Lin Jianjian, Li Ping, Xu Huizhong, Kim Yena, Jing Zhongxin, Zheng Dehua
Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China; State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, PR China.
J Hazard Mater. 2020 Jun 5;391:122530. doi: 10.1016/j.jhazmat.2020.122530. Epub 2020 Mar 12.
Mesoporous single-crystals have emerged as a unique family of functional materials, exhibiting excellent performance in various applications, owing to their well-defined accessible mesoporosity and highly single-crystalline structures. Precise tailoring structures of mesoporous single-crystals at the nanoscale remains an unsolved scientific and technical challenge. Herein, we report a facile and general approach for the synthesis of mesoporous single-crystalline TiO nanoparticles (designated as MSC-TNs) with distinctive traits including tunable morphologies, controllable particle sizes, well dispersity, high hydrophilicity, well-defined mesoporosity and single-crystal nature. Specifically, the amount of water employed in the precursor solution was seen to give fine control over the particle sizes and morphologies of MSC-TNs. MSC-TNs with different sizes show excellent photocatalytic activity in production of hydrogen from water. Under the illumination of 300 W Xe lamp, MSC-TNs were shown to provide good photodegradation performance with Rhodamine 6 G, as well as H production when loaded 1 wt % Pt. In a CHOH solution H was evolved with a rate of 8.98 mmol h g, which is significantly higher than with commercial P25 nanoparticles (4.02 mmol h g).
介孔单晶已成为一类独特的功能材料，由于其具有明确的可及介孔率和高度单晶结构，在各种应用中表现出优异的性能。在纳米尺度上精确剪裁介孔单晶的结构仍然是一个尚未解决的科学技术难题。在此，我们报道了一种简便通用的方法来合成具有独特特性的介孔单晶TiO纳米颗粒（称为MSC-TNs），这些特性包括可调节的形态、可控的粒径、良好的分散性、高亲水性、明确的介孔率和单晶性质。具体而言，前驱体溶液中使用的水量被发现可以精细控制MSC-TNs的粒径和形态。不同尺寸的MSC-TNs在水制氢过程中表现出优异的光催化活性。在300 W氙灯照射下，MSC-TNs对罗丹明6G显示出良好的光降解性能，负载1 wt% Pt时也有产氢性能。在CHOH溶液中，产氢速率为8.98 mmol h g，明显高于商用P25纳米颗粒（4.02 mmol h g）。
