کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
606512 1454526 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Au@Cu2O stellated polytope with core–shelled nanostructure for high-performance adsorption and visible-light-driven photodegradation of cationic and anionic dyes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Au@Cu2O stellated polytope with core–shelled nanostructure for high-performance adsorption and visible-light-driven photodegradation of cationic and anionic dyes
چکیده انگلیسی

Au nanoparticles were covered by Cu2O nanoparticles shell and then Au@Cu2O stellated polytope was synthesized by a facile aqueous solution approach. The samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction patterns, X-ray photoelectron spectroscopy, Brunner–Emmet–Teller measurements, and Ultraviolet–visible spectroscopy analysis. With good aqueous dispersibility, surface positive charge, and high chemisorption capacity, Au@Cu2O could be used for anionic dyes removal. Compared with Degussa P25-TiO2, the adsorption of anionic dyes (acid violet 43 or methyl blue, 5.0 mg L−1) onto Au@Cu2O was increased by 90.12% and 50.8%, respectively. The photodegradation activity of methyl orange and methyl violet were in the declining order: Au@Cu2O > Cu2O–Au nanocomposites > Cu2O > P25-TiO2. The synergistic effect of coupling Au core with Cu2O shell on the dyes photodegradation was observed. The photoexcited electrons from Cu2O conduction band could be captured by Au nanoparticles, resulting in an improved electron–hole separation. Moreover, a Schottky barrier was assumed to form at the Cu2O–Au interface and Au NPs as electron sink could reduce the recombination of photoinduced electrons and holes, facilitating the photocatalytic interface reaction. The geometry of core–shell and stellated polytope is effective in the design of Cu2O–Au nanocomposites for adsorption and photocatalysis.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 469, 1 May 2016, Pages 138–146
نویسندگان
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