摘要
采用冷冻浇注法制备TiO_2/壳聚糖多孔复合材料,研究二氧化钛含量对该复合材料的微观结构、抗压强度及光催化性能的影响。结果表明:TiO_2/壳聚糖多孔复合材料具有明显的长程有序结构,片层状排列的平行度良好。随TiO_2含量(质量分数,下同)从66.7%增加到88.8%,片层中的孔间距从50~45μm逐渐减小到5~10μm,片层厚度从2~3μm增加到20~25μm,多孔片层的致密度增大,复合材料的抗压强度也从0.05 MPa提高到0.12 MPa。当壳聚糖含量为13.3%、二氧化钛含量为85.7%、还原石墨烯含量为1%时,通过添加还原石墨烯对二氧化钛进行改性,所得的TiO_2/壳聚糖多孔复合材料在300 min时对甲基橙的光降解率由92.4%提高到97.0%。
Titanium dioxide/chitosan porous composites were prepared by freeze casting.The influence of TiO2 content on the microstructure, compressive strength and photocatalytic properties of the composites was investigated and characterized. The experimental results showed that TiO2/chitosan porous composites have a long-range ordered structure with well-parallel lamellar arrangement. With the increase of TiO2 content from 66.7% to 88.8%, the interlayer spacing decreases from 50-45 μm to 5-10μm, and the thickness of lamellae increases from 2-3 μm to 20-25 μm, respectively, while the compressive strength of the composites increases from 0.05 MPa to 0.12 MPa.When the content of chitosan is 13.3%, the content of titanium dioxide is 85.7% and the content of reduced graphene is 1%, the photo degradation rate of the titaniaJchitosan porous composites modified by reduced graphene increases from 92.4% to 97.0% in 300 min.
出处
《粉末冶金材料科学与工程》
北大核心
2017年第2期257-262,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(20110162130003)
