掺杂TiO₂-PS漂浮复合材料对柴油可见光驱动光催化降解的研究
Insight into visible light-driven photocatalytic degradation of diesel oil by doped TiO2-PS floating composites.
作者信息
Wang Xin, Wang Wei, Wang Xuejiang, Zhao Jianfu, Zhang Jing, Song Jingke
机构信息
College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
出版信息
Environ Sci Pollut Res Int. 2016 Sep;23(18):18145-53. doi: 10.1007/s11356-016-6884-x. Epub 2016 Jun 4.
TiO2-pearlstone (PS) floatable photocatalysts were synthesized using a facile sol-gel method and confirmed by XRD, N2 adsorption-desorption, SEM, EDX, TEM, FT-IR, XPS, and UV-vis DRS measurements. It has been found that the photocatalysts composed of anatase TiO2 deposited on the surface of PS and formed mesoporous structure. By N or B/N doping, the band gap of the photocatalyst has been narrowed. The obtained floatable photocatalysts can be applied to solar light-driven remediation of oil-contaminated water. Diesel oil was chosen as the model pollutant to evaluate the photocatalytic activity. The results showed B/N-TiO2-PS exhibited the highest photocatalytic activity for diesel oil under visible light irradiation, which is 48 % removal rate for 9 h. The reaction rate constant k of B/N-TiO2-PS is 0.08423 h(-1), which is four times larger than that of pure TiO2-PS. Moreover, the characteristic of floatable makes the photocatalysts easier to separate and reuse, which showed great potential for practical applications in the field of environmental cleanup and solar energy conversion.
采用简便的溶胶 - 凝胶法合成了TiO₂ - 珍珠岩（PS）可漂浮光催化剂，并通过XRD、N₂吸附 - 脱附、SEM、EDX、TEM、FT - IR、XPS和UV - vis DRS测量进行了表征。研究发现，光催化剂由沉积在PS表面的锐钛矿型TiO₂组成，并形成了介孔结构。通过N或B/N掺杂，光催化剂的带隙变窄。所制备的可漂浮光催化剂可用于太阳光驱动的含油污水修复。选择柴油作为模型污染物来评估光催化活性。结果表明，B/N - TiO₂ - PS在可见光照射下对柴油表现出最高的光催化活性，9小时的去除率为48%。B/N - TiO₂ - PS的反应速率常数k为0.08423 h⁻¹，是纯TiO₂ - PS的四倍。此外，可漂浮的特性使光催化剂更易于分离和重复使用，在环境净化和太阳能转换领域具有巨大的实际应用潜力。
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