Lv Manfei, Yang Liuqing, Wang Xiangliang, Cheng Xinlei, Song Yan, Yin Yinkun, Liu Huimin, Han Yongjun, Cao Kesheng, Ma Wei, Qi Guang, Li Songtian
College of Chemistry, Zhengzhou University Zhengzhou 450001 China.
College of Chemistry and Environmental Engineering, Pingdingshan University Pingdingshan 467000 China.
RSC Adv. 2019 Dec 9;9(69):40694-40707. doi: 10.1039/c9ra07562c. eCollection 2019 Dec 3.
A novel polyaniline (PANI)/SnO heterojunction composed of PANI nanofibers and SnO nanosheets was fabricated by a facile physical milling technique. Modification of SnO with a PANI conductive polymer contributes to facilitating interfacial charge transfer efficiency, and thus, significantly enhances the visible-light Rhodamine B (RhB) photo-degradation. Results indicate that PANI/SnO heterostructures with 10 wt% PANI reached the maximum degradation efficiency (around 97%) for RhB within 5 h, which is 2.27 times higher than that of SnO alone. This improvement is due to the p-n heterostructure formation in PANI/SnO. Moreover, the outcome of reactive species capturing experiments demonstrated that in PANI/SnO, holes made the largest contribution to RhB degradation under visible light illumination, while hydroxyl radicals showed less significance under the same conditions. In addition, the photocatalytic mechanism was proposed based on evidence from the reactive species test and energy band structure analysis.
通过简便的物理研磨技术制备了一种由聚苯胺（PANI）纳米纤维和SnO纳米片组成的新型聚苯胺（PANI）/SnO异质结。用PANI导电聚合物对SnO进行改性有助于提高界面电荷转移效率，从而显著增强可见光下罗丹明B（RhB）的光降解性能。结果表明，含10 wt% PANI的PANI/SnO异质结构在5小时内对RhB的降解效率达到最大值（约97%），这比单独的SnO高出2.27倍。这种提高归因于PANI/SnO中形成的p-n异质结构。此外，活性物种捕获实验结果表明，在可见光照射下，PANI/SnO中，空穴对RhB降解的贡献最大，而在相同条件下羟基自由基的作用较小。此外，基于活性物种测试和能带结构分析的证据提出了光催化机理。
