Preparation and photocatalytic activity of hierarchically mesoporous-macroporous TiO2−xNx
Preparation and photocatalytic activity of hierarchically mesoporous-macroporous TiO2−xNx
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DOI：
10.1016/j.apcatb.2008.01.026
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发表时间：
2008-08
影响因子：
22.1
通讯作者：
G. Shao;Xue-Jun Zhang;Z. Yuan
中科院分区：
文献类型：
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作者：
G. Shao;Xue-Jun Zhang;Z. Yuan
为了将其光催化应用范围从紫外扩展到可见光，采用尿素溶液热处理自发形成的分级介孔-大孔二氧化钛，制备了分级介孔-大孔N掺杂二氧化钛材料。所得的介孔-大孔TiO 2 − xNx表现出具有高表面积和大孔隙率的双晶（铁钛矿和板钛矿）骨架。随着尿素溶液浓度的增加和氮化温度的升高，掺氮量增加，禁带宽度从3.14 eV变窄到2.48 eV。XPS和FT-IR光谱证实了介孔-大孔TiO 2 − xNx中OTiN键的形成。以甲基橙橙子和罗丹明B为目标染料，分别在紫外光和可见光照射下考察了其光催化活性。在紫外光和可见光的照射下，水污染物的光催化降解活性的显着改善，这是由于氮的引入到二氧化钛晶格和分层介孔-大孔结构的存在。
Hierarchically mesoporous-macroporous N-doped titania materials were fabricated by the thermal treatment of spontaneously formed hierarchical mesoporous-macroporous titanias with urea solution, in order to extend their photocatalytic applications from ultraviolet to visible-light range. The resultant meso-macroporous TiO2−xNxexhibited a bicrystalline (anatase and brookite) framework with high surface area and large porosity. The content of the doped nitrogen increased with the urea solution and the nitridation temperature, and the band gaps narrowed from 3.14 to 2.48eV. The formation of OTiN bonds in the meso-macroporous TiO2−xNxwas confirmed by the XPS and FT-IR spectra. The photocatalytic activity was evaluated by the photodegradation of methyl orange and rhodamine B under UV and visible-light irradiation, respectively. The significant improvement of photocatalytic activity for water contaminant decomposition under both UV and visible-light irradiation was observed, which is due to the incorporation of nitrogen into the titania lattice and the presence of the hierarchical meso-macroporous structure.