کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6581384 | 456337 | 2016 | 45 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
LaCoO3 perovskite oxide activation of peroxymonosulfate for aqueous 2-phenyl-5-sulfobenzimidazole degradation: Effect of synthetic method and the reaction mechanism
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The degradations of aqueous solutions of 2-phenyl-5-sulfobenzimidazole acid (PBSA) using peroxymonosulfate (PMS) activated with LaCoO3 (LCO)-based perovskite oxides prepared by three different methods (including normal precipitate method named as LCO, introduction of cetyltrimethyl ammonium bromide (CTAB) named as LCO-CTAB and hydrothermal method with the adding of silicon named as LCO-SiO2) were investigated. The results showed that all the catalysts effectively degraded PBSA. At neutral pH, a removal efficiency of about 100% was achieved in less than 10Â min. LCO-SiO2 showed the widest solution pH range (4.0-8.0) with a lowest leaching of cobalt and lanthanum ions (both less than 5.0%). The surface and structural properties of the catalysts were determined using X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, and X-ray photoelectron spectroscopy. The reaction involved LCO and LCO-CTAB was a combination reaction including homogeneous and heterogeneous reactions. The first one was caused by the leached cobalt ions; the later one was derived by the surface cobalt-oxygen bond. In the process of LCO-SiO2 activated PMS, the heterogeneous activation reaction dominated PBSA degradation, which was derived by SO4â and electronic transfer confirmed by the effect of radical quenchers and intermediates identification. Eight intermediates generated from PBSA degradation were identified using gas chromatography-mass spectrometry. The identification of HO3SOâ among the products confirmed the proposed SO4â degradation mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 304, 15 November 2016, Pages 897-907
Journal: Chemical Engineering Journal - Volume 304, 15 November 2016, Pages 897-907
نویسندگان
Xintong Pang, Yang Guo, Yuting Zhang, Bingbing Xu, Fei Qi,