School of Fundamental Sciences, China Medical University, Shenyang 110122, China.
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Molecules. 2017 Nov 10;22(11):1943. doi: 10.3390/molecules22111943.
Highly crystalline mesoporous anatase TiO₂ nanospheres with high surface area (higher than P25 and anatase TiO₂) are prepared by a soft-template method. Despite the high specific surface area, these samples have three times lower equilibrium adsorption (<2%) than Degussa P25. The rate constant of the mesoporous anatase TiO₂ (0.024 min) reported here is 364% higher than that of P25 (0.0066 min), for the same catalytic loading. The results of oxidation-extraction photometry using several reactive oxygen species (ROS) scavengers indicated that mesoporous anatase TiO₂ generates more ROS than P25 under UV-light irradiation. This significant improvement in the photocatalytic performance of mesoporous spherical TiO₂ arises from the following synergistic effects in the reported sample: (i) high surface area; (ii) improved crystallinity; (iii) narrow pore wall thicknesses (ensuring the rapid migration of photogenerated carriers to the surface of the material); and (iv) greater ROS generation under UV-light.
高度结晶的介孔锐钛矿 TiO₂ 纳米球具有高表面积（高于 P25 和锐钛矿 TiO₂），通过软模板法制备。尽管比表面积高，但这些样品的平衡吸附率（<2%）比 Degussa P25 低三倍。对于相同的催化负载量，本文报道的介孔锐钛矿 TiO₂（0.024 min）的速率常数比 P25（0.0066 min）高 364%。使用几种活性氧物种（ROS）清除剂的氧化萃取光度法的结果表明，在紫外光照射下，介孔锐钛矿 TiO₂比 P25 产生更多的 ROS。在报道的样品中，介孔球形 TiO₂ 的光催化性能得到了显著提高，这是由于以下协同效应所致：（i）高比表面积；（ii）提高结晶度；（iii）孔壁厚度较窄（确保光生载流子快速迁移到材料表面）；和（iv）在紫外光下产生更多的 ROS。
