铁酸铋负载石墨烯复合材料的制备及应用

Preparation and Application of Bismuth Ferrate Supported Graphene Composites

为了降解工业废水,制备了铁酸铋负载石墨烯复合材料,并将其应用于工业废水降解中。制备氧化石墨烯和铁酸铋,在水热反应釜中,通过水热法制备铁酸铋负载石墨烯复合材料。利用X射线衍射分析和透射电子显微镜分析对复合材料进行表征。发现铁酸铋负载石墨烯复合材料衍射峰强度和铁酸铋相比向低位移动,说明复合材料被还原;铁酸铋纳米颗粒较均匀地分布于石墨烯表面上,说明铁酸铋负载石墨烯复合材料可有效结合铁酸铋与石墨烯。将制备材料应用于工业废水降解中,结果表明:降解5个月后,复合材料表层出现孔穴;降解10个月后,复合材料孔穴增加,有粗大的纤维裸露;经铁酸铋负载石墨烯复合材料降解后,废水p H、COD值以及色度均明显降低;工业废水在400 nm处出现吸收峰,在光催化时间逐渐增加的情况下,吸收峰逐渐降低,反应150 min后,吸收峰基本消失,水样色度也显著降低;制备复合材料降解率和反应速率常数最高;铁酸铋负载石墨烯复合材料在经多次使用后仍可保持很高的降解率。可见制备复合材料有助于工业废水降解,有更高的光催化性能,稳定性很高,可承受长时间多次循环使用,可将其应用在工业废水降解环境中。

In order to degrade industrial wastewater,bismuth ferrite supported graphene composites were prepared and applied to the degradation of industrial wastewater. Graphene oxide and bismuth ferrite were prepared.Bismuth ferrite supported graphene composites were prepared by hydrothermal method in a hydrothermal reactor.The composites were characterized by X-ray diffraction and transmission electron microscopy. It was found that the diffraction peak strength of bismuth ferrite supported graphene composites shifted to a lower displacement than that of bismuth ferrite,indicating that the composites were reduced. Bismuth ferrite nanoparticles were more uniformly distributed on the surface of graphene,indicating that bismuth ferrite supported graphene composites could effectively combine bismuth ferrite with graphene. The prepared materials were applied to the degradation of industrial wastewater. The results showed that after 5 months of degradation,there were holes on the surface of composite materials. After 10 months of degradation,the holes of composite materials increased and the coarse fibers were exposed. After the degradation of graphene composite materials loaded with bismuth ferrite,the pH,COD value and chroma of wastewater decreased significantly. The absorption peak of industrial wastewater appeared at 400 nm,and when photocatalysis was carried out. The absorption peak decreases gradually with the increase of reaction time. After 150 minutes,the absorption peak disappears and the chroma of water sample decreases significantly.The degradation rate and reaction rate constant of the prepared composites are the highest. Bismuth ferrite supported graphene composites can still maintain a high degradation rate after repeated use. It can be seen that the preparation of composite materials is conducive to the degradation of industrial wastewater,has higher photocatalytic performance,high stability,can withstand long-term multiple recycling,and can be used in industrial wastewater degradation environment.