Sitinjak Elvri Melliaty, Masmur Indra, Hutajulu Poltak Evencus, Marbun New Vita Mey Destty, Gultom Golfrid
Department of Chemical Engineering, Politeknik Teknologi Kimia Industri, Medan 20228, Indonesia.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia.
ACS Omega. 2023 Sep 15;8(38):35328-35335. doi: 10.1021/acsomega.3c05171. eCollection 2023 Sep 26.
In this work, electrospun nanofiber embedded with zinc oxysulfide (Zn(O,S)) has been demonstrated as an efficient and robust photocatalyst for hydrogenation of nitrobenzene to aniline under solar light irradiation at mild conditions with methanol as the hole scavenger. The solid solution state of Zn(O,S) in electrospun nanofiber was successfully revealed by high-resolution transmission electron microscopy and X-ray diffraction analyses in which the lattice fringes and diffraction planes located in between those of ZnO and ZnS phases. Moreover, the electrochemical and optical properties of Zn(O,S) embedded in polyethylene oxide (PEO) nanofiber are found to be better than those of ZnO and ZnS indicating more efficient photocatalytic activities as well. The photocatalytic hydrogenation of nitrobenzene to aniline occurred completely within 2 h of the photocatalytic reaction with a reusability of 95% after five consecutive runs. Finally, the mechanism of photocatalytic hydrogenation by Zn(O,S) embedded in the PEO (PZOS) nanofiber involves a total of six electrons (e) and six protons (H) to hydrogenate nitrobenzene to nitrosobenzene, phenylhydroxylamine, and aniline.
在这项工作中，嵌入氧硫化锌（Zn(O,S)）的电纺纳米纤维已被证明是一种高效且稳定的光催化剂，可在温和条件下，以甲醇作为空穴捕获剂，在太阳光照射下将硝基苯氢化为苯胺。通过高分辨率透射电子显微镜和X射线衍射分析成功揭示了电纺纳米纤维中Zn(O,S)的固溶体状态，其中晶格条纹和衍射平面位于ZnO和ZnS相之间。此外，发现嵌入聚环氧乙烷（PEO）纳米纤维中的Zn(O,S)的电化学和光学性质优于ZnO和ZnS，这也表明其具有更高效的光催化活性。硝基苯光催化氢化为苯胺的反应在光催化反应2小时内完全发生，连续运行五次后可重复使用性达95%。最后，嵌入PEO（PZOS）纳米纤维中的Zn(O,S)光催化氢化的机理总共涉及六个电子（e）和六个质子（H），将硝基苯氢化为亚硝基苯、苯胲和苯胺。
