Spatial Confinement of a Co3O4 Catalyst in Hollow Metal鈥揙rganic Frameworks as a Nanoreactor for Improved Degradation of Organic Pollutants

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• 作者：Tao Zeng ; Xiaole Zhang ; Saihua Wang ; Hongyun Niu ; Yaqi Cai
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：February 17, 2015
• 年：2015
• 卷：49
• 期：4
• 页码：2350-2357
• 全文大小：428K
• ISSN：1520-5851

文摘

We here first proposed a yolk鈥搒hell Co₃O₄@metal鈥搊rganic frameworks (MOFs) nanoreactor via a facile method to accommodate sulfate radical-based advanced oxidation processes (SR-AOPs) into its interior cavity. The mesoporous and adsorptive MOFs shells allow the rapid diffusion of reactant molecules to the encapsulated Co₃O₄ active sites, and the confined high instantaneous concentration of reactants in the local void space is anticipated to facilitate the SR-AOPs. As a proof of concept, the nanoreactor was fully characterized and applied for catalytic degradation of 4-chlorophenol (4-CP) in the presence of peroxymonosulfate (PMS). The enhancement of SR-AOPs in the nanoreactor is demonstrated by the result that degradation efficiency of 4-CP reached almost 100% within 60 min by using the yolk鈥搒hell Co₃O₄@MOFs catalysts as compared to only 59.6% under the same conditions for bare Co₃O₄ NPs. Furthermore, the applicability of this nanoreactor used in SR-AOPs was systematically investigated in terms of effect of reaction parameters and identification of intermediates and primary radical as well as mineralization of the reaction and stability of the composite. The findings of this study elucidated a new opportunity for improved environmental remediation.