Jiang Ling, Huang Yunpeng, Liu Tianxi
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, PR China.
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, PR China.
J Colloid Interface Sci. 2015 Feb 1;439:62-8. doi: 10.1016/j.jcis.2014.10.026. Epub 2014 Oct 24.
In this work, the effects of halloysite nanotubes (HNTs) on the visible-light photocatalytic ability of electrospun carbon doped TiO2/HNT (C-TH) nanofibers have been explored. Structural and morphological investigations demonstrate that incorporation of HNTs into anatase C-TH hybrid nanofibers was easily achieved by using sol-gel processing combined with electrospinning approach, thus HNTs could be uniformly embedded in the electrospun nanofibers. The visible-light photocatalytic efficiency of C-TH hybrid on the degradation of methyl blue (MB) was greatly enhanced with the combination of moderate amount of HNTs (8%), which was 23 times higher than that of commercial anatase TiO2. Mechanism of the enhancing effect of HNTs has been explored by analyzing the dual-effect of adsorption and photocatalysis in various amounts of HNTs incorporated C-TiO2 nanofibers. With nanotubular structure and considerable adsorption ability, incorporated HNTs functioned as porogen agent in C-TH nanofibers. This simple incorporation approach increases the specific surface areas of nanofibers, which improves the mass transport of reactant into the nanofibers and the adsorption of visible-light by scattering, meanwhile may suppress the charge recombination and enhance photoinduced charge separation, thus efficiently enhancing visible-light photocatalytic performance of the C-TH hybrid nanofibers.
在这项工作中，研究了埃洛石纳米管（HNTs）对电纺碳掺杂TiO2/HNT（C-TH）纳米纤维可见光光催化能力的影响。结构和形态研究表明，通过溶胶-凝胶工艺与静电纺丝方法相结合，可轻松将HNTs掺入锐钛矿型C-TH混合纳米纤维中，因此HNTs可均匀地嵌入电纺纳米纤维中。适量HNTs（8%）的加入极大地提高了C-TH混合物对亚甲基蓝（MB）的可见光光催化降解效率，比商用锐钛矿型TiO2高23倍。通过分析不同含量HNTs掺入的C-TiO2纳米纤维中吸附和光催化的双重作用，探讨了HNTs增强作用的机制。具有纳米管结构和可观吸附能力的HNTs在C-TH纳米纤维中起到了致孔剂的作用。这种简单的掺入方法增加了纳米纤维的比表面积，改善了反应物向纳米纤维内的传质以及通过散射对可见光的吸附，同时可能抑制电荷复合并增强光生电荷分离，从而有效提高了C-TH混合纳米纤维的可见光光催化性能。
