A Facile One-Step Synthesis of Fe-Doped g-C3N4 Nanosheets and Their Improved Visible-Light Photocatalytic Performance
A Facile One-Step Synthesis of Fe-Doped g-C3N4 Nanosheets and Their Improved Visible-Light Photocatalytic Performance
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Fe掺杂g-C3N4纳米片的简便一步合成及其改进的可见光光催化性能
DOI：
10.1002/cctc.201700492
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发表时间：
2017-05-10
期刊：
影响因子：
4.5
通讯作者：
Kong, Yan
中科院分区：
文献类型：
--
作者：
Gao, Jingtian;Wang, Yun;Kong, Yan
以NH 4Cl为动态模板剂，FeCl 3为Fe源，设计了一种简单的一步热解法（与常规的液相剥离和浸渍法相比）制备Fe掺杂的石墨氮化碳（g-C3 N4）纳米片。XPS和DRS结果表明，Fe物种可能以Fe 3+的形式存在，并与N原子形成Fe-N键，从而扩大了g-C3 N4纳米片的可见光吸收区，降低了带隙。掺杂一定量的Fe可以促进片状结构的剥离，进一步提高比表面积，但过量的Fe会破坏片状结构。优化后的Fe掺杂g-C3 N4纳米片的比表面积达到236.52m2·g-1，是纯g-C3 N4纳米片的2.5倍。在所制备的各种光催化剂中，0.5wt%FeCl3的样品在可见光照射下对亚甲基蓝的降解和水的分解表现出最大的光催化性能。MB的降解率分别比纯g-C3 N4纳米片和本体g-C3 N4的降解率高约1.4和1.7倍。H-2产生速率为536 μ molh（-1）g（-1），这分别是纯g-C3 N4纳米片和本体g-C3 N4的1.8和6倍。
A simple one-step pyrolysis process (compared with the routine method of liquid exfoliation and impregnation) was designed to synthesize Fe-doped graphitic carbon nitride (g-C3N4) nanosheets with NH4Cl as dynamic gas template and FeCl3 as the Fe source. Results of XPS and DRS indicated that the Fe species might exist at the state of Fe3+ and form Fe-N bonds with N atoms, thereby expanding visible light absorption regions and reducing the band gap of g-C3N4 nanosheets. Doping certain amounts of Fe could promote the exfoliation and further increase the specific surface area, while excessive Fe might break the sheet structure. The specific surface area of the optimized Fe-doped g-C3N4 nanosheets reached 236.52 m(2)g(-1), which was 2.5times higher than that of g-C3N4 nanosheets. Among various photocatalysts prepared, the sample (0.5wt% FeCl3) exhibited maximum photocatalytic performance in degradation of Methylene Blue and water splitting under visible light irradiation. The degradation rate of MB was about 1.4 and 1.7 times higher than that of pure g-C3N4 nanosheets and bulk g-C3N4, respectively. The H-2 production rate was 536 mu molh(-1)g(-1), which was 1.8 and 6 times higher than that of pure g-C3N4 nanosheets and bulk g-C3N4, separately.