Novel cake-like N-doped anatase/rutile mixed phase TiO₂ derived from metal-organic frameworks for visible light photocatalysis

详细信息    查看全文

• 作者：Jinliang Li^a ; ¹ ; Xingtao Xu^a ; ¹ ; Xinjuan Liu^b ; ^{lxj669635@126.com" class="auth_mail" title="E-mail the corresponding author} ; Wei Qin^c ; Likun Pan^a ; ^{lkpan@phy.ecnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Metal-organic frameworks ; Cake-like TiO2 ; Anatase/rutile mixed phase ; N doping ; Photocatalysis
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：835-840
• 全文大小：1088 K

文摘

Novel cake-like N-doped anatase/rutile mixed phase TiO₂ (A/R N-TiO₂) was successfully prepared through the pyrolysis of metal-organic frameworks MIL-125 and subsequent annealing in ammonia atmosphere. The morphology, structure and photocatalytic performance of A/R N-TiO₂ in the degradation of Rhodamine B (RhB) were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV–vis absorption spectroscopy and electrochemical impedance spectra, respectively. The results show that the A/R N-TiO₂ exhibits excellent photocatalytic performance. By optimizing the annealing temperature in ammonia atmosphere, a maximum RhB degradation rate of 93% under visible light irradiation is achieved. The improved photocatalytic performance is ascribed to the enhanced light absorption as well as the reduced electron-hole pair recombination after the N doping and the presence of stepwise energy levels in anatase and rutile TiO₂.