以纯钛和2种不同钛合金(Ti-0.2Pd和Ti-6Al-4V)为基材,通过阳极氧化法制备了3种不同组分的钛基氧化物纳米管阵列。采用SEM,EIS,XRD,EDS,ICP,XPS和UV-Vis DRS等测试手段分析3种纳米管阵列的组装过程和性能。EDS和XPS测试表明Al和V以氧化物形式存在,其含量与初始基材基本一致。ICP测试确定了Pd的存在以及含量。3种纳米管阵列的光催化性能通过光催化降解硝基苯酚来测定。Al和V掺杂抑制了TiO2纳米管阵列的光催化降解有机物性能,而Pd掺杂显著提高了纳米管阵列的光催化降解有机物性能。Pd掺杂不但可以增强光吸收性能,还能促进光生载流子的分离,而Al和V过量掺杂会引起结构缺陷并构成了复合中心,导致光生载流子难以分离。Pd掺杂的TiO2纳米管阵列具有抗S毒化的特性和优良的循环性能。研究结果表明直接阳极氧化Ti-0.2Pd合金能制备出功能高效、适于环境领域应用的光催化材料。
Abstract
In this study, three types of Ti-based single/composite oxide nanotube arrays are prepared by anodic oxidation of Ti and typical Ti alloys (Ti-0.2Pd and Ti-6Al-4V). The different fabrication processes and properties of these oxide nanotube arrays are analyzed using SEM, EIS, XRD, EDS, ICP, XPS and UV-Vis DRS. Their photocatalytic activities are determined by degradation of p-nitrophenol in aqueous solution under UV light irradiation. Al and V inside the Ti-6Al-4V alloy-derived nanotube arrays are detected by EDS or XPS. Pd inside the Ti-0.2Pd alloy-derived nanotube arrays cannot be detected by EDS or XPS, but is quantitatively determined by ICP analysis. Incorporation of Al and V significantly deteriorates the photoreactivity of the resultant nanotube arrays, while incorporation of Pd remarkably improves the photocatalytic activity of the resultant titania nanotube arrays powder. The presence of Pd element not only enhances the light absorption, but also facilitates the sulfur poison resistance and the separation of photogenerated charge carriers. Excessive dosage of Al and V element results in structure defect as recombination center and limits the separation of photogenerated charge carriers. This study suggests that anodization of Ti-0.2Pd alloy, rather than pure Ti metal, allows to produce high-performance photocatalysts for environmental and energy applications.
关键词
纳米管阵列 /
阳极氧化法 /
钛合金 /
光催化降解 /
抗S毒化特性
Key words
nanotube arrays /
anodic oxidation /
Ti alloys /
photocatalysis /
sulfur poison resistance
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基金
国家自然科学基金青年基金项目(51709011)
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