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Facile fabrication of graphene@Fe-Ti binary oxide nanocomposite from ilmenite ore: An effective photocatalyst for dye degradation under visible light irradiation
Journal of Water Process Engineering ( IF 6.3 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.jwpe.2020.101474
Ngoc Tuan Truong , Hoai Phuong Nguyen Thi , Ha Duc Ninh , Xuan Thinh Phung , Chinh Van Tran , Thanh Tung Nguyen , Tien Dung Pham , Trung Dung Dang , Soon Woong Chang , Eldon R. Rene , Huu Hao Ngo , Dinh Duc Nguyen , Duong Duc La

Photocatalysis is an effective treatment technique for the removal of toxic pollutants present in water and wastewater. In this study, graphene@Fe-Ti binary oxide composites was prepared using a hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and Brunauer-Emmett-Teller surface area analysis. The prepared composite exhibited even distribution of the Fe-Ti binary oxide on the surface of graphene, with an average diameter of 16.4 nm and a surface area of 133.7 m2/g. The optical property was evaluated and the band gap was calculated to be 2.867 eV using solid-state UV–vis spectroscopy and the [F(R)hν]1/2 plot. Lab-scale experiments were performed to evaluate the performance of graphene@Fe-Ti binary oxides to remove methyl blue (i.e. a dye) from wastewater. It was observed that the graphene loading had a significant effect on the photocatalytic activity of the composite and a composite with 20 % graphene showed the highest photocatalytic activity, with 100 % removal of the dye, after 20 min of irradiation time and a degradation rate constant of 0.213 min−1. Besides, the possible photocatalytic dye degradation mechanism using graphene@Fe-Ti binary oxide composite has also been proposed.



中文翻译:

利用钛铁矿轻松制备石墨烯@ Fe-Ti二元氧化物纳米复合材料:可见光照射下染料降解的有效光催化剂

光催化是去除水和废水中有毒污染物的有效处理技术。在这项研究中,使用水热法制备了石墨烯@ Fe-Ti二元氧化物复合材料,并通过扫描电子显微镜,透射电子显微镜,X射线衍射,傅立叶变换红外光谱和Brunauer-Emmett-Teller表面积分析对其进行了表征。制备的复合材料在石墨烯表面上显示出Fe-Ti二元氧化物的均匀分布,平均直径为16.4 nm,表面积为133.7 m 2 / g。使用固态紫外-可见光谱法和[F(R) ] 1/2,对光学性质进行了评估,并且带隙计算为2.867 eV情节。进行了实验室规模的实验,以评估石墨烯@ Fe-Ti二元氧化物从废水中去除甲基蓝(即染料)的性能。观察到石墨烯负载量对复合材料的光催化活性有显着影响,并且在20分钟的辐照时间后,具有20%石墨烯的复合材料显示出最高的光催化活性,其中100%去除了染料,降解速率常数为0.213min -1。此外,还提出了使用石墨烯@ Fe-Ti二元氧化物复合物的可能的光催化染料降解机理。

更新日期:2020-07-08
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