Synthesis, Characterization, and Photocatalytic Properties of SnO2/Rutile TiO2/Anatase TiO2 Heterojunctions Modified by Pt
Synthesis, Characterization, and Photocatalytic Properties of SnO2/Rutile TiO2/Anatase TiO2 Heterojunctions Modified by Pt
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DOI：
10.1021/jp506495a
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发表时间：
2014-09
影响因子：
3.7
通讯作者：
Weirong Zhao;Meng Zhang;Zhuyu Ai;Yanan Yang;Haiping Xi;Q. Shi;Xinhua Xu;Huixian Shi
中科院分区：
文献类型：
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作者：
Weirong Zhao;Meng Zhang;Zhuyu Ai;Yanan Yang;Haiping Xi;Q. Shi;Xinhua Xu;Huixian Shi
为了提高光生电子与空穴的分离率，采用水热法制备了具有三对异质结的Pt纳米粒子修饰的SnO2/金红石型TiO2 (R-TiO2)/锐钛矿型TiO2 （a -TiO2）光催化剂。透射电子显微镜（TEM）和高分辨率透射电子显微镜（HRTEM）清楚地显示了三对异质结相互连接的结构。随着比表面积的增加，杂碳结构光催化剂在接触污染物时可以提供更多的活性位点，从而提高光催化活性。紫外-可见漫反射光谱（DRS）中的红移表明了对可见光的利用。光致发光（PL）和光电化学（PEC）测量结果表明，在4小时的光催化氧化过程中，分解甲苯的电子和空穴分离得到了增强。% SnO2/R-TiO2/A-TiO2
To improve the separation rate of photogenerated electrons and holes, a SnO2/rutile TiO2 (R-TiO2)/anatase TiO2 (A-TiO2) photocatalyst modified by Pt nanoparticles with three pairs of heterojunctions was fabricated by a facile hydrothermal method. Transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) clearly illustrated the structure of the three pairs of heterojunctions connected to each other. Heteronanostructure photocatalysts with increased specific surface area could offer more active sites when contacting pollutants, resulting in improved photocatalytic activity. The red shift in UV–vis diffuse reflectance spectra (DRS) indicated the utilization of visible-light. Photoluminescence (PL) and photoelectrochemical (PEC) measurements suggested the enhancement of electron and hole separation, in accordance with the results obtained for the photocatalytic oxidation of decomposing toluene over 4 h. A catalyst containing 1 wt % Pt/10 at. % SnO2/R-TiO2/A-TiO2 exhib...