多核yolk?shell型Co3O4@mSiO2纳米反应器降解双酚A

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摘要采用阳离子表面活性剂协助的自模板法合成了中空介孔SiO₂微球（HMSS），然后向含HMSS的悬浮液中加入醋酸钴溶液和氨水，让两种溶液经HMSS表面介孔进入空腔中反应生成Co₃O₄内核，合成了多核yolk-shell型Co₃O₄@mSiO₂（介孔SiO₂）纳米反应器.结合XRD、XPS、SEM、STEM、BET等手段，分析了纳米反应器的形貌、结构、元素形态和比表面积.结果显示纳米反应器均匀分散，粒径约为300nm，表面布满介孔，内部分布大量Co₃O₄纳米粒子，拥有极大的比表面积161m²/g，远大于Co₃O₄纳米粒子的比表面积35m²/g，能有效吸附双酚A（BPA），1h吸附容量达12.7mg/g.多核yolk-shell型Co₃O₄@mSiO₂纳米反应器能高效催化过一硫酸氢盐（PMS）降解BPA，2h降解率达81.8%，远高于Co₃O₄纳米粒子的降解率51.3%，同时能节省PMS的投加量，避免水中盐度过高.此外，合成的纳米反应器具有很好的再利用性，在pH值3~9范围内表现出稳定而高效的催化性能.

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	吉芳英
	王攀峤
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关键词 ：纳米反应器, 硫酸根自由基, 蛋黄-蛋壳, 四氧化三钴, 中空介孔硅球

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.

Key words： nanoreactor sulfate radical yolk-shell Co₃O₄ hollow mesoporous SiO₂ microspheres

收稿日期: 2017-11-03

X505

基金资助:国家自然科学基金资助项目（51508056）

作者简介: 吉芳英(1964-),女,重庆人,教授,博士,主要从事水污染控制理论与技术、环境规划与管理、环境质量评价等方向的研究.发表论文50余篇.

引用本文:

吉芳英, 王攀峤, 陈晴空. 多核yolk?shell型Co₃O₄@mSiO₂纳米反应器降解双酚A[J]. 中国环境科学, 2018, 38(6): 2124-2134. JI Fang-ying, WANG Pan-qiao, CHEN Qing-kong. Mesoporous multi yolk-shell@mSiO₂ nanoreactor for BPA degradation. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2124-2134.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2018/V38/I6/2124

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