Preparation and photocatalytic properties of porous C and N co-doped TiO2 deposited on brick by a fast, one-step microwave irradiation method.
Preparation and photocatalytic properties of porous C and N co-doped TiO2 deposited on brick by a fast, one-step microwave irradiation method.
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DOI：
10.1016/j.jes.2017.03.042
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发表时间：
2017-10
影响因子：
6.9
通讯作者：
Fangzhou Li;Jiang-Huai Zhou;Chun Du;Wei Li;Yinzhen Wang;Guannan He;Qinyu He
中科院分区：
文献类型：
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作者：
Fangzhou Li;Jiang-Huai Zhou;Chun Du;Wei Li;Yinzhen Wang;Guannan He;Qinyu He
采用微波辐射法一步存款碳氮共掺杂TiO 2（（C，N）-TiO 2）在工业砖（（C，N）-TiO 2/砖）上。采用X射线衍射、紫外-可见漫反射光谱、光致发光光谱、X射线光电子能谱和扫描电子显微镜对样品进行了表征。一个选择性的技术也被用来调查的浓度的羟基自由基在紫外可见光照射的甲基橙子溶液与所制备的样品。C和N掺杂剂增强了可见光吸收，并为光生电子-空穴对提供了更长的寿命。SEM照片显示，所制备的样品是多孔的。对（C，N）-TiO 2/砖的暗吸附和光降解实验表明，其具有良好的光降解性和可回收性。最佳光降解率为94%，在2小时。即使在第6次循环后，仍保持最大降解速率。结果表明，（C，N）-TiO 2薄膜具有良好的光催化性能，这主要是由于（C，N）-TiO 2薄膜的多孔结构增强了对可见光的吸收，增强了对污染物的吸附，并延长了光生电子-空穴对的寿命。（C，N）-TiO 2/砖具有成本低、光降解性好、可回收性好等优点，在光降解过程中具有潜在的商业应用价值。
A one-step microwave irradiation method was used to deposit carbon and nitrogen co-doped TiO2((C, N)-TiO2) on commercial brick ((C, N)-TiO2/brick). The as-prepared samples were characterized by X-ray diffraction, ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy (SEM). A selective technique was also used to investigate the concentration of hydroxyl radicals during UV–vis irradiation of the Methyl Orange solution with the as-prepared samples. The C and N dopants enhanced visible light absorption and provided a longer lifetime for the photo-generated electron–hole pairs. The SEM images showed that the as-prepared sample is porous. The dark adsorption and photodegradation test for (C, N)-TiO2/brick showed good photodegradation and good recyclability. The best photodegradation rate was 94% after 2 hr. The maximum degradation rate was maintained even after the 6th cycle. The good photocatalytic properties are attributed to the enhanced visible light absorption, enhanced pollutant adsorption arising from the porous structure of the (C, N)-TiO2thin film, and longer lifetime of the photo-generated electron–hole pairs. (C, N)-TiO2/brick should have potential commercial applications in photodegradation processes because of its low cost, good photodegradation, and excellent recyclability.