Mesoporous Ta3N5 Microspheres Prepared from a High-Surface-Area, Microporous, Amorphous Precursor and Their Visible-Light-Driven Photocatalytic Activity
Mesoporous Ta3N5 Microspheres Prepared from a High-Surface-Area, Microporous, Amorphous Precursor and Their Visible-Light-Driven Photocatalytic Activity
复制标题
高比表面积、微孔、无定形前驱体制备的介孔 Ta3N5 微球及其可见光驱动的光催化活性
DOI：
10.1002/chem.201301052
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发表时间：
2013-09-16
影响因子：
4.3
通讯作者：
Cao, Minhua
中科院分区：
文献类型：
--
作者：
Cao, Jing;Ren, Ling;Cao, Minhua
在过去的十年中，氮化钽（Ta3N5）因其具有2.08 eV的窄带隙（对应于高达600 nm的光吸收）而引起了广泛的关注，这一特性使其适用于可见光驱动的光催化剂。[1-6]换句话说，它可以收集超过45%的太阳能，这个值比一些典型的氧化物基材料还要高。 可见光驱动的光催化剂，例如 (Ga1-xZnx) ACHTUNGTRENNUNG (N1-xOx)[7] 和 In1-xNixTaO4,[8]，因此 Ta3N5 最近成为最有吸引力的光催化剂之一。自2002年首次报道大块Ta3N5的光催化活性以来，[3]许多研究集中在设计各种Ta3N5纳米结构以提高其光催化活性，因为大块Ta3N5的光催化活性相对较差。例如，Ta3N5的纳米颗粒（NPs）、介孔纳米颗粒、纳米管阵列、空心球和介孔微孔空心球已被成功合成，同时证实与块状对应物相比表现出更高的光催化活性。[9-14]在这些报道的Ta3N5纳米结构中，介孔结构具有最好的光催化活性。 催化活性。这是因为催化剂的介孔性可以极大地增强反应物分子与催化活性位点的接触，从而产生高催化活性。因此，设计和合成介孔Ta3N5是实现更高催化性能的重要策略。传统的Ta3N5合成主要基于氮、氨或氢/氮混合物与金属Ta、其氧化物或氯化物的高温反应，通常在10008C左右的温度下进行。[2,15,16]最严重的缺点是 这些制备方法缺乏对结晶度和粒径的控制，因此合成的Ta3N5普遍尺寸较大，比表面积较小。为了克服这些问题，模板，例如聚（苯乙烯-共-丙烯酸-
In the past decade, tantalum nitride (Ta3N5) has attracted extensive attention because it possesses a narrow band gap of 2.08 eV, corresponding to light absorption up to 600 nm, a property that makes it suitable for a visible-light-driven photocatalyst.[1–6] In other words, it can collect more than 45% of the solar energy, a value that is larger than that of some typical oxide-based visible-light-driven photocatalysts, such as (Ga1ÀxZnx) ACHTUNGTRENNUNG (N1ÀxOx)[7] and In1ÀxNixTaO4,[8] and therefore Ta3N5 has recently become one of the most attractive photocatalysts. Since the first report on the photocatalytic activity of bulk Ta3N5 in 2002,[3] many studies have focused on designing various Ta3N5 nanostructures to improve their photocatalytic activity as bulk Ta3N5 has relatively poor photoACHTUNGTRENNUNGcat-ACHTUNGTRENNUNGalytic activity. For example, nanoparticles (NPs), mesoporous NPs, nanotube arrays, hollow spheres, and meso-microporous hollow spheres of Ta3N5 have been successfully synthesized and at the same time confirmed to exhibit improved photocatalytic activity compared with their bulk counterparts.[9–14] Among these reported Ta3N5 nanostructures, mesoporous structures possess the best catalytic activity. This is because the mesoporosity of the catalysts can greatly enhance access of reactant molecules to the catalytically active sites, thus resulting in high catalytic activity. Therefore, designing and synthesizing mesoporous Ta3N5 is an important strategy for achieving higher catalytic performance.Conventional synthesis of Ta3N5 is mainly based on the high-temperature reaction of nitrogen, ammonia, or a hydrogen/nitrogen mixture with metallic Ta, its oxide, or its chloride, usually at temperatures around 10008C.[2, 15, 16] The most serious disadvantage associated with these preparation methods is the lack of control over crystallinity and particle size, and therefore the thus-synthesized Ta3N5 generally has a large size and a small specific surface area. To overcome these problems, templates, such as poly (styrene-co-acryl-