Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
Chemosphere. 2022 Dec;308(Pt 2):136279. doi: 10.1016/j.chemosphere.2022.136279. Epub 2022 Sep 2.
Emerging S-scheme heterojunction photocatalysts endowed with efficient charge separation and strong redox capacity have stimulated wide interests in dealing with environmental issues nowadays. In this work, we firstly fabricated the oxygen vacancy modified ZrTiO nanocrystals, which was further combined with AgI to build the defective S-scheme AgI/ZrTiO heterojunctions for visible-light photocatalytic norfloxacin degradation. The synthesized ZrTiO nanocrystals and AgI/ZrTiO heterojunctions displayed remarkably boosted norfloxacin degradation performance under visible-light irradiation. The reaction rate constant of the optimized AgI/ZrTiO-5% heterojunction is as high as 0.01419 min, which is approximately 43.35 times that of AgI and 7.93 times that of ZrTiO nanocrystals, and far superior to those of commercial TiO and commercial ZrO. The high-performance photocatalytic norfloxacin degradation could be mainly attributed to the formation of S-scheme charge transfer pathways and oxygen vacancy defects. More significantly, AgI/ZrTiO could also realize the effective photo-decomposition of other emerging pollutants. Finally, the visible-light photocatalytic performance and photocatalysis mechanism were investigated.
具有高效电荷分离和强氧化还原能力的新兴 S 型异质结光催化剂激发了人们解决当今环境问题的广泛兴趣。在这项工作中，我们首先制备了氧空位修饰的 ZrTiO 纳米晶，然后将其与 AgI 结合，构建了具有缺陷的 S 型 AgI/ZrTiO 异质结，用于可见光下光催化诺氟沙星降解。所合成的 ZrTiO 纳米晶和 AgI/ZrTiO 异质结在可见光照射下表现出显著增强的诺氟沙星降解性能。优化后的 AgI/ZrTiO-5%异质结的反应速率常数高达 0.01419 min，约为 AgI 的 43.35 倍，ZrTiO 纳米晶的 7.93 倍，远优于商业 TiO 和商业 ZrO。高性能光催化诺氟沙星降解主要归因于 S 型电荷转移途径和氧空位缺陷的形成。更重要的是，AgI/ZrTiO 还可以实现其他新兴污染物的有效光解。最后，研究了可见光光催化性能和光催化机理。
