负载纳米TiO_2膨胀石墨/活性炭复合材料的制备及其性能

Preparation of Supported Nano-TiO_2 Expanded Graphite/Activated Carbon Composite and Its Properties

以膨胀石墨(EG)/活性炭复合材料(EGC)为基体,以蔗糖为原料引入炭包覆纳米TiO2,制备了负载纳米TiO2膨胀石墨/活性炭复合材料(TiO2/EGC);采用SEM、TEM、XRD及低温液氮吸附法对TiO2/EGC的微观形貌、孔结构和相关性能进行了表征。结果表明:EGC基体中不仅有微米级大孔作为吸附通道,而且有纳米级微孔作为选择性富集、吸附有机物的主体;EGC的比表面积为1 579 m2.g-1,约为EG的40倍,经负载纳米TiO2后,比表面积下降不大,其吸附能力却有所提高;包覆炭膜的TiO2主要分布在基体的表面且分布相对均匀,没有明显的团聚现象且负载牢固;以苯酚为目标降解物,TiO2的存在大大提高了EGC对苯酚的处理能力。

Using expanded graphite（EG）/activated carbon composites（EGC） as substrate and sucrose as raw material through introducing carbon coated nano-TiO2,supported nano-TiO2 expanded graphite/activated carbon composites（TiO2/EGC） were prepared.The micro-morphology,pore structure and related properties of the TiO2/EGC were characterized by using SEM,TEM,XRD and BET.The results show that there were micron-sized large pores as absorption channel and nanometer cells as the body for the selected enrichment and organic compounds absorption in the EGC substrate.The specific surface area of the EGC was 1 579 m2·g-1 which was about 40 times higher than that of the EG.After the loading of nano-TiO2,the decrease of the specific surface area of the material was slight,while the absorption ability increased.The TiO2 coated carbon film mainly distributed on the substrate surface uniformly,no obvious agglomerates were observed and the loading was very firmly.TiO2 could improve the phenol treatment ability for the EGC when using the phenol as target decomposition material.