Photocatalysts with Tunnel Structures for Decomposition of Orgnic Compounds

用于分解有机化合物的隧道结构光催化剂

基本信息

批准号：
07555249
负责人：
INOUE Yasunobu
金额：
$ 3.9万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

In sn attempt to develop a photocatalyst which has high dfficiency for the decomposition of toluene and water, alkaline metal bexa-titanates, M_2Ti_6O_<13> (M=Na, K,Rb) with a rectangular tunnel structute barium tetra-titanate, BaTi_4O_9, with a pentagonal-prism tunnel structure were combined with transition metals (Mn, Pt, Cu, Co, Fe, Ru, Ir, Ta) and their oxides. The decomposition of toluene on these photocatalysys wsa examined for gaseous mixtures of air-toluene and air-toluene-water. The highest photocatalytic activity wsa obtained for a RuO_2/BaTi_4O_9system in the presence of water, thus indicating that the decomposition of water is an important step in the reaction. A sol-gel method was employed to the preparation of fine BaTi_4O_9 particles. Upon heat treatment, the crystallization of the prepared gels occurred at around 873 K.Well-crystallized BaTi_4O_9 showed a single Raman peak at 860cm^<-1>, characteristic of a double bond-like short Ti-O bond and resulted in the enhancement of the photocatalytic activity for water decomposition. ESR spectra showed that active BaTi_4O_9 produced a signal with g=2.018 and g=2.004 at 77 K under UV irradiation in the presence of oxygen. This signal was assigned to a surface lattice O-radical which is proposed to be responsible for the photocatalysis as a hole trap center. The tunnel structure titanates are concluded to be useful for the development of photocatalysts with high efficiency for oxidation reactions.

SN尝试开发一种光催化剂，该光催化剂具有很高的甲苯和水分解，碱性金属bexa-titanates，M_2TI_6O__ <13>（M = Na，K，RB），带有矩形隧道结构型钡tetra-tetra-tetra-Titanate，Bati_4O_9，Bati_4o_9，Bati_4o_9，bati_4o_9，bati_4o_9，bati_4o_9，bati_4o_9，将五边形 - 普里斯通道结构与过渡金属（Mn，Pt，Cu，Co，Fe，Ru，ru，ir，Ta）及其氧化物结合在一起。甲苯对这些光生的WSA的分解，检查了空气 - 托林和空气 - 托林 - 水的气态混合物。在水存在下为RUO_2/BATI_4O_9SYSTEM获得的最高光催化活性WSA，因此表明水的分解是反应中的重要一步。使用Sol-gel方法来制备精细的BATI_4O_9颗粒。热处理后，制备的凝胶的结晶发生在约873 k左右。结晶的bati_4o_9显示出一个在860cm^<-1>时的拉曼峰，这是双键样短ti-o键的特征，并导致了增强水分解的光催化活性。 ESR光谱表明，在氧气存在下，在紫外线照射下，活性BATI_4O_9在77 K时产生了G = 2.018，G = 2.004的信号。该信号被分配给表面晶格O-Ar-Radical，该信号被提议作为孔陷阱中心的光催化负责。总体而言，隧道结构滴虫对于具有高效率的氧化反应效率的光催化剂有用。