Visible-Light-Responsive TiO2-Coated ZnO:I Nanorod Array Films with Enhanced Photoelectrochemical and Photocatalytic Performance
Visible-Light-Responsive TiO2-Coated ZnO:I Nanorod Array Films with Enhanced Photoelectrochemical and Photocatalytic Performance
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DOI：
10.1021/acsami.5b00980
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发表时间：
2015-03-25
影响因子：
9.5
通讯作者：
Chen, Jian-Feng
中科院分区：
文献类型：
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作者：
Wang, Yuan;Zheng, Yan-Zhen;Chen, Jian-Feng
控制结构和组成特性，在一个多功能的可见光活性氧化锌基光催化剂的制造过程中是一个关键的一步，以改善光催化污染物降解过程。在这项工作中，我们报告了一种多功能光催化电极，即，采用水热法和湿化学法制备了TiO 2包覆ZnO：I纳米棒（ZnO：I/TiO 2 NRs）阵列薄膜。这种类型的混合光催化膜不仅增强了光吸收与碘的掺入，但也具有增加的电子传输能力和优异的化学稳定性所产生的独特的二氧化钛涂层的一维结构。由于这些协同优势，ZnO：I样品的降解效率达到，类似于97%，照射6小时后，效率比纯ZnO高62%。对于RhB在酸性（pH = 3）和碱性（pH = 11）溶液中的光催化降解实验，以及在重复光降解实验中，ZnO：I/TiO 2 NRs膜在可见光照射下表现出高稳定性和耐久性。因此，ZnO：I/TiO 2纳米棒被认为是一种很有前途的光催化材料，可以降解水生态环境中的有机污染物。
Control of structural and compositional characteristics during fabrication of a versatile visible-light active ZnO-based photo catalyst is a crucial step toward improving photocatalytic pollutant degradation processes. In this work, we report a multifunctional photocatalytic electrode, i.e., TiO2 coated ZnO:I nanorods (ZnO:I/TiO2 NRs) array films, fabricated via a hydrothermal method and a subsequent wet-chemical process. This type of hybrid photocatalytic film not only enhances light absorption with the incorporation of iodine but also possesses increased electron transport capability and excellent chemical stability arising from the unique TiO2-coated 1D structure. Owing to these synergic advantages, the degradation efficiency of the ZnO:I samples reached, similar to 97% after irradiation for 6 h, an efficiency 62% higher than that of pure ZnO. For RhB photocatalytic degradation experiments in both acidic (pH = 3) and alkaline (pH = 11) solutions, as well as in repeat photodegradation experiments, the ZnO:I/TiO2 NRs films demonstrated high stability and durability under visible-light irradiation. Thus, ZnO:I/TiO2 NRs are considered a promising photocatalytic material to degrade organic pollutants in aqueous eco-environments.