Controllable synthesis of Zn₂TiO₄@carbon core/shell nanofibers with high photocatalytic performance

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• 作者：Peng Zhang ; Changlu Shao ; Mingyi Zhang ; Zengcai Guo ; Jingbo Mu ; Zhenyi Zhang ; Xin Zhang ; Pingping Liang ; Yichun Liu
• 关键词：Electrospinning ; Zn2TiO4@carbon core/shell nanofiber ; Rhodamine B ; Recyclability
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 出版时间：30 August, 2012
• 年：2012
• 卷：229-230
• 期：Complete
• 页码：265-272
• 全文大小：1598 K

文摘

Zn₂TiO₄@carbon core/shell nanofibers (Zn₂TiO₄@C NFs) with different thickness of carbon layers (from 2 to 8 nm) were fabricated by combining the electrospinning technique and hydrothermal method. The results showed that a uniform carbon layer was formed around the electrospun Zn₂TiO₄ nanofiber (Zn₂TiO₄ NFs). By adjusting the hydrothermal fabrication parameters, the thickness of carbon layer varied linearly with the concentration of glucose. Furthermore, the core/shell structure formed between Zn₂TiO₄ and carbon enhanced the charge separation of pure Zn₂TiO₄ under ultraviolet excitation, as evidenced by photoluminescence spectra. The photocatalytic studies revealed that the Zn₂TiO₄@C NFs exhibited enhanced photocatalytic efficiency of photodegradation of Rhodamine B (RB) compared with the pure Zn₂TiO₄ NFs under ultraviolet excitation, which might be attributed to the high separation efficiency of photogenerated electrons and holes based on the synergistic effect between carbon and Zn₂TiO₄. Notably, the Zn₂TiO₄@C NFs could be recycled easily by sedimentation without a decrease of the photocatalytic activity.