Sun Yuwei, Lei Jiashuang, Wang Yizhu, Tang Qian, Kang Chunli
Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University Changchun 130012 Jilin China
College of Environmental Science and Engineering, Jilin Normal University Siping 136000 Jilin China.
RSC Adv. 2020 May 5;10(29):17293-17301. doi: 10.1039/d0ra01880e. eCollection 2020 Apr 29.
A magnetic composite based on TiO nanosheets, ZnFeO and reduced graphene oxide (RGO) was synthesized by a one-step hydrothermal synthesis method, which possessed the band structure of a Z-scheme photocatalytic system. The properties and structures of the samples were characterized by XRD, UV-Vis DRS, Raman spectroscopy, SEM, EDS, XPS and PL spectroscopy. Compared with TiO nanosheets and the TiO/RGO composite, the obtained ternary composite with 3 wt% RGO exhibited a significant enhancement in photocatalytic activities, attributed to the efficient charge separation induced by the fabricated Z-scheme system. About 99.7% of -nitrophenol (-NP) degraded within 60 min under simulated solar irradiation. Trapping experiments showed that superoxide anions (˙O ) and hydroxyl radicals (˙OH) were the main active species in the -NP photocatalytic degradation. Finally, a possible photocatalytic mechanism of Z-scheme ZnFeO/TiO/RGO was proposed based on the results of trapping experiments and the energy bands of TiO and ZnFeO.
采用一步水热合成法合成了一种基于TiO纳米片、ZnFeO和还原氧化石墨烯（RGO）的磁性复合材料，其具有Z型光催化体系的能带结构。通过XRD、紫外可见漫反射光谱（UV-Vis DRS）、拉曼光谱、扫描电子显微镜（SEM）、能谱分析（EDS）、X射线光电子能谱（XPS）和光致发光光谱（PL）对样品的性能和结构进行了表征。与TiO纳米片和TiO/RGO复合材料相比，含3 wt% RGO的三元复合材料表现出显著增强的光催化活性，这归因于所构建的Z型体系诱导的有效电荷分离。在模拟太阳光照下，约99.7%的对硝基苯酚（-NP）在60分钟内降解。捕获实验表明，超氧阴离子（˙O ）和羟基自由基（˙OH）是对硝基苯酚光催化降解中的主要活性物种。最后，基于捕获实验结果以及TiO和ZnFeO的能带，提出了Z型ZnFeO/TiO/RGO可能的光催化机理。
Zotero 插件
