Boonprakob Natkritta, Channei Duangdao, Zhao Chen
Program of Chemistry, Faculty of Science and Technology, Uttaradit Rajabhat University, Uttaradit, 53000, Thailand.
Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand.
Discov Nano. 2024 Jan 31;19(1):22. doi: 10.1186/s11671-023-03919-0.
The enhancement of the photocatalytic performance of pristine WO was systematically adjusted due to its fast recombination rate and low reduction potential. A designed heterostructure photocatalyst was necessarily synthesised by Fe metal ions doping into WO structure with and composition modification. In this study, we synthesised a retrievable Fe-doped WO/SiO heterostructure using a surfactant-assisted hydrothermal method. This heterostructure was then employed as an effective photocatalyst for the removal of Cr(VI) under visible light irradiation. Enlarged photocatalytic reduction was observed over a synergetic 7.5 mol% Fe-doped WO/SiO-20 nanocomposite, resulting in dramatically increased activity compared with undoped WO and SiO nanomaterials under visible light illumination within 90 min. The presence of 7.5 mol% Fe ion dopant in WO optimised electron-hole recombination, consequently reducing WO photocorrosion. After adding SiO nanoparticles, the binary WO-SiO nanocomposite played roles as both adsorbent and photocatalyst to increase specific surface area. Thus, the 7.5 mol% Fe-doped WO/SiO-20 nanocomposite catalyst had more active sites on the surface of catalyst, and enhanced photocatalytic reduction was significantly achieved. The results showed 91.1% photocatalytic reduction over the optimum photocatalyst, with a photoreduction kinetic rate of 21.1 × 10 min, which was approximately four times faster than pristine WO. Therefore, the superior optimal photocatalyst demonstrated reusability, with activities decreasing by only 9.8% after five cycles. The high photocatalytic performance and excellent stability of our photocatalyst indicate great potential for water pollution treatments.
由于其快速的复合率和较低的还原电位，原始WO的光催化性能得到了系统的调整。通过将铁金属离子掺杂到WO结构中并进行组成改性，必然合成了一种设计的异质结构光催化剂。在本研究中，我们使用表面活性剂辅助水热法合成了一种可回收的铁掺杂WO/SiO异质结构。然后将这种异质结构用作在可见光照射下去除Cr(VI)的有效光催化剂。在协同的7.5 mol%铁掺杂WO/SiO-20纳米复合材料上观察到光催化还原增强，与未掺杂的WO和SiO纳米材料相比，在90分钟内可见光照射下活性显著增加。WO中7.5 mol%铁离子掺杂剂的存在优化了电子-空穴复合，从而减少了WO光腐蚀。添加SiO纳米颗粒后，二元WO-SiO纳米复合材料同时起到吸附剂和光催化剂的作用，以增加比表面积。因此，7.5 mol%铁掺杂WO/SiO-20纳米复合催化剂在催化剂表面具有更多的活性位点，并显著实现了增强的光催化还原。结果表明，最佳光催化剂的光催化还原率为91.1%，光还原动力学速率为21.1×10 min，比原始WO快约四倍。因此，优异的最佳光催化剂表现出可重复使用性，五个循环后活性仅下降9.8%。我们的光催化剂的高光催化性能和优异稳定性表明其在水污染处理方面具有巨大潜力。
