کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5350442 | 1503553 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photoinduced formation of reactive oxygen species and electrons from metal oxide-silica nanocomposite: An EPR spin-trapping study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Metal oxide nanocomposites with photocatalytic activity have the potential for many applications in environmental remediation and biomedicine. In this study, we investigated the formation and stabilization of electrons/holes from three metal oxide-silica nanocomposites (CuO-SiO2, Fe2O3-SiO2 and ZnO-SiO2) under irradiation by electron paramagnetic resonance (EPR) technology. The characteristic EPR signals with g = 2.00070-2.00105, ÎHp-p = 2.17-2.37 G were determined, which corresponded to lattice-trapped electrons. Moreover, the generation of active species from CuO-SiO2, Fe2O3-SiO2 and ZnO-SiO2 in aqueous solution under irradiation was also systematically studied. The results showed that all the three nanocomposites could generate hydroxyl radical, singlet oxygen and electron. CuO-SiO2 was more effective than Fe2O3-SiO2 and ZnO-SiO2 in producing hydroxyl radical and electrons, while ZnO-SiO2 was the most efficient in generating singlet oxygen. In addition, CuO-SiO2 exhibited most obviously photocatalytic activity toward degradation of bisphenol A, followed by Fe2O3-SiO2 and ZnO-SiO2. These findings will provide vital insights into photocatalytic mechanisms and potentially photoinduced toxicity of metal oxide-silica nanocomposites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 416, 15 September 2017, Pages 281-287
Journal: Applied Surface Science - Volume 416, 15 September 2017, Pages 281-287
نویسندگان
Hongxia Zhao, Xiuying Chen, Xintong Li, Chen Shen, Baocheng Qu, Jingsuo Gao, Jingwen Chen, Xie Quan,