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采用水热法制备纳米TiO_2/石墨烯复合材料,并研究了纳米TiO_2/石墨烯复合材料光催化性能的影响因素。通过XRD、UV-Vis、SEM和EDS等手段对样品进行了表征与分析,以亚甲基蓝(MB)为目标降解物,评价了纳米TiO_2/石墨烯复合材料的光催化效果。研究表明复合材料结晶良好,带隙小,在可见光下具有较好的光催化性能。水热时间、水热温度和氧化石墨烯含量对复合材料的光催化性能均产生影响。样品的光催化活性随着水热时间和氧化石墨烯含量的增加而增高;随水热温度的升高先增高后降低然后又增高。在水热时间为10 h,水热温度120℃,石墨烯含量为5%的条件下制备出的纳米TiO2/石墨烯复合材料光催化性能最好,复合材料粉末在5 h内对亚甲基蓝的降解率高达86.99%。
The nano-TiO 2 / graphene composite was prepared by hydrothermal method and the influencing factors on the photocatalytic activity of the nano TiO 2 / graphene composite were studied. The samples were characterized and analyzed by XRD, UV-Vis, SEM and EDS. The photocatalytic activity of nano-TiO 2 / graphene composites was evaluated using methylene blue (MB) as the target degradation product. The results show that the composite has good crystal structure, small band gap and good photocatalytic activity under visible light. Hydrothermal time, hydrothermal temperature and graphene oxide content all affect the photocatalytic activity of the composites. The photocatalytic activity of the samples increased with the increase of hydrothermal time and graphene oxide content. With the increase of hydrothermal temperature, the photocatalytic activity first increased, then decreased and then increased. The photocatalytic activity of nano-TiO2 / graphene composite prepared under hydrothermal time of 10 h, hydrothermal temperature of 120 ℃ and graphene content of 5% was the best. The degradation of methylene blue in 5 h Rate up to 86.99%.