Low-temperature synthesis of anatase TiO2 nanoparticles with tunable surface charges for enhancing photocatalytic activity.
Low-temperature synthesis of anatase TiO2 nanoparticles with tunable surface charges for enhancing photocatalytic activity.
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DOI：
10.1371/journal.pone.0114638
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Zeng T
中科院分区：
文献类型：
--
作者：
Li Y;Qin Z;Guo H;Yang H;Zhang G;Ji S;Zeng T
本研究在聚亚胺（PEI）和聚苯乙烯磺酸钠（PSS）的存在下，采用低温沉淀-聚合工艺（LTPPP）合成了带正电或负电的锐钛矿型TiO2纳米颗粒。x射线衍射（XRD）和高分辨率透射电镜（HRTEM）证实了锐钛矿的结晶相。用zeta电位对制备的TiO2、PEI-TiO2和PSS-TiO2纳米粒子的电荷进行了表征。结果表明，PEI-TiO2纳米粒子的zeta电位可在+39.47 mV ~ +95.46 mV范围内调节，PSS-TiO2纳米粒子的zeta电位可在- 56.63 mV ~ - 119.32 mV范围内调节。与TiO2相比，PSS-TiO2对染料分子具有显著的吸附和降解作用，而PEI修饰的TiO2纳米粒子的光催化活性较低。紫外-可见漫反射光谱（DRS）和光致发光光谱（PL）结果表明，PSS-TiO2纳米粒子的电子-空穴对复合速率低于TiO2和PEI-TiO2。
In this work, the positively or negatively charged anatase TiO2 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 TiO2, PEI-TiO2 and PSS-TiO2 nanoparticles were investigated by zeta potentials. The results showed that the zeta potentials of PEI-TiO2 nanoparticles can be tuned from +39.47 mV to +95.46 mV, and that of PSS-TiO2 nanoparticles can be adjusted from −56.63 mV to −119.32 mV. In comparison with TiO2, PSS-TiO2 exhibited dramatic adsorption and degradation of dye molecules, while the PEI modified TiO2 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-TiO2 nanoparticles showed a lower recombination rate of electron-hole pairs than TiO2 and PEI-TiO2.
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影响因子：
4.5
作者：
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通讯作者：
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影响因子：
2.4
作者：
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影响因子：
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作者：
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影响因子：
3.3
作者：
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通讯作者：
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DOI：
10.1016/s0927-7757(98)00763-8
发表时间：
1999-03-31
影响因子：
5.2
作者：
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通讯作者：
Nieves, FJD