Chen Dayong, Huang Shoushuang, Huang Ruting, Zhang Qian, Le Thanh-Tung, Cheng Erbo, Yue Rong, Hu Zhangjun, Chen Zhiwen
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China; School of Chemical and Material Engineering, Chizhou University, Chizhou 247100, People's Republic of China.
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China.
J Hazard Mater. 2019 Apr 15;368:204-213. doi: 10.1016/j.jhazmat.2019.01.009. Epub 2019 Jan 7.
Construction of heterostructures with proper band alignment and effective transport and separation of photogenerated charges is highly expected for photocatalysis. In this work, Ni-doped SnO-SnS heterostructures (NiSnSO) are simply prepared by thermal oxidation of Ni-doped hierarchical SnS microspheres in the air. When applied for the photodegradation of organic contaminants, these NiSnSO exhibit excellent catalytic performance and stability due to the following advantages: (1) Ni doping leads to the enhancement of light harvesting of SnS in the visible light regions; (2) the formed heterojunctions promote the transport and separation of photogenerated electrons from SnS to SnO; (3) Ni-SnO quantum dots facilitate the enrichment of reactants, provide more reactive centers and accelerate product diffusion in the reactive centers; (4) the SnS hierarchical microspheres constituted by nanoplates provide abundant active sites, high structural void porosity and accessible inner surface to faciliate the catalytic reactions. As a result, the optimized NiSnSO can photodegrade 92.7% methyl orange within 80 min under the irradiation of simulated sunlight, greatly higher than those of pure SnS (29.8%) and Ni-doped SnS (52.1%). These results reveal that the combination of heteroatom doping and heterostructure fabrication is a very promising strategy to deliver nanomaterials for effectively photocatalytic applications.
构建具有合适能带排列以及光生电荷有效传输与分离的异质结构对于光催化来说是非常令人期待的。在这项工作中，通过在空气中对镍掺杂的分级结构硫化锡微球进行热氧化，简单地制备了镍掺杂的氧化锡 - 硫化锡异质结构（NiSnSO）。当应用于有机污染物的光降解时，这些NiSnSO由于以下优点而表现出优异的催化性能和稳定性：（1）镍掺杂导致硫化锡在可见光区域的光捕获增强；（2）形成的异质结促进了光生电子从硫化锡到氧化锡的传输和分离；（3）镍 - 氧化锡量子点促进反应物的富集，提供更多的反应中心并加速反应中心内产物的扩散；（4）由纳米片构成的硫化锡分级微球提供了丰富的活性位点、高结构孔隙率和可及的内表面以促进催化反应。结果，优化后的NiSnSO在模拟太阳光照射下80分钟内可光降解92.7%的甲基橙，大大高于纯硫化锡（29.8%）和镍掺杂硫化锡（52.1%）。这些结果表明，杂原子掺杂和异质结构制备的结合是一种非常有前景的策略，可为有效的光催化应用提供纳米材料。
