Visible Light Photoreduction of CO2 Using CdSe/Pt/TiO2 Heterostructured Catalysts
Visible Light Photoreduction of CO2 Using CdSe/Pt/TiO2 Heterostructured Catalysts
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DOI：
10.1021/jz9000032
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发表时间：
2009-11
影响因子：
5.7
通讯作者：
Congjun Wang;R. Thompson;J. Baltrus;Christopher Matranga
中科院分区：
文献类型：
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作者：
Congjun Wang;R. Thompson;J. Baltrus;Christopher Matranga
合成了一系列CdSe量子点（QD）敏化的TiO 2异质结构，对其进行了表征，并测试了在H2O存在下光催化还原CO2的性能。我们的研究结果表明，这些异质结构材料能够催化光还原CO2使用可见光照明（λ > 420 nm）。还研究了通过退火和使用肼化学处理从CdSe量子点去除表面活性剂帽的效果。光催化还原过程之后，使用红外光谱探测的气相反应物和气相色谱检测的产品。气相色谱分析表明，主要的反应产物是CH 4，与CH 3OH，H2，和CO观察到的次级产物。在可见光照射（λ > 420 nm）后，气相产物的典型产率为48 ppm g−1 h−1的CH 4，3.3 ppm g−1 h−1的CH 3OH（蒸汽），以及痕量的CO和H2。
A series of CdSe quantum dot (QD)-sensitized TiO2 heterostructures have been synthesized, characterized, and tested for the photocatalytic reduction of CO2 in the presence of H2O. Our results show that these heterostructured materials are capable of catalyzing the photoreduction of CO2 using visible light illumination (λ > 420 nm) only. The effect of removing surfactant caps from the CdSe QDs by annealing and using a hydrazine chemical treatment have also been investigated. The photocatalytic reduction process is followed using infrared spectroscopy to probe the gas-phase reactants and gas chromatography to detect the products. Gas chromatographic analysis shows that the primary reaction product is CH4, with CH3OH, H2, and CO observed as secondary products. Typical yields of the gas-phase products after visible light illumination (λ > 420 nm) were 48 ppm g−1 h−1 of CH4, 3.3 ppm g−1 h−1 of CH3OH (vapor), and trace amounts of CO and H2.