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Mesoporous multi yolk-shell@mSiO2 nanoreactor for BPA degradation |
JI Fang-ying1, WANG Pan-qiao1, CHEN Qing-kong2 |
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Chongqing 400045, China; 2. Engineering Laboratory of Environmental & Hydraulic Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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Abstract In this study, a kind of multi yolk-shell Co3O4@mSiO2 (mesoporous SiO2) nanoreactor was synthesized. Cationic surfactant assisted self-template method was used to synthesize hollow mesoporous SiO2 microspheres (HMSS). Then cobalt acetate and ammonia solution were introduced into the cavity through mesoporous to form Co3O4 core. XRD, XPS, SEM, STEM, BET analysis were combined to characterize the structure, element valences, specific surface area and morphology of the synthesized nanoreactor, which showed the nanoreactor was evenly dispersed with about 300nm particle diameter. The surface of the nanoreactor was full of mesoporous, and a large number of Co3O4 particles distributed in its hollow space. Large specific surface area of 161m2/g was demonstrated, which was apparently higher than Co3O4 nanoparticle with 35m2/g specific surface area. The adsorption capacity of BPA by multi yolk-shell Co3O4@mSiO2 nanoreactor was 12.7mg/g within 1h. Peroxymonosulfate (PMS) was catalyzed to degrade 81.8% of BPA within 2h, which was apparently higher than Co3O4 nanoparticle with 51.3% degradation rate. Dosage of PMS was saved by using the nanoreactor, and it could avoid high salinity in water. Furthermore, the nanoreactor was well recyclable, as well as performed to be highly efficient and stable in the pH range of 3~9.
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Received: 03 November 2017
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Corresponding Authors:
陈晴空,副教授,chenqingkong@cqjtu.edu.cn
E-mail: chenqingkong@cqjtu.edu.cn
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