Fabrication of carbon nanotube-loaded TiO₂@AgI and its excellent performance in visible-light photocatalysis

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• 作者：Liu Yang ; Yang An ; Bin Dai ; Xuhong Guo…
• 关键词：Titanium Dioxide ; Carbon Nanotubes ; Silver Iodide ; Photocatalysis
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：34
• 期：2
• 页码：476-483
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Industrial Chemistry/Chemical Engineering; Catalysis; Materials Science, general; Biotechnology;
• 出版者：Springer US
• ISSN：1975-7220
• 卷排序：34

文摘

Novel, visible light driven CNTs-TiO₂@AgI hybrid materials were synthesized by a simple solvothermaldissolution-precipitation method, during which the acid vapor treated carbon nanotubes (CNTs) as template, AgI as sensitizer and TiO₂ as the bridge unified them to form a ternary composite. The morphology and chemical components of as-prepared samples were characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). XRD and XPS characterizations indicated that anatase TiO₂ and crystal AgI co-existed in the composite. HRTEM demonstrated CNTs were decorated with well-dispersed AgI and TiO₂ nanoparticles (NPs), and TiO₂ had an intimate connection with both AgI and CNTs. Diffusive reflectance UV-vis spectroscopy of CNTs-TiO₂@AgI nanocomposite was extended to the whole UV-visible region due to adding of CNTs and AgI NPs. Degradation of Rhodamine B (RhB) polluted water using CNTs-TiO₂@AgI NPs was carried out under visible light irradiation, and it showed higher degradation efficiency than CNTs-TiO₂, TiO₂@AgI, and CNTs@AgI NPs. The primary reason for the enhanced photocatalytic property was attributed to the synergic effect in CNTs-TiO₂@AgI, which included the good adsorption ability and electrical conductivity of CNTs as well as the intimate connection and hetero-junctions among AgI, TiO₂, and CNTs. Meanwhile, the as-prepared hybrid materials can be easily separated and reclaimed from the liquid phase, and the recycling tests indicated CNTs-TiO₂@AgI had renewable performance.