کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6581391 456337 2016 61 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Well-dispersed nebula-like ZnO/CeO2@HNTs heterostructure for efficient photocatalytic degradation of tetracycline
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Well-dispersed nebula-like ZnO/CeO2@HNTs heterostructure for efficient photocatalytic degradation of tetracycline
چکیده انگلیسی
A series of nebula-like ZnO/CeO2@HNTs heterostructure photocatalysts were synthesized via a novel one-step wet-calcination method for degradation of tetracycline (TC) under simulated solar irradiation. TEM, HRTEM, XRD, FT-IR, XPS, DRS, PL, PC, EIS and ESR techniques were applied for characterization of samples. And the potential structure of new photodegradation products was studied by HPLC-MS analysis. The characterization results revealed the enhanced photocatalytic activity of ZnO/CeO2@HNTs heterostructure photocatalysts due to the delayed recombination of photogenerated electron-hole pairs. Moreover, surface oxidation state analysis demonstrates that Ce3+ and Ce4+ states coexist in CeO2, which enhance the separation of electron-hole pairs though cerium oxide shifting between CeO2 and Ce2O3 under photocatalytic process. In addition, the effects of the calcinating temperature, the molar ratio of ZnO to CeO2 and the dosage of HNTs on photocatalytic activity of ZnO/CeO2@HNTs heterostructure photocatalysts were researched and the best possible values have been found. Furthermore, the photodegradation mechanism was systematically investigated by active species trapping experiment. It revealed that OH radicals play a little role while hole and O2− are the more major reactive species in the photodegradation process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 304, 15 November 2016, Pages 917-933
نویسندگان
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