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首页> 外文期刊>Applied Surface Science >Enhancement of the photocatalytic activity of TiO_2 nanoparticles by surface-capping DBS groups
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Enhancement of the photocatalytic activity of TiO_2 nanoparticles by surface-capping DBS groups

机译：表面封端的DBS基团增强TiO_2纳米粒子的光催化活性

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摘要

TiO_2 nanoparticles capped with sodium dodecylbenzenesulfonate (DBS) are synthesized by a sol-hydrothermal process using tetrabutyl titanate and DBS as raw materials. The effects of surface-capping DBS on the surface photovoltage spectroscopy (SPS), photoluminescence (PL) and photocatalytic performance of TiO_2 nanoparticles are principally investigated together with their relationships. The results show that the surface of TiO_2 nanoparticles can be well capped by DBS groups while the pH value and added DBS amount are controlled at 5.0 and 2% of TiO_2 mass weight, respectively, and the linkage between DBS groups and TiO_2 surfaces is mainly by means of quasi-sulphonate bond. The intensities of SPS and PL spectra of TiO_2 obviously decrease after DBS-capping, while the activity can greatly increase during the photocatalytic degradation of Rhodamine B (RhB) solution, which are mainly attributed to the electron-withdrawing character of the DBS groups. Moreover, the enhancement of photocatalytic activity of DBS-capped TiO_2 is also related to the increase in the capability for adsorbing RhB.
机译：以钛酸四丁酯和DBS为原料，通过溶胶-水热法合成了十二烷基苯磺酸钠（DBS）包覆的TiO_2纳米粒子。主要研究了表面封端DBS对TiO_2纳米颗粒表面光电压谱（SPS），光致发光（PL）和光催化性能的影响及其关系。结果表明，DBS基团可以很好地覆盖TiO_2纳米粒子的表面，而pH值和DBS的添加量分别控制在TiO_2质量的5.0％和2％，DBS基团与TiO_2表面的键合主要是通过准磺酸键的手段。 DBS封端后，TiO_2的SPS和PL光谱强度明显降低，而在若丹明B（RhB）溶液的光催化降解过程中活性可以大大提高，这主要归因于DBS基团的吸电子特性。此外，DBS包覆的TiO_2的光催化活性的增强还与RhB吸附能力的提高有关。

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