Irfan Syed, Liang Guang-Xing, Li Fu, Chen Yue-Xing, Rizwan Syed, Jin Jingcheng, Zhuanghao Zheng, Ping Fan
Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Nanomaterials (Basel). 2019 Sep 19;9(9):1337. doi: 10.3390/nano9091337.
Photocatalysts are widely used for the elimination of organic contaminants from waste-water and H evaluation by water-splitting. Herein, the nanohybrids of lanthanum (La) and selenium (Se) co-doped bismuth ferrites with graphene oxide were synthesized. A structural analysis from X-ray diffraction confirmed the transition of phases from rhombohedral to the distorted orthorhombic. Scanning electron microscopy (SEM) revealed that the graphene nano-sheets homogenously covered La-Se co-doped bismuth ferrites nanoparticles, particularly the (BiLaFeSeO-graphene oxide) LBFSe50-G sample. Moreover, the band-gap nanohybrids of La-Se co-doped bismuth ferrites were estimated from diffuse reflectance spectra (DRS), which showed a variation from 1.84 to 2.09 eV, because the lowering of the band-gap can enhance photocatalytic degradation efficiency. Additionally, the photo-degradation efficiencies increased after the incorporation of graphene nano-sheets onto the La-Se co-doped bismuth ferrite. The maximum degradation efficiency of the LBFSe50-G sample was up to 80%, which may have been due to reduced band-gap and availability of enhanced surface area for incoming photons at the surface of the photocatalyst. Furthermore, photoluminescence spectra confirmed that the graphene oxide provided more electron-capturing sites, which decreased the recombination time of the photo-generated charge carriers. Thus, we can propose that the use of nanohybrids of La-Se co-doped bismuth ferrite with graphene oxide nano-sheets is a promising approach for both water-treatment and water-splitting, with better efficiencies of BiFeO.
光催化剂被广泛用于去除废水中的有机污染物以及通过水分解进行氢气评估。在此，合成了镧（La）和硒（Se）共掺杂的铋铁氧体与氧化石墨烯的纳米杂化物。X射线衍射的结构分析证实了相从菱面体向扭曲正交晶系的转变。扫描电子显微镜（SEM）显示氧化石墨烯纳米片均匀地覆盖了La - Se共掺杂的铋铁氧体纳米颗粒，特别是（BiLaFeSeO - 氧化石墨烯）LBFSe50 - G样品。此外，通过漫反射光谱（DRS）估计了La - Se共掺杂铋铁氧体的带隙纳米杂化物，其显示出从1.84到2.09 eV的变化，因为带隙的降低可以提高光催化降解效率。另外，在将氧化石墨烯纳米片掺入La - Se共掺杂的铋铁氧体后，光降解效率提高。LBFSe50 - G样品的最大降解效率高达80%，这可能是由于带隙减小以及光催化剂表面用于入射光子的表面积增加。此外，光致发光光谱证实氧化石墨烯提供了更多的电子捕获位点，这减少了光生电荷载流子的复合时间。因此，我们可以提出，使用La - Se共掺杂的铋铁氧体与氧化石墨烯纳米片的纳米杂化物是一种用于水处理和水分解的有前景的方法，具有更好的BiFeO效率。
