Singh Rajinder, Ladol Jigmet, Khajuria Heena, Sheikh Haq Nawaz
Acta Chim Slov. 2017;64(1):170-178. doi: 10.17344/acsi.2016.2995.
A facile approach has been devised for the preparation of magnetic NiFe2O4 photocatalyst (NiFe2O4-NG) supported on nitrogen doped graphene (NG). The NiFe2O4-NG composite was synthesized by one step hydrothermal method. The nanocomposite catalyst was characterized by Powder X-ray diffraction (PXRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Ultraviolet-visible spectroscopy (UV-Vis) and Vibrating sample magnetometry (VSM). It is found that the combination of NiFe2O4 nanoparticles with nitrogen-doped graphene sheets converts NiFe2O4 into a good catalyst for methylene blue (MB) dye degradation by irradiation of visible light. The catalytic activity under visible light irradiation is assigned to extensive movement of photogenerated electron from NiFe2O4 to the conduction band of the reduced NG, effectively blocking direct recombination of electrons and holes. The NiFe2O4 nanoparticles alone have efficient magnetic property, so can be used for magnetic separation in the solution without additional magnetic support.
已经设计出一种简便的方法来制备负载在氮掺杂石墨烯（NG）上的磁性NiFe2O4光催化剂（NiFe2O4-NG）。通过一步水热法合成了NiFe2O4-NG复合材料。采用粉末X射线衍射（PXRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、紫外可见光谱（UV-Vis）和振动样品磁强计（VSM）对该纳米复合催化剂进行了表征。结果发现，NiFe2O4纳米颗粒与氮掺杂石墨烯片的结合使NiFe2O4成为一种在可见光照射下可用于降解亚甲基蓝（MB）染料的良好催化剂。可见光照射下的催化活性归因于光生电子从NiFe2O4大量转移到还原态NG的导带，有效地阻止了电子和空穴的直接复合。单独的NiFe2O4纳米颗粒具有高效的磁性，因此无需额外的磁性载体即可用于溶液中的磁分离。
