光化学合成多孔二氧化钛的室温晶化过程的研究
详细信息 查看官网全文
- 英文论文题名：Room-temperature crystallization of photo-induced porous titania
- 论文作者：苏娟
- 英文论文作者：Juan Su ; School of Physical Science and Technology ; Shanghai Tech University
- 年：2016
- 作者机构：上海科技大学物质科学与技术学院;
- 论文关键词：二氧化钛 ; 室温晶化 ; 光催化 ; 光化学合成
- 英文论文关键词：titania ; Room-temperature crystallization ; photocatalysis ; photochemical synthesis
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十二分会： 多孔功能材料
- 语种：中文
- 分类号：TQ134.11
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十二分会 ; 多孔功能材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：254k
- 原文格式：D
- 会议级别：全国
摘要
温和的反应路径的开发在有机和无机合成领域已经越来越受到关注。这不仅避免了环境污染和环境破坏,同时也降低了成本,减少了能源浪费。然而,多孔功能材料的合成不可避免地需要热处理过程。这不仅违背了绿色化学的理念,更导致孔道结构和比表面积的损失,削弱材料的性能。通过光化学合成法获得的具有超大比表面积的多孔无定形二氧化钛(Am-TiO_2),经过80~90天的室温晶化过程,成功转化为锐钛矿相多孔二氧化钛(R-TiO_2)。室温晶化过程在没有任何溶剂、添加剂和催化剂参与下自发完成(Fig.1)1。R-TiO_2被证明具有非常优异的光催化分解水产氢活性,产氢效率是工业P25的2.4倍。这要归功于室温的晶化路径使材料保留了大比表面积(400 m~2/g)和低温稳定晶相(光催化优势晶相——锐钛矿相)。光化学合成法获得的Am-TiO_2前驱体是实现室温晶化的关键。无定形二氧化钛向锐钛矿相二氧化钛转化的固相晶化机制,主要是通过无序聚集的TiO_6八面体表面羟基桥联,实现TiO_6八面体的共面有序排列2。光合成的Am-TiO_2具有的大比表面积和丰富的表面羟基为TiO_6八面体的桥联和有序排列提供了更多的机会。在后期的研究中也成功地通过引入活性中心,使多孔二氧化钛的室温晶化时间有效地缩短。该研究工作为设计温和的材料合成路径路径提供了参考,同时也为开发性能优异的半导体材料提供了新的思路。
The search for energy-efficient chemical processes becomes increasing significant in inorganic or organic synthesis.Such mild synthetic route can effectively reduce environmental pollution,cost and energy waste.For the synthesis of porous functional materials,thermal treatment is essential,but often leads to an obvious decrease of surface area or porosity,adversely affects their performance.Through photochemical synthesis,amorphous porous titania with large surface area(Am-TiO_2) were prepared and crystallized to anatase(An-TiO_2) via room-temperature crystallization process under solvent-,additive-,and catalyst-free condition for 80 to 90 days(Fig.1).1.The as-obtained An-TiO_2 material possesses a large surface area of 400 m~2/g,and a high photocatalytic activity which is more than twice that of the benchmark P25 TiO_2.The success of room-temperature crystallization should mainly attribute to the special precursor Am-TiO_2.Both its large surface area and rich surface hydroxyl groups increase the opportunities of TiO_6-bridging in the form of face-sharing.~2
The search for energy-efficient chemical processes becomes increasing significant in inorganic or organic synthesis.Such mild synthetic route can effectively reduce environmental pollution,cost and energy waste.For the synthesis of porous functional materials,thermal treatment is essential,but often leads to an obvious decrease of surface area or porosity,adversely affects their performance.Through photochemical synthesis,amorphous porous titania with large surface area(Am-TiO_2) were prepared and crystallized to anatase(An-TiO_2) via room-temperature crystallization process under solvent-,additive-,and catalyst-free condition for 80 to 90 days(Fig.1).1.The as-obtained An-TiO_2 material possesses a large surface area of 400 m~2/g,and a high photocatalytic activity which is more than twice that of the benchmark P25 TiO_2.The success of room-temperature crystallization should mainly attribute to the special precursor Am-TiO_2.Both its large surface area and rich surface hydroxyl groups increase the opportunities of TiO_6-bridging in the form of face-sharing.~2
引文
[1]Su,J.Zou,X.X.Li,G.D.Jiang,Y.M.Cao,Y.Zhao,J.Chen,J.S.Chem.Commun.2013,49:8217.
[2]Yanagisawa,K.Ovenstone,J.J.Phys.Chem.B 1999,103:7781.
[2]Yanagisawa,K.Ovenstone,J.J.Phys.Chem.B 1999,103:7781.