有机物/TiO2电荷转移复合物的形成及其在可见光下的催化活性

张鑫, 宋琳, 李明玉, 曾小龙, 于奇志

张鑫, 宋琳, 李明玉, 曾小龙, 于奇志. 有机物/TiO2电荷转移复合物的形成及其在可见光下的催化活性[J]. 华南师范大学学报(自然科学版), 2012, 44(2).
引用本文: 张鑫, 宋琳, 李明玉, 曾小龙, 于奇志. 有机物/TiO2电荷转移复合物的形成及其在可见光下的催化活性[J]. 华南师范大学学报(自然科学版), 2012, 44(2).
THE FORMATION OF CHARGE-TRANSFER-COMPLEX OF ORGANICS/TIO2 AND THEIR EFFECTS ON PHOTOCATALYTIC REDUCTION OF CR6+ UNDER VISIBLE LIGHT IRRADIATION[J]. Journal of South China Normal University (Natural Science Edition), 2012, 44(2).
Citation: THE FORMATION OF CHARGE-TRANSFER-COMPLEX OF ORGANICS/TIO2 AND THEIR EFFECTS ON PHOTOCATALYTIC REDUCTION OF CR6+ UNDER VISIBLE LIGHT IRRADIATION[J]. Journal of South China Normal University (Natural Science Edition), 2012, 44(2).

有机物/TiO2电荷转移复合物的形成及其在可见光下的催化活性

基金项目: 

中央高校基本科研业务费专项;广东高校优秀青年创新人才培育项目;广东省重大科技专项;广州市科技支撑项目;暨南大学科研培育与创新基金青年基金项目

详细信息
    通讯作者:

    张鑫

THE FORMATION OF CHARGE-TRANSFER-COMPLEX OF ORGANICS/TIO2 AND THEIR EFFECTS ON PHOTOCATALYTIC REDUCTION OF CR6+ UNDER VISIBLE LIGHT IRRADIATION

  • 摘要: 以TiO2(Degussa P25)为光催化剂,可见光为激发光源,分别对甲醇/TiO2、甲醛/TiO2、甲酸/TiO2体系中光催化还原Cr6+的情况进行了研究. 结果表明,有机醇和羧酸能与TiO2形成电荷转移复合物. 这种复合物能够吸收400 nm以上的可见光,并通过LMCT(ligand-to-metal charge transfer)机制引发光催化还原反应. 不同的有机物/TiO2体系中,Cr6+的光催化还原反应表现出极大的差异,这种差别与有机物的结构密切相关. 当体系中不存在有机物时,可见光下TiO2几乎不能将Cr6+还原;当加入甲酸,经光照80 min后,Cr6+的还原率即可达100%;而在甲醛/TiO2和甲醇/TiO2体系中,光照6 h后,Cr6+的还原率分别可达93.63%和22.69%. 体系的pH对Cr6+的光催化还原反应有显著影响. 有机物/TiO2体系中,光催化还原Cr6+的反应符合一级动力学规律.
    Abstract: The photocatalytic reductions of Cr6+ in methanol/TiO2, methanal/TiO2 and formic acid/TiO2 systems under visible light irradiation were investigated. The results showed that alcohols and carboxylic acid with TiO2 could form the charge-transfer-complexes which were able to absorb visible light. The photocatalytic reductions of Cr6+ were carried out through ligand-to-metal charge transfer (LMCT) mechanism and their photocatalytic activities were related to the structure of organics. Cr6+ could hardly be reduced by TiO2 without organics under visible light irradiation. The Cr6+conversion was 100% in formic acid/TiO2 systems after 80 min. For the methanal and methanol systems, the Cr6+conversion were 93.63% and 22.69% after 6 h, respectively. The pH value of system significantly affect on the photocatalytic reduction of Cr6+. In organics/TiO2 systems, the photocatalytic reduction of Cr6+ conformed to the first-order kinetic equation.
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出版历程
  • 收稿日期:  2011-12-30
  • 修回日期:  2012-01-13
  • 刊出日期:  2012-05-24

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