tunable Surface Charges for Enhancing Photocatalytic Activity.” Edited by Vipul Bansal. PLoS ONE 9, no. 12 (December 15, 2014): e114638.
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