Applications of Single-site Photocatalysts Implanted within the Silica Matrixes of Zeolite and Mesoporous Silica
Applications of Single-site Photocatalysts Implanted within the Silica Matrixes of Zeolite and Mesoporous Silica
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DOI：
10.1246/cl.2007.348
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发表时间：
2007-02
影响因子：
1.6
通讯作者：
H. Yamashita;K. Mori
中科院分区：
文献类型：
--
作者：
H. Yamashita;K. Mori
四面体配位的金属氧化物（钛、钒、铬和钼的氧化物）部分可以被植入并隔离在微孔沸石和介孔二氧化硅材料的二氧化硅基质中，并被称为“单中心光催化剂”。“在紫外光照射下，这些单位点光催化剂形成电荷转移激发态，即，与在半导体材料中产生的电子和空穴相比，彼此非常接近地定位的受激电子-空穴对状态在各种光催化反应中起重要作用。特别地，单中心氧化钛光催化剂在紫外光照射下表现出高的反应性和选择性，而单中心氧化铬作为可见光敏感的光催化剂。这些单活性中心光催化剂不仅可以促进光催化反应，而且可以用于功能材料的合成。具有单中心光催化剂的透明介孔薄膜产生超亲水表面。在紫外光照射下，纳米金属催化剂可以光沉积在激发的单中心光催化剂上。
The tetrahedrally coordinated metal oxide (titanium, vanadium, chromium, and molybdenum oxides) moieties can be implanted and isolated in the silica matrixes of microporous zeolite and mesoporous silica materials and named as "single-site photocatalysts." Under UV-light irradiation these single-site photocatalysts form the charge-transfer excited state, i.e., the excited electron-hole pair state which localizes quite near to each other as compared to the electron and hole produced in semiconducting materials, plays a significant role in various photocatalytic reactions. Especially, the single-site titanium oxide photocatalyst demonstrates the high reactivity and selectivity under UV-light irradiation, while the single-site chromium oxide operates as a visible-light sensitive photocatalyst. These single-site photocatalysts not only can promote photocatalytic reactions but also can be utilized to synthesis of functional materials. The transparent mesoporous thin film with single-site photocatalyst generates the superhydrophilic surface. The nano-sized metal catalyst can be photodeposited on the excited single-site photocatalyst under UV-light irradiation.