文献类型：期刊文献

英文题名：Multi-heterojunction of SnO2/Bi2O3/BiOI nanofibers: Facile fabrication with enhanced visible-light photocatalytic performance

作者：Wang, Kai[1];Qian, Zhongyu[1];Guo, Weihong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Polymer Proc Lab,Key Lab Preparat & Applicat Ultr, Shanghai 200237, Peoples R China

年份：2019

卷号：111

起止页码：202

外文期刊名：MATERIALS RESEARCH BULLETIN

收录：;EI(收录号：20184806140858);WOS:【SCI-EXPANDED(收录号:WOS:000456755600028)】；

语种：英文

外文关键词：Multi-heterojunction; Tin dioxide; Bismuth oxyiodide; Bismuth trioxide; Photocatalysis

摘要：One dimensional multi-heterojunction SnO2/Bi2O3/BiOI nanofibers were successfully fabricated by electrospinning and chemical etching method at room temperature. The BiOI nanosheets were uniformly immobilized on the surface of heterojunction nanofibers through I- ion etching process. The as-prepared samples were measured by X-ray diffraction (XRD), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflection spectroscopy (DRS), photoluminescence (PL) and Brunauer-Emmett-Teller (BET) analysis. Comparing with Bi2O3, BiOI and SnO2/ Bi2O3, the multi-heterojunction SnO2/Bi2O3/BiOI nanofibers exhibited higher photocatalytic activity for the removal of methyl orange (MO) and Cr (VI) ions under visible light irradiation. The photocatalytic activity of NFs-15 for the removal of MO and Cr (VI) ions increased by 3.15 and 6.38 times compared with SnO2/Bi2O3. Besides, the XRD spectra of NFs-15 before and after irradiation confirmed the cycling stability of the photo catalysts. A possible mechanism of photocatalytic degradation was also proposed. Moreover, the formation of multi-heterojunctions with large specific surface area facilitated the generation, separation and reaction of photoinduced electron-hole pairs. This work provided a new strategy to design multi-heterojunction photo catalysts for environmental remediation.