Synergistic effect of N-decorated and Mn(2+) doped ZnO nanofibers with enhanced photocatalytic activity.
Synergistic effect of N-decorated and Mn(2+) doped ZnO nanofibers with enhanced photocatalytic activity.
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N修饰和Mn2+掺杂ZnO纳米纤维的协同效应增强光催化活性
DOI：
10.1038/srep32711
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发表时间：
2016-09-07
影响因子：
4.6
通讯作者：
Pan W
中科院分区：
文献类型：
--
作者：
Wang Y;Cheng J;Yu S;Alcocer EJ;Shahid M;Wang Z;Pan W
本文报道了一种高效光催化剂，即富含空位缺陷的掺杂Mn2+和N修饰的氧化锌纳米纤维，它是通过静电纺丝和随后的控制退火法制备的。该纳米催化剂具有优异的可见光催化活性，表观量子效率高达12.77%，是纯氧化锌的50倍。在反复的光催化降解实验中也表现出良好的稳定性和耐用性。综合结构分析表明，纳米纤维表面引入了高密度的氧空位和氮。因此，由于Mn2+掺杂和N修饰的协同作用，Mn2+掺杂显著提高了Mn2+的可见光光催化性能。进一步的研究表明，在氮气气氛中热处理时，Mn2+掺杂促进了N修饰和表面缺陷的形成。氮掺杂导致氧化锌纳米纤维的大禁带宽度减小，从而显着提高了其在可见光范围内的吸收。综上所述，本文提供了一种在缺氧环境下同时使用掺杂和退火法制备可见光纳米催化剂的新方法。
Here we report a high efficiency photocatalyst, i.e., Mn2+-doped and N-decorated ZnO nanofibers (NFs) enriched with vacancy defects, fabricated via electrospinning and a subsequent controlled annealing process. This nanocatalyst exhibits excellent visible-light photocatalytic activity and an apparent quantum efficiency up to 12.77%, which is 50 times higher than that of pure ZnO. It also demonstrates good stability and durability in repeated photocatalytic degradation experiments. A comprehensive structural analysis shows that high density of oxygen vacancies and nitrogen are introduced into the nanofibers surface. Hence, the significant enhanced visible photocatalytic properties for Mn-ZnO NFs are due to the synergetic effects of both Mn2+ doping and N decorated. Further investigations exhibit that the Mn2+-doping facilitates the formation of N-decorated and surface defects when annealing in N2 atmosphere. N doping induce the huge band gap decrease and thus significantly enhance the absorption of ZnO nanofibers in the range of visible-light. Overall, this paper provides a new approach to fabricate visible-light nanocatalysts using both doping and annealing under anoxic ambient.
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