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›› 2011, Vol. 11 ›› Issue (6): 1060-1067.

• 材料工程专栏 • Previous Articles     Next Articles

Solid-phase Synthesis of S and Cr Co-doped TiO2 Mesoporous Materials with Visible Light Degradation Property for Neutral Red

SHI Feng-xiang LIU Shao-you FENG Qing-ge   

  1. Institute of Applied Chemistry, Kaili Universit Institute of Applied Chemistry, Kaili University College of Chemistry and Chemical Engineering, Guangxi University
  • Received:2011-07-29 Revised:2011-10-20 Online:2011-12-20 Published:2011-12-20
  • Contact: SHI Feng-xiang

S与Cr共掺杂TiO2介孔材料的固相合成及其可见光降解中性红

石凤湘 刘少友 冯庆革   

  1. 凯里学院应用化学研究所 凯里学院应用化学研究所 广西大学环境学院
  • 通讯作者: 石凤湘

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Abstract: S and Cr co-doped TiO2 (S-Cr-TiO2), S-doped TiO2 (S-TiO2) and Cr-doped TiO2 (Cr-TiO2) mesoporous nanomaterials are synthesized by solid-state reaction. Their textural properties are characterized. And, the visible light degradation properties of neutral red (NR) on the materials are investigated. The results show that S atom as S6+ and Cr as Cr3+ and/or Cr6+ states are incorporated into the lattice of TiO2 or interstice of TiO2 lattice. The BET specific surface areas of 148.2, 134.6 and 122.8 m2/g, as well as the pore distribution centres of 2.4, 2.6 and 3.06 nm for S-TiO2, Cr-TiO2 and S-Cr-TiO2 (S/Cr=1:1, molar ratio) materials are obtained, respectively. Moreover, the areas of S-Cr-TiO2 mesomaterials decrease with increasing of S/Cr molar ratio. The bonds of Ti?O?S and Cr?O?S and the trace of Cr2O3 and CrO3 exist in the S-Cr-TiO2 mesoporous materials. S and Cr co-doped TiO2 can effectively embarrass the crystal growth of TiO2. The UV-Vis spectra display that the adsorption region of S-Cr-TiO2 materials covers the visible light region and extends to near infrared light region. Moreover, at 25℃, pH=6.5, the high catalytic activity for NR is found on the S-Cr-TiO2 (S/Cr=3:2) meso-material irradiated by the visible light. Within 60 min, the visible light degradation rate of NR on the S-Cr-TiO2 meso-material is 91.8%, which is 2.32, 1.74 and 2.11 times corresponding to pure TiO2 (39.6%), S-TiO2 (52.7%), Cr-TiO2 (43.4%), respectively. The atomic percentage and transformation between Cr3+ and Cr6+ in S-Cr-TiO2 meso-materials control the degradation rate of NR, and the Cr6+ ions act as a key role on S-Cr-TiO2 catalysts.

Key words: sulfur, chromium, titanium dioxide, solid-phase synthesis, mesoporous material, visible light degradation, neutral red

摘要： 采用固相反应法分别合成了铬掺杂二氧化钛(Cr-TiO2)、硫掺杂二氧化钛(S-TiO2)及硫和铬共掺杂二氧化钛(S-Cr-TiO2)介孔材料，对其进行了物相织构表征，并研究了其对中性红的可见光降解性能. 结果表明，在S-Cr-TiO2中，硫以阳离子S6+形式、铬以同晶取代方式进入TiO2晶格或晶格间隙；S-TiO2, Cr-TiO2及S-Cr-TiO2 (摩尔比S/Cr=1:1)的比表面积分别为148.2, 134.6, 122.8 m2/g，孔半径分布中心依次为2.4, 2.6和3.06 nm. S-Cr-TiO2则随S/Cr比增大比表面积逐渐降低，同时存在Ti?O?S和Cr?O?S键并出现微量Cr2O3与CrO3物相. S与Cr共掺杂能有效限制TiO2微晶的生长，其紫外-可见漫反射吸收光谱覆盖了可见光区并延伸到近红外区域. 在25℃及pH=6.5条件下，S-Cr-TiO2 (S/Cr=3:2)在60 min内对中性红的降解率达91.8%，分别是纯TiO2 (39.6%), S-TiO2 (52.7%)及Cr-TiO2 (43.4%)的2.32, 1.74和2.11倍. Cr3+与Cr6+的相对含量及价态的转化控制中性红的降解率，Cr6+对中性红的降解起决定性作用.

关键词: 硫, 铬, 二氧化钛, 固相合成, 介孔材料, 可见光降解, 中性红

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