Synthesis of orange-like Fe3O4/PPy composite microspheres and their excellent Cr(VI) ion removal properties
Synthesis of orange-like Fe3O4/PPy composite microspheres and their excellent Cr(VI) ion removal properties
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DOI：
10.1039/c2jm30440f
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发表时间：
2012-04
影响因子：
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通讯作者：
Yongqiang Wang;Bingfang Zou;T. Gao;Xiaoping Wu;Shiyun Lou;Shaomin Zhou
中科院分区：
文献类型：
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作者：
Yongqiang Wang;Bingfang Zou;T. Gao;Xiaoping Wu;Shiyun Lou;Shaomin Zhou
以 Fe3O4 微球为化学模板，在超声处理下合成了均匀的橙色 Fe3O4/聚吡咯 (PPy) 复合微球。在橙色状Fe3O4/PPy复合微球中，Fe3O4颗粒起到“种子”的作用，而PPy则起到“果肉和果皮”的作用。提出了一种类橙色Fe3O4/PPy复合微球的生长机理：在超声处理下，部分吡咯单体浸入Fe3O4微球的间隙中，同时酸性环境下Fe3O4微球释放出的Fe3+离子引发Fe3O4微球内部或周围吡咯单体的聚合，最终形成类橙色结构。当用作Cr(VI)离子吸附剂时，所得Fe3O4/PPy微球表现出很强的吸附能力，吸附容量约为209.2 mg g−1，这主要归因于PPy的“浆果皮”。此外，复合微球中的磁性 Fe3O4“种子”使其易于通过磁力分离与废水分离。
Uniform orange-like Fe3O4/polypyrrole (PPy) composite microspheres have been synthesized using Fe3O4 microspheres as a chemical template under sonication. In the orange-like Fe3O4/PPy composite microspheres, the Fe3O4 particles played the role of “seeds” while the PPy was the “pulp and peel”. A growth mechanism for the orange-like Fe3O4/PPy composite microspheres was proposed in which partial pyrrole monomers are immersed into the gaps of Fe3O4 microspheres under sonication, meanwhile Fe3+ ions released from Fe3O4 microspheres in an acidic environment initiated the polymerization of pyrrole monomers in the interior or around the Fe3O4 microspheres, finally forming an orange-like structure. When used as an absorbent of Cr(VI) ions, the as-obtained Fe3O4/PPy microspheres showed strong adsorption capability with an adsorption capacity of about 209.2 mg g−1, which is mainly attributed to the PPy “pulp and peel”. Furthermore, the magnetic Fe3O4 “seeds” in composite microspheres make them easy to separate from wastewater by magnetic separation.