C-doped mesoporous anatase TiO₂ comprising 10 nm crystallites

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• 作者：Chong Xie^a ; ¹ ; Shenghui Yang^a ; ¹ ; Beibei Li^a ; Hongkong Wang^a ; Jian-Wen Shi^a ; ^{shijnwn@163.com" class="auth_mail" title="E-mail the corresponding author} ; Guodong Li^b ; Chunming Niu^a ; ^{cniu@mail.xjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：TiO2 ; MWCNT ; Photocatalysis ; Carbon doping ; Mesoporous
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 August 2016
• 年：2016
• 卷：476
• 期：Complete
• 页码：1-8
• 全文大小：2162 K

文摘

We report a C-doped mesoporous anatase TiO₂ with high surface area synthesized using multi-walled carbon nanotube (MWCNT) mat as a “rigid” template and carbon doping source. The characterization by SEM, HRTEM, X-ray diffraction and nitrogen adsorption revealed that TiO₂ samples have a porous structure which are figuratively a inverse copy of MWCNT network and pore walls are formed by interconnected TiO₂ nanoparticles with average diameter of ∼10 nm. We found that annealing temperatures from 400 to 1000 °C before MWCNT template removal had very limited effect on particle size (∼10 nm), surface area (112–129 m²/g) and total pore volume (0.74–0.85 m²/g) of the samples through a significantly delayed phase transition from anatase to rutile started at 800 °C, resulting in only ∼9.1% conversion at 1000 °C. The pore size distribution is in mesopore range from 6 to 60 nm peaked at ∼24 nm. XPS analysis showed a relatively strong C1s peak at 288.4 eV, indicating C doping at Ti sites, which is responsible for red shift of adsorption edge of UV–vis spectra and photocatalytic activity in visible-light region.