Magnetic core-shell ZnFe₂O₄/ZnS nanocomposites for photocatalytic application under visible light

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• 作者：Pil Sun Yoo^a ; D. Amaranatha Reddy^a ; YueFa Jia^a ; Sang Eun Bae^b ; Seong Huh^b ; Chunli Liu^a ; ^{chunliliu@hufs.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ZnFe2O4 ; ZnS ; Core-shell ; Magnetically retrievable photocatalyst
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：486
• 期：Complete
• 页码：136-143
• 全文大小：2390 K

文摘

Magnetic core-shell ZnFe₂O₄/ZnS composites were synthesized through a two-step chemical process including the hydrothermal and the co-precipitation methods. The structural characterization revealed that the composites consisted of a layer of ZnS clusters on the surface of ZnFe₂O₄ nanoparticles. The band gap energy of the composite was estimated to be 2.2 eV through the Kubelka–Munk plot, implying the possible application as a photocatalyst under the visible light radiation. The improved photocatalytic efficiency of the ZnFe₂O₄/ZnS composites was confirmed through the photocatalytic degradation of Methyl Orange. The increased absorption of the visible light and the enhanced separation of the electron-hole pairs due to the relative energy band positions in ZnFe₂O₄ and ZnS are considered as the main advantages. Additionally, the moderate magnetization of the ZnFe₂O₄ core insured the easy magnetic collection of the composite materials without affecting the photocatalytic performance. Our results showed that ZnFe₂O₄-based nanocomposites could be used as an effective and magnetic retrievable photocatalyst.