Sulfur-doped g-C3N4 nanosheets with carbon vacancies: General synthesis and improved activity for simulated solar-light photocatalytic nitrogen fixation
Sulfur-doped g-C3N4 nanosheets with carbon vacancies: General synthesis and improved activity for simulated solar-light photocatalytic nitrogen fixation
复制标题
具有碳空位的硫掺杂 g-C3N4 纳米片：模拟太阳光光催化固氮的一般合成和改进活性
DOI：
10.1016/j.cej.2018.07.116
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发表时间：
2018-12-01
影响因子：
15.1
通讯作者：
Wang, Xin
中科院分区：
文献类型：
--
作者：
Cao, Shihai;Fan, Bin;Wang, Xin
通过直接收集硫脲的气相产物，在自生NH3气氛下制备了超薄的横向尺寸大且含有碳空位的掺硫g-C3 N4多孔纳米片（SCNNSs）。NH3气氛促进了具有分级孔结构和高比表面积的硫掺杂g-C3 N4纳米片的形成。在SCNNSS中也产生了碳空位，而没有显着改变整体化学结构。在模拟太阳光照射下，SCNNSs-550在4 h内的光催化固氮速率为5.99mMh（-1）gCat（-1），是SCN的2.8倍。SCNNSs的这种上级光催化性能归因于硫掺杂和碳空位的多孔片状结构，这为表面反应提供了许多活性位点，并提高了电荷-载流子分离速率。这种新的合成方法提供了一种简单而有效的方法来掺杂非金属和形成缺陷结构的g-C3 N4优良的光催化性能。
Ultrathin sulfur-doped g-C3N4 porous nanosheets (SCNNSs) with large lateral size and carbon vacancies were obtained by directly collecting the gaseous product of thiourea under a self-generated NH3 atmosphere. The NH3 atmosphere promoted the formation of sulfur doped g-C3N4 nanosheets with a hierarchical pore structure and a high specific surface area. Carbon vacancies were also generated in the SCNNSs without notably changing the overall chemical structure. The obtained SCNNSs-550 showed a photocatalytic nitrogen fixation rate of 5.99mMh(-1) gCat(-1) under simulated sunlight irradiation within 4 h, which is 2.8 times as high as that of bulk SCN. This superior photocatalytic performance of SCNNSs was attributed to the porous sheet structure with sulfur doping and carbon vacancies, which provide many active sites for surface reactions and increase the charge-carrier separation rate. This novel synthetic method provides a simple and efficient way to dope nonmetals and form a defect structure in g-C3N4 for excellent photocatalytic performance.