Investigation of electron beam irradiation on In2S3-MxInySz (M = Bi or La) Z-scheme heterojunctions for efficient and stable degradation of water pollutants
| Autor: | Jing Wang, Uche Omeoga, Tianli Yang, Yunchu Hu, Renrui Sun, Wenlei Wang, Kehui Xue, Ren He, Juntao Wang, Ting Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Metals and Alloys Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Hydrothermal circulation 0104 chemical sciences chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Mechanics of Materials Oxidizing agent Materials Chemistry Photocatalysis Hydroxyl radical Irradiation 0210 nano-technology Photodegradation |
| Zdroj: | Journal of Alloys and Compounds. 818:152873 |
| ISSN: | 0925-8388 |
| Popis: | Novel Z-scheme In2S3-MxInySz (M = Bi or La) heterojunction composites were fabricated through a hydrothermal method. An electron beam irradiation technology has been served for artificially creating interface defects on the composites to further enhance photocatalytic activity. SEM and TEM results showed that In2S3-MxInySz composites presented tubular structures composed of randomly assembled ultrathin nanosheets with the incorporation of Bi and La. XRD, FT-IR and XPS results proved that the as-synthesized heterostructure composites were mainly InBiS3 and InLa3S6. The In2S3-MxInySz composites presented distinct optical absorption property in visible lights region and exhibited highly enhanced photocatalytic efficiency for the removal of azo dyes and Cr(VI). Specifically, ISB-60 irradiated by electron beam displayed the best removal efficiency for the water pollutants. PL, DRS and EIS measurements showed that electron beam irradiation could reduce the recombination rate of photoexcited electron-hole pair, resulting in great separation rate of charge carriers. The ESR results confirmed the existence of superoxide radical (•O2−), hole (h+) and hydroxyl radical (•OH) in the photocatalysis process. The •O2− and h+ species possessed a significant oxidizing effect towards the photodegradation of azo dyes and the photoreduction of Cr(VI). The possible transformation pathway for the removal of water pollutants by In2S3-MxInySz (M = Bi or La) composites was proposed by means of GC-MS. |
| Databáze: | OpenAIRE |
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